// returns a view matrix using the opengl lookAt style. COLUMN ORDER.
void GLCamera::look_at(const vector3& pos, vector3 targ_pos, const vector3& up_v) {
this->cam_pos = pos;
// inverse translation
matriz4x4 p = identity_mat4();
p = p.translate(vector3(-pos.v[0], -pos.v[1], -pos.v[2]));
// distance vector
vector3 d = targ_pos - pos;
// forward vector
vector3 f = d.normalise();
// right vector
vector3 r = cross(f, up_v).normalise();
// real up vector
vector3 u = cross(r, f).normalise();
matriz4x4 ori = identity_mat4();
ori.m[0] = r.v[0];
ori.m[4] = r.v[1];
ori.m[8] = r.v[2];
ori.m[1] = u.v[0];
ori.m[5] = u.v[1];
ori.m[9] = u.v[2];
ori.m[2] = -f.v[0];
ori.m[6] = -f.v[1];
ori.m[10] = -f.v[2];
R = ori;
T = p;
view_mat = R * T;
// recalc axes to suit new orientation
mat4_to_quat(quaternion, R.m);
fwd = R * vector4(0.0, 0.0, -1.0, 0.0);
rgt = R * vector4(1.0, 0.0, 0.0, 0.0);
up = R * vector4(0.0, 1.0, 0.0, 0.0);
}
void createShaders(GLuint shader_programme) {
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
mat4 R = rotate_z_deg (identity_mat4 (), -cam_zaw);
mat4 view_mat = T * R;
view_mat_location = glGetUniformLocation (shader_programme, "view");
glUseProgram (shader_programme);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
proj_mat_location = glGetUniformLocation (shader_programme, "proj");
glUseProgram (shader_programme);
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, proj_mat);
}
// Maintain translations and rotations.
inline void updateView() {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2])); // cam translation
mat4 R = rotate_z_deg(identity_mat4(), -cam_zaw)
* rotate_y_deg(identity_mat4(), -cam_yaw)
* rotate_x_deg(identity_mat4(), -cam_xaw);
mat4 view_mat = T * R;
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
}
Camera::Camera(int view_mat_location, int proj_mat_location) {
this->view_mat_location = view_mat_location;
this->proj_mat_location = proj_mat_location;
cam_pos = vec3 (0.0f, 0.0f, 5.0f);
near = 0.1f; // clipping plane
far = 100.0f; // clipping plane
fovy = 67.0f; // 67 degrees
// aspect ratio
aspect = (float)g_gl_width / (float)g_gl_height;
proj_mat = perspective (fovy, aspect, near, far);
cam_speed = 5.0f; // 1 unit per second
cam_heading_speed = 100.0f; // 30 degrees per second
cam_heading = 0.0f; // y-rotation in degrees
T = translate (
identity_mat4 (), vec3 (-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2])
);
create_versor (quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
// convert the quaternion to a rotation matrix (just an array of 16 floats)
quat_to_mat4 (R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
fwd = FORWARD;
rgt = RIGHT;
up = UP;
set_view();
set_proj();
reset_control();
}
Mesh::Mesh(const std::string filename, std::shared_ptr<Texture> tex) :
vp(NULL), vn(NULL), vt(NULL), point_count(0), model(identity_mat4()), model_uniform(), vao(0), loaded(true), texture(tex)
{
load_obj_file(filename.c_str(), vp, vt, vn, point_count);
build();
}
GLCamera::GLCamera(float aspect)
{
near = 0.1f;
far = 100.0f;
fovy = 67.0f;
//aspect = (float)g_gl_width / (float)g_gl_height;
this->aspect = aspect;
proj_mat = perspective(fovy, this->aspect, near, far);
cam_speed = 5.0f;
cam_heading_speed = 100.0f;
cam_heading = 0.0f;
cam_pos = vector3(0.0f, 0.0f, 5.0f);
T = identity_mat4().translate( vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]) );
create_versor(quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
quat_to_mat4(R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
// keep track of some useful vectors that can be used for keyboard movement
fwd = vector4(0.0f, 0.0f, -1.0f, 0.0f);
rgt = vector4(1.0f, 0.0f, 0.0f, 0.0f);
up = vector4(0.0f, 1.0f, 0.0f, 0.0f);
cam_yaw = 0.0f; // y-rotation in degrees
cam_pitch = 0.0f;
cam_roll = 0.0;
}
void Camera::CreateViewMat()
{
translation=translate(identity_mat4(), vec3(-position.v[0], -position.v[1], -position.v[2]));
CreateVersor(quaternion, -pitch, 0.0f, 1.0f, 0.0f);
QuatToMat4(rotation.m, quaternion);
viewMat=rotation*translation;
}
void GLCamera::setPosition(vector3 pos)
{
this->cam_pos = pos;
T = identity_mat4().translate(vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]));
T = identity_mat4().translate( vector3(-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]) );
create_versor(quaternion, -cam_heading, 0.0f, 1.0f, 0.0f);
quat_to_mat4(R.m, quaternion);
// combine the inverse rotation and transformation to make a view matrix
view_mat = R * T;
// keep track of some useful vectors that can be used for keyboard movement
fwd = vector4(0.0f, 0.0f, -1.0f, 0.0f);
rgt = vector4(1.0f, 0.0f, 0.0f, 0.0f);
up = vector4(0.0f, 1.0f, 0.0f, 0.0f);
cam_yaw = 0.0f; // y-rotation in degrees
cam_pitch = 0.0f;
cam_roll = 0.0;
}
void meshInit(Mesh* mesh, GLfloat* proj_mat){
/** load memory etc. */
assert(meshLoadMeshFile(MESH_FILE, &mesh->vao, &mesh->vertexCount));
meshLoadTexture(mesh);
meshLoadShaderProgram(mesh);
glUseProgram(mesh->shader);
meshGetUniforms(mesh);
//set initial shader conditions
glUniform4f(mesh->location_clip_plane, 0.0f, -1.0f, 0.0f, 1.0f);
glUniformMatrix4fv(mesh->location_projection_mat , 1, GL_FALSE, proj_mat);
mat4 s = scale(identity_mat4(), vec3(10,10,10));
mesh->modelMatrix = s;
glUniformMatrix4fv(mesh->location_model_mat , 1, GL_FALSE, mesh->modelMatrix.m);
}
void Camera::update() {
// update view matrix
if (cam_moved) {
quat_to_mat4 (R.m, quaternion);
// checking for fp errors
// printf ("dot fwd . up %f\n", dot (fwd, up));
// printf ("dot rgt . up %f\n", dot (rgt, up));
// printf ("dot fwd . rgt\n %f", dot (fwd, rgt));
cam_pos += vec3 (fwd) * -move.v[2];
cam_pos += vec3 (up) * move.v[1];
cam_pos += vec3 (rgt) * move.v[0];
T = translate (identity_mat4 (), vec3 (cam_pos));
view_mat = inverse (R) * inverse (T);
set_view();
}
}
void GLCamera::updatePosition(vector3 move)
{
quat_to_mat4(R.m, quaternion);
// checking for fp errors
// printf ("dot fwd . up %f\n", dot (fwd, up));
// printf ("dot rgt . up %f\n", dot (rgt, up));
// printf ("dot fwd . rgt\n %f", dot (fwd, rgt));
cam_pos = cam_pos + vector3(fwd) * -move.v[2];
cam_pos = cam_pos + vector3(up) * move.v[1];
cam_pos = cam_pos + vector3(rgt) * move.v[0];
matriz4x4 T = identity_mat4().translate(vector3(cam_pos));
view_mat = R.inverse() * T.inverse();
cam_yaw = 0.0f;
cam_pitch = 0.0f;
cam_roll = 0.0;
}
int main () {
/* initialise GL context and window */
assert (restart_gl_log ());
assert (start_gl ());
/* initialise framebuffer and G-buffer */
assert (init_fb ());
/* load pre-pass shaders that write to the g-buffer */
g_first_pass_sp = create_programme_from_files (
FIRST_PASS_VS, FIRST_PASS_FS);
g_first_pass_P_loc = glGetUniformLocation (g_first_pass_sp, "P");
g_first_pass_V_loc = glGetUniformLocation (g_first_pass_sp, "V");
g_first_pass_M_loc = glGetUniformLocation (g_first_pass_sp, "M");
/* load screen-space pass shaders that read from the g-buffer */
g_second_pass_sp = create_programme_from_files (
SECOND_PASS_VS, SECOND_PASS_FS);
g_second_pass_P_loc = glGetUniformLocation (g_second_pass_sp, "P");
g_second_pass_V_loc = glGetUniformLocation (g_second_pass_sp, "V");
g_second_pass_M_loc = glGetUniformLocation (g_second_pass_sp, "M");
g_second_pass_L_p_loc = glGetUniformLocation (g_second_pass_sp, "lp");
g_second_pass_L_d_loc = glGetUniformLocation (g_second_pass_sp, "ld");
g_second_pass_L_s_loc = glGetUniformLocation (g_second_pass_sp, "ls");
g_second_pass_p_tex_loc = glGetUniformLocation (g_second_pass_sp, "p_tex");
g_second_pass_n_tex_loc = glGetUniformLocation (g_second_pass_sp, "n_tex");
glUseProgram (g_second_pass_sp);
glUniform1i (g_second_pass_p_tex_loc, 0);
glUniform1i (g_second_pass_n_tex_loc, 1);
/* object positions and matrices */
assert (load_plane ());
g_plane_M = scale (identity_mat4 (), vec3 (200.0f, 1.0f, 200.0f));
g_plane_M = translate (g_plane_M, vec3 (0.0f, -2.0f, 0.0f));
/* load sphere mesh */
assert (load_sphere ());
/* light positions and matrices */
for (int i = 0; i < NUM_LIGHTS; i++) {
float x = -sinf ((float)i * 0.5f) * 25.0f; // between +- 10 x
float y = 2.0f;
float z = (float)-i * 2.0f + 10.0; // 1 light every 2 meters away on z
g_L_p[i] = vec3 (x, y, z);
}
float light_radius = 10.0f;
int redi = 0;
int bluei = 1;
int greeni = 2;
for (int i = 0; i < NUM_LIGHTS; i++) {
g_L_M[i] = scale (identity_mat4 (),
vec3 (light_radius, light_radius, light_radius));
g_L_M[i] = translate (g_L_M[i], g_L_p[i]);
/* cycle different colours for each of the lights */
g_L_d[i] = vec3 (
(float)((redi + 1) / 3),
(float)((greeni + 1) / 3),
(float)((bluei + 1) / 3)
);
g_L_s[i] = vec3 (1.0, 1.0, 1.0);
redi = (redi + 1) % 3;
bluei = (bluei + 1) % 3;
greeni = (greeni + 1) % 3;
}
/* set up virtual camera */
float aspect = (float)g_gl_width / (float)g_gl_height;
float near = 0.1f;
float far = 1000.0f;
float fovy = 67.0f;
g_P = perspective (fovy, aspect, near, far);
vec3 up (0.0f, 1.0f, 0.0f);
vec3 targ_pos (0.0f, 0.0f, 0.0f);
vec3 cam_pos (0.0f, 30.0f, 30.0f);
g_V = look_at (cam_pos, targ_pos, up);
glViewport (0, 0, g_gl_width, g_gl_height);
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // GL_CCW for counter clock-wise
while (!glfwWindowShouldClose (g_window)) {
_update_fps_counter (g_window);
draw_first_pass ();
draw_second_pass ();
glfwSwapBuffers (g_window);
glfwPollEvents ();
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
}
/* close GL context and any other GLFW resources */
glfwTerminate();
return 0;
}
Mesh::Mesh(GLfloat* vpoints, GLfloat* vnormals, GLfloat* vtexture, int pt_count, std::shared_ptr<Texture> tex) :
vp(vpoints), vn(vnormals), vt(vtexture), point_count(pt_count), model(identity_mat4()), model_uniform(), vao(0), loaded(false), texture(tex)
{
build();
}
int main () {
GLFWwindow* window = NULL;
const GLubyte* renderer;
const GLubyte* version;
GLuint shader_programme;
GLuint vao;
//
// Start OpenGL using helper libraries
// --------------------------------------------------------------------------
if (!glfwInit ()) {
fprintf (stderr, "ERROR: could not start GLFW3\n");
return 1;
}
// change to 3.2 if on Apple OS X
glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint (GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint (GLFW_SAMPLES, msaa);
window = glfwCreateWindow (gl_width, gl_height, "Textured Mesh", NULL, NULL);
if (!window) {
fprintf (stderr, "ERROR: opening OS window\n");
return 1;
}
glfwMakeContextCurrent (window);
glewExperimental = GL_TRUE;
glewInit ();
/* get version info */
renderer = glGetString (GL_RENDERER); /* get renderer string */
version = glGetString (GL_VERSION); /* version as a string */
printf ("Renderer: %s\n", renderer);
printf ("OpenGL version supported %s\n", version);
int point_count = 0;
//
// Set up vertex buffers and vertex array object
// --------------------------------------------------------------------------
{
GLfloat* vp = NULL; // array of vertex points
GLfloat* vn = NULL; // array of vertex normals (we haven't used these yet)
GLfloat* vt = NULL; // array of texture coordinates (or these)
//assert (load_obj_file ("cube.obj", vp, vt, vn, point_count));
assert (load_obj_file ("monkey.obj", vp, vt, vn, point_count));
GLuint points_vbo, texcoord_vbo, normal_vbo;
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 3 * point_count,
vp, GL_STATIC_DRAW);
glGenBuffers (1, &texcoord_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 2 * point_count,
vt, GL_STATIC_DRAW);
glGenBuffers (1, &normal_vbo);
glBindBuffer (GL_ARRAY_BUFFER, normal_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 3 * point_count,
vn, GL_STATIC_DRAW);
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (1);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glVertexAttribPointer (1, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (2);
glBindBuffer (GL_ARRAY_BUFFER, normal_vbo);
glVertexAttribPointer (2, 3, GL_FLOAT, GL_FALSE, 0, NULL);
free (vp);
free (vn);
free (vt);
}
//
// Load shaders from files
// --------------------------------------------------------------------------
{
char* vertex_shader_str;
char* fragment_shader_str;
// allocate some memory to store shader strings
vertex_shader_str = (char*)malloc (81920);
fragment_shader_str = (char*)malloc (81920);
// load shader strings from text files
assert (parse_file_into_str ("teapot.vert", vertex_shader_str, 81920));
assert (parse_file_into_str ("teapot.frag", fragment_shader_str, 81920));
GLuint vs, fs;
vs = glCreateShader (GL_VERTEX_SHADER);
fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (vs, 1, (const char**)&vertex_shader_str, NULL);
glShaderSource (fs, 1, (const char**)&fragment_shader_str, NULL);
// free memory
free (vertex_shader_str);
free (fragment_shader_str);
int params = -1;
glCompileShader (vs);
glGetShaderiv (vs, GL_COMPILE_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: GL shader index %i (teapot.vert) did not compile\n", vs);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetShaderInfoLog (vs, max_length, &actual_length, log);
printf ("shader info log for GL index %u\n%s\n", vs, log);
}
glCompileShader (fs);
glGetShaderiv (fs, GL_COMPILE_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: GL shader index %i (teapot.frag) did not compile\n", fs);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetShaderInfoLog (fs, max_length, &actual_length, log);
printf ("shader info log for GL index %u\n%s\n", vs, log);
}
shader_programme = glCreateProgram ();
glAttachShader (shader_programme, fs);
glAttachShader (shader_programme, vs);
glBindAttribLocation (shader_programme, 0, "vp");
glBindAttribLocation (shader_programme, 1, "vt");
glBindAttribLocation (shader_programme, 2, "vn");
glLinkProgram (shader_programme);
glGetProgramiv (shader_programme, GL_LINK_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: could not link shader programme GL index %u\n", shader_programme);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetProgramInfoLog (shader_programme, max_length, &actual_length, log);
printf ("program info log for GL index %u\n%s\n", shader_programme, log);
}
/* TODO NOTE: you should check for errors and print logs after compiling and also linking shaders */
}
//
// Create some matrices
// --------------------------------------------------------------------------
mat4 M, V, P;
M = identity_mat4 ();//scale (identity_mat4 (), vec3 (0.05, 0.05, 0.05));
vec3 cam_pos (0.0, 5.0, 5.0);
vec3 targ_pos (0.0, 0.0, 0.0);
vec3 up = normalise (vec3 (0.0, 1.0, -1.0));
V = look_at (cam_pos, targ_pos, up);
P = perspective (67.0f, (float)gl_width / (float)gl_height, 0.1, 10.0);
int M_loc = glGetUniformLocation (shader_programme, "M");
int V_loc = glGetUniformLocation (shader_programme, "V");
int P_loc = glGetUniformLocation (shader_programme, "P");
int ol_loc = glGetUniformLocation (shader_programme, "ol_mode");
int sm_loc = glGetUniformLocation (shader_programme, "sm_shaded");
// send matrix values to shader immediately
glUseProgram (shader_programme);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glUniformMatrix4fv (V_loc, 1, GL_FALSE, V.m);
glUniformMatrix4fv (P_loc, 1, GL_FALSE, P.m);
glUniform1f (ol_loc, 0.0f);
glUniform1f (sm_loc, 0.0f);
//
// Start rendering
// --------------------------------------------------------------------------
// tell GL to only draw onto a pixel if the fragment is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glDepthFunc (GL_LESS); // depth-testing is to use a "less than" function
glEnable (GL_CULL_FACE); // enable culling of faces
glCullFace (GL_BACK);
glFrontFace (GL_CCW);
glClearColor (0.04, 0.04, 0.75, 1.0);
bool multi_pass = true;
GLuint fb, c_tex, d_tex;;
{
// fb
glGenFramebuffers (1, &fb);
glBindFramebuffer (GL_FRAMEBUFFER, fb);
glGenTextures (1, &c_tex);
glGenTextures (1, &d_tex);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, c_tex);
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, gl_width, gl_height, 0, GL_RGBA,
GL_UNSIGNED_BYTE, NULL);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
c_tex, 0);
glBindTexture (GL_TEXTURE_2D, d_tex);
glTexImage2D (GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, gl_width, gl_height, 0,
GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, NULL);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,
d_tex, 0);
glBindFramebuffer (GL_FRAMEBUFFER, 0);
}
GLuint quad_vao;
{
float quad_pts[] = {-1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0};
GLuint quad_vbo;
glGenBuffers (1, &quad_vbo);
glGenVertexArrays (1, &quad_vao);
glBindVertexArray (quad_vao);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, quad_vbo);
glBufferData (GL_ARRAY_BUFFER, 8 * sizeof (float), quad_pts, GL_STATIC_DRAW);
glVertexAttribPointer (0, 2, GL_FLOAT, GL_FALSE, 0, NULL);
}
GLuint post_sp;
{
char* vertex_shader_str;
char* fragment_shader_str;
// allocate some memory to store shader strings
vertex_shader_str = (char*)malloc (81920);
fragment_shader_str = (char*)malloc (81920);
// load shader strings from text files
assert (parse_file_into_str ("post.vert", vertex_shader_str, 81920));
assert (parse_file_into_str ("post.frag", fragment_shader_str, 81920));
GLuint vs, fs;
vs = glCreateShader (GL_VERTEX_SHADER);
fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (vs, 1, (const char**)&vertex_shader_str, NULL);
glShaderSource (fs, 1, (const char**)&fragment_shader_str, NULL);
// free memory
free (vertex_shader_str);
free (fragment_shader_str);
int params = -1;
glCompileShader (vs);
glGetShaderiv (vs, GL_COMPILE_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: GL shader index %i (post.vert) did not compile\n", vs);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetShaderInfoLog (vs, max_length, &actual_length, log);
printf ("shader info log for GL index %u\n%s\n", vs, log);
}
glCompileShader (fs);
glGetShaderiv (fs, GL_COMPILE_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: GL shader index %i (post.frag) did not compile\n", fs);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetShaderInfoLog (fs, max_length, &actual_length, log);
printf ("shader info log for GL index %u\n%s\n", vs, log);
}
post_sp = glCreateProgram ();
glAttachShader (post_sp, fs);
glAttachShader (post_sp, vs);
glBindAttribLocation (post_sp, 0, "vp");
glLinkProgram (post_sp);
glGetProgramiv (post_sp, GL_LINK_STATUS, ¶ms);
if (GL_TRUE != params) {
printf ("ERROR: could not link shader programme GL index %u\n", post_sp);
int max_length = 2048;
int actual_length = 0;
char log[2048];
glGetProgramInfoLog (post_sp, max_length, &actual_length, log);
printf ("program info log for GL index %u\n%s\n", post_sp, log);
}
}
double a = 0.0f;
double prev = glfwGetTime ();
while (!glfwWindowShouldClose (window)) {
if (multi_pass) {
glBindFramebuffer (GL_FRAMEBUFFER, fb);
}
glViewport (0, 0, gl_width, gl_height);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, 0);
double curr = glfwGetTime ();
double elapsed = curr - prev;
prev = curr;
glUseProgram (shader_programme);
glBindVertexArray (vao);
a += elapsed * 50.0f;
//float ang = (float)sin (a);
M = rotate_y_deg (identity_mat4 (), a);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glUniform1f (sm_loc, 1.0f); // smooth shaded or not (exception is flat-shaded, they might not be great
// if non-cube anyway due to scaling)
if (!multi_pass) {
glFrontFace (GL_CW);
glUniform1f (ol_loc, 1.0f);
glDrawArrays (GL_TRIANGLES, 0, point_count);
}
glFrontFace (GL_CCW);
glUniform1f (ol_loc, 0.0f);
glDrawArrays (GL_TRIANGLES, 0, point_count);
/* this just updates window events and keyboard input events (not used yet) */
if (multi_pass) {
glFlush ();
glFinish ();
glBindFramebuffer (GL_FRAMEBUFFER, 0);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, gl_width, gl_height);
glUseProgram (post_sp);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, d_tex);
glBindVertexArray (quad_vao);
glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);
}
glfwPollEvents ();
glfwSwapBuffers (window);
}
return 0;
}
int main () {
// start GL context with helper libraries
assert (glfwInit ());
/* We must specify 3.2 core if on Apple OS X -- other O/S can specify
anything here. I defined 'APPLE' in the makefile for OS X */
#ifdef APPLE
glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint (GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#endif
GLFWwindow* window = glfwCreateWindow (
g_viewport_width, g_viewport_height, "GUI Panels", NULL, NULL);
glfwSetWindowSizeCallback (window, glfw_window_size_callback);
glfwMakeContextCurrent (window);
glewExperimental = GL_TRUE;
glewInit ();
const GLubyte* renderer = glGetString (GL_RENDERER); // get renderer string
const GLubyte* version = glGetString (GL_VERSION); // version as a string
printf ("Renderer: %s\n", renderer);
printf ("OpenGL version supported %s\n", version);
// create a 2d panel. from 2 triangles = 6 xy coords.
float points[] = {
-1.0f, -1.0f,
1.0f, -1.0f,
-1.0f, 1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f
};
// for ground plane we can just re-use panel points but y is now z
GLuint vp_vbo, vao;
glGenBuffers (1, &vp_vbo);
glBindBuffer (GL_ARRAY_BUFFER, vp_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (points), points, GL_STATIC_DRAW);
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
// note: vertex buffer is already bound
glVertexAttribPointer (0, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (0);
// create a 3d camera to move in 3d so that we can tell that the panel is 2d
// keep track of some useful vectors that can be used for keyboard movement
vec4 fwd (0.0f, 0.0f, -1.0f, 0.0f);
vec4 rgt (1.0f, 0.0f, 0.0f, 0.0f);
vec4 up (0.0f, 1.0f, 0.0f, 0.0f);
vec3 cam_pos (0.0f, 1.0f, 5.0f);
mat4 T_inv = translate (identity_mat4 (), cam_pos);
// point slightly downwards to see the plane
versor quaternion = quat_from_axis_deg (0.0f, 1.0f, 0.0f, 0.0f);
mat4 R_inv = quat_to_mat4 (quaternion);
// combine the inverse rotation and transformation to make a view matrix
V = inverse (R_inv) * inverse (T_inv);
// projection matrix
P = perspective (
67.0f, (float)g_viewport_width / (float)g_viewport_height, 0.1f, 100.0f);
const float cam_speed = 3.0f; // 1 unit per second
const float cam_heading_speed = 50.0f; // 30 degrees per second
create_ground_plane_shaders ();
create_gui_shaders ();
// textures for ground plane and gui
GLuint gp_tex, gui_tex;
assert (load_texture ("tile2-diamonds256x256.png", &gp_tex));
assert (load_texture ("skulluvmap.png", &gui_tex));
// rendering defaults
glDepthFunc (GL_LESS); // set depth function but don't enable yet
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // GL_CCW for counter clock-wise
// absolute panel dimensions in pixels
const float panel_width = 256.0f;
const float panel_height = 256.0f;
glViewport (0, 0, g_viewport_width, g_viewport_height);
// start main rendering loop
while (!glfwWindowShouldClose (window)) {
// update timers
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
bool cam_moved = false;
vec3 move (0.0, 0.0, 0.0);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// draw ground plane. note: depth test is enabled here
glEnable (GL_DEPTH_TEST);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, gp_tex);
glUseProgram (gp_sp);
glBindVertexArray (vao);
glDrawArrays (GL_TRIANGLES, 0, 6);
// draw GUI panel. note: depth test is disabled here and drawn AFTER scene
glDisable (GL_DEPTH_TEST);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, gui_tex);
glUseProgram (gui_sp);
// resize panel to size in pixels
float x_scale = panel_width / g_viewport_width;
float y_scale = panel_height / g_viewport_height;
glUniform2f (gui_scale_loc, x_scale, y_scale);
glBindVertexArray (vao);
glDrawArrays (GL_TRIANGLES, 0, 6);
// update other events like input handling
glfwPollEvents ();
if (GLFW_PRESS == glfwGetKey (window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (window, 1);
}
float cam_yaw = 0.0f; // y-rotation in degrees
float cam_pitch = 0.0f;
float cam_roll = 0.0;
if (glfwGetKey (window, GLFW_KEY_A)) {
move.v[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_D)) {
move.v[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_Q)) {
move.v[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_E)) {
move.v[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_W)) {
move.v[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_S)) {
move.v[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_LEFT)) {
cam_yaw += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_yaw = quat_from_axis_deg (cam_yaw, up.v[0], up.v[1], up.v[2]);
quaternion = q_yaw * quaternion;
}
if (glfwGetKey (window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_yaw = quat_from_axis_deg (cam_yaw, up.v[0], up.v[1], up.v[2]);
quaternion = q_yaw * quaternion;
}
if (glfwGetKey (window, GLFW_KEY_UP)) {
cam_pitch += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_pitch = quat_from_axis_deg (
cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]);
quaternion = q_pitch * quaternion;
}
if (glfwGetKey (window, GLFW_KEY_DOWN)) {
cam_pitch -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_pitch = quat_from_axis_deg (
cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]);
quaternion = q_pitch * quaternion;
}
if (glfwGetKey (window, GLFW_KEY_Z)) {
cam_roll -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_roll = quat_from_axis_deg (
cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]);
quaternion = q_roll * quaternion;
}
if (glfwGetKey (window, GLFW_KEY_C)) {
cam_roll += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_roll = quat_from_axis_deg (
cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]);
quaternion = q_roll * quaternion;
}
// update view matrix
if (cam_moved) {
// re-calculate local axes so can move fwd in dir cam is pointing
R_inv = quat_to_mat4 (quaternion);
fwd = R_inv * vec4 (0.0, 0.0, -1.0, 0.0);
rgt = R_inv * vec4 (1.0, 0.0, 0.0, 0.0);
up = R_inv * vec4 (0.0, 1.0, 0.0, 0.0);
cam_pos = cam_pos + vec3 (fwd) * -move.v[2];
cam_pos = cam_pos + vec3 (up) * move.v[1];
cam_pos = cam_pos + vec3 (rgt) * move.v[0];
T_inv = translate (identity_mat4 (), cam_pos);
V = inverse (R_inv) * inverse (T_inv);
glUseProgram (gp_sp);
glUniformMatrix4fv (gp_V_loc, 1, GL_FALSE, V.m);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (window);
}
// done
glfwTerminate();
return 0;
}
| Working in clip space in 2d, you can very quickly build lots of widgety |
| graphics elements. It's also very easy to work out if the mouse is hovering |
| over one of your 2d panels |
\******************************************************************************/
#include "maths_funcs.h"
#include "stb_image.h" // Sean Barrett's image loader
#include <GL/glew.h> // include GLEW and new version of GL on Windows
#include <GLFW/glfw3.h> // GLFW helper library
#include <stdio.h>
#include <assert.h>
int g_viewport_width = 640;
int g_viewport_height = 480;
// virtual camera view matrix
mat4 V = identity_mat4 ();
// virtual camera projection matrix
mat4 P = identity_mat4 ();
GLuint gp_sp; // ground plane shader programme
GLint gp_V_loc; // view matrix location in gp_sp
GLint gp_P_loc; // projection matrix location in gp_sp
GLuint gui_sp; // 2d GUI panel shader programme
GLint gui_scale_loc; // scale factors for gui shader
void create_ground_plane_shaders () {
/* here i used negative y from the buffer as the z value so that it was on
the floor but also that the 'front' was on the top side. also note how i
work out the texture coordinates, st, from the vertex point position */
const char* gp_vs_str =
"#version 410\n"
int main () {
//start logger system
assert(restart_gl_log());
hardware = {}; //must initialize window before starting gl stuff
//create our main window
assert(start_gl());
cursor = {};
cursor.vertexData = new GLfloat[36 + (3 * 6)];
setCursorCoordinates(cursor.vertexData, &cursor);
GLfloat*cursorColourData = new GLfloat[36 + (3 * 6)];
{
for (int i = 0; i < 12; ++i) {
cursorColourData[i * 3] = 0.5f;
cursorColourData[i * 3 + 1] = 0.0f;
cursorColourData[i * 3 + 2] = 0.5f;
};
for (int j = 12; j < 17; ++j) {
cursorColourData[j * 3] = 0.5f;
cursorColourData[j * 3 + 1] = 0.5f;
cursorColourData[j * 3 + 2] = 0.5f;
}
}
grid = {};
grid.numberOfLines = 100;
grid.heightValue = 0.0f;
GLfloat *gridColourData = new GLfloat[100 * 2 * 3];
{
int totalVerteces = 100 * 2;
for (int i = 0; i < totalVerteces; ++i) {
gridColourData[i * 3 ] = 0.5f;
gridColourData[i * 3 + 1] = 0.0f;
gridColourData[i * 3 + 2] = 0.5f;
}
}
//Create our gridPoints coordinates
GLfloat *gridVertexData = new GLfloat[grid.numberOfLines * 6];
{
for (int i = 0; i < grid.numberOfLines; ++i) {
//draw the lines parallel to the x axis
if (i < 50) {
gridVertexData[i * 6] = i - 25; //
gridVertexData[i * 6 + 1] = grid.heightValue;
gridVertexData[i * 6 + 2] = -100.f;
gridVertexData[i * 6 + 3] = i - 25; //
gridVertexData[i * 6 + 4] = grid.heightValue;
gridVertexData[i * 6 + 5] = 100.0f;
}
//draw the lines parallel to the z axis;
if (i >= 50) {
gridVertexData[i * 6] = -100.0f; //
gridVertexData[i * 6 + 1] = grid.heightValue;
gridVertexData[i * 6 + 2] = i - 50 - 25.0f;
gridVertexData[i * 6 + 3] = 100.0f; //
gridVertexData[i * 6 + 4] = grid.heightValue;
gridVertexData[i * 6 + 5] = i - 50 - 25.0f;
}
}
}
//create our wall items //2 triangles , 3 points each, 3 coordinate
Wall wall = {};
wall.scale = vec3(1.0f, 0, 1.0f);
wall.position = vec3(1.0f, 1.0f, 1.0f);
GLfloat *wallVertexData = new GLfloat[2 * 3 * 3];
{
wallVertexData[0] = wall.scale.v[0] * 0.5f;
wallVertexData[1] = 0.0f;
wallVertexData[2] = - wall.scale.v[2] * 0.5f;
wallVertexData[3] = -wall.scale.v[0] * 0.5f;
wallVertexData[4] = 0.0f;
wallVertexData[5] = + wall.scale.v[2] * 0.5f;
wallVertexData[6] = - wall.scale.v[0] * 0.5f;
wallVertexData[7] = 0.0f;
wallVertexData[8] = - wall.scale.v[2] * 0.5f;
wallVertexData[9] = + wall.scale.v[0] * 0.5f;
wallVertexData[10] = 0.0f;
wallVertexData[11] = - wall.scale.v[2] * 0.5f;
wallVertexData[12] = + wall.scale.v[0] * 0.5f;
wallVertexData[13] = 0.0f;
wallVertexData[14] = + wall.scale.v[2] * 0.5f;
wallVertexData[15] = - wall.scale.v[0] * 0.5f;
wallVertexData[16] = 0.0f;
wallVertexData[17] = + wall.scale.v[2] * 0.5f;
}
GLfloat *wallColourData = new GLfloat[2 * 3 * 3];
{
for (int i = 0; i < 6; ++i) {
wallColourData[i * 3 + 0] = 0.8f;
wallColourData[i * 3 + 1] = 0.8f;
wallColourData[i * 3 + 2] = 0.8f;
}
}
glfwSetCursorPosCallback(hardware.window,cursor_position_callback);
glfwSetInputMode(hardware.window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
glfwSetKeyCallback(hardware.window, key_callback);
glfwSetInputMode(hardware.window,GLFW_STICKY_KEYS, 1);
GLuint shader_program = create_programme_from_files(VERTEX_SHADER, FRAGMENT_SHADER);
/* get version info */
glEnable (GL_DEPTH_TEST); /* enable depth-testing */
glDepthFunc (GL_LESS);
createVertexBufferObject(&wallColourVbo, 3 * 3 * 2 * sizeof(GLfloat), wallColourData);
createVertexBufferObject(&wallVertexVbo, 3 * 3 * 2 * sizeof(GLfloat), wallVertexData);
createVertexBufferObject(&grid.vertexVbo, grid.numberOfLines * 6 * sizeof(GLfloat), gridVertexData);
createVertexBufferObject(&grid.colourVbo, grid.numberOfLines * 6 * sizeof(GLfloat), gridColourData);
createVertexBufferObject(&cursor.vertexVbo, (36 + (3 * 6)) * sizeof(GLfloat), cursor.vertexData);
createVertexBufferObject(&cursor.colourVbo, (36 + (3 * 6)) * sizeof(GLfloat), cursorColourData);
createVertexArrayObjet(&wallVao, &wallVertexVbo, 3);
createVertexArrayObjet(&grid.vao, &grid.vertexVbo, 3);
createVertexArrayObjet(&cursor.vao, &cursor.vertexVbo, 3);
cursor.colourAttributeIndex = 1;
grid.colourAttributeIndex = 1;
wallColourAttributeIndex = 1;
setColourMesh(&cursor.vao, &cursor.colourVbo, 3, &cursor.colourAttributeIndex);
setColourMesh(&grid.vao, &grid.colourVbo, 3, &grid.colourAttributeIndex);
setColourMesh(&wallVao, &wallColourVbo, 3, &wallColourAttributeIndex);
free(cursor.vertexData);
free(cursorColourData);
free(wallVertexData);
free(wallColourData);
// camera stuff
#define PI 3.14159265359
#define DEG_TO_RAD (2.0 * PI) / 360.0
float near = 0.1f;
float far = 100.0f;
double fov = 67.0f * DEG_TO_RAD;
float aspect = (float)hardware.vmode->width /(float)hardware.vmode->height;
// matrix components
double range = tan (fov * 0.5f) * near;
double Sx = (2.0f * near) / (range * aspect + range * aspect);
double Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
camera = {};
//create view matrix
camera.pos[0] = 0.0f; // don't start at zero, or we will be too close
camera.pos[1] = 0.0f; // don't start at zero, or we will be too close
camera.pos[2] = 0.5f; // don't start at zero, or we will be too close
camera.T = translate (identity_mat4 (), vec3 (-camera.pos[0], -camera.pos[1], -camera.pos[2]));
camera.Rpitch = rotate_y_deg (identity_mat4 (), -camera.yaw);
camera.Ryaw = rotate_y_deg (identity_mat4 (), -camera.yaw);
camera.viewMatrix = camera.Rpitch * camera.T;
cursor.yaw = cursor.roll = cursor.pitch += 0.0f;
calculateCursorRotations(&cursor);
//create the viewmatrix of the wall
wall.T= translate (identity_mat4 (), vec3 (2.0f, 2.0f, 2.0f));
glUseProgram(shader_program);
camera.view_mat_location = glGetUniformLocation(shader_program, "view");
camera.proj_mat_location = glGetUniformLocation(shader_program, "proj");
glUniformMatrix4fv(camera.view_mat_location, 1, GL_FALSE, camera.viewMatrix.m);
glUniformMatrix4fv(camera.proj_mat_location, 1, GL_FALSE, proj_mat);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glEnable(GL_CULL_FACE);
glCullFace(GL_FRONT);
walls.push_back(wall);
while (!glfwWindowShouldClose (hardware.window)) {
updateMovement(&camera);
calculateViewMatrices(&camera, &cursor);
//set the new view matrix @ the shader level
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport(0, 0, hardware.vmode->width, hardware.vmode->height);
glUseProgram(shader_program);
//draw the cursor
glUniformMatrix4fv(camera.view_mat_location, 1, GL_FALSE, cursor.viewMatrix.m);
glBindVertexArray(cursor.vao);
glDrawArrays(GL_TRIANGLES, 0, 18);
//draw the walls in place
//for each wall, draw it.
//get view matrix
for ( std::vector<Wall>::iterator it = walls.begin(); it != walls.end(); ++it) {
Wall tempWall = *it;
getTransformationMatrix(&tempWall);
glUniformMatrix4fv(camera.view_mat_location, 1, GL_FALSE, tempWall.transformationMatrix.m);
glBindVertexArray(wallVao);
glDrawArrays(GL_TRIANGLES, 0, 6);
}
//draw the grid
glUniformMatrix4fv(camera.view_mat_location, 1, GL_FALSE, camera.viewMatrix.m);
glBindVertexArray(grid.vao);
glDrawArrays(GL_LINES, 0, grid.numberOfLines* 2);
glfwPollEvents();
if (GLFW_PRESS == glfwGetKey(hardware.window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose(hardware.window, 1);
}
glfwSwapBuffers(hardware.window);
}
/* close GL context and any other GLFW resources */
glfwTerminate();
return 0;
}
int main () {
GLFWwindow* window = NULL;
const GLubyte* renderer;
const GLubyte* version;
GLuint shader_programme;
GLuint vao;
//
// Start OpenGL using helper libraries
// --------------------------------------------------------------------------
if (!glfwInit ()) {
fprintf (stderr, "ERROR: could not start GLFW3\n");
return 1;
}
/* change to 3.2 if on Apple OS X
glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint (GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); */
window = glfwCreateWindow (gl_width, gl_height, "Spinning Cube", NULL, NULL);
if (!window) {
fprintf (stderr, "ERROR: opening OS window\n");
return 1;
}
glfwMakeContextCurrent (window);
glewExperimental = GL_TRUE;
glewInit ();
/* get version info */
renderer = glGetString (GL_RENDERER); /* get renderer string */
version = glGetString (GL_VERSION); /* version as a string */
printf ("Renderer: %s\n", renderer);
printf ("OpenGL version supported %s\n", version);
int point_count = 0;
//
// Set up vertex buffers and vertex array object
// --------------------------------------------------------------------------
{
GLfloat* vp = NULL; // array of vertex points
GLfloat* vn = NULL; // array of vertex normals (we haven't used these yet)
GLfloat* vt = NULL; // array of texture coordinates (or these)
assert (load_obj_file ("cube.obj", vp, vt, vn, point_count));
GLuint points_vbo, texcoord_vbo;
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
// copy our points from the header file into our VBO on graphics hardware
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 3 * point_count,
vp, GL_STATIC_DRAW);
// and grab the normals
glGenBuffers (1, &texcoord_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 2 * point_count,
vt, GL_STATIC_DRAW);
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (1);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glVertexAttribPointer (1, 2, GL_FLOAT, GL_FALSE, 0, NULL);
free (vp);
free (vn);
free (vt);
}
//
// Load shaders from files
// --------------------------------------------------------------------------
{
char* vertex_shader_str;
char* fragment_shader_str;
// allocate some memory to store shader strings
vertex_shader_str = (char*)malloc (81920);
fragment_shader_str = (char*)malloc (81920);
// load shader strings from text files
assert (parse_file_into_str ("teapot.vert", vertex_shader_str, 81920));
assert (parse_file_into_str ("teapot.frag", fragment_shader_str, 81920));
GLuint vs, fs;
vs = glCreateShader (GL_VERTEX_SHADER);
fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (vs, 1, (const char**)&vertex_shader_str, NULL);
glShaderSource (fs, 1, (const char**)&fragment_shader_str, NULL);
// free memory
free (vertex_shader_str);
free (fragment_shader_str);
glCompileShader (vs);
glCompileShader (fs);
shader_programme = glCreateProgram ();
glAttachShader (shader_programme, fs);
glAttachShader (shader_programme, vs);
glLinkProgram (shader_programme);
/* TODO NOTE: you should check for errors and print logs after compiling and also linking shaders */
}
//
// Create some matrices
// --------------------------------------------------------------------------
mat4 M, V, P;
M = identity_mat4 ();//scale (identity_mat4 (), vec3 (0.05, 0.05, 0.05));
vec3 cam_pos (0.0, 0.0, 5.0);
vec3 targ_pos (0.0, 0.0, 0.0);
vec3 up (0.0, 1.0, 0.0);
V = look_at (cam_pos, targ_pos, up);
P = perspective (67.0f, (float)gl_width / (float)gl_height, 0.1, 1000.0);
int M_loc = glGetUniformLocation (shader_programme, "M");
int V_loc = glGetUniformLocation (shader_programme, "V");
int P_loc = glGetUniformLocation (shader_programme, "P");
// send matrix values to shader immediately
glUseProgram (shader_programme);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glUniformMatrix4fv (V_loc, 1, GL_FALSE, V.m);
glUniformMatrix4fv (P_loc, 1, GL_FALSE, P.m);
int dt_pixel_c = 16 * 16;
char* dt_data = (char*)malloc (4 * dt_pixel_c);
if (!dt_data) {
fprintf (stderr, "ERROR: out of memory. malloc default texture\n");
return 1;
}
for (int i = 0; i < dt_pixel_c * 4; i += 4) {
int sq_ac = i / 16;
if ((sq_ac / 2) * 2 == sq_ac) {
dt_data[i] = 0;
dt_data[i + 1] = 0;
dt_data[i + 2] = 0;
dt_data[i + 3] = (char)255;
} else {
dt_data[i] = (char)255;
dt_data[i + 1] = 0;
dt_data[i + 2] = (char)255;
dt_data[i + 3] = (char)255;
}
int sq_dn = i / (16 * 16);
if ((sq_dn / 2) * 2 == sq_dn) {
dt_data[i] = (char)255 - dt_data[i];
dt_data[i + 2] = (char)255 - dt_data[i + 2];
}
}
GLuint tex;
glGenTextures (1, &tex);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, tex);
int x,y,n;
unsigned char *data = stbi_load ("move_me.png", &x, &y, &n, 4);
if (!data) {
fprintf (stderr, "ERROR: could not load image 'move_me.png'. using default texture\n");
glTexImage2D (
GL_TEXTURE_2D,
0,
GL_RGBA,
16,
16,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
dt_data
);
} else {
glTexImage2D (
GL_TEXTURE_2D,
0,
GL_RGBA,
x,
y,
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
data
);
stbi_image_free(data);
data = NULL;
printf ("loaded image with [%i,%i] res and %i chans\n", x, y, n);
}
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
free (dt_data);
dt_data = NULL;
// */
//
// Start rendering
// --------------------------------------------------------------------------
// tell GL to only draw onto a pixel if the fragment is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glClearColor (0.01, 0.01, 0.25, 1.0);
float a = 0.0f;
double prev = glfwGetTime ();
while (!glfwWindowShouldClose (window)) {
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// just the default viewport, covering the whole render area
glViewport (0, 0, gl_width, gl_height);
double curr = glfwGetTime ();
double elapsed = curr - prev;
prev = curr;
glUseProgram (shader_programme);
glBindVertexArray (vao);
a += sinf (elapsed * 50.0f);
M = rotate_y_deg (identity_mat4 (), a);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glDrawArrays (GL_TRIANGLES, 0, point_count);
/* this just updates window events and keyboard input events (not used yet) */
glfwPollEvents ();
glfwSwapBuffers (window);
}
return 0;
}
int main () {
assert (restart_gl_log ());
assert (start_gl ());
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // set counter-clock-wise vertex order to mean the front
glClearColor (0.2, 0.2, 0.2, 1.0); // grey background to help spot mistakes
glViewport (0, 0, g_gl_width, g_gl_height);
/* load the mesh using assimp */
GLuint monkey_vao;
mat4 monkey_bone_offset_matrices[MAX_BONES];
mat4 monkey_bone_animation_mats[MAX_BONES];
for (int i = 0; i < MAX_BONES; i++) {
monkey_bone_animation_mats[i] = identity_mat4 ();
monkey_bone_offset_matrices[i] = identity_mat4 ();
monkey_bone_animation_mats[i] = identity_mat4 ();
}
int monkey_point_count = 0;
int monkey_bone_count = 0;
Skeleton_Node* monkey_root_node = NULL;
double monkey_anim_duration = 0.0;
assert (load_mesh (
MESH_FILE,
&monkey_vao,
&monkey_point_count,
monkey_bone_offset_matrices,
&monkey_bone_count,
&monkey_root_node,
&monkey_anim_duration
));
printf ("monkey bone count %i\n", monkey_bone_count);
/* create a buffer of bone positions for visualising the bones */
float bone_positions[3 * 256];
int c = 0;
for (int i = 0; i < monkey_bone_count; i++) {
//print (monkey_bone_offset_matrices[i]);
// get the x y z translation elements from the last column in the array
bone_positions[c++] = -monkey_bone_offset_matrices[i].m[12];
bone_positions[c++] = -monkey_bone_offset_matrices[i].m[13];
bone_positions[c++] = -monkey_bone_offset_matrices[i].m[14];
}
GLuint bones_vao;
glGenVertexArrays (1, &bones_vao);
glBindVertexArray (bones_vao);
GLuint bones_vbo;
glGenBuffers (1, &bones_vbo);
glBindBuffer (GL_ARRAY_BUFFER, bones_vbo);
glBufferData (
GL_ARRAY_BUFFER,
3 * monkey_bone_count * sizeof (float),
bone_positions,
GL_STATIC_DRAW
);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (0);
/*-------------------------------CREATE SHADERS-------------------------------*/
GLuint shader_programme = create_programme_from_files (
VERTEX_SHADER_FILE, FRAGMENT_SHADER_FILE
);
GLuint bones_shader_programme = create_programme_from_files (
"bones.vert", "bones.frag"
);
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
float cam_speed = 5.0f; // 1 unit per second
float cam_yaw_speed = 40.0f; // 10 degrees per second
float cam_pos[] = {0.0f, 0.0f, 5.0f}; // don't start at zero, or we will be too close
float cam_yaw = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw);
mat4 view_mat = R * T;
/* apply a model matrix that rotates our mesh up the correct way */
mat4 model_mat = identity_mat4 ();
glUseProgram (shader_programme);
int model_mat_location = glGetUniformLocation (shader_programme, "model");
glUniformMatrix4fv (model_mat_location, 1, GL_FALSE, model_mat.m);
int view_mat_location = glGetUniformLocation (shader_programme, "view");
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
int proj_mat_location = glGetUniformLocation (shader_programme, "proj");
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, proj_mat);
int bone_matrices_locations[MAX_BONES];
// reset all the bone matrices
char name[64];
for (int i = 0; i < MAX_BONES; i++) {
sprintf (name, "bone_matrices[%i]", i);
bone_matrices_locations[i] = glGetUniformLocation (shader_programme, name);
glUniformMatrix4fv (bone_matrices_locations[i], 1, GL_FALSE, identity_mat4 ().m);
}
glUseProgram (bones_shader_programme);
int bones_view_mat_location = glGetUniformLocation (bones_shader_programme, "view");
glUniformMatrix4fv (bones_view_mat_location, 1, GL_FALSE, view_mat.m);
int bones_proj_mat_location = glGetUniformLocation (bones_shader_programme, "proj");
glUniformMatrix4fv (bones_proj_mat_location, 1, GL_FALSE, proj_mat);
double anim_time = 0.0;
while (!glfwWindowShouldClose (g_window)) {
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
/* update animation timer and loop */
anim_time += elapsed_seconds * 0.5;
if (anim_time >= monkey_anim_duration) {
anim_time = monkey_anim_duration - anim_time;
}
_update_fps_counter (g_window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, g_gl_width, g_gl_height);
glEnable (GL_DEPTH_TEST);
glUseProgram (shader_programme);
glBindVertexArray (monkey_vao);
glDrawArrays (GL_TRIANGLES, 0, monkey_point_count);
glDisable (GL_DEPTH_TEST);
glEnable (GL_PROGRAM_POINT_SIZE);
glUseProgram (bones_shader_programme);
glBindVertexArray (bones_vao);
glDrawArrays (GL_POINTS, 0, monkey_bone_count);
glDisable (GL_PROGRAM_POINT_SIZE);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
if (glfwGetKey (g_window, GLFW_KEY_A)) {
cam_pos[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_D)) {
cam_pos[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_UP)) {
cam_pos[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_DOWN)) {
cam_pos[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_W)) {
cam_pos[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_S)) {
cam_pos[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_LEFT)) {
cam_yaw += cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
// update view matrix
if (cam_moved) {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2])); // cam translation
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw); //
mat4 view_mat = R * T;
glUseProgram (shader_programme);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
glUseProgram (bones_shader_programme);
glUniformMatrix4fv (bones_view_mat_location, 1, GL_FALSE, view_mat.m);
}
skeleton_animate (
monkey_root_node,
anim_time,
identity_mat4 (),
monkey_bone_offset_matrices,
monkey_bone_animation_mats
);
glUseProgram (shader_programme);
glUniformMatrix4fv (
bone_matrices_locations[0],
monkey_bone_count,
GL_FALSE,
monkey_bone_animation_mats[0].m
);
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (g_window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}
int main () {
// start GL context and O/S window using the GLFW helper library
if (!glfwInit ()) {
fprintf (stderr, "ERROR: could not start GLFW3\n");
return 1;
}
// uncomment these lines if on Apple OS X
glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint (GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow (640, 480, "Cube to Sphere", NULL, NULL);
if (!window) {
fprintf (stderr, "ERROR: could not open window with GLFW3\n");
glfwTerminate();
return 1;
}
GLFWwindow* window2 = glfwCreateWindow (640, 480, "Just checking", NULL, NULL);
if (!window2) {
fprintf (stderr, "ERROR: could not open window with GLFW3\n");
glfwTerminate();
return 1;
}
glfwMakeContextCurrent (window);
//start GLEW extension handler
glewExperimental = GL_TRUE;
glewInit ();
// get version info
const GLubyte* renderer = glGetString (GL_RENDERER); // get renderer string
const GLubyte* version = glGetString (GL_VERSION); // version as a string
printf ("Renderer: %s\n", renderer);
printf ("OpenGL version supported %s\n", version);
//CLGLUtils::init();
boost::compute::context context;
try {
context = boost::compute::opengl_create_shared_context();
} catch (std::exception e) {
std::cerr<<"Failed to initialize a CLGL context"<<e.what()<<std::endl;
exit(0);
}
// tell GL to only draw onto a pixel if the shape is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
// OTHER STUFF GOES HERE NEXT
float points[] = {
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, 1.0f
};
GLuint vbo;
glGenBuffers (1, &vbo);
glBindBuffer (GL_ARRAY_BUFFER, vbo);
glBufferData (GL_ARRAY_BUFFER, 3 * 36 * sizeof (float), &points, GL_STATIC_DRAW);
GLuint vao;
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
//Create Cube map
GLuint cube_map_texture;
create_cube_map ((resource_dir+"negz.jpg").c_str(), (resource_dir+"posz.jpg").c_str(), (resource_dir+"posy.jpg").c_str(), (resource_dir+"negy.jpg").c_str(), (resource_dir+"negx.jpg").c_str(), (resource_dir+"posx.jpg").c_str(), &cube_map_texture);
boost::shared_ptr<boost::compute::opengl_texture> cl_cube_map_texture;
try {
cl_cube_map_texture = boost::shared_ptr<boost::compute::opengl_texture>(new boost::compute::opengl_texture(context,GL_TEXTURE_2D_ARRAY,0,cube_map_texture,boost::compute::memory_object::mem_flags::read_only));
} catch ( const std::exception& e ) {
std::cerr << e.what() << std::endl;
}
const char* vertex_shader =
"#version 400\n"
"in vec3 vp;"
"uniform mat4 P, V;"
// "uniform vec3 vertOut;"
"out vec3 texcoords;"
"vec3 newP;"
"void main () {"
" texcoords = vp;"
// " vertOut = vp;"
" gl_Position = P * V * vec4 (vp, 1.0);"
"}";
const char* fragment_shader = loadShader(resource_dir+"fragmentShader.frag").c_str();
/*"#version 400\n"
"in vec3 texcoords;"
"uniform samplerCube cube_texture;"
"out vec4 frag_colour;"
"vec4 cubeToLatLon(samplerCube cubemap, vec3 inUV) {"
"vec3 cubmapTexCoords;"
//"cubmapTexCoords.x = inUV.x*sqrt(1 - ( (inUV.y * inUV.y)/2 ) - ( (inUV.z * inUV.z)/2 ) + ( ( (inUV.y * inUV.y) * (inUV.z * inUV.z))/3));"
"cubmapTexCoords.x = inUV.x;"
//"cubmapTexCoords.y= inUV.y*sqrt(1 - ( (inUV.z * inUV.z)/2 ) - ( (inUV.x * inUV.x)/2 ) + ( ( (inUV.z * inUV.z) * (inUV.x * inUV.x))/3));"
"cubmapTexCoords.y = inUV.y;"
"cubmapTexCoords.z = inUV.z*sqrt(1 - ( (inUV.x * inUV.x)/2 ) - ( (inUV.y * inUV.y)/2 ) + ( ( (inUV.x * inUV.x) * (inUV.y * inUV.y))/3));"
//"cubmapTexCoords.z = inUV.z;"
"return texture(cubemap, cubmapTexCoords);"
"}"
"void main () {"
//" frag_colour = texture (cube_texture, texcoords);"
" frag_colour = cubeToLatLon (cube_texture, texcoords);"
"}";*/
GLuint vs = glCreateShader (GL_VERTEX_SHADER);
glShaderSource (vs, 1, &vertex_shader, NULL);
glCompileShader (vs);
GLuint fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (fs, 1, &fragment_shader, NULL);
glCompileShader (fs);
GLuint cube_sp = glCreateProgram ();
glAttachShader (cube_sp, fs);
glAttachShader (cube_sp, vs);
glLinkProgram (cube_sp);
//*-----------------------------Compile Shaders for second window - square --------*/
glfwMakeContextCurrent(window2);
//start GLEW extension handler
glewExperimental = GL_TRUE;
glewInit ();
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
float squarePoints[] =
{
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f
};
GLfloat texcoords[] = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f
};
GLuint vbo_square;
glGenBuffers (1, &vbo_square);
glBindBuffer (GL_ARRAY_BUFFER, vbo_square);
glBufferData (GL_ARRAY_BUFFER, 3 * 6 * sizeof (float), &squarePoints, GL_STATIC_DRAW);
GLuint texcoords_vbo;
glGenBuffers (1, &texcoords_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoords_vbo);
glBufferData (GL_ARRAY_BUFFER, 12 * sizeof (GLfloat), texcoords, GL_STATIC_DRAW);
GLuint vao_square;
glGenVertexArrays (1, &vao_square);
glBindVertexArray (vao_square);
glBindBuffer (GL_ARRAY_BUFFER, vbo_square);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glBindBuffer (GL_ARRAY_BUFFER, texcoords_vbo);
glVertexAttribPointer (1, 2, GL_FLOAT, GL_FALSE, 0, NULL); // normalise!
glEnableVertexAttribArray (0);
glEnableVertexAttribArray (1);
GLuint square_sp = create_programme_from_files((resource_dir+"square.vert").c_str(), (resource_dir+"square.frag").c_str());
GLuint tex;
assert (load_texture ((resource_dir+"negz.jpg").c_str(), &tex));
//*----------------------------------------------------------------------------------*/
glfwMakeContextCurrent (window);
int cube_V_location = glGetUniformLocation (cube_sp, "V");
int cube_P_location = glGetUniformLocation (cube_sp, "P");
//int cube_vertOut = glGetUniformLocation (cube_sp, "vertOut");
/*-------------------------------CREATE GLOBAL CAMERA--------------------------------*/
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fovy = 80.0f; // 67 degrees
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
proj_mat = perspective (fovy, aspect, near, far);
float cam_speed = 3.0f; // 1 unit per second
float cam_heading_speed = 50.0f; // 30 degrees per second
float cam_heading = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos.v[0], -cam_pos.v[1], -cam_pos.v[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_heading);
versor q = quat_from_axis_deg (-cam_heading, 0.0f, 1.0f, 0.0f);
view_mat = R * T;
// keep track of some useful vectors that can be used for keyboard movement
vec4 fwd (0.0f, 0.0f, -1.0f, 0.0f);
vec4 rgt (1.0f, 0.0f, 0.0f, 0.0f);
vec4 up (0.0f, 1.0f, 0.0f, 0.0f);
/*---------------------------SET RENDERING DEFAULTS---------------------------*/
glUseProgram (cube_sp);
glUniformMatrix4fv (cube_V_location, 1, GL_FALSE, R.m);
glUniformMatrix4fv (cube_P_location, 1, GL_FALSE, proj_mat.m);
// unique model matrix for each sphere
mat4 model_mat = identity_mat4 ();
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // set counter-clock-wise vertex order to mean the front
glClearColor (0.2, 0.2, 0.2, 1.0); // grey background to help spot mistakes
glViewport (0, 0, g_gl_width, g_gl_height);
while (!glfwWindowShouldClose (window) && !glfwWindowShouldClose (window2)) {
// update timers
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
//_update_fps_counter (window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// render a sky-box using the cube-map texture
glDepthMask (GL_FALSE);
glUseProgram (cube_sp);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_CUBE_MAP, cube_map_texture);
glBindVertexArray (vao);
glDrawArrays (GL_TRIANGLES, 0, 36);
glDepthMask (GL_TRUE);
//*---------------------------------Display for second window-------------------*/
glfwMakeContextCurrent (window2);
glUseProgram (square_sp);
int cubemap_vert = glGetUniformLocation (square_sp, "cubeMap_texcoords");
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // set counter-clock-wise vertex order to mean the front
glClearColor (0.3, 0.2, 0.3, 1.0); // grey background to help spot mistakes
glViewport (0, 0, g_gl_width, g_gl_height);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDepthMask (GL_FALSE);
glUseProgram (square_sp);
glBindVertexArray (vao_square);
glDrawArrays (GL_TRIANGLES, 0, 6);
glDepthMask (GL_TRUE);
//*------------------------------GO back to cubemap window--------------------*/
glfwMakeContextCurrent (window);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
vec3 move (0.0, 0.0, 0.0);
float cam_yaw = 0.0f; // y-rotation in degrees
float cam_pitch = 0.0f;
float cam_roll = 0.0;
if (glfwGetKey (window, GLFW_KEY_A)) {
move.v[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
print(move);
}
if (glfwGetKey (window, GLFW_KEY_D)) {
move.v[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_Q)) {
move.v[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_E)) {
move.v[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_W)) {
move.v[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_S)) {
move.v[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (window, GLFW_KEY_LEFT)) {
cam_yaw += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_yaw = quat_from_axis_deg (
cam_yaw, up.v[0], up.v[1], up.v[2]
);
q = q_yaw * q;
}
if (glfwGetKey (window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_yaw = quat_from_axis_deg (
cam_yaw, up.v[0], up.v[1], up.v[2]
);
q = q_yaw * q;
}
if (glfwGetKey (window, GLFW_KEY_UP)) {
cam_pitch += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_pitch = quat_from_axis_deg (
cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]
);
q = q_pitch * q;
}
if (glfwGetKey (window, GLFW_KEY_DOWN)) {
cam_pitch -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_pitch = quat_from_axis_deg (
cam_pitch, rgt.v[0], rgt.v[1], rgt.v[2]
);
q = q_pitch * q;
}
if (glfwGetKey (window, GLFW_KEY_Z)) {
cam_roll -= cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_roll = quat_from_axis_deg (
cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]
);
q = q_roll * q;
}
if (glfwGetKey (window, GLFW_KEY_C)) {
cam_roll += cam_heading_speed * elapsed_seconds;
cam_moved = true;
versor q_roll = quat_from_axis_deg (
cam_roll, fwd.v[0], fwd.v[1], fwd.v[2]
);
q = q_roll * q;
}
// update view matrix
if (cam_moved) {
cam_heading += cam_yaw;
// re-calculate local axes so can move fwd in dir cam is pointing
R = quat_to_mat4 (q);
fwd = R * vec4 (0.0, 0.0, -1.0, 0.0);
rgt = R * vec4 (1.0, 0.0, 0.0, 0.0);
up = R * vec4 (0.0, 1.0, 0.0, 0.0);
cam_pos = cam_pos + vec3 (fwd) * -move.v[2];
cam_pos = cam_pos + vec3 (up) * move.v[1];
cam_pos = cam_pos + vec3 (rgt) * move.v[0];
mat4 T = translate (identity_mat4 (), vec3 (cam_pos));
view_mat = inverse (R) * inverse (T);
//std::cout<<inverse(R).m<<std::endl;
// cube-map view matrix has rotation, but not translation
glUseProgram (cube_sp);
glUniformMatrix4fv (cube_V_location, 1, GL_FALSE, inverse (R).m);
}
if (GLFW_PRESS == glfwGetKey (window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (window, 1);
}
if (GLFW_PRESS == glfwGetKey (window2, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (window2, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (window);
glfwMakeContextCurrent (window2);
glfwSwapBuffers (window2);
glfwMakeContextCurrent (window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}
void display(){
computeMatricesFromInputs();
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glClearColor (0.5f, 0.5f, 0.5f, 1.0f);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram (shaderProgramID);
//glBindTexture(GL_TEXTURE_2D, texs[1]);
glActiveTexture(GL_TEXTURE0);
glBindVertexArray(vaos[1]);
//
int matrix_location2 = glGetUniformLocation (shaderProgramID, "model");
int view_mat_location2 = glGetUniformLocation (shaderProgramID, "view");
int proj_mat_location2 = glGetUniformLocation (shaderProgramID, "proj");
int tex_loc2 = glGetUniformLocation (shaderProgramID,"basic_texture");
mat4 viewMatrix2 = getViewMatrix();
mat4 persp_proj2 = getProjectionMatrix();
mat4 model3 = identity_mat4 ();
model3 = rotate_x_deg(model3,90);
model3 = scale(model3, vec3(20,20,20));
glUniformMatrix4fv (proj_mat_location2, 1, GL_FALSE, persp_proj2.m);
glUniformMatrix4fv (view_mat_location2, 1, GL_FALSE, viewMatrix2.m);
glUniformMatrix4fv (matrix_location2, 1, GL_FALSE, model3.m);
// glBindTexture(GL_TEXTURE_2D, texs[1]);
glDrawArrays(GL_TRIANGLES,0,g_point_count2);
glBindVertexArray(vaos[2]);
int matrix_location3 = glGetUniformLocation (shaderProgramID, "model");
int view_mat_location3 = glGetUniformLocation (shaderProgramID, "view");
int proj_mat_location3 = glGetUniformLocation (shaderProgramID, "proj");
zombie = identity_mat4();
move(zombie, getPosition());
// zombie = translate(zombie, getE_Position());
//zombie = translate(zombie, vec3(0.0,-20.0, 0));
glUniformMatrix4fv (proj_mat_location3, 1, GL_FALSE, persp_proj2.m);
glUniformMatrix4fv (view_mat_location3, 1, GL_FALSE, viewMatrix2.m);
glUniformMatrix4fv(matrix_location3,1,GL_FALSE, zombie.m);
glDrawArrays(GL_TRIANGLES, 0, g_point_count3);
// ---------------------------SKYBOX----------------------------------------------------------------
glDepthMask (GL_FALSE);
glActiveTexture(GL_TEXTURE0);glBindTexture(GL_TEXTURE_CUBE_MAP, texs[0]);
glBindVertexArray(vaos[0]);
int matrix_location = glGetUniformLocation (shaderProgramID, "model");
int view_mat_location = glGetUniformLocation (shaderProgramID, "view");
int proj_mat_location = glGetUniformLocation (shaderProgramID, "proj");
int tex_loc = glGetUniformLocation (shaderProgramID,"basic_texture");
mat4 viewMatrix = getViewMatrix();
mat4 persp_proj = getProjectionMatrix();
model = identity_mat4();
model = rotate_x_deg(model, 90);
model = translate(model, getPosition());
// mat4 global = model3 * model;
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, persp_proj.m);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, viewMatrix.m);
glUniformMatrix4fv (matrix_location, 1, GL_FALSE, model.m);
glDrawArrays(GL_TRIANGLES,0,36);
// tell GL to only draw onto a pixel if the shape is closer to the viewer
glDepthMask (GL_TRUE);
//glUseProgram (shaderProgramID);
/* glBindVertexArray(vaos[1]);
//Declare your uniform variables that will be used in your shader
int matrix_location2 = glGetUniformLocation (shaderProgramID, "model");
// int tex_loc = glGetUniformLocation (shaderProgramID,"basic_texture");
glUniform1i(tex_loc,0);
mat4 model2 = identity_mat4();
model2 = scale(model2, vec3(100,100,100));
model2 = rotate_x_deg(model2, 90);
mat4 global2 = global2 * model2;
glUniformMatrix4fv(matrix_location2, 1, GL_FALSE, model2.m);
glDrawArrays(GL_TRIANGLES,0, g_point_count2); */
/*
// BOTTOM-LEFT
mat4 viewMatrix2 = getViewMatrix();
mat4 persp_proj2 = getProjectionMatrix();
mat4 model2 = identity_mat4 ();
model2 = rotate_z_deg (model, 180) * rotate_y_deg(model, 180);
model2 = scale (model2, vec3(.1,.1,.1));
mat4 global1 = model2;
// view = translate (view, vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
// glViewport (200, 150, width / 2, height / 2);
glUniformMatrix4fv (proj_mat_location2, 1, GL_FALSE, persp_proj2.m);
glUniformMatrix4fv (view_mat_location2, 1, GL_FALSE, viewMatrix2.m);
glUniformMatrix4fv (matrix_location2, 1, GL_FALSE, model2.m);
glDrawArrays (GL_TRIANGLES, 36, g_point_count3);
*/
// int matrix_location2 = glGetUniformLocation(shaderProgramID, "model");
// glDrawElements(GL_TRIANGLES, g_point_count2, GL_UNSIGNED_SHORT, &vaos[0]);
/*
glBindVertexArray(vaos[1]);
int matrix_location2 = glGetUniformLocation (shaderProgramID, "model");
int view_mat_location2 = glGetUniformLocation (shaderProgramID, "view");
int proj_mat_location2 = glGetUniformLocation (shaderProgramID, "proj");
mat4 model2 = identity_mat4 ();
model2 = rotate_x_deg (model, 180) * rotate_y_deg(model, 180);
// model2 = scale (model, vec3(5,5,5));
// view = translate (view, vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
// glViewport (200, 150, width / 2, height / 2);
glUniformMatrix4fv (matrix_location2, 1, GL_FALSE, model2.m);
// mat4 spiral = identity_mat4();
// mat4 global = model * spiral;
// glUniformMatrix4fv(matrix_location,1,GL_FALSE, global.m);
glDrawArrays(GL_TRIANGLES,g_point_count2 + 1,g_point_count3);
// glDrawElements(GL_TRIANGLES, g_point_count3, GL_UNSIGNED_SHORT, &vaos[1]);
*/
glutSwapBuffers();
}
/**
* calculate a new View Matrix
*/
static void calculateViewMatrices(Camera *camera, Cursor *cursor){
camera->T = translate (identity_mat4 (), vec3 (-camera->pos[0], -camera->pos[1], -camera->pos[2]));
camera->viewMatrix = camera->Rpitch * camera->Ryaw * camera->T;
cursor->T = translate (identity_mat4 (), vec3 (-cursor->X, +cursor->Y, -cursor->Z));
cursor->viewMatrix = camera->viewMatrix * cursor->T * cursor->Rpitch * cursor->Ryaw * cursor->Rroll ;
}
int main () {
restart_gl_log ();
start_gl ();
// tell GL to only draw onto a pixel if the shape is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
// depth-testing interprets a smaller value as "closer"
glDepthFunc (GL_LESS);
assert (load_mesh ("monkey.obj"));
GLuint vao;
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
GLuint points_vbo;
if (NULL != g_vp) {
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glBufferData (GL_ARRAY_BUFFER, 3 * g_point_count * sizeof (GLfloat), g_vp,
GL_STATIC_DRAW);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (0);
printf ("enabled points\n");
}
GLuint normals_vbo;
if (NULL != g_vn) {
glGenBuffers (1, &normals_vbo);
glBindBuffer (GL_ARRAY_BUFFER, normals_vbo);
glBufferData (GL_ARRAY_BUFFER, 3 * g_point_count * sizeof (GLfloat), g_vn,
GL_STATIC_DRAW);
glVertexAttribPointer (1, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (1);
printf ("enabled normals\n");
}
GLuint texcoords_vbo;
if (NULL != g_vt) {
glGenBuffers (1, &texcoords_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoords_vbo);
glBufferData (GL_ARRAY_BUFFER, 2 * g_point_count * sizeof (GLfloat), g_vt,
GL_STATIC_DRAW);
glVertexAttribPointer (2, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (2);
printf ("enabled texcoords\n");
}
GLuint shader_programme = create_programme_from_files ("test_vs.glsl",
"test_fs.glsl");
/* if converting to GLSL 410 do this to replace GLSL texture bindings:
GLint diffuse_map_loc, specular_map_loc, ambient_map_loc, emission_map_loc;
diffuse_map_loc = glGetUniformLocation (shader_programme, "diffuse_map");
specular_map_loc = glGetUniformLocation (shader_programme, "specular_map");
ambient_map_loc = glGetUniformLocation (shader_programme, "ambient_map");
emission_map_loc = glGetUniformLocation (shader_programme, "emission_map");
assert (diffuse_map_loc > -1);
assert (specular_map_loc > -1);
assert (ambient_map_loc > -1);
assert (emission_map_loc > -1);
glUseProgram (shader_programme);
glUniform1i (diffuse_map_loc, 0);
glUniform1i (specular_map_loc, 1);
glUniform1i (ambient_map_loc, 2);
glUniform1i (emission_map_loc, 3);*/
// load texture
GLuint tex_diff, tex_spec, tex_amb, tex_emiss;
glActiveTexture (GL_TEXTURE0);
assert (load_texture ("boulder_diff.png", &tex_diff));
glActiveTexture (GL_TEXTURE1);
assert (load_texture ("boulder_spec.png", &tex_spec));
glActiveTexture (GL_TEXTURE2);
assert (load_texture ("ao.png", &tex_amb));
glActiveTexture (GL_TEXTURE3);
assert (load_texture ("tileable9b_emiss.png", &tex_emiss));
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
float cam_speed = 1.0f; // 1 unit per second
float cam_yaw_speed = 90.0f; // 10 degrees per second
// don't start at zero, or we will be too close
float cam_pos[] = {0.0f, 0.0f, 5.0f};
float cam_yaw = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1],
-cam_pos[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw);
mat4 view_mat = R * T;
int view_mat_location = glGetUniformLocation (shader_programme, "view");
glUseProgram (shader_programme);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
int proj_mat_location = glGetUniformLocation (shader_programme, "proj");
glUseProgram (shader_programme);
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, proj_mat);
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // GL_CCW for counter clock-wise
while (!glfwWindowShouldClose (g_window)) {
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
_update_fps_counter (g_window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, g_gl_width, g_gl_height);
glUseProgram (shader_programme);
glBindVertexArray (vao);
// draw points 0-3 from the currently bound VAO with current in-use shader
glDrawArrays (GL_TRIANGLES, 0, g_point_count);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
if (glfwGetKey (g_window, GLFW_KEY_A)) {
cam_pos[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_D)) {
cam_pos[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_UP)) {
cam_pos[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_DOWN)) {
cam_pos[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_W)) {
cam_pos[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_S)) {
cam_pos[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_LEFT)) {
cam_yaw += cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
// update view matrix
if (cam_moved) {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1],
-cam_pos[2])); // cam translation
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw); //
mat4 view_mat = R * T;
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
}
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (g_window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}
void skeleton_animate (
Skeleton_Node* node,
double anim_time,
mat4 parent_mat,
mat4* bone_offset_mats,
mat4* bone_animation_mats
) {
assert (node);
/* the animation of a node after inheriting its parent's animation */
mat4 our_mat = parent_mat;
/* the animation for a particular bone at this time */
mat4 local_anim = identity_mat4 ();
mat4 node_T = identity_mat4 ();
if (node->num_pos_keys > 0) {
int prev_key = 0;
int next_key = 0;
for (int i = 0; i < node->num_pos_keys - 1; i++) {
prev_key = i;
next_key = i + 1;
if (node->pos_key_times[next_key] >= anim_time) {
break;
}
}
float total_t = node->pos_key_times[next_key] - node->pos_key_times[prev_key];
float t = (anim_time - node->pos_key_times[prev_key]) / total_t;
vec3 vi = node->pos_keys[prev_key];
vec3 vf = node->pos_keys[next_key];
vec3 lerped = vi * (1.0f - t) + vf * t;
node_T = translate (identity_mat4 (), lerped);
}
mat4 node_R = identity_mat4 ();
if (node->num_rot_keys > 0) {
// find next and previous keys
int prev_key = 0;
int next_key = 0;
for (int i = 0; i < node->num_rot_keys - 1; i++) {
prev_key = i;
next_key = i + 1;
if (node->rot_key_times[next_key] >= anim_time) {
break;
}
}
float total_t = node->rot_key_times[next_key] - node->rot_key_times[prev_key];
float t = (anim_time - node->rot_key_times[prev_key]) / total_t;
versor qi = node->rot_keys[prev_key];
versor qf = node->rot_keys[next_key];
versor slerped = slerp (qi, qf, t);
node_R = quat_to_mat4 (slerped);
}
local_anim = node_T * node_R;
// if node has a weighted bone...
int bone_i = node->bone_index;
if (bone_i > -1) {
// ... then get offset matrices
mat4 bone_offset = bone_offset_mats[bone_i];
our_mat = parent_mat * local_anim;
bone_animation_mats[bone_i] = parent_mat * local_anim * bone_offset;
}
for (int i = 0; i < node->num_children; i++) {
skeleton_animate (
node->children[i],
anim_time,
our_mat,
bone_offset_mats,
bone_animation_mats
);
}
}
int main () {
GLFWwindow* window = NULL;
const GLubyte* renderer;
const GLubyte* version;
GLuint cube_sp, knot_sp;
GLuint vao;
//
// Start OpenGL using helper libraries
// --------------------------------------------------------------------------
if (!glfwInit ()) {
fprintf (stderr, "ERROR: could not start GLFW3\n");
return 1;
}
/* change to 3.2 if on Apple OS X
glfwWindowHint (GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint (GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint (GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint (GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); */
glfwWindowHint (GLFW_SAMPLES, msaa);
window = glfwCreateWindow (gl_width, gl_height, "{quadratic bezier}", NULL, NULL);
if (!window) {
fprintf (stderr, "ERROR: opening OS window\n");
return 1;
}
glfwMakeContextCurrent (window);
glewExperimental = GL_TRUE;
glewInit ();
/* get version info */
renderer = glGetString (GL_RENDERER); /* get renderer string */
version = glGetString (GL_VERSION); /* version as a string */
printf ("Renderer: %s\n", renderer);
printf ("OpenGL version supported %s\n", version);
int point_count = 0;
//
// Set up vertex buffers and vertex array object
// --------------------------------------------------------------------------
{
GLfloat* vp = NULL; // array of vertex points
GLfloat* vn = NULL; // array of vertex normals (we haven't used these yet)
GLfloat* vt = NULL; // array of texture coordinates (or these)
assert (load_obj_file ("smcube.obj", vp, vt, vn, point_count));
GLuint points_vbo, texcoord_vbo, normal_vbo;
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 3 * point_count,
vp, GL_STATIC_DRAW);
glGenBuffers (1, &texcoord_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 2 * point_count,
vt, GL_STATIC_DRAW);
glGenBuffers (1, &normal_vbo);
glBindBuffer (GL_ARRAY_BUFFER, normal_vbo);
glBufferData (GL_ARRAY_BUFFER, sizeof (float) * 3 * point_count,
vn, GL_STATIC_DRAW);
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glEnableVertexAttribArray (0);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (1);
glBindBuffer (GL_ARRAY_BUFFER, texcoord_vbo);
glVertexAttribPointer (1, 2, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (2);
glBindBuffer (GL_ARRAY_BUFFER, normal_vbo);
glVertexAttribPointer (2, 3, GL_FLOAT, GL_FALSE, 0, NULL);
free (vp);
free (vn);
free (vt);
}
//
// Load shaders from files
// --------------------------------------------------------------------------
{
char* vertex_shader_str;
char* fragment_shader_str;
// allocate some memory to store shader strings
vertex_shader_str = (char*)malloc (81920);
fragment_shader_str = (char*)malloc (81920);
// load shader strings from text files
assert (parse_file_into_str ("cube.vert", vertex_shader_str, 81920));
assert (parse_file_into_str ("cube.frag", fragment_shader_str, 81920));
GLuint vs, fs;
vs = glCreateShader (GL_VERTEX_SHADER);
fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (vs, 1, (const char**)&vertex_shader_str, NULL);
glShaderSource (fs, 1, (const char**)&fragment_shader_str, NULL);
// free memory
free (vertex_shader_str);
free (fragment_shader_str);
glCompileShader (vs);
glCompileShader (fs);
cube_sp = glCreateProgram ();
glAttachShader (cube_sp, fs);
glAttachShader (cube_sp, vs);
glBindAttribLocation (cube_sp, 0, "vp");
glBindAttribLocation (cube_sp, 1, "vt");
glBindAttribLocation (cube_sp, 2, "vn");
glLinkProgram (cube_sp);
}
{
char* vertex_shader_str;
char* fragment_shader_str;
// allocate some memory to store shader strings
vertex_shader_str = (char*)malloc (81920);
fragment_shader_str = (char*)malloc (81920);
// load shader strings from text files
assert (parse_file_into_str ("knot.vert", vertex_shader_str, 81920));
assert (parse_file_into_str ("knot.frag", fragment_shader_str, 81920));
GLuint vs, fs;
vs = glCreateShader (GL_VERTEX_SHADER);
fs = glCreateShader (GL_FRAGMENT_SHADER);
glShaderSource (vs, 1, (const char**)&vertex_shader_str, NULL);
glShaderSource (fs, 1, (const char**)&fragment_shader_str, NULL);
// free memory
free (vertex_shader_str);
free (fragment_shader_str);
glCompileShader (vs);
glCompileShader (fs);
knot_sp = glCreateProgram ();
glAttachShader (knot_sp, fs);
glAttachShader (knot_sp, vs);
glLinkProgram (knot_sp);
}
//
// Create some matrices
// --------------------------------------------------------------------------
mat4 M, V, P;
M = identity_mat4 ();//scale (identity_mat4 (), vec3 (0.05, 0.05, 0.05));
vec3 cam_pos (0.0, 0.0, 15.0);
vec3 targ_pos (0.0, 0.0, 0.0);
vec3 up = normalise (vec3 (0.0, 1.0, 0.0));
V = look_at (cam_pos, targ_pos, up);
P = perspective (67.0f, (float)gl_width / (float)gl_height, 0.1, 1000.0);
int M_loc = glGetUniformLocation (cube_sp, "M");
int V_loc = glGetUniformLocation (cube_sp, "V");
int P_loc = glGetUniformLocation (cube_sp, "P");
int A_loc = glGetUniformLocation (cube_sp, "A");
int B_loc = glGetUniformLocation (cube_sp, "B");
int C_loc = glGetUniformLocation (cube_sp, "C");
int t_loc = glGetUniformLocation (cube_sp, "t");
// send matrix values to shader immediately
glUseProgram (cube_sp);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glUniformMatrix4fv (V_loc, 1, GL_FALSE, V.m);
glUniformMatrix4fv (P_loc, 1, GL_FALSE, P.m);
//
// specific knots for bezier here A, C are start, end, B is control point
//
vec3 A = vec3 (-7.0f, -5.0f, 0.0f);
vec3 B = vec3 (0.0f, 8.0f, 0.0f);
vec3 C = vec3 (7.0f, -5.0f, 0.0f);
glUniform3fv (A_loc, 1, A.v);
glUniform3fv (B_loc, 1, B.v);
glUniform3fv (C_loc, 1, C.v);
int knot_loc = glGetUniformLocation (knot_sp, "pos");
int knotP_loc = glGetUniformLocation (knot_sp, "P");
int knotV_loc = glGetUniformLocation (knot_sp, "V");
glUseProgram (knot_sp);
glUniformMatrix4fv (knotV_loc, 1, GL_FALSE, V.m);
glUniformMatrix4fv (knotP_loc, 1, GL_FALSE, P.m);
//
// Start rendering
// --------------------------------------------------------------------------
// tell GL to only draw onto a pixel if the fragment is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glDepthFunc (GL_LESS); // depth-testing is to use a "less than" function
glEnable (GL_CULL_FACE); // enable culling of faces
glCullFace (GL_BACK);
glFrontFace (GL_CCW);
glClearColor (0.04, 0.04, 0.75, 1.0);
/* Render Points, allow resize in vertex shader */
glEnable (GL_PROGRAM_POINT_SIZE);
glPointParameteri (GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
float t = 0.0f;
float speed = 0.5f;
double prev = glfwGetTime ();
while (!glfwWindowShouldClose (window)) {
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// just the default viewport, covering the whole render area
glViewport (0, 0, gl_width, gl_height);
double curr = glfwGetTime ();
double elapsed = curr - prev;
prev = curr;
//
// move along spline
if (GLFW_PRESS == glfwGetKey (window, GLFW_KEY_LEFT)) {
t -= elapsed * speed;
if (t < 0.0f) {
t = 0.0f;
}
}
if (GLFW_PRESS == glfwGetKey (window, GLFW_KEY_RIGHT)) {
t += elapsed * speed;
if (t > 1.0f) {
t = 1.0f;
}
}
//
// render 3 knots
glEnable (GL_PROGRAM_POINT_SIZE);
glUseProgram (knot_sp);
glUniform3fv (knot_loc, 1, A.v);
glDrawArrays (GL_POINTS, 0, 1);
glUseProgram (knot_sp);
glUniform3fv (knot_loc, 1, B.v);
glDrawArrays (GL_POINTS, 0, 1);
glUseProgram (knot_sp);
glUniform3fv (knot_loc, 1, C.v);
glDrawArrays (GL_POINTS, 0, 1);
glDisable (GL_PROGRAM_POINT_SIZE);
glUseProgram (cube_sp);
glBindVertexArray (vao);
M = identity_mat4 ();//rotate_y_deg (identity_mat4 (), a);
glUniformMatrix4fv (M_loc, 1, GL_FALSE, M.m);
glUniform1f (t_loc, t);
glDrawArrays (GL_TRIANGLES, 0, point_count);
/* this just updates window events and keyboard input events (not used yet) */
glfwPollEvents ();
glfwSwapBuffers (window);
}
return 0;
}
/**
* Called everytime we press a key on the keyboard
* in window - the focused window
* in key - which key?
* in scancode
* in action - One of GFLW_PRESS, GLFW_REPEAT or GLFW_RELEASE
*/
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
switch (key) {
case GLFW_KEY_W:
input.wPressed = action == GLFW_PRESS ? true: ((action == GLFW_RELEASE) ? false: input.wPressed);
camera.move_angle = action == GLFW_PRESS ? 0:camera.move_angle;
break;
case GLFW_KEY_S:
input.sPressed = action == GLFW_PRESS ? true: ((action == GLFW_RELEASE) ? false: input.sPressed);
camera.move_angle = action == GLFW_PRESS ? 180:camera.move_angle;
break;
case GLFW_KEY_A:
input.aPressed = action == GLFW_PRESS ? true: ((action == GLFW_RELEASE) ? false: input.aPressed);
camera.move_angle = action == GLFW_PRESS ? -90:camera.move_angle;
break;
case GLFW_KEY_D:
input.dPressed = action == GLFW_PRESS ? true: ((action == GLFW_RELEASE) ? false: input.dPressed);
camera.move_angle = action == GLFW_PRESS ? 90:camera.move_angle;
break;
case GLFW_KEY_PAGE_UP:
if (action == GLFW_PRESS) {
switch (state) {
case STATE_POSITION: cursor.Y = grid.heightValue += 1.0f;updateGridHeight(&grid, &cursor); break;
case STATE_SCALE:break;
case STATE_ORIENTATION:
cursor.roll += 45.0f;
calculateCursorRotations(&cursor);break;
}
}
break;
case GLFW_KEY_PAGE_DOWN:
if (action == GLFW_PRESS) {
switch (state) {
case STATE_POSITION:
cursor.Y = grid.heightValue -= 1.0f;
updateGridHeight(&grid, &cursor);
break;
case STATE_SCALE:break;
case STATE_ORIENTATION:
cursor.roll -= 45.0f;
calculateCursorRotations(&cursor);
break;
}
}
break;
case GLFW_KEY_UP:
if(action == GLFW_PRESS || action == GLFW_REPEAT) {
switch (state) {
case STATE_POSITION:
cursor.Z += 1.0f;
break;
case STATE_SCALE:
cursor.Xs += 0.2f;
updateScales(&cursor);
break;
case STATE_ORIENTATION:
cursor.pitch += 45.0f;
calculateCursorRotations(&cursor);
break;
}
}
break;
case GLFW_KEY_DOWN:
if(action == GLFW_PRESS || action == GLFW_REPEAT)
{
switch (state) {
case STATE_POSITION:
cursor.Z -= 1.0f;
break;
case STATE_SCALE:
cursor.Xs -= 0.2f;
updateScales(&cursor);
break;
case STATE_ORIENTATION:
cursor.pitch -= 45.0f;
calculateCursorRotations(&cursor);
break;
}
}
break;
case GLFW_KEY_LEFT:
if(action == GLFW_PRESS || action == GLFW_REPEAT)
{
switch (state) {
case STATE_POSITION:
cursor.X += 1.0f;
break;
case STATE_SCALE:
cursor.Zs += 0.2f;
updateScales(&cursor);
break;
case STATE_ORIENTATION:
cursor.yaw += 45.0f;
calculateCursorRotations(&cursor);
break;
}
}
break;
case GLFW_KEY_RIGHT:
if(action == GLFW_PRESS || action == GLFW_REPEAT)
{
switch (state) {
case STATE_POSITION:
cursor.X -= 1.0f;
break;
case STATE_SCALE:
cursor.Zs -= 0.2f;
updateScales(&cursor);
break;
case STATE_ORIENTATION:
cursor.yaw -= 45.0f;
calculateCursorRotations(&cursor);
break;
}
}
break;
case GLFW_KEY_ENTER: {
//create a new wall and place it into walls vector.
Wall wall = {};
wall.position = vec3(cursor.X, cursor.Y, cursor.Z);
wall.orientation = vec3(cursor.pitch, cursor.yaw, cursor.roll);
wall.scale = vec3(cursor.Xs, cursor.Ys, cursor.Zs);
wall.T = translate(identity_mat4(), vec3(-wall.position.v[0], wall.position.v[1], -wall.position.v[2]));
walls.push_back(wall);
}
break;
case GLFW_KEY_1:state = STATE_POSITION; break;
case GLFW_KEY_2:state = STATE_ORIENTATION;break;
case GLFW_KEY_3:state = STATE_SCALE; break;
}
}
int main () {
restart_gl_log ();
start_gl ();
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // set counter-clock-wise vertex order to mean the front
glClearColor (0.2, 0.2, 0.2, 1.0); // grey background to help spot mistakes
glViewport (0, 0, g_gl_width, g_gl_height);
/* load the mesh using assimp */
GLuint monkey_vao;
int monkey_point_count = 0;
assert (load_mesh (MESH_FILE, &monkey_vao, &monkey_point_count));
/*-------------------------------CREATE SHADERS-------------------------------*/
GLuint shader_programme = create_programme_from_files (
VERTEX_SHADER_FILE, FRAGMENT_SHADER_FILE
);
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
float cam_speed = 1.0f; // 1 unit per second
float cam_yaw_speed = 10.0f; // 10 degrees per second
float cam_pos[] = {0.0f, 0.0f, 5.0f}; // don't start at zero, or we will be too close
float cam_yaw = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw);
mat4 view_mat = R * T;
int view_mat_location = glGetUniformLocation (shader_programme, "view");
glUseProgram (shader_programme);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
int proj_mat_location = glGetUniformLocation (shader_programme, "proj");
glUseProgram (shader_programme);
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, proj_mat);
while (!glfwWindowShouldClose (g_window)) {
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
_update_fps_counter (g_window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, g_gl_width, g_gl_height);
glUseProgram (shader_programme);
glBindVertexArray (monkey_vao);
glDrawArrays (GL_TRIANGLES, 0, monkey_point_count);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
if (glfwGetKey (g_window, GLFW_KEY_A)) {
cam_pos[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_D)) {
cam_pos[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_UP)) {
cam_pos[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_DOWN)) {
cam_pos[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_W)) {
cam_pos[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_S)) {
cam_pos[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_LEFT)) {
cam_yaw += cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
// update view matrix
if (cam_moved) {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2])); // cam translation
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw); //
mat4 view_mat = R * T;
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
}
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (g_window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}
int main () {
assert (restart_gl_log ());
assert (start_gl ());
/* set up framebuffer with texture attachment */
assert (init_fb ());
/* load the picking shaders */
g_pick_sp = create_programme_from_files (PICK_VS, PICK_FS);
g_pick_unique_id_loc = glGetUniformLocation (g_pick_sp, "unique_id");
g_pick_P_loc = glGetUniformLocation (g_pick_sp, "P");
g_pick_V_loc = glGetUniformLocation (g_pick_sp, "V");
g_pick_M_loc = glGetUniformLocation (g_pick_sp, "M");
assert (g_pick_P_loc > -1);
assert (g_pick_V_loc > -1);
assert (g_pick_M_loc > -1);
/* load a mesh to draw in the main scene */
load_sphere ();
GLuint sphere_sp = create_programme_from_files (SPHERE_VS, SPHERE_FS);
GLint sphere_P_loc = glGetUniformLocation (sphere_sp, "P");
GLint sphere_V_loc = glGetUniformLocation (sphere_sp, "V");
GLint sphere_M_loc = glGetUniformLocation (sphere_sp, "M");
assert (sphere_P_loc > -1);
assert (sphere_V_loc > -1);
assert (sphere_M_loc > -1);
/* set up view and projection matrices for sphere shader */
mat4 P = perspective (
67.0f, (float)g_gl_width / (float)g_gl_height, 0.1f, 100.0f);
mat4 V = look_at (
vec3 (0.0f, 0.0f, 5.0f), vec3 (0.0f, 0.0f, 0.0f), vec3 (0.0f, 1.0f, 0.0f));
glUseProgram (sphere_sp);
glUniformMatrix4fv (sphere_P_loc, 1, GL_FALSE, P.m);
glUniformMatrix4fv (sphere_V_loc, 1, GL_FALSE, V.m);
glViewport (0, 0, g_gl_width, g_gl_height);
while (!glfwWindowShouldClose (g_window)) {
_update_fps_counter (g_window);
/* bind the 'render to a texture' framebuffer for main scene */
glBindFramebuffer (GL_FRAMEBUFFER, 0);
/* clear the framebuffer's colour and depth buffers */
glClearColor (0.2, 0.2, 0.2, 1.0);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// render an obj or something
glUseProgram (sphere_sp);
glBindVertexArray (g_sphere_vao);
// model matrices for all 3 spheres
mat4 Ms[3];
// first sphere
Ms[0] = identity_mat4 ();
glUniformMatrix4fv (sphere_M_loc, 1, GL_FALSE, Ms[0].m);
glDrawArrays (GL_TRIANGLES, 0, g_sphere_point_count);
// 2nd sphere
Ms[1] = translate (identity_mat4 (), vec3 (1.0, -1.0, -4.0));
glUniformMatrix4fv (sphere_M_loc, 1, GL_FALSE, Ms[1].m);
glDrawArrays (GL_TRIANGLES, 0, g_sphere_point_count);
// 3rd sphere
Ms[2] = translate (identity_mat4 (), vec3 (-0.50, 2.0, -2.0));
glUniformMatrix4fv (sphere_M_loc, 1, GL_FALSE, Ms[2].m);
glDrawArrays (GL_TRIANGLES, 0, g_sphere_point_count);
/* bind framebuffer for pick */
draw_picker_colours (P, V, Ms);
// flip drawn framebuffer onto the display
glfwSwapBuffers (g_window);
glfwPollEvents ();
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
debug_colours = glfwGetKey (g_window, GLFW_KEY_SPACE);
if (glfwGetMouseButton (g_window, 0)) {
glBindFramebuffer (GL_FRAMEBUFFER, g_fb);
double xpos, ypos;
glfwGetCursorPos (g_window, &xpos, &ypos);
int mx = (int)xpos;
int my = (int)ypos;
unsigned char data[4] = {0, 0, 0, 0};
glReadPixels (
mx, g_gl_height - my, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &data);
int id = decode_id ((int)data[0], (int)data[1], (int)data[2]);
int mid = -1;
if (id == 255) {
mid = 0;
}
if (id == 65280) {
mid = 1;
}
if (id == 16711680) {
mid = 2;
}
printf ("%i,%i,%i means -> id was %i, and monkey number is %i\n",
data[0], data[1], data[2], id, mid);
glBindFramebuffer (GL_FRAMEBUFFER, 0);
}
}
return 0;
}
int main () {
restart_gl_log ();
// use GLFW and GLEW to start GL context. see gl_utils.cpp for details
start_gl ();
// tell GL to only draw onto a pixel if the shape is closer to the viewer
glEnable (GL_DEPTH_TEST); // enable depth-testing
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
/* OTHER STUFF GOES HERE NEXT */
GLfloat points[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.5f, 0.5f, 0.0f,
0.5f, 0.5f, 0.0f,
-0.5f, 0.5f, 0.0f,
-0.5f, -0.5f, 0.0f
};
// 2^16 = 65536
GLfloat texcoords[] = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
1.0f, 1.0f,
0.0f, 1.0f,
0.0f, 0.0f
};
GLuint points_vbo;
glGenBuffers (1, &points_vbo);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glBufferData (GL_ARRAY_BUFFER, 18 * sizeof (GLfloat), points, GL_STATIC_DRAW);
GLuint texcoords_vbo;
glGenBuffers (1, &texcoords_vbo);
glBindBuffer (GL_ARRAY_BUFFER, texcoords_vbo);
glBufferData (GL_ARRAY_BUFFER, 12 * sizeof (GLfloat), texcoords, GL_STATIC_DRAW);
GLuint vao;
glGenVertexArrays (1, &vao);
glBindVertexArray (vao);
glBindBuffer (GL_ARRAY_BUFFER, points_vbo);
glVertexAttribPointer (0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glBindBuffer (GL_ARRAY_BUFFER, texcoords_vbo);
glVertexAttribPointer (1, 2, GL_FLOAT, GL_FALSE, 0, NULL); // normalise!
glEnableVertexAttribArray (0);
glEnableVertexAttribArray (1);
GLuint shader_programme = create_programme_from_files (
"test_vs.glsl", "test_fs.glsl");
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
float cam_speed = 1.0f; // 1 unit per second
float cam_yaw_speed = 10.0f; // 10 degrees per second
float cam_pos[] = {0.0f, 0.0f, 2.0f}; // don't start at zero, or we will be too close
float cam_yaw = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw);
mat4 view_mat = R * T;
int view_mat_location = glGetUniformLocation (shader_programme, "view");
glUseProgram (shader_programme);
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
int proj_mat_location = glGetUniformLocation (shader_programme, "proj");
glUseProgram (shader_programme);
glUniformMatrix4fv (proj_mat_location, 1, GL_FALSE, proj_mat);
// load texture
GLuint tex;
assert (load_texture ("skulluvmap.png", &tex));
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // GL_CCW for counter clock-wise
while (!glfwWindowShouldClose (g_window)) {
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
_update_fps_counter (g_window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, g_gl_width, g_gl_height);
glUseProgram (shader_programme);
glBindVertexArray (vao);
// draw points 0-3 from the currently bound VAO with current in-use shader
glDrawArrays (GL_TRIANGLES, 0, 6);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
if (glfwGetKey (g_window, GLFW_KEY_A)) {
cam_pos[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_D)) {
cam_pos[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_UP)) {
cam_pos[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_DOWN)) {
cam_pos[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_W)) {
cam_pos[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_S)) {
cam_pos[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_LEFT)) {
cam_yaw += cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
// update view matrix
if (cam_moved) {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2])); // cam translation
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw); //
mat4 view_mat = R * T;
glUniformMatrix4fv (view_mat_location, 1, GL_FALSE, view_mat.m);
}
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (g_window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}
int main () {
restart_gl_log ();
// use GLFW and GLEW to start GL context. see gl_utils.cpp for details
start_gl ();
/* create buffer of particle initial attributes and a VAO */
GLuint vao = gen_particles ();
GLuint shader_programme = create_programme_from_files (
"test_vs.glsl", "test_fs.glsl");
#define ONE_DEG_IN_RAD (2.0 * M_PI) / 360.0 // 0.017444444
// input variables
float near = 0.1f; // clipping plane
float far = 100.0f; // clipping plane
float fov = 67.0f * ONE_DEG_IN_RAD; // convert 67 degrees to radians
float aspect = (float)g_gl_width / (float)g_gl_height; // aspect ratio
// matrix components
float range = tan (fov * 0.5f) * near;
float Sx = (2.0f * near) / (range * aspect + range * aspect);
float Sy = near / range;
float Sz = -(far + near) / (far - near);
float Pz = -(2.0f * far * near) / (far - near);
GLfloat proj_mat[] = {
Sx, 0.0f, 0.0f, 0.0f,
0.0f, Sy, 0.0f, 0.0f,
0.0f, 0.0f, Sz, -1.0f,
0.0f, 0.0f, Pz, 0.0f
};
float cam_speed = 1.0f; // 1 unit per second
float cam_yaw_speed = 10.0f; // 10 degrees per second
float cam_pos[] = {0.0f, 0.0f, 2.0f}; // don't start at zero, or we will be too close
float cam_yaw = 0.0f; // y-rotation in degrees
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2]));
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw);
mat4 view_mat = R * T;
/* make up a world position for the emitter */
vec3 emitter_world_pos (0.0f, 0.0f, 0.0f);
// locations of view and projection matrices
int V_loc = glGetUniformLocation (shader_programme, "V");
assert (V_loc > -1);
int P_loc = glGetUniformLocation (shader_programme, "P");
assert (P_loc > -1);
int emitter_pos_wor_loc = glGetUniformLocation (shader_programme,
"emitter_pos_wor");
assert (emitter_pos_wor_loc > -1);
int elapsed_system_time_loc = glGetUniformLocation (shader_programme,
"elapsed_system_time");
assert (elapsed_system_time_loc > -1);
glUseProgram (shader_programme);
glUniformMatrix4fv (V_loc, 1, GL_FALSE, view_mat.m);
glUniformMatrix4fv (P_loc, 1, GL_FALSE, proj_mat);
glUniform3f (emitter_pos_wor_loc,
emitter_world_pos.v[0],
emitter_world_pos.v[1],
emitter_world_pos.v[2]);
// load texture
GLuint tex;
if (!load_texture ("Droplet.png", &tex)) {
gl_log_err ("ERROR: loading Droplet.png texture\n");
return 1;
}
glEnable (GL_CULL_FACE); // cull face
glCullFace (GL_BACK); // cull back face
glFrontFace (GL_CCW); // GL_CCW for counter clock-wise
glDepthFunc (GL_LESS); // depth-testing interprets a smaller value as "closer"
glEnable (GL_DEPTH_TEST); // enable depth-testing
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glClearColor (0.2, 0.2, 0.2, 1.0);
/* MUST use this is in compatibility profile. doesn't exist in core
glEnable(GL_POINT_SPRITE);
*/
while (!glfwWindowShouldClose (g_window)) {
static double previous_seconds = glfwGetTime ();
double current_seconds = glfwGetTime ();
double elapsed_seconds = current_seconds - previous_seconds;
previous_seconds = current_seconds;
_update_fps_counter (g_window);
// wipe the drawing surface clear
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glViewport (0, 0, g_gl_width, g_gl_height);
/* Render Particles. Enabling point re-sizing in vertex shader */
glEnable (GL_PROGRAM_POINT_SIZE);
glPointParameteri (GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
glEnable (GL_BLEND);
glDepthMask (GL_FALSE);
glActiveTexture (GL_TEXTURE0);
glBindTexture (GL_TEXTURE_2D, tex);
glUseProgram (shader_programme);
/* update time in shaders */
glUniform1f (elapsed_system_time_loc, (GLfloat)current_seconds);
glBindVertexArray (vao);
// draw points 0-3 from the currently bound VAO with current in-use shader
glDrawArrays (GL_POINTS, 0, PARTICLE_COUNT);
glDisable (GL_BLEND);
glDepthMask (GL_TRUE);
glDisable (GL_PROGRAM_POINT_SIZE);
// update other events like input handling
glfwPollEvents ();
// control keys
bool cam_moved = false;
if (glfwGetKey (g_window, GLFW_KEY_A)) {
cam_pos[0] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_D)) {
cam_pos[0] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_UP)) {
cam_pos[1] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_PAGE_DOWN)) {
cam_pos[1] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_W)) {
cam_pos[2] -= cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_S)) {
cam_pos[2] += cam_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_LEFT)) {
cam_yaw += cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
if (glfwGetKey (g_window, GLFW_KEY_RIGHT)) {
cam_yaw -= cam_yaw_speed * elapsed_seconds;
cam_moved = true;
}
// update view matrix
if (cam_moved) {
mat4 T = translate (identity_mat4 (), vec3 (-cam_pos[0], -cam_pos[1], -cam_pos[2])); // cam translation
mat4 R = rotate_y_deg (identity_mat4 (), -cam_yaw); //
mat4 view_mat = R * T;
glUniformMatrix4fv (V_loc, 1, GL_FALSE, view_mat.m);
}
if (GLFW_PRESS == glfwGetKey (g_window, GLFW_KEY_ESCAPE)) {
glfwSetWindowShouldClose (g_window, 1);
}
// put the stuff we've been drawing onto the display
glfwSwapBuffers (g_window);
}
// close GL context and any other GLFW resources
glfwTerminate();
return 0;
}