/**
* @brief Renderer::initialize_pointsprites internally used to initialize point-sprite rendering
*/
void Renderer::initialize_pointsprites(){
glEnable(GL_POINT_SPRITE); // needed so that fragment shader can use gl_PointCoord
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE); // needed so vertex stage can set point size
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT);
glPointParameterf(GL_POINT_FADE_THRESHOLD_SIZE, 4);
glGenBuffers(1, &pointsprites_vbo);
glBindBuffer(GL_ARRAY_BUFFER, pointsprites_vbo);
glBufferData(GL_ARRAY_BUFFER,
3 /* size of a vertex in elements */
* dataset.bodycount /* number of vertices */
* sizeof(float), /* lastly, convert to bytes */
dataset.type_adapter_get(),
GL_DYNAMIC_DRAW);
glEnableVertexAttribArray(0); // xyz position
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float)*3 /* 3 components */, 0); // xyz positions
if(use_fancy_shaders){
pointsprites_shader = new Shader(SHADER_RESOURCE_PATH + "/pointsprite-fancier.vsh",
SHADER_RESOURCE_PATH + "/pointsprite-fancier.fsh");
}
else {
pointsprites_shader = new Shader(SHADER_RESOURCE_PATH + "/pointsprite.vsh",
SHADER_RESOURCE_PATH + "/pointsprite-simple.fsh");
}
}
bool begin()
{
bool Validated = true;
if(Validated)
Validated = initTexture();
if(Validated)
Validated = initProgram();
if(Validated)
Validated = initBuffer();
if(Validated)
Validated = initVertexArray();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//glEnable(GL_DEPTH_TEST);
//glDepthFunc(GL_LESS);
glEnable(GL_PROGRAM_POINT_SIZE);
//glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT);
return Validated;
}
inline void VL_glPointParameteri( GLenum pname, GLenum param)
{
if (glPointParameteri)
glPointParameteri(pname,param);
else
if (glPointParameteriNV)
glPointParameteriNV(pname,param);
else
VL_UNSUPPORTED_FUNC();
}
void StateSystem::RasterState::applyGL() const
{
//glFrontFace(frontFace);
glCullFace(cullFace);
//glPolygonOffset(polyOffsetFactor,polyOffsetUnits);
glPolygonMode(GL_FRONT_AND_BACK,polyMode);
//glLineWidth(lineWidth);
glPointSize(pointSize);
glPointParameterf(GL_POINT_FADE_THRESHOLD_SIZE,pointFade);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,pointSpriteOrigin);
}
bool begin()
{
bool Validated = true;
if(Validated)
Validated = initProgram();
if(Validated)
Validated = initBuffer();
if(Validated)
Validated = initVertexArray();
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glEnable(GL_PROGRAM_POINT_SIZE);
//glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT);
return Validated && this->checkError("begin");
}
void Surface::drawBillboard(Vector3<float> position, float pointSize) { /* テクスチャ環境 */
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D , texture[0]);
glEnable(GL_TEXTURE_2D);
glEnable(GL_POINT_SPRITE);
glColor3d(1.0, 1.0, 1.0);
glPointSize(pointSize);
glBegin(GL_POINTS);
//glRotatef(90, 0, 0, 1);
glVertex3f(position.x,position.y,position.z);
glEnd();
glDisable(GL_POINT_SPRITE);
glDisable(GL_TEXTURE_2D);
}
bool begin()
{
bool Validated(true);
glEnable(GL_PROGRAM_POINT_SIZE);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
//glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_UPPER_LEFT);
if(Validated)
Validated = initProgram();
if(Validated)
Validated = initBuffer();
if(Validated)
Validated = initVertexArray();
if(Validated)
Validated = initTexture();
if(Validated)
Validated = initFramebuffer();
return Validated;
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_GL14_nglPointParameteri(JNIEnv *env, jclass clazz, jint pname, jint param, jlong function_pointer) {
glPointParameteriPROC glPointParameteri = (glPointParameteriPROC)((intptr_t)function_pointer);
glPointParameteri(pname, param);
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_GL14C_glPointParameteri(JNIEnv *__env, jclass clazz, jint pname, jint param) {
glPointParameteriPROC glPointParameteri = (glPointParameteriPROC)tlsGetFunction(429);
UNUSED_PARAM(clazz)
glPointParameteri(pname, param);
}
void DemoInputInterpreter::interpretInput(Keyboard* keyboard)
{
// Camera* mainCamera =
// URE_INSTANCE->getSimulator(VISUAL_SIM_DOMAIN)->toLightingSimulator()->getMainCamera();
static float polygonOffSetFactor =2.5f;
static float polyGonOffsetUnit = 5.8f;
const float increment = 0.1f;
if(keyboard->getRecentStatus() == GLFW_PRESS)
{
if( (keyboard->getRecentKey()) == GLFW_KEY_UP)
{
polygonOffSetFactor += increment;
}
if( (keyboard->getRecentKey()) == GLFW_KEY_DOWN)
{
polygonOffSetFactor -= increment;
}
if( (keyboard->getRecentKey()) == GLFW_KEY_LEFT)
{
polyGonOffsetUnit += increment;
}
if( (keyboard->getRecentKey()) == GLFW_KEY_RIGHT)
{
polyGonOffsetUnit -= increment;
}
// LOG<<DEBUG_LOG_LEVEL<<"polygonOffSetFactor: "<<polygonOffSetFactor
// <<"; polyGonOffsetUnit: "<<polyGonOffsetUnit<<";\n";
GUARD(glPolygonOffset(polygonOffSetFactor,polyGonOffsetUnit));
}
if(keyboard->getRecentKey() == GLFW_KEY_ENTER)
{
if(keyboard->getRecentStatus() == GLFW_PRESS)
{
LOG<<DEBUG_LOG_LEVEL<<"enter pressed;\n";
Vector2Dui currentRes = WindowManager::getInstance().getWindowResolution();
LOG<<INFO_LOG_LEVEL<<"Resolution is now ("<<currentRes.x<<","<<currentRes.y<<");\n";
}
else
{
LOG<<DEBUG_LOG_LEVEL<<"enter released;\n";
}
}
if( (keyboard->getRecentKey()) == 'W')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_FRONT_BACK] = MOVEMENT_STATE_FORWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_FRONT_BACK] = MOVEMENT_STATE_STILL;
}
}
if( (keyboard->getRecentKey()) == 'S')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_FRONT_BACK] = MOVEMENT_STATE_BACKWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_FRONT_BACK] = MOVEMENT_STATE_STILL;
}
}
if( (keyboard->getRecentKey()) == 'D')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_RIGHT_LEFT] = MOVEMENT_STATE_FORWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_RIGHT_LEFT] = MOVEMENT_STATE_STILL;
}
}
if( (keyboard->getRecentKey()) == 'A')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_RIGHT_LEFT] = MOVEMENT_STATE_BACKWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_RIGHT_LEFT] = MOVEMENT_STATE_STILL;
}
}
if( (keyboard->getRecentKey()) == 'Q')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_UP_DOWN] = MOVEMENT_STATE_BACKWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_UP_DOWN] = MOVEMENT_STATE_STILL;
}
}
if( (keyboard->getRecentKey()) == 'E')
{
if(keyboard->getRecentStatus() == GLFW_PRESS){
mMovementState[MOVEMENT_DIRECTION_UP_DOWN] = MOVEMENT_STATE_FORWARD;
}
else{
mMovementState[MOVEMENT_DIRECTION_UP_DOWN] = MOVEMENT_STATE_STILL;
}
}
//----------------------------------------------------------------------------
if(keyboard->getRecentKey() == GLFW_KEY_F2)
{
GUARD(glPolygonMode(GL_FRONT_AND_BACK, GL_POINT));
GUARD(glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT));
GUARD(glEnable(GL_PROGRAM_POINT_SIZE));
}
if(keyboard->getRecentKey() == GLFW_KEY_F3)
{
GUARD(glDisable(GL_PROGRAM_POINT_SIZE));
GUARD(glPolygonMode(GL_FRONT_AND_BACK, GL_LINE));
}
if(keyboard->getRecentKey() == GLFW_KEY_F4)
{
GUARD(glDisable(GL_PROGRAM_POINT_SIZE));
GUARD(glPolygonMode(GL_FRONT_AND_BACK, GL_FILL));
}
if( (keyboard->getRecentKey() == GLFW_KEY_TAB) && (keyboard->getRecentStatus() == GLFW_PRESS) )
{
URE_INSTANCE->toggleDoDebugDraw();
}
if((keyboard->getRecentKey() == GLFW_KEY_SPACE) && (keyboard->getRecentStatus() == GLFW_PRESS))
{
mHideMouse = !mHideMouse;
}
//---------------------------------------------------------------------------
//static ShadingFeatures currentlyEnabledFeatures = ShaderManager::getInstance().getEnabledShadingFeatures();
if(keyboard->getRecentStatus() == GLFW_PRESS)
{
ShadingFeatures sfToChange = SHADING_FEATURE_NONE;
switch (keyboard->getRecentKey())
{
case 'N':
sfToChange = SHADING_FEATURE_DIFFUSE_TEXTURING;
break;
case 'M':
sfToChange = SHADING_FEATURE_DIRECT_LIGHTING;
break;
case ',':
sfToChange = SHADING_FEATURE_NORMAL_MAPPING;
break;
case '.':
sfToChange = SHADING_FEATURE_CUBE_MAPPING;
break;
case '-':
sfToChange = SHADING_FEATURE_TESSELATION;
break;
default:
break;
}
if( sfToChange != SHADING_FEATURE_NONE)
{
ShaderManager::getInstance().setEnableShadingFeatures(
sfToChange,
//toggle current activations state by querying, negating and setting it
! ShaderManager::getInstance().shadingFeaturesAreEnabled(sfToChange)
);
}
}
// static bool enableTess =ShaderManager::getInstance().tesselationIsEnabled();
// if((keyboard->getRecentKey() == GLFW_KEY_TAB) && (keyboard->getRecentStatus() == GLFW_PRESS))
// {
// enableTess = !enableTess;
// ShaderManager::getInstance().setEnableTesselation(enableTess);
// }
//--------------------------------------------------------------------
if(keyboard->getRecentKey() == GLFW_KEY_ESC)
{
LOG<<DEBUG_LOG_LEVEL<<"escape pressed, shutting down;(;\n";
InputManager::getInstance().setMouseHidden(false);
URE_INSTANCE->requestMainLoopQuit();
}
}
static bool
test_pointsprite_ps(void)
{
static const float vertArray[ATTR_SIZE * NUM_ATTRS] = {
0.0f, 0.0f, 0.0f, 1.0f,
1.0f, 1.0f, 1.0f, 1.0f,
};
const unsigned int numPixels = WIDTH * HEIGHT;
GLuint texData[WIDTH * HEIGHT];
GLuint i, texFbo, fbo, vertexArray, vertexBuf;
GLint attrLoc;
const float pointSize = WIDTH;
const unsigned int expectedTexelColor = 0xFFFFFFFF;
for (i = 0; i < numPixels; ++i) {
texData[i] = COLOR_GRAY;
}
/* Create 2D textures */
glGenTextures(1, &texFbo);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texFbo);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, WIDTH, HEIGHT, 0,
GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, texData);
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* Setup the vertex attributes */
glGenVertexArrays(1, &vertexArray);
glBindVertexArray(vertexArray);
glGenBuffers(1, &vertexBuf);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuf);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertArray), vertArray,
GL_STATIC_DRAW);
for (i = 0; i < NUM_ATTRS; i++) {
const GLvoid *offset =
(const GLvoid *)(i * ATTR_SIZE * sizeof(float));
GLchar name[8];
snprintf(name, sizeof name, "Attr%d", i);
attrLoc = glGetAttribLocation(prog, name);
glEnableVertexAttribArray(attrLoc);
glVertexAttribPointer(attrLoc, ATTR_SIZE, GL_FLOAT, GL_FALSE,
ATTR_SIZE * sizeof(float), offset);
}
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
/* Setup the FBO */
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, texFbo, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
GL_FRAMEBUFFER_COMPLETE) {
printf("incomplete framebuffer at line %d\n", __LINE__);
return false;
}
glDrawBuffer(GL_COLOR_ATTACHMENT0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
GL_FRAMEBUFFER_COMPLETE) {
printf("incomplete framebuffer at line %d\n", __LINE__);
return false;
}
/* Clear and draw */
glViewport(0, 0, WIDTH, HEIGHT);
glClearColor(((CLEAR_COLOR >> 24) & 0xFF) / 255.0f,
((CLEAR_COLOR >> 16) & 0xFF) / 255.0f,
((CLEAR_COLOR >> 8) & 0xFF) / 255.0f,
((CLEAR_COLOR) & 0xFF) / 255.0f);
glClear(GL_COLOR_BUFFER_BIT);
glPointSize(pointSize);
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN, GL_LOWER_LEFT);
glDrawArrays(GL_POINTS, 0, 1);
/* Read back */
glReadBuffer(GL_COLOR_ATTACHMENT0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) !=
GL_FRAMEBUFFER_COMPLETE) {
printf("incomplete framebuffer at line %d\n", __LINE__);
return false;
}
/* read color buffer */
glPixelStorei(GL_PACK_ROW_LENGTH, WIDTH);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
memset(texData, 0, sizeof(texData));
glReadPixels(0, 0, WIDTH, HEIGHT,
GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, texData);
if (texData[0] != expectedTexelColor) {
printf("At pixel (0,0) expected 0x%x but found 0x%x\n",
expectedTexelColor, texData[0]);
/* clean up */
glDeleteTextures(1, &texFbo);
glDeleteFramebuffers(1, &fbo);
return false;
}
if (!piglit_check_gl_error(GL_NO_ERROR))
return false;
glDeleteTextures(1, &texFbo);
glDeleteFramebuffers(1, &fbo);
return true;
}
inline void pointCoordOrigin(PointCoordOrigin p) {
glPointParameteri(
GL_POINT_SPRITE_COORD_ORIGIN,
GLint(p)
);
}
/* ARGSUSED1 */
static void
key(unsigned char c, int x, int y)
{
switch (c) {
case 13:
animate = 1 - animate; /* toggle. */
if (animate && (motion || spin)) {
glutIdleFunc(idle);
} else {
glutIdleFunc(NULL);
}
break;
case ' ':
animate = 1;
makePointList();
glutIdleFunc(idle);
break;
case 'o':
case 'O':
org ^= 1;
#ifdef GL_VERSION_2_0
#ifdef GL_ARB_point_parameters
glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,
org ? GL_LOWER_LEFT : GL_UPPER_LEFT);
#endif
#endif
glutPostRedisplay();
break;
case 't':
case 'T':
sprite ^= 1;
glutPostRedisplay();
break;
case 's':
case 'S':
(smooth ^= 1) ? glEnable(GL_POINT_SMOOTH) : glDisable(GL_POINT_SMOOTH);
glutPostRedisplay();
break;
case 'f':
case 'F':
if (HaveShaders) {
UseFragShader = !UseFragShader;
glutPostRedisplay();
}
break;
case '0':
glPointSize(1.0);
glutPostRedisplay();
break;
case '1':
glPointSize(16.0);
glutPostRedisplay();
break;
case '2':
glPointSize(32.0);
glutPostRedisplay();
break;
case '3':
glPointSize(64.0);
glutPostRedisplay();
break;
case '4':
glPointSize(128.0);
glutPostRedisplay();
break;
case 27:
exit(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;
}
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;
}