struct Shader*
shader_new(GLuint *sources, unsigned count)
{
assert(sources != NULL);
assert(count > 0);
GLenum gl_err = GL_NO_ERROR;
GLuint prog = 0;
struct Shader *shader = NULL;
// create shader program
prog = glCreateProgram();
if (!prog) {
errf(
"failed to create shader program (OpenGL error %d)",
glGetError()
);
goto error;
}
// attach shaders and link the program
for (unsigned i = 0; i < count; i++) {
glAttachShader(prog, sources[i]);
}
glLinkProgram(prog);
if ((gl_err = glGetError()) != GL_NO_ERROR) {
errf("failed to link shader program (OpenGL error %d)", gl_err);
goto error;
}
// retrieve link status
int status = GL_FALSE;
glGetProgramiv(prog, GL_LINK_STATUS, &status);
if (status == GL_FALSE) {
// retrieve link log
int log_len;
glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &log_len);
char log[log_len];
glGetProgramInfoLog(prog, log_len, NULL, log);
errf("failed to link shader: %s", log);
goto error;
}
shader = malloc(sizeof(struct Shader));
shader->prog = prog;
if (!init_shader_params(shader)) {
err("failed to initialize shader params table");
goto error;
}
return shader;
error:
shader_free(shader);
return NULL;
}
void shaderprog_free(shaderprogram *prog) {
// Detach shaders
iterator it;
vector_iter_begin(&prog->shaders, &it);
shader *tmp;
while((tmp = iter_next(&it)) != NULL) {
glDetachShader(prog->id, tmp->id);
shader_free(tmp);
}
vector_free(&prog->shaders);
// Destroy program
glDeleteProgram(prog->id);
}
void free_graphic(void) {
window* window_handle = global_get(global_get_singleton(), GLOBAL_WINDOW);
hl_render* hl_render_handle = global_get(global_get_singleton(), GLOBAL_HL_RENDER);
camera* camera_handle = global_get(global_get_singleton(), GLOBAL_CAMERA);
input* input_handle = global_get(global_get_singleton(), GLOBAL_INPUT);
shader* shader_texture_handle = global_get(global_get_singleton(), GLOBAL_SHADER_TEXTURE);
text* text_handle = global_get(global_get_singleton(), GLOBAL_TEXT);
debug_draw* debug_draw_handle = global_get(global_get_singleton(), GLOBAL_DEBUG_DRAW);
window_free(&window_handle);
hl_render_free(&hl_render_handle);
camera_free(&camera_handle);
input_free(&input_handle);
shader_free(&shader_texture_handle);
text_free(&text_handle);
debug_draw_free(&debug_draw_handle);
}
int main(int argc, char* argv[])
{
int cw = 750;
int ch = 750;
cg_init(cw, ch, NULL);
glClearColor(0,0,1,1);
// Actualizar la pantalla:
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glViewport(0,0,cw, ch);
glFrustum(-1,1,-1,1,1,1000);
glEnable(GL_LIGHTING);
// glEnable(GL_NORMALIZE);
float l0[] = {1.0f,1.0f,1.0f,1.0f};
float la[] = {0.10f,0.10f,0.10f,1.0f};
float l0p[]= {1.0f,1.0f,1.0f,1.0f};
float ls[] = {1.0f,1.0f,1.0f,1.0f};
glLightfv(GL_LIGHT0, GL_AMBIENT, la);
glLightfv(GL_LIGHT0, GL_DIFFUSE, l0);
glLightfv(GL_LIGHT0, GL_POSITION, l0p);
glLightfv(GL_LIGHT0, GL_SPECULAR, ls);
glEnable(GL_LIGHT0);
float cyan[] = {1.0f, 1.0f, 1.0f, 1.f};
glMaterialfv(GL_FRONT, GL_DIFFUSE, cyan);
glMaterialfv(GL_FRONT, GL_SPECULAR, ls);
glMateriali(GL_FRONT, GL_SHININESS, 16);
float ang = 0.0f;
float pitch = 0.0f;
float ang_vel = 1.0f;
char done = 0;
char wireframe = 0;
char bfc = 0;
glEnable(GL_DEPTH_TEST);
char zbuff = 1;
unsigned char key_pressed[1024];
memset(key_pressed, 0, 1024);
char use_shader = 0;
char specular = 0;
Shader gouraud = shader_new("shaders/gouraud_vp.glsl", "shaders/gouraud_fp.glsl");
GLint uniform_especular = shader_get_unif_loc(gouraud, "especular");
GLint uniform_tex = shader_get_unif_loc(gouraud, "tex");
Obj* objPtr ;
int example = atoi(argv[1]);
if (example==1 || example==3)
objPtr = obj_load("../Models/knight_texturas.obj");
else if (example==2)
objPtr = obj_load("../Models/box_texturas.obj");
//Cargo la imagen de disco usando SDL_image
SDL_Surface* surface; // = IMG_Load("../Models/knight.png");
if (example==1 )
surface = IMG_Load("../Models/knight.png");
else if (example==2)
surface = IMG_Load("../Models/box.jpg");
else if (example==3)
surface = IMG_Load("../Models/knight_good.png");
// Obj* objPtr = obj_load("../Models/knight_texturas.obj");
// Obj* objPtr = obj_load("../Models/box_texturas.obj");
//Cargo la imagen de disco usando SDL_image
// SDL_Surface* surface = IMG_Load("../Models/knight.png");
// SDL_Surface* surface = IMG_Load("../Models/knight_good.png");
// SDL_Surface* surface = IMG_Load("../Models/box.jpg");
if (surface==NULL) { //Si falla la carga de la imagen, despliego el mensaje de error correspondiente y termino el programa.
printf("Error: \"%s\"\n", SDL_GetError());
return 1;
}
GLuint texture;
//Creo un espacio para alojar una textura en memoria de video
glGenTextures(1,&texture);
//Activo la textura nro 0
glActiveTexture(GL_TEXTURE0);
//Habilito la carga para la textura recien creada
glBindTexture(GL_TEXTURE_2D,texture);
//Cargo los datos de la imagen en la textura.
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGBA,
surface->w,
surface->h,
0,
GL_RGB,GL_UNSIGNED_BYTE,
surface->pixels);
//Luego de copiada la imagen a memoria de video, puedo liberarla sin problemas
SDL_FreeSurface(surface);
//Seteo el filtro a usar cuando se mapea la textura a una superficie mas chica (GL_LINEAR = filtro bilineal)
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_MIN_FILTER,
GL_LINEAR);
//Seteo el filtro a usar cuando se mapea la textura a una superficie mas grande (GL_LINEAR = filtro bilineal)
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_MAG_FILTER,
GL_LINEAR);
//Seteo el comportamiento cuando encuentro coordenadas de textura fuera del rango [0,1]
//GL_REPEAT es el comportamiento por defecto.
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_WRAP_S,
GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,
GL_TEXTURE_WRAP_T,
GL_REPEAT);
while (!done)
{
SDL_Event event;
while(SDL_PollEvent(&event))
{
switch (event.type)
{
case SDL_KEYDOWN:
key_pressed[event.key.keysym.sym] = 1;
if (event.key.keysym.sym == SDLK_p)
{
use_shader = !use_shader;
break;
}
else if (event.key.keysym.sym == SDLK_s)
{
specular = !specular;
break;
}
else if (event.key.keysym.sym == SDLK_z)
{
zbuff = !zbuff;
if(zbuff)
glEnable(GL_DEPTH_TEST);
else
glDisable(GL_DEPTH_TEST);
break;
}
else if (event.key.keysym.sym == SDLK_m)
{
wireframe = !wireframe;
if(wireframe)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
else
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
break;
}
else if (event.key.keysym.sym == SDLK_b)
{
bfc = !bfc;
if(bfc)
{
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CW);
}
else
glDisable(GL_CULL_FACE);
break;
}
else if (event.key.keysym.sym != SDLK_ESCAPE)
break;
case SDL_QUIT :
done = 1;
break;
case SDL_KEYUP:
key_pressed[event.key.keysym.sym] = 0;
}
}
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if (example==1 || example==3)
glTranslatef(0.0f, 0.0f, -50.0f);
else if (example==2)
glTranslatef(0.0f, 0.0f, -2.0f);
// glTranslatef(0.0f, 0.0f, -50.0f);
// glTranslatef(0.0f, 0.0f, -2.0f);
glRotatef(pitch, 1.0f, 0.0f, 0.0f);
glRotatef(ang, 0.0f, 1.0f, 0.0f);
glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
if(key_pressed[SDLK_RIGHT]) ang += ang_vel;
if(key_pressed[SDLK_LEFT]) ang -= ang_vel;
if(key_pressed[SDLK_UP]) pitch += ang_vel;
if(key_pressed[SDLK_DOWN]) pitch -= ang_vel;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
//Informo a OpenGL que para todas las operaciones a continuaci�n utilice las texturas 2D cargadas
glEnable(GL_TEXTURE_2D);
if(use_shader)
{
shader_use(gouraud);
glUniform1i(uniform_especular, specular);
//Le digo al shader que el sampler2D de nombre "tex" se corresponde con GL_TEXTURE0
//que es donde cargu� mi textura.
glUniform1i(uniform_tex, 0);
//Luego asocio la textura con el id "texture"
glBindTexture(GL_TEXTURE_2D,texture);
obj_render2(objPtr);
shader_stop(gouraud);
}
else
{
glBindTexture(GL_TEXTURE_2D,texture);
obj_render2(objPtr);
}
cg_repaint();
} // while
// Liberar recursos:
obj_free(objPtr);
shader_free(gouraud);
glDeleteTextures(1,&texture);
cg_close();
return 0;
}
void render_free(struct render* self) {
vertex_buffer_free(self->vertex_buffer);
shader_free(self->shader);
s_free(self);
}