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| float coords [] = {
// coordonnées d'un cube
...
};
float normals [] = {
// normales d'un cube
...
};
float texCoords [] = {
// coordonnées de texture d'un cube
...
};
GLushort indices [] = {
// indices d'un cube
...
};
float ambiant[] = {
0.3, 0.3, 0.3, 1
};
float diffuse [] = {
0.7, 0.7, 0.7, 1
};
float position [] = {
3, 0, 8, 1
};
struct vertex_t {
float x, y, z;
float nx, ny, nz;
float tx, ty;
float pad;
};
struct texel_t {
GLubyte r, g, b, a;
};
GLuint vboId;
GLuint ivboId;
GLuint texId;
void initGL() {
glLightfv(GL_LIGHT0, GL_AMBIENT, ambiant);
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
glLightfv(GL_LIGHT0, GL_POSITION, position);
glEnable(GL_LIGHT0);
glDisable(GL_DITHER);
glEnable(GL_TEXTURE_2D);
glShadeModel(GL_SMOOTH);
glClearColor(0, 0, 0, 0.5f);
glClearDepthf(1.f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
//glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);
glGenBuffers(1, &vboId);
glGenBuffers(1, &ivboId);
glGenTextures(1, &texId);
glBindBuffer(GL_ARRAY_BUFFER, vboId);
const GLuint numV = 24;
vertex_t vertices [numV];
for (GLuint i=0; i<numV; i++) {
vertices[i].x = coords[3*i];
vertices[i].y = coords[3*i+1];
vertices[i].z = coords[3*i+2];
vertices[i].nx = normals[3*i];
vertices[i].ny = normals[3*i+1];
vertices[i].nz = normals[3*i+2];
vertices[i].tx = texCoords[2*i];
vertices[i].ty = texCoords[2*i+1];
}
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ivboId);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBindTexture(GL_TEXTURE_2D, texId);
const GLuint tsize = 256;
texel_t texels [tsize*tsize];
for(GLuint i=0; i<tsize*tsize; i++) {
texels[i].r = 255; // fake red texture
texels[i].g = 0;
texels[i].b = 0;
texels[i].a = 255;
}
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, 4, tsize, tsize, 0, GL_RGBA, GL_UNSIGNED_BYTE, texels);
}
const float rspeed = 2;
float rot = 0;
void renderGL() {
glClear(GL_COLOR_BUFFER_BIT |
GL_DEPTH_BUFFER_BIT);
glFrontFace(GL_CCW);
glBindBuffer(GL_ARRAY_BUFFER, vboId);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ivboId);
glBindTexture(GL_TEXTURE_2D, texId);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glVertexPointer(3, GL_FLOAT, sizeof(vertex_t), 0);
glNormalPointer(GL_FLOAT, sizeof(vertex_t),
reinterpret_cast<GLvoid*>(3*sizeof(float)));
glTexCoordPointer(2, GL_FLOAT, sizeof(vertex_t),
reinterpret_cast<GLvoid*>(6*sizeof(float)));
glLoadIdentity();
glTranslatef(0, 0, -8);
glRotatef(rot, 0, 1, 0);
rot += rspeed;
glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_SHORT, 0);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
}
void destroyGL() {
glDeleteTextures(1, &texId);
glDeleteBuffers(1, &ivboId);
glDeleteBuffers(1, &vboId);
} |
