void texture::gennormcubemap(unsigned int facesize,int * numbound)
{
cubeid=*numbound;
glGenTextures(1, &tex[cubeid]);
glBindTexture(GL_TEXTURE_CUBE_MAP, tex[cubeid]);
if (cubemap) delete cubemap;
cubemap = new float [facesize*facesize*3];
float offset = 0.5f;
float halfsize = facesize / 2.0f;
unsigned int x,y;
CVector3 temp;
unsigned int index = 0;
for (unsigned char face=0; face<=6; face++)
{
for (y=0; y<facesize; y++)
{
for (x=0; x<facesize; x++)
{
switch (face)
{
case 0: temp = CVector3( halfsize,y+offset-halfsize,-(x+offset-halfsize)); break;
case 1: temp = CVector3(-halfsize,y+offset-halfsize, x+offset-halfsize ); break;
case 2: temp = CVector3( x+offset-halfsize,-halfsize, y+offset-halfsize); break;
case 3: temp = CVector3( x+offset-halfsize,halfsize,-(y+offset-halfsize)); break;
case 4: temp = CVector3( x+offset-halfsize,y+offset-halfsize,halfsize); break;
case 5: temp = CVector3( -(x+offset-halfsize),(y+offset-halfsize),-halfsize); break;
}
temp = Normalize(temp);
cubemap[index++] = (float)(temp.x);
cubemap[index++] = (float)(temp.y);
cubemap[index++] = (float)(temp.z);
}
}
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X+face,0, GL_RGB, facesize, facesize, 0, GL_RGB, GL_UNSIGNED_BYTE, cubemap);
index=0;
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
delete cubemap;
} |
