unsigned int CBitmap::CreateTexture(bool mipmaps)
{
if(type == BitmapTypeDDS)
{
return CreateDDSTexture();
}
if(mem==NULL)
return 0;
// jcnossen: ATI drivers appear to support OpenGL 2.0, but switch to software rendering when non-power-of-two textures are used.
if ((xsize != next_power_of_2(xsize) || ysize != next_power_of_2(ysize)))
//&& strcmp(reinterpret_cast<const char*>(glGetString(GL_VERSION)), "2.0") < 0 )
{
CBitmap bm = CreateRescaled(next_power_of_2(xsize), next_power_of_2(ysize));
return bm.CreateTexture(mipmaps);
}
unsigned int texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
if(mipmaps)
{
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
// create mipmapped texture
if (strcmp(reinterpret_cast<const char*>(glGetString(GL_VERSION)), "1.4") >= 0) {
// This required GL-1.4
// instead of using glu, we rely on glTexImage2D to create the Mipmaps.
glTexParameteri(GL_TEXTURE_2D,GL_GENERATE_MIPMAP,true);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8 ,xsize, ysize, 0,GL_RGBA, GL_UNSIGNED_BYTE, mem);
} else
gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGBA8 ,xsize, ysize, GL_RGBA, GL_UNSIGNED_BYTE, mem);
}
else
{
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
//glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8 ,xsize, ysize, 0,GL_RGBA, GL_UNSIGNED_BYTE, mem);
//gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGBA8 ,xsize, ysize, GL_RGBA, GL_UNSIGNED_BYTE, mem);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8 ,xsize, ysize, 0,GL_RGBA, GL_UNSIGNED_BYTE, mem);
}
return texture;
}
const unsigned int CBitmap::CreateTexture(bool mipmaps) const
{
ScopedTimer timer("Textures::CBitmap::CreateTexture");
if (type == BitmapTypeDDS) {
return CreateDDSTexture();
}
if (mem == NULL) {
return 0;
}
// jcnossen: Some drivers return "2.0" as a version string,
// but switch to software rendering for non-power-of-two textures.
// GL_ARB_texture_non_power_of_two indicates that the hardware will actually support it.
if (!globalRendering->supportNPOTs && (xsize != next_power_of_2(xsize) || ysize != next_power_of_2(ysize)))
{
CBitmap bm = CreateRescaled(next_power_of_2(xsize), next_power_of_2(ysize));
return bm.CreateTexture(mipmaps);
}
unsigned int texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//FIXME add glPixelStorei(GL_UNPACK_ALIGNMENT, 1); for NPOTs
if (mipmaps) {
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
glBuildMipmaps(GL_TEXTURE_2D, GL_RGBA8, xsize, ysize, GL_RGBA, GL_UNSIGNED_BYTE, mem);
} else {
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
//glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA8 ,xsize, ysize, 0,GL_RGBA, GL_UNSIGNED_BYTE, mem);
//gluBuild2DMipmaps(GL_TEXTURE_2D,GL_RGBA8 ,xsize, ysize, GL_RGBA, GL_UNSIGNED_BYTE, mem);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, xsize, ysize, 0, GL_RGBA, GL_UNSIGNED_BYTE, mem);
}
return texture;
}
