static void HandleDDSMipmap(GLenum target, bool mipmaps, int num_mipmaps)
{
if (num_mipmaps > 0) {
// dds included the MipMaps use them
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
} else {
if (mipmaps && IS_GL_FUNCTION_AVAILABLE(glGenerateMipmap)) {
// create the mipmaps at runtime
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glGenerateMipmap(target);
} else {
// no mipmaps
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
}
}
void glBuildMipmaps(const GLenum target, GLint internalFormat, const GLsizei width, const GLsizei height, const GLenum format, const GLenum type, const void* data)
{
ScopedTimer timer("Textures::glBuildMipmaps");
if (globalRendering->compressTextures) {
switch ( internalFormat ) {
case 4:
case GL_RGBA8 :
case GL_RGBA : internalFormat = GL_COMPRESSED_RGBA_ARB; break;
case 3:
case GL_RGB8 :
case GL_RGB : internalFormat = GL_COMPRESSED_RGB_ARB; break;
case GL_LUMINANCE: internalFormat = GL_COMPRESSED_LUMINANCE_ARB; break;
}
}
// create mipmapped texture
if (IS_GL_FUNCTION_AVAILABLE(glGenerateMipmapEXT) && !globalRendering->atiHacks) {
// newest method
glTexImage2D(target, 0, internalFormat, width, height, 0, format, type, data);
if (globalRendering->atiHacks) {
glEnable(target);
glGenerateMipmapEXT(target);
glDisable(target);
} else {
glGenerateMipmapEXT(target);
}
} else if (GLEW_VERSION_1_4) {
// This required GL-1.4
// instead of using glu, we rely on glTexImage2D to create the Mipmaps.
glTexParameteri(target, GL_GENERATE_MIPMAP, GL_TRUE);
glTexImage2D(target, 0, internalFormat, width, height, 0, format, type, data);
} else {
gluBuild2DMipmaps(target, internalFormat, width, height, format, type, data);
}
}