TextureGL::TextureGL(const TextureDescriptor &descriptor) : Texture(descriptor), m_target(GL_TEXTURE_2D) // XXX don't force target
{
glGenTextures(1, &m_texture);
glBindTexture(m_target, m_texture);
glEnable(m_target);
switch (m_target) {
case GL_TEXTURE_2D:
if (descriptor.generateMipmaps)
glTexParameteri(m_target, GL_GENERATE_MIPMAP, GL_TRUE);
glTexImage2D(
m_target, 0, GLTextureFormat(descriptor.format),
descriptor.dataSize.x, descriptor.dataSize.y, 0,
GLImageFormatForTextureFormat(descriptor.format), GLImageTypeForTextureFormat(descriptor.format), 0);
break;
default:
assert(0);
}
GLenum magFilter, minFilter, wrapS, wrapT;
switch (descriptor.sampleMode) {
case LINEAR_CLAMP:
magFilter = GL_LINEAR;
minFilter = descriptor.generateMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
wrapS = wrapT = GL_CLAMP_TO_EDGE;
break;
case NEAREST_CLAMP:
magFilter = GL_NEAREST;
minFilter = descriptor.generateMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
wrapS = wrapT = GL_CLAMP_TO_EDGE;
break;
case LINEAR_REPEAT:
magFilter = GL_LINEAR;
minFilter = descriptor.generateMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
wrapS = wrapT = GL_REPEAT;
break;
case NEAREST_REPEAT:
magFilter = GL_NEAREST;
minFilter = descriptor.generateMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
wrapS = wrapT = GL_REPEAT;
break;
default:
assert(0);
}
glTexParameteri(m_target, GL_TEXTURE_WRAP_S, wrapS);
glTexParameteri(m_target, GL_TEXTURE_WRAP_T, wrapS);
glTexParameteri(m_target, GL_TEXTURE_MAG_FILTER, magFilter);
glTexParameteri(m_target, GL_TEXTURE_MIN_FILTER, minFilter);
glDisable(m_target);
}
TextureGL::TextureGL(const TextureDescriptor &descriptor, const bool useCompressed) :
Texture(descriptor), m_target(GL_TEXTURE_2D) // XXX don't force target
{
glGenTextures(1, &m_texture);
glBindTexture(m_target, m_texture);
glEnable(m_target);
// useCompressed is the global scope flag whereas descriptor.allowCompression is the local texture mode flag
// either both or neither might be true however only compress the texture when both are true.
const bool compressTexture = useCompressed && descriptor.allowCompression;
switch (m_target) {
case GL_TEXTURE_2D:
if (descriptor.generateMipmaps)
glTexParameteri(m_target, GL_GENERATE_MIPMAP, GL_TRUE);
glTexImage2D(
m_target, 0, compressTexture ? GLCompressedTextureFormat(descriptor.format) : GLTextureFormat(descriptor.format),
descriptor.dataSize.x, descriptor.dataSize.y, 0,
GLImageFormatForTextureFormat(descriptor.format),
GLImageTypeForTextureFormat(descriptor.format), 0);
break;
default:
assert(0);
}
GLenum magFilter, minFilter, wrapS, wrapT;
switch (descriptor.sampleMode) {
case LINEAR_CLAMP:
magFilter = GL_LINEAR;
minFilter = descriptor.generateMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
wrapS = wrapT = GL_CLAMP_TO_EDGE;
break;
case NEAREST_CLAMP:
magFilter = GL_NEAREST;
minFilter = descriptor.generateMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
wrapS = wrapT = GL_CLAMP_TO_EDGE;
break;
case LINEAR_REPEAT:
magFilter = GL_LINEAR;
minFilter = descriptor.generateMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
wrapS = wrapT = GL_REPEAT;
break;
case NEAREST_REPEAT:
magFilter = GL_NEAREST;
minFilter = descriptor.generateMipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST;
wrapS = wrapT = GL_REPEAT;
break;
default:
assert(0);
}
glTexParameteri(m_target, GL_TEXTURE_WRAP_S, wrapS);
glTexParameteri(m_target, GL_TEXTURE_WRAP_T, wrapS);
glTexParameteri(m_target, GL_TEXTURE_MAG_FILTER, magFilter);
glTexParameteri(m_target, GL_TEXTURE_MIN_FILTER, minFilter);
glDisable(m_target);
}
