OpenGLTexture::OpenGLTexture(const Graphics::Surface *surface) {
width = surface->w;
height = surface->h;
format = surface->format;
internalHeight = upperPowerOfTwo(height);
internalWidth = upperPowerOfTwo(width);
if (format.bytesPerPixel == 4) {
internalFormat = GL_RGBA;
sourceFormat = GL_UNSIGNED_BYTE;
} else if (format.bytesPerPixel == 3) {
internalFormat = GL_RGB;
sourceFormat = GL_UNSIGNED_BYTE;
} else if (format.bytesPerPixel == 2) {
internalFormat = GL_RGB;
sourceFormat = GL_UNSIGNED_SHORT_5_6_5;
} else
error("Unknown pixel format");
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, sourceFormat, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
update(surface);
}
OpenGLTexture::OpenGLTexture(const Graphics::Surface *surface, bool nonPoTSupport) :
_unpackSubImageSupport(true) {
width = surface->w;
height = surface->h;
format = surface->format;
// Pad the textures if non power of two support is unavailable
if (nonPoTSupport) {
internalHeight = height;
internalWidth = width;
} else {
internalHeight = upperPowerOfTwo(height);
internalWidth = upperPowerOfTwo(width);
}
if (format.bytesPerPixel == 4) {
internalFormat = GL_RGBA;
#if defined(USE_GLES2)
sourceFormat = GL_UNSIGNED_BYTE;
#else
sourceFormat = GL_UNSIGNED_INT_8_8_8_8_REV;
#endif
} else if (format.bytesPerPixel == 2) {
internalFormat = GL_RGB;
sourceFormat = GL_UNSIGNED_SHORT_5_6_5;
} else
error("Unknown pixel format");
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, internalWidth, internalHeight, 0, internalFormat, sourceFormat, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// TODO: If non power of two textures are unavailable this clamping
// has no effect on the padded sides (resulting in white lines on the edges)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
update(surface);
}
