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#pragma once
#ifndef DOXYGEN_GENERATING_OUTPUT
#define NCINE_INCLUDE_OPENGL
#include "../CommonHeaders.h"
#endif
#include "../../Main.h"
namespace nCine
{
/// Texture format
class TextureFormat
{
public:
TextureFormat() : internalFormat_(-1), format_(-1), type_(-1), isCompressed_(false) {}
explicit TextureFormat(GLenum internalFormat);
TextureFormat(GLenum internalFormat, GLenum type);
/// Returns the specified internal format
inline GLenum internalFormat() const {
return internalFormat_;
}
/// Returns the corresponding format
inline GLenum format() const {
return format_;
}
/// Returns the corresponding pixel data type
inline GLenum type() const {
return type_;
}
/// Returns `true` if the format holds compressed data
inline bool isCompressed() const {
return isCompressed_;
}
/// Returns the number of color channels
std::uint32_t numChannels() const;
/// Converts the external format to the corresponding BGR one
void bgrFormat();
/// Calculates the pixel data size for each MIP map level
static std::uint32_t calculateMipSizes(GLenum internalFormat, std::int32_t width, std::int32_t height, std::int32_t mipMapCount, std::uint32_t* mipDataOffsets, std::uint32_t* mipDataSizes);
private:
GLenum internalFormat_;
GLenum format_;
GLenum type_;
bool isCompressed_;
/// Searches a match between an integer internal format and an external one
bool integerFormat();
/// Searches a match between a non integer internal format and an external one
bool nonIntegerFormat();
/// Searches a match between a floating point internal format and an external one
bool floatFormat();
/// Searches a match between a compressed internal format and an external one
bool compressedFormat();
#if defined(WITH_OPENGLES)
/// Searches a match between an OpenGL ES compressed internal format and an external one
bool oesCompressedFormat();
#endif
/// Attempts to find a match between an external format and the corresponding internal one
void findExternalFormat();
/// Checks if the internal format is supported by the GPU
void checkFormatSupport() const;
};
}
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