GLImage.hh

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#ifndef GLTEXTURE_HH
#define GLTEXTURE_HH
 
#include "GLUtil.hh"
#include "gl_vec.hh"
#include <array>
#include <cstdint>
#include <span>
#include <string>
 
class SDLSurfacePtr;
 
namespace openmsx {
 
// TODO does this belong here or in GLUtil?
gl::Texture loadTexture(const std::string& filename, gl::ivec2& size);
 
class GLImage
{
public:
        explicit GLImage(const std::string& filename);
        explicit GLImage(SDLSurfacePtr image);
        GLImage(const std::string& filename, float scaleFactor);
        GLImage(const std::string& filename, gl::ivec2 size);
        GLImage(gl::ivec2 size, uint32_t rgba);
        GLImage(gl::ivec2 size, std::span<const uint32_t, 4> rgba,
                int borderSize, uint32_t borderRGBA);
 
        void draw(gl::ivec2 pos, uint8_t alpha = 255) {
                draw(pos, 255, 255, 255, alpha);
        }
        void draw(gl::ivec2 pos,
                  uint8_t r, uint8_t g, uint8_t b, uint8_t alpha);
 
        [[nodiscard]] gl::ivec2 getSize() const { return size; }
 
        static void checkSize(gl::ivec2 size);
 
private:
        void initBuffers();
 
private:
        gl::ivec2 size;
        std::array<gl::BufferObject, 3> vbo;
        gl::BufferObject elementsBuffer;
        gl::Texture texture{gl::Null()}; // must come after size
        int borderSize{0};
        std::array<uint16_t, 4> bgA; // 0..256
        uint16_t borderA{0}; // 0..256
        std::array<uint8_t, 4> bgR, bgG, bgB;
        uint8_t borderR{0}, borderG{0}, borderB{0};
};
 
} // namespace openmsx
 
#endif