#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; }

	/**

	 * Performs a sanity check on image size.

	 * Throws MSXException if width or height is excessively large.

	 * Negative image sizes are valid and flip the image.

	 */

	static void checkSize(gl::ivec2 size);

private:

	void initBuffers() const;

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