/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#pragma once
#include "display/texture/texture.h"

#define FRAMEBUFFER_CLEAR_COLOR (1 << 0)
#define FRAMEBUFFER_CLEAR_DEPTH (1 << 1)

typedef struct {
  #if DISPLAY_SDL2 == 1
    // OpenGL Framebuffer Object ID
    GLuint id;
    texture_t texture;
  #else
    #error "Framebuffers not implemented on this platform."
  #endif
} framebuffer_t;

extern framebuffer_t FRAMEBUFFER_BACKBUFFER;
extern const framebuffer_t *FRAMEBUFFER_BOUND;

/**
 * Initializes the backbuffer framebuffer.
 */
void frameBufferInitBackbuffer(void);

/**
 * Initializes a framebuffer.
 * 
 * @param framebuffer The framebuffer to initialize.
 * @param width The width of the framebuffer.
 * @param height The height of the framebuffer.
 */
#if DISPLAY_SIZE_DYNAMIC == 1
  void frameBufferInit(
    framebuffer_t *framebuffer,
    const uint32_t width,
    const uint32_t height
  );
#endif

/**
 * Gets the width of the framebuffer.
 * 
 * @param framebuffer The framebuffer to get the width of.
 * @return The width of the framebuffer, or 0 if the framebuffer is NULL.
 */
int32_t frameBufferGetWidth(const framebuffer_t *framebuffer);

/**
 * Gets the height of the framebuffer.
 * 
 * @param framebuffer The framebuffer to get the height of.
 * @return The height of the framebuffer, or 0 if the framebuffer is NULL.
 */
int32_t frameBufferGetHeight(const framebuffer_t *framebuffer);

/**
 * Binds the framebuffer for rendering, or the backbuffer if the framebuffer 
 * provided is NULL.
 * 
 * @param framebuffer The framebuffer to bind, or NULL to bind the backbuffer.
 */
void frameBufferBind(const framebuffer_t *framebuffer);

/**
 * Clears the currently bound framebuffer.
 * 
 * @param flags The clear flags.
 * @param color The color to clear the color buffer to (if clearing color).
 */
void frameBufferClear(uint8_t flags, color_t color);

/**
 * Disposes of the framebuffer using EXT methods.
 * 
 * @param framebuffer The framebuffer to dispose of.
 */
void frameBufferDispose(framebuffer_t *framebuffer);

// #if RENDER_USE_FRAMEBUFFER
//   typedef struct {
//     GLuint id;
//     texture_t texture;
//   } framebuffer_t;

//   /**
//    * Initializes a framebuffer using EXT methods.
//    * 
//    * @param framebuffer The framebuffer to initialize.
//    * @param width The width of the framebuffer.
//    * @param height The height of the framebuffer.
//    * @return An error code indicating success or failure.
//    */
//   void frameBufferInit(
//     framebuffer_t *framebuffer,
//     const uint32_t width,
//     const uint32_t height
//   );

// #endif