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

#include "framebuffer.h"
#include "assert/assert.h"
#include "util/memory.h"

#if RENDER_USE_FRAMEBUFFER
  void frameBufferInit(
    framebuffer_t *framebuffer,
    const uint32_t width,
    const uint32_t height
  ) {
    assertNotNull(framebuffer, "Framebuffer cannot be NULL");
    assertTrue(width > 0 && height > 0, "Width & height must be greater than 0");

    memoryZero(framebuffer, sizeof(framebuffer_t));
    textureInit(&framebuffer->texture, width, height, NULL);

    // Generate the framebuffer object using EXT
    glGenFramebuffersEXT(1, &framebuffer->id);
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);

    // Attach the texture to the framebuffer
    glFramebufferTexture2DEXT(
      GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
      GL_TEXTURE_2D, framebuffer->texture.id, 0
    );

    // Check if the framebuffer is complete
    if(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) != GL_FRAMEBUFFER_COMPLETE_EXT) {
      assertUnreachable("Framebuffer is not complete");
    }

    // Unbind the framebuffer
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
  }

  void frameBufferBind(const framebuffer_t *framebuffer) {
    if(framebuffer == NULL) {
      glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
      return;
    }

    // Bind the framebuffer for rendering
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, framebuffer->id);
  }

  void frameBufferDispose(framebuffer_t *framebuffer) {
    assertNotNull(framebuffer, "Framebuffer cannot be NULL");

    glDeleteFramebuffersEXT(1, &framebuffer->id);
    textureDispose(&framebuffer->texture);
  }
#endif