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

#include "texture.h"
#include "assert/assert.h"
#include "util/memory.h"
#include "util/math.h"

void textureInit(
  texture_t *texture,
  const int32_t width,
  const int32_t height,
  const GLenum format,
  const uint8_t *data
) {
  assertNotNull(texture, "Texture cannot be NULL");
  assertTrue(width > 0 && height > 0, "Width and height must be greater than 0");

  #if PSP
    assertTrue(
      width == mathNextPowTwo(width),
      "Width must be powers of 2 for PSP"
    );
    assertTrue(
      height == mathNextPowTwo(height),
      "Height must be powers of 2 for PSP"
    );
  #endif

  memoryZero(texture, sizeof(texture_t));
  texture->width = width;
  texture->height = height;

  glGenTextures(1, &texture->id);
  glBindTexture(GL_TEXTURE_2D, texture->id);
  glTexImage2D(
    GL_TEXTURE_2D, 0, format, width, height, 0,
    format, GL_UNSIGNED_BYTE, data
  );

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  
  glBindTexture(GL_TEXTURE_2D, 0);
}

void textureBind(const texture_t *texture) {
  if(texture == NULL) {
    glDisable(GL_TEXTURE_2D);
    // glBindTexture(GL_TEXTURE_2D, 0);
    return;
  }

  assertTrue(
    texture->id != 0,
    "Texture ID must not be 0"
  );
  assertTrue(
    texture->width > 0 && texture->height > 0,
    "Texture width and height must be greater than 0"
  );
  
  glEnable(GL_TEXTURE_2D);
  glBindTexture(GL_TEXTURE_2D, texture->id);
}

void textureDispose(texture_t *texture) {
  assertNotNull(texture, "Texture cannot be NULL");
  assertTrue(texture->id != 0, "Texture ID must not be 0");

  glDeleteTextures(1, &texture->id);
}