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

#include "spritebatch.h"
#include "assert/assert.h"
#include "util/memory.h"
#include "console/console.h"

spritebatch_t SPRITEBATCH;

void spriteBatchInit() {
  SPRITEBATCH.spriteCount = 0;
  SPRITEBATCH.currentTexture = NULL;
  
  meshInit(
    &SPRITEBATCH.mesh,
    GL_TRIANGLES,
    SPRITEBATCH_VERTEX_COUNT,
    &SPRITEBATCH.vertices[0]
  );
}

void spriteBatchPush(
  texture_t *texture,
  const float_t minX,
  const float_t minY,
  const float_t maxX,
  const float_t maxY,
  const uint8_t r,
  const uint8_t g,
  const uint8_t b,
  const uint8_t a,
  const float_t u0,
  const float_t v0,
  const float_t u1,
  const float_t v1
) {
  // Need to flush?
  if(
    SPRITEBATCH.currentTexture != texture ||
    SPRITEBATCH.spriteCount >= SPRITEBATCH_SPRITES_MAX
  ) {
    spriteBatchFlush();
    SPRITEBATCH.currentTexture = texture;
  }

  quadBuffer(
    &SPRITEBATCH.vertices[SPRITEBATCH.spriteCount * QUAD_VERTEX_COUNT],
    minX, minY, maxX, maxY,
    r, g, b, a,
    u0, v0, u1, v1
  );

  SPRITEBATCH.spriteCount++;
}

void spriteBatchClear() {
  SPRITEBATCH.spriteCount = 0;
  SPRITEBATCH.currentTexture = NULL;
}

void spriteBatchFlush() {
  if(SPRITEBATCH.spriteCount == 0) return;
  textureBind(SPRITEBATCH.currentTexture);
  meshDraw(&SPRITEBATCH.mesh, 0, QUAD_VERTEX_COUNT * SPRITEBATCH.spriteCount);
  spriteBatchClear();
}

void spriteBatchDispose() {
  meshDispose(&SPRITEBATCH.mesh);
}