/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2014 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#ifndef XENIA_GPU_TEXTURE_INFO_H_
#define XENIA_GPU_TEXTURE_INFO_H_

#include <xenia/gpu/ucode.h>
#include <xenia/gpu/xenos.h>

namespace xe {
namespace gpu {

// a2xx_sq_surfaceformat
enum class TextureFormat : uint32_t {
  k_1_REVERSE = 0,
  k_1 = 1,
  k_8 = 2,
  k_1_5_5_5 = 3,
  k_5_6_5 = 4,
  k_6_5_5 = 5,
  k_8_8_8_8 = 6,
  k_2_10_10_10 = 7,
  k_8_A = 8,
  k_8_B = 9,
  k_8_8 = 10,
  k_Cr_Y1_Cb_Y0 = 11,
  k_Y1_Cr_Y0_Cb = 12,
  // ? hole
  k_8_8_8_8_A = 14,
  k_4_4_4_4 = 15,
  k_10_11_11 = 16,
  k_11_11_10 = 17,
  k_DXT1 = 18,
  k_DXT2_3 = 19,
  k_DXT4_5 = 20,
  // ? hole
  k_24_8 = 22,
  k_24_8_FLOAT = 23,
  k_16 = 24,
  k_16_16 = 25,
  k_16_16_16_16 = 26,
  k_16_EXPAND = 27,
  k_16_16_EXPAND = 28,
  k_16_16_16_16_EXPAND = 29,
  k_16_FLOAT = 30,
  k_16_16_FLOAT = 31,
  k_16_16_16_16_FLOAT = 32,
  k_32 = 33,
  k_32_32 = 34,
  k_32_32_32_32 = 35,
  k_32_FLOAT = 36,
  k_32_32_FLOAT = 37,
  k_32_32_32_32_FLOAT = 38,
  k_32_AS_8 = 39,
  k_32_AS_8_8 = 40,
  k_16_MPEG = 41,
  k_16_16_MPEG = 42,
  k_8_INTERLACED = 43,
  k_32_AS_8_INTERLACED = 44,
  k_32_AS_8_8_INTERLACED = 45,
  k_16_INTERLACED = 46,
  k_16_MPEG_INTERLACED = 47,
  k_16_16_MPEG_INTERLACED = 48,
  k_DXN = 49,
  k_8_8_8_8_AS_16_16_16_16 = 50,
  k_DXT1_AS_16_16_16_16 = 51,
  k_DXT2_3_AS_16_16_16_16 = 52,
  k_DXT4_5_AS_16_16_16_16 = 53,
  k_2_10_10_10_AS_16_16_16_16 = 54,
  k_10_11_11_AS_16_16_16_16 = 55,
  k_11_11_10_AS_16_16_16_16 = 56,
  k_32_32_32_FLOAT = 57,
  k_DXT3A = 58,
  k_DXT5A = 59,
  k_CTX1 = 60,
  k_DXT3A_AS_1_1_1_1 = 61,

  kUnknown = 0xFFFFFFFFu,
};

struct TextureInfo {
  uint32_t swizzle;
  Dimension dimension;
  uint32_t width;
  uint32_t height;
  uint32_t depth;
  uint32_t block_size;
  uint32_t texel_pitch;
  xenos::Endian endianness;
  bool is_tiled;
  bool is_compressed;
  uint32_t input_length;

  TextureFormat format;

  union {
    struct {
      uint32_t width;
    } size_1d;
    struct {
      uint32_t logical_width;
      uint32_t logical_height;
      uint32_t block_width;
      uint32_t block_height;
      uint32_t input_width;
      uint32_t input_height;
      uint32_t output_width;
      uint32_t output_height;
      uint32_t logical_pitch;
      uint32_t input_pitch;
    } size_2d;
    struct {
    } size_3d;
    struct {
    } size_cube;
  };

  static bool Prepare(const xenos::xe_gpu_texture_fetch_t& fetch,
                      TextureInfo* out_info);

  static uint32_t TiledOffset2DOuter(uint32_t y, uint32_t width,
                                     uint32_t log_bpp);
  static uint32_t TiledOffset2DInner(uint32_t x, uint32_t y, uint32_t bpp,
                                     uint32_t base_offset);

 private:
  void CalculateTextureSizes1D(const xenos::xe_gpu_texture_fetch_t& fetch);
  void CalculateTextureSizes2D(const xenos::xe_gpu_texture_fetch_t& fetch);
};

}  // namespace gpu
}  // namespace xe

#endif  // XENIA_GPU_TEXTURE_INFO_H_