/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2022 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#include "endian.xesli"
#include "pixel_formats.xesli"
#define XE_RESOLVE_COPY_EDRAM_IS_UINT_VECTOR_BUFFER
#include "resolve.xesli"

array_buffer_wo_declare_xe(uint2_xe, xe_resolve_dest, set=1, binding=0, u0,
                           space0)
#define LOCAL_SIZE_X_XE 8
#define LOCAL_SIZE_Y_XE 8
#define LOCAL_SIZE_Z_XE 1
entry_bindings_begin_compute_xe
  XE_RESOLVE_PUSH_CONST_BINDING
  entry_binding_next_xe
  array_buffer_wo_binding_xe(uint2_xe, xe_resolve_dest, buffer(1))
  entry_binding_next_xe
  XE_RESOLVE_COPY_EDRAM_BINDING
entry_bindings_end_inputs_begin_compute_xe
  entry_in_global_thread_id_xe
entry_inputs_end_code_begin_compute_xe
{
  // 1 thread = 8 host pixels.
  XeResolveInfo resolve_info = XeResolveGetInfo(pass_push_consts_xe);
  // Group height can't cross resolve granularity, Y overflow check not needed.
  dont_flatten_xe
  if (in_global_thread_id_xe.x >= resolve_info.width_div_8_scaled) {
    return;
  }
  uint2_xe pixel_index = in_global_thread_id_xe.xy << uint2_xe(3u, 0u);
  float4_xe pixels_0123, pixels_4567;
  XeResolveLoad8RedColors(
      pass_uint_vector_buffer_xe(xe_resolve_edram)
      pass_next_after_uint_vector_buffer_xe
      resolve_info,
      XeResolveColorCopySourcePixelAddressIntsYHalfPixelOffsetFilling(
          resolve_info, pixel_index),
      pixels_0123, pixels_4567);
  dont_flatten_xe
  if (pixel_index.x == 0u &&
      resolve_info.half_pixel_offset_fill_source.x != 0u) {
    if (resolve_info.half_pixel_offset_fill_source.x >= 2u) {
      if (resolve_info.half_pixel_offset_fill_source.x >= 3u) {
        pixels_0123.z = pixels_0123.w;
      }
      pixels_0123.y = pixels_0123.z;
    }
    pixels_0123.x = pixels_0123.y;
  }
  // Convert to R8.
  // TODO(Triang3l): Investigate formats 8_A and 8_B.
  array_buffer_store_xe(
      xe_resolve_dest,
      XeResolveDestPixelAddress(resolve_info, pixel_index, 0u) >> 3u,
      uint2_xe(XePackR8G8B8A8UNorm(pixels_0123),
               XePackR8G8B8A8UNorm(pixels_4567)));
}
entry_code_end_compute_xe