/**
 ******************************************************************************
 * 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 "edram.xesli"
#include "host_depth_store.xesli"

xesl_entry
  xesl_writeTypedStorageBuffer(xesl_uint4, xe_host_depth_store_dest, set=0,
                               binding=0, u0, space0)
  xesl_entry_binding_next
  xesl_texture(xesl_texture2D, xe_host_depth_store_source, set=1, binding=0, t0,
               space0)
xesl_entry_bindings_end_local_size(8, 8, 1)
  xesl_input_global_invocation_id
xesl_entry_signature_end
  // 1 thread = 8 samples (same as resolve granularity).
  // Group height can't cross resolve granularity, Y overflow check not needed.
  xesl_dont_flatten
  if (xesl_GlobalInvocationID.x >= XeHostDepthStoreScaledWidthDiv8()) {
    return;
  }
  xesl_int2 pixel_index =
      xesl_int2(XeHostDepthStoreScaledOrigin() +
                (xesl_GlobalInvocationID.xy << xesl_uint2(3u, 0u)));
  uint edram_address_int4s =
      XeEdramOffsetInts(xesl_uint2(pixel_index), 0u,
                        XeHostDepthStorePitchTiles(), kXenosMsaaSamples_1X,
                        false, 0u, 0u, XeHostDepthStoreResolutionScale())
      >> 2u;
  xesl_writeTypedStorageBufferStore(
      xe_host_depth_store_dest, edram_address_int4s,
      xesl_floatBitsToUint(xesl_float4(
          xesl_texelFetch2D(xe_host_depth_store_source, pixel_index, 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(1, 0), 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(2, 0), 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(3, 0), 0).r)));
  xesl_writeTypedStorageBufferStore(
      xe_host_depth_store_dest, edram_address_int4s + 1u,
      xesl_floatBitsToUint(xesl_float4(
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(4, 0), 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(5, 0), 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(6, 0), 0).r,
          xesl_texelFetch2D(xe_host_depth_store_source,
                            pixel_index + xesl_int2(7, 0), 0).r)));
xesl_entry_end