[UI] UI common shaders to XeSL

src/xenia/ui/shaders/guest_output_ffx_fsr_rcas.xesli

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+/**
+ ******************************************************************************
+ * 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 "xesl.xesli"
+
+#include "amd_language.xesli"
+
+#if XE_GUEST_OUTPUT_DITHER
+  #include "dither_8bpc.xesli"
+#endif  // XE_GUEST_OUTPUT_DITHER
+
+xesl_push_constants_begin(b0, space0)
+  // 16 used by the vertex shader (GLSL push constant offsets are across
+  // stages).
+  xesl_block_offset_member(16, c0.x, xesl_int2,
+                           xe_fsr_rcas_output_offset)
+  xesl_block_offset_member(24, c0.z, float, xe_fsr_rcas_sharpness_post_setup)
+xesl_push_constants_end
+
+// Forward declaration because FsrRcasLoadF needs xe_fsr_rcas_source from the
+// entry point bindings.
+void FsrRcasF(out float pixel_r, out float pixel_g, out float pixel_b,
+              xesl_uint2 pixel_position, xesl_uint4 constants);
+
+xesl_entry
+  xesl_fetchSampler(xesl_sampler2D, xe_fsr_rcas_source, set=0, binding=0, t0,
+                    space0)
+xesl_entry_bindings_end
+  xesl_input_frag_coord
+  xesl_entry_signature_next
+  xesl_output_color(xesl_float4, xe_fsr_rcas_color, 0)
+xesl_entry_signature_end
+  xesl_uint2 pixel_coord =
+      xesl_uint2(xesl_int2(xesl_FragCoord.xy) -
+                 xesl_push_constant(xe_fsr_rcas_output_offset));
+  float sharpness = xesl_push_constant(xe_fsr_rcas_sharpness_post_setup);
+  // FsrRcasCon with smaller push constant usage.
+  xesl_uint4 rcas_const =
+      xesl_uint4(xesl_floatBitsToUint(sharpness),
+                 xesl_packHalf2x16(xesl_float2(sharpness, sharpness)), 0u, 0u);
+  FsrRcasF(xe_fsr_rcas_color.r, xe_fsr_rcas_color.g, xe_fsr_rcas_color.b,
+           pixel_coord, rcas_const);
+  #if XE_GUEST_OUTPUT_DITHER
+    // Clamping because on Vulkan, the surface may specify any format, including
+    // floating-point.
+    xe_fsr_rcas_color.rgb =
+        xesl_saturate(xe_fsr_rcas_color.rgb + XeDitherOffset8bpc(pixel_coord));
+  #endif  // XE_GUEST_OUTPUT_DITHER
+  // Force alpha to 1 to make sure the surface won't be translucent.
+  xe_fsr_rcas_color.a = 1.0;
+xesl_entry_end
+
+#define A_GPU 1
+#include "../../../../third_party/FidelityFX-FSR/ffx-fsr/ffx_a.h"
+#define FSR_RCAS_F 1
+xesl_float4 FsrRcasLoadF(xesl_int2 p) {
+  return xesl_float4(xesl_texelFetch2D_comb(xe_fsr_rcas_source, p, 0).rgb, 1.0);
+}
+void FsrRcasInputF(inout float r, inout float g, inout float b) {}
+#include "../../../../third_party/FidelityFX-FSR/ffx-fsr/ffx_fsr1.h"