Merge pull request #113 from Nickelium/screenspaceshadow

Screenspaceshadow

data/shaders/common_textures.hlsl

@@ -68,10 +68,12 @@ Texture2D tex                    : register(t35);
 Texture2D tex2                   : register(t36);
 Texture2D tex_font_atlas         : register(t37);
 TextureCube tex_reflection_probe : register(t38);
+Texture2DArray tex_sss			 : register(t39);
 
 // Storage
 RWTexture2D<float4> tex_uav                                : register(u0);
 RWTexture2D<float4> tex_uav2                               : register(u1);
 RWTexture2D<float4> tex_uav3                               : register(u2);
 globallycoherent RWStructuredBuffer<uint> g_atomic_counter : register(u3);
 globallycoherent RWTexture2D<float4> tex_uav_mips[12]      : register(u4);
+RWTexture2DArray<float4> tex_uav4                          : register(u5);

data/shaders/light.hlsl

@@ -56,9 +56,10 @@ void mainCS(uint3 thread_id : SV_DispatchThreadID)
         }
 
         // screen space shadows
-        if (is_screen_space_shadows_enabled())
+        int array_slice_index = pass_get_f3_value2().x;
+        if (light_has_shadows() && is_screen_space_shadows_enabled() && array_slice_index != -1)
         {
-            shadow.a = min(shadow.a, ScreenSpaceShadows(surface, light));
+            shadow.a = min(shadow.a, tex_sss[int3(thread_id.xy, array_slice_index)].x);
         }
 
         // ensure that the shadow is as transparent as the material

data/shaders/screen_space_shadows/bend_sss.hlsl

@@ -0,0 +1,67 @@
+/*
+Copyright(c) 2016-2023 Panos Karabelas
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+//= INCLUDES =======================
+#include "../common.hlsl"
+#include "screen_space_shadows.hlsl"
+//==================================
+
+#define WAVE_SIZE 64
+#define SAMPLE_COUNT 60
+#define HARD_SHADOW_SAMPLES 4
+#define FADE_OUT_SAMPLES 8
+
+#include "bend_sss_gpu.hlsl"
+
+[numthreads(WAVE_SIZE, 1, 1)]
+void mainCS
+(
+	uint3 DTid      : SV_DispatchThreadID,
+	uint3 Gid       : SV_GroupID,
+	uint3 GTid      : SV_GroupThreadID,
+	uint groupIndex : SV_GroupIndex
+)
+{
+    // create surface
+    Surface surface;
+    surface.Build(DTid.xy, true, true, true);
+
+    // create light
+    Light light;
+    light.Build(surface);
+
+	DispatchParameters in_parameters;
+	in_parameters.SetDefaults();
+	in_parameters.LightCoordinate        = pass_get_f4_value();          // Values stored in DispatchList::LightCoordinate_Shader by BuildDispatchList()
+	in_parameters.WaveOffset             = pass_get_resolution_in();     // Values stored in DispatchData::WaveOffset_Shader by BuildDispatchList()
+	in_parameters.NearDepthValue         = pass_get_f3_value().x;		 // Set to the Depth Buffer Value for the near clip plane, as determined by renderer projection matrix setup (typically 1).
+	in_parameters.FarDepthValue          = pass_get_f3_value().y;		 // Set to the Depth Buffer Value for the far clip plane, as determined by renderer projection matrix setup (typically 0).
+    in_parameters.ArraySliceIndex        = pass_get_f3_value().z;
+	in_parameters.InvDepthTextureSize    = pass_get_f3_value2().xy;		 // Inverse of the texture dimensions for 'DepthTexture' (used to convert from pixel coordinates to UVs)
+	in_parameters.DepthTexture           = tex;	
+	in_parameters.OutputTexture          = tex_uav4;	
+	in_parameters.PointBorderSampler     = samplers[sampler_point_wrap]; // A point sampler, with Wrap Mode set to Clamp-To-Border-Color (D3D12_TEXTURE_ADDRESS_MODE_BORDER), and Border Color set to "FarDepthValue" (typically zero), or some other far-depth value out of DepthBounds.
+	in_parameters.DebugOutputEdgeMask    = false;			             // Use this to visualize edges, for tuning the 'BilinearThreshold' value.
+	in_parameters.DebugOutputThreadIndex = false;		                 // Debug output to visualize layout of compute threads
+	in_parameters.DebugOutputWaveIndex   = false;			             // Debug output to visualize layout of compute wavefronts, useful to sanity check the Light Coordinate is being computed correctly.
+
+	WriteScreenSpaceShadow(in_parameters, Gid, GTid.x);
+}