Fix SSR shader on D3D10

Source/Shaders/GI/GlobalSurfaceAtlas.hlsl

@@ -3,6 +3,10 @@
 #include "./Flax/Common.hlsl"
 #include "./Flax/Collisions.hlsl"
 
+#if CAN_USE_GATHER
+#define CAN_USE_GLOBAL_SURFACE_ATLAS 1
+#endif
+
 // This must match C++
 #define GLOBAL_SURFACE_ATLAS_CHUNKS_RESOLUTION 40 // Amount of chunks (in each direction) to split atlas draw distance for objects culling
 #define GLOBAL_SURFACE_ATLAS_CHUNKS_GROUP_SIZE 4

Source/Shaders/Gather.hlsl

@@ -70,4 +70,30 @@ float4 TextureGatherRed(Texture2D<float> tex, SamplerState sam, float2 uv, int2
 #endif
 }
 
+float4 TextureGatherGreen(Texture2D tex, SamplerState sam, float2 uv)
+{
+#if CAN_USE_GATHER
+	return tex.GatherGreen(sam, uv);
+#else
+    float x = tex.Sample(sam, uv, int2(0, 1)).g;
+    float y = tex.Sample(sam, uv, int2(1, 1)).g;
+    float z = tex.Sample(sam, uv, int2(1, 0)).g;
+    float w = tex.Sample(sam, uv, int2(0, 0)).g;
+    return float4(x, y, z, w);
+#endif
+}
+
+float4 TextureGatherBlue(Texture2D tex, SamplerState sam, float2 uv)
+{
+#if CAN_USE_GATHER
+	return tex.GatherBlue(sam, uv);
+#else
+    float x = tex.Sample(sam, uv, int2(0, 1)).b;
+    float y = tex.Sample(sam, uv, int2(1, 1)).b;
+    float z = tex.Sample(sam, uv, int2(1, 0)).b;
+    float w = tex.Sample(sam, uv, int2(0, 0)).b;
+    return float4(x, y, z, w);
+#endif
+}
+
 #endif

Source/Shaders/SSR.shader

@@ -134,7 +134,7 @@ float4 PS_RayTracePass(Quad_VS2PS input) : SV_Target0
     float3 reflectWS = ScreenSpaceReflectionDirection(input.TexCoord, gBuffer, gBufferData.ViewPos, TemporalEffect, TemporalTime, BRDFBias);
 
     // Fallback to Global SDF and Global Surface Atlas tracing
-#if USE_GLOBAL_SURFACE_ATLAS
+#if USE_GLOBAL_SURFACE_ATLAS && CAN_USE_GLOBAL_SURFACE_ATLAS
     GlobalSDFTrace sdfTrace;
     float maxDistance = 100000;
     float selfOcclusionBias = GlobalSDF.CascadeVoxelSize[0];