chunk 1: core gameplay scripts scenes runtime assets

Assets/Volumetric/Shaders/DeclareDownsampledDepthTexture.hlsl

@@ -0,0 +1,14 @@
+TEXTURE2D_X_FLOAT(_HalfResCameraDepthTexture);
+float4 _HalfResCameraDepthTexture_TexelSize;
+
+// Samples the half resolution camera depth texture and returns the depth considering UNITY_REVERSED_Z.
+float SampleDownsampledSceneDepthConsiderReversedZ(float2 uv)
+{
+	float depth = SAMPLE_TEXTURE2D_X(_HalfResCameraDepthTexture, sampler_PointClamp, UnityStereoTransformScreenSpaceTex(uv)).r;
+
+#if !UNITY_REVERSED_Z
+	depth = lerp(UNITY_NEAR_CLIP_VALUE, 1.0, depth);
+#endif
+
+	return depth;
+}