Add comments

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Common.hlsl

 
 // Z buffer to linear 0..1 depth (0 at near plane, 1 at far plane).
 // Does not correctly handle oblique view frustums.
+// zBufferParam = { (f-n)/n, 1, (f-n)/n*f, 1/f }
 float Linear01DepthFromNear(float depth, float4 zBufferParam)
 {
     return 1.0 / (zBufferParam.x + zBufferParam.y / depth);
 // Does not correctly handle oblique view frustums.
+// zBufferParam = { (f-n)/n, 1, (f-n)/n*f, 1/f }
 float Linear01Depth(float depth, float4 zBufferParam)
 {
     return 1.0 / (zBufferParam.x * depth + zBufferParam.y);
 // Does not correctly handle oblique view frustums.
+// zBufferParam = { (f-n)/n, 1, (f-n)/n*f, 1/f }
 float LinearEyeDepth(float depth, float4 zBufferParam)
 {
     return 1.0 / (zBufferParam.z * depth + zBufferParam.w);
 
 // 'z' is the view-space Z position (linear depth).
 // saturate() the output of the function to clamp them to the [0, 1] range.
+// encodingParams = { n, log2(f/n), 1/n, 1/log2(f/n) }
 float EncodeLogarithmicDepth(float z, float4 encodingParams)
 {
     return log2(max(0, z * encodingParams.z)) * encodingParams.w;
 // saturate(d) to clamp the output of the function to the [n, f] range.
+// encodingParams = { n, log2(f/n), 1/n, 1/log2(f/n) }
 float DecodeLogarithmicDepth(float d, float4 encodingParams)
 {
     return encodingParams.x * exp2(d * encodingParams.y);