Fix case 1046713 - Planar reflection are black when viewing in the direction of the normal of the mirror for infinite projections.

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightLoop/LightLoop.cs

                     out worldToCamera, out projection, out capturePosition, out captureRotation,
                     camera);
 
-                var gpuProj = GL.GetGPUProjectionMatrix(projection, true); // Had to change this from 'false'
-                var vp = gpuProj * gpuView * Matrix4x4.Translate(capturePosition);
+                // Provide non device dependent projection matrix (clip space range is [-1..1]^3)
+                var vp = projection * gpuView * Matrix4x4.Translate(capturePosition);
                 m_Env2DCaptureVP[fetchIndex] = vp;
             }
             else if (probe.reflectionProbe != null)

com.unity.render-pipelines.high-definition/HDRP/Lighting/LightLoop/LightLoopDef.hlsl

     {
         if (cacheType == ENVCACHETYPE_TEXTURE2D)
         {
-            //_Env2DCaptureVP is in capture space
-            float3 ndc = ComputeNormalizedDeviceCoordinatesWithZ(texCoord, _Env2DCaptureVP[index]);
+            // _Env2DCaptureVP transform from this camera view space to capture camera clip space.
+            // And it uses a non device dependent projection matrix (clip space range is [-1..1]^3)
+            float4 positionCS = mul(_Env2DCaptureVP[index], float4(texCoord, 1.0));
+            float3 ndc = (positionCS.xyz * rcp(positionCS.w)) * 0.5 + 0.5;
-            color.a = any(ndc.xyz < 0) || any(ndc.xyz > 1) ? 0.0 : 1.0;
+            // Clip against oblique near clip plane and side clip planes.
+            // Don't clip against far clip plane to handle properly infinite projection.
+            color.a = any(ndc.xyz < 0) || any(ndc.xy > 1) ? 0.0 : 1.0;
         }
         else if (cacheType == ENVCACHETYPE_CUBEMAP)
         {