Generate correct indices for g_vBoundsBuffer

The mins/maxs are separeted, so we need to generate correct index data.

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/lightlistbuild-clustered.compute

 	for(int l=(int) t; l<(int) g_iNrVisibLights; l += NR_THREADS)
 	{
 #endif
-        // XRTODO: Once we have our light index (l), we need to make sure it indexes the 
+        // XRTODO - DONE: Once we have our light index (l), we need to make sure it indexes the 
-		const float2 vMi = g_vBoundsBuffer[l].xy;
-		const float2 vMa = g_vBoundsBuffer[l+g_iNrVisibLights].xy;
+        const ScreenSpaceBoundsIndices boundsIndices = GenerateScreenSpaceBoundsIndices(l, g_iNrVisibLights, eyeIndex);
+        const float2 vMi = g_vBoundsBuffer[boundsIndices.min].xy;
+        const float2 vMa = g_vBoundsBuffer[boundsIndices.max].xy;
 
 		if( all(vMa>vTileLL) && all(vMi<vTileUR))
 		{
 
 		for(int l=(int) t; l<((iNrCoarseLights+1)>>1); l += NR_THREADS)
 		{
-            // XRTODO: Stereo-ize access to g_vBoundsBuffer, run l0 and l1 through GenerateScreenSpaceBoundsIndices
+            // XRTODO - DONE: Stereo-ize access to g_vBoundsBuffer, run l0 and l1 through GenerateScreenSpaceBoundsIndices
+            const ScreenSpaceBoundsIndices l0Bounds = GenerateScreenSpaceBoundsIndices(l0, g_iNrVisibLights, eyeIndex);
+            const ScreenSpaceBoundsIndices l1Bounds = GenerateScreenSpaceBoundsIndices(l1, g_iNrVisibLights, eyeIndex);
-            const unsigned int clustIdxMi0 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l0].z, eyeIndex), suggestedBase));
-            const unsigned int clustIdxMa0 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l0 + g_iNrVisibLights].z, eyeIndex), suggestedBase));
-            const unsigned int clustIdxMi1 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l1].z, eyeIndex), suggestedBase));
-            const unsigned int clustIdxMa1 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l1 + g_iNrVisibLights].z, eyeIndex), suggestedBase));
+            const unsigned int clustIdxMi0 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l0Bounds.min].z, eyeIndex), suggestedBase));
+            const unsigned int clustIdxMa0 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l0Bounds.max].z, eyeIndex), suggestedBase));
+            const unsigned int clustIdxMi1 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l1Bounds.min].z, eyeIndex), suggestedBase));
+            const unsigned int clustIdxMa1 = (const unsigned int)min(255, SnapToClusterIdx(GetLinearDepth(g_vBoundsBuffer[l1Bounds.max].z, eyeIndex), suggestedBase));
 			clusterIdxs[l] = (clustIdxMa1<<24) | (clustIdxMi1<<16) | (clustIdxMa0<<8) | (clustIdxMi0<<0);
 		}
 	}