HDRenderPipeline: Fix EOL and shader compil issue for AO

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/AmbientOcclusion/Resources/CommonAmbientOcclusion.hlsl

 float SampleDepth(uint2 unPositionSS)
 {
     float z = LOAD_TEXTURE2D(_CameraDepthTexture, unPositionSS).x;
-    return LinearEyeDepth(z, _ZBufferParams) + CheckBounds(uv, z); // TODO: We should use the stencil to not affect the sky and save CheckBounds cost
+    return LinearEyeDepth(z, _ZBufferParams) + CheckBounds(float2(0.5, 0.5), z); // TODO: We should use the stencil to not affect the sky and save CheckBounds cost - also uv can't be out of bounds on xy... so put a constant here
 }
 
 half3 SampleNormal(BSDFData bsdfData)

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/AmbientOcclusion/Resources/Composition.hlsl

 SAMPLER2D(sampler_MainTex);
 float4 _MainTex_TexelSize;
 
-half4 Frag(Varyings input)
+half4 Frag(Varyings input) : SV_Target0
-    float uv = posInput.positionSS;
+    float2 uv = posInput.positionSS;
 
     float2 delta = _MainTex_TexelSize.xy / _Downsample; // TODO: is it correct, we have already bilateral upsample here ?
 

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/AmbientOcclusion/Resources/Denoising.hlsl

 {
     // input.positionCS is SV_Position
     PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
-    float uv = posInput.positionSS;
+    float2 uv = posInput.positionSS;
 
 #if defined(AO_DENOISE_HORIZONTAL)
 

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/AmbientOcclusion/Resources/Estimation.hlsl

 {
     // input.positionCS is SV_Position
     PositionInputs posInput = GetPositionInput(input.positionCS.xy, _ScreenSize.zw);
-    float uv = posInput.positionSS;
+    float2 uv = posInput.positionSS;
 
     half3 unused;
     BSDFData bsdfData;

Assets/ScriptableRenderPipeline/HDRenderPipeline/Lighting/TilePass/TilePassLoop.hlsl

 {
     LightLoopContext context;
 #ifdef APPLY_AMBIENT_OCCLUSION
-    context.ambientOcclusion = LOAD_TEXTURE2D(_AmbientOcclusionTexture, unPositionSS).x;
+    context.ambientOcclusion = LOAD_TEXTURE2D(_AmbientOcclusionTexture, posInput.unPositionSS).x;
 #else
     context.ambientOcclusion = 1.0;
 #endif
 {
     LightLoopContext context;
 #ifdef APPLY_AMBIENT_OCCLUSION
-    context.ambientOcclusion = LOAD_TEXTURE2D(_AmbientOcclusionTexture, unPositionSS).x;
+    context.ambientOcclusion = LOAD_TEXTURE2D(_AmbientOcclusionTexture, posInput.unPositionSS).x;
 #else
     context.ambientOcclusion = 1.0;
 #endif

Assets/ScriptableRenderPipeline/ShaderLibrary/CommonLighting.hlsl

 // Ref: Moving Frostbite to PBR - Gotanda siggraph 2011
 float GetSpecularOcclusion(float NdotV, float ambientOcclusion, float roughness)
 {
-	return saturate(pow(NdotV + ambientOcclusion, exp2(-16.0 * roughness - 1.0)) - 1.0 + ambientOcclusion);
+	return saturate(PositivePow(NdotV + ambientOcclusion, exp2(-16.0 * roughness - 1.0)) - 1.0 + ambientOcclusion);
 }
 
 //-----------------------------------------------------------------------------

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