Fixed the game being upside down sometimes

Weird bug that would only happen for some people and only in desktop.
Still not sure exactly what conditions cause it, but it should be fixed with this.

Cancerspace.shader

@@ -203,7 +203,7 @@
 				float4 pos : SV_POSITION;
 				float3 posWorld : TEXCOORD0;
 				float4 projPos : TEXCOORD1;
-				float4 posOrigin : TEXCOORD2;
+				float4 depthPos : TEXCOORD2;
 				float3 cubemapSampler : TEXCOORD3;
 				float4 uv : TEXCOORD4;
 				float4 worldDir : TEXCOORD5;
@@ -416,7 +416,8 @@
 
 				o.posWorld = mul(unity_ObjectToWorld, v.vertex).xyz;
 				float4 vertexIntended = UnityObjectToClipPos(v.vertex);
-				o.projPos = ComputeScreenPos(vertexIntended);
+				o.projPos = ComputeGrabScreenPos(vertexIntended);
+				o.depthPos = ComputeScreenPos(vertexIntended);
 				o.worldDir.xyz = o.posWorld - _WorldSpaceCameraPos;
 				o.worldDir.w = dot(vertexIntended, CalculateFrustumCorrection());
 
@@ -448,8 +449,6 @@
 				}
 
 				o.pos = UnityViewToClipPos(viewPos);
-				o.posOrigin = ComputeScreenPos(UnityObjectToClipPos(float4(0,0,0,1)));
-				o.posOrigin.xy /= o.posOrigin.w;
 				o.cubemapSampler = rotateXYZ(o.posWorld - _WorldSpaceCameraPos, _OverlayCubemapRotation + fmod(_Time.y * _OverlayCubemapSpeed, 360));
 
 				o.uv.xy = v.uv.xy;
@@ -466,7 +465,7 @@
 				float effectDistance = i.uv.z;
 				float particleAge01 = i.uv.w;
 
-				float depth = calculateCameraDepth(i.projPos.xy, i.worldDir, rcp(i.pos.w));
+				float depth = calculateCameraDepth(i.depthPos.xy, i.worldDir, rcp(i.pos.w));
 
 				float VRFix = 1;
 				#if defined(USING_STEREO_MATRICES)
@@ -495,11 +494,13 @@
 
 				float2 grabUV = _ScreenReprojection ? screenSpaceOverlayUV : (i.projPos.xy / i.projPos.w);
 
-				if (distance(i.posOrigin.xy, saturate(i.posOrigin.xy)) == 0) {
-					grabUV -= i.posOrigin.xy;
+				float3 originPos = ComputeGrabScreenPos(UnityObjectToClipPos(float4(0,0,0,1))).xyw;
+				originPos.xy /= originPos.z;
+				if (distance(originPos.xy, saturate(originPos.xy)) == 0) {
+					grabUV -= originPos.xy;
 					_Zoom = lerp(1, _Zoom, saturate(-dot(normalize(viewVec), UNITY_MATRIX_V[2].xyz)));
 					grabUV *= lerp(1, _Zoom, allAmp);
-					grabUV += i.posOrigin.xy;
+					grabUV += originPos.xy;
 				}
 				_Pixelation *= allAmp;
 				if (_Pixelation > 0) grabUV = floor(grabUV / _Pixelation) * _Pixelation;