[fptl, hd] gbuffer sizes are no longer implicit

passing -1 for width/height relies on there being an active camera,
which is no longer a thing

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs

                 sRGBWrites[index] = inSRGBWrite;
             }
 
-            public void InitGBuffers(CommandBuffer cmd)
+            public void InitGBuffers(int width, int height, CommandBuffer cmd)
-                    /* RTs[index] = */ cmd.GetTemporaryRT(IDs[index], -1, -1, 0, FilterMode.Point, formats[index], sRGBWrites[index]);
+                    /* RTs[index] = */ cmd.GetTemporaryRT(IDs[index], width, height, 0, FilterMode.Point, formats[index], sRGBWrites[index]);
                 }
             }
 
                 // Also we manage ourself the HDR format, here allocating fp16 directly.
                 // With scriptable render loop we can allocate temporary RT in a command buffer, they will not be release with ExecuteCommandBuffer
                 // These temporary surface are release automatically at the end of the scriptable renderloop if not release explicitly
-                cmd.GetTemporaryRT(s_CameraColorBuffer, -1, -1, 0, FilterMode.Point, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Default);
-                cmd.GetTemporaryRT(s_CameraDepthBuffer, -1, -1, 24, FilterMode.Point, RenderTextureFormat.Depth);
-                gbufferManager.InitGBuffers(cmd);
+                int w = camera.pixelWidth;
+                int h = camera.pixelHeight;
+
+                cmd.GetTemporaryRT(s_CameraColorBuffer, w, h, 0, FilterMode.Point, RenderTextureFormat.ARGBHalf, RenderTextureReadWrite.Default);
+                cmd.GetTemporaryRT(s_CameraDepthBuffer, w, h, 24, FilterMode.Point, RenderTextureFormat.Depth);
+                gbufferManager.InitGBuffers(w, h, cmd);
 
                 cmd.SetRenderTarget(new RenderTargetIdentifier(s_CameraColorBuffer), new RenderTargetIdentifier(s_CameraDepthBuffer));
                 cmd.ClearRenderTarget(true, false, new Color(0, 0, 0, 0));

Assets/ScriptableRenderLoop/fptl/FptlLighting.cs

             }
 		}
 
-		static void SetupGBuffer(CommandBuffer cmd)
+		static void SetupGBuffer(int width, int height, CommandBuffer cmd)
+
-			cmd.GetTemporaryRT(kGBufferAlbedo, -1, -1, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
-			cmd.GetTemporaryRT(kGBufferSpecRough, -1, -1, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
-			cmd.GetTemporaryRT(kGBufferNormal, -1, -1, 0, FilterMode.Point, format10, RenderTextureReadWrite.Linear);
-			cmd.GetTemporaryRT(kGBufferEmission, -1, -1, 0, FilterMode.Point, format10, RenderTextureReadWrite.Linear); //@TODO: HDR
-			cmd.GetTemporaryRT(kGBufferZ, -1, -1, 24, FilterMode.Point, RenderTextureFormat.Depth);
-			cmd.GetTemporaryRT(kCameraDepthTexture, -1, -1, 24, FilterMode.Point, RenderTextureFormat.Depth);
+			cmd.GetTemporaryRT(kGBufferAlbedo, width, height, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
+			cmd.GetTemporaryRT(kGBufferSpecRough, width, height, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
+			cmd.GetTemporaryRT(kGBufferNormal, width, height, 0, FilterMode.Point, format10, RenderTextureReadWrite.Linear);
+			cmd.GetTemporaryRT(kGBufferEmission, width, height, 0, FilterMode.Point, format10, RenderTextureReadWrite.Linear); //@TODO: HDR
+			cmd.GetTemporaryRT(kGBufferZ, width, height, 24, FilterMode.Point, RenderTextureFormat.Depth);
+			cmd.GetTemporaryRT(kCameraDepthTexture, width, height, 24, FilterMode.Point, RenderTextureFormat.Depth);
-			cmd.GetTemporaryRT(kCameraTarget, -1, -1, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
+			cmd.GetTemporaryRT(kCameraTarget, width, height, 0, FilterMode.Point, RenderTextureFormat.DefaultHDR, RenderTextureReadWrite.Default);
 
 			var colorMRTs = new RenderTargetIdentifier[4] { kGBufferAlbedo, kGBufferSpecRough, kGBufferNormal, kGBufferEmission };
 			cmd.SetRenderTarget(colorMRTs, new RenderTargetIdentifier(kGBufferZ));
 			// setup GBuffer for rendering
 			var cmd = new CommandBuffer();
 			cmd.name = "Create G-Buffer";
-			SetupGBuffer(cmd);
+			SetupGBuffer(camera.pixelWidth, camera.pixelHeight, cmd);
 			loop.ExecuteCommandBuffer(cmd);
 			cmd.Dispose();