Move SSAO pass to be before translucent rendering

Fix depth sampling location when not using fullscreen scene

src/gl/renderer/gl_postprocess.cpp

@@ -177,6 +177,8 @@ void FGLRenderer::AmbientOccludeScene()
 	mLinearDepthShader->LinearizeDepthB[multisample].Set(MAX(1.0f / GetZNear(), 1.e-8f));
 	mLinearDepthShader->InverseDepthRangeA[multisample].Set(1.0f);
 	mLinearDepthShader->InverseDepthRangeB[multisample].Set(0.0f);
+	mLinearDepthShader->Scale[multisample].Set(mSceneViewport.width / (float)mScreenViewport.width, mSceneViewport.height / (float)mScreenViewport.height);
+	mLinearDepthShader->Offset[multisample].Set(mSceneViewport.left / (float)mScreenViewport.width, mSceneViewport.top / (float)mScreenViewport.height);
 	RenderScreenQuad();
 
 	// Apply ambient occlusion
@@ -236,7 +238,6 @@ void FGLRenderer::AmbientOccludeScene()
 	mSSAOCombineShader->Bind();
 	mSSAOCombineShader->AODepthTexture.Set(0);
 	RenderScreenQuad();
-	glViewport(mScreenViewport.left, mScreenViewport.top, mScreenViewport.width, mScreenViewport.height);
 
 	FGLDebug::PopGroup();
 }

src/gl/scene/gl_scene.cpp

@@ -491,6 +491,8 @@ void FGLRenderer::DrawScene(int drawmode)
 
 	RenderScene(recursion);
 
+	AmbientOccludeScene();
+
 	// Handle all portals after rendering the opaque objects but before
 	// doing all translucent stuff
 	recursion++;

src/gl/shaders/gl_ambientshader.cpp

@@ -65,6 +65,8 @@ void FLinearDepthShader::Bind(bool multisample)
 		LinearizeDepthB[multisample].Init(shader, "LinearizeDepthB");
 		InverseDepthRangeA[multisample].Init(shader, "InverseDepthRangeA");
 		InverseDepthRangeB[multisample].Init(shader, "InverseDepthRangeB");
+		Scale[multisample].Init(shader, "Scale");
+		Offset[multisample].Init(shader, "Offset");
 	}
 	shader.Bind();
 }

src/gl/shaders/gl_ambientshader.h

@@ -14,6 +14,8 @@ public:
 	FBufferedUniform1f LinearizeDepthB[2];
 	FBufferedUniform1f InverseDepthRangeA[2];
 	FBufferedUniform1f InverseDepthRangeB[2];
+	FBufferedUniform2f Scale[2];
+	FBufferedUniform2f Offset[2];
 
 private:
 	FShaderProgram mShader[2];