PostProcessing: Add support for user-supplied anaglyph shaders.

There are lots of different anaglyph glasses out there and there may be even more creative uses for stereoscopic post-processing shaders.

Data/Sys/Shaders/Anaglyph/dubois.glsl

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+// Anaglyph Red-Cyan shader based on Dubois algorithm
+// Constants taken from the paper:
+// "Conversion of a Stereo Pair to Anaglyph with
+// the Least-Squares Projection Method"
+// Eric Dubois, March 2009
+
+void main()
+{
+	float4 c0 = SampleLayer(0);
+	float4 c1 = SampleLayer(1);
+	mat3 l = mat3( 0.437, 0.449, 0.164,
+	              -0.062,-0.062,-0.024,
+	              -0.048,-0.050,-0.017);
+	mat3 r = mat3(-0.011,-0.032,-0.007,
+	               0.377, 0.761, 0.009,
+	              -0.026,-0.093, 1.234);
+	SetOutput(float4(c0.rgb * l + c1.rgb * r, c0.a));
+}

Data/Sys/Shaders/Anaglyph/fullcolor.glsl

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+// Anaglyph Red-Cyan shader without compensation
+
+void main()
+{
+	float4 c0 = SampleLayer(0);
+	float4 c1 = SampleLayer(1);
+	SetOutput(float4(c0.r, c1.gb, c0.a));
+}

Data/Sys/Shaders/Anaglyph/grayscale.glsl

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+// Anaglyph Red-Cyan grayscale shader
+
+void main()
+{
+	float4 c0 = SampleLayer(0);
+	float avg0 = (c0.r + c0.g + c0.b) / 3.0;
+	float4 c1 = SampleLayer(1);
+	float avg1 = (c1.r + c1.g + c1.b) / 3.0;
+	SetOutput(float4(avg0, avg1, avg1, c0.a));
+}

Data/Sys/Shaders/Anaglyph/grayscale2.glsl

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+// Anaglyph Red-Cyan luma grayscale shader
+// Info: http://www.oreillynet.com/cs/user/view/cs_msg/8691
+
+void main()
+{
+	float3 luma = float3(0.222, 0.707, 0.071);
+	float4 c0 = SampleLayer(0);
+	float avg0 = dot(c0.rgb, luma);
+	float4 c1 = SampleLayer(1);
+	float avg1 = dot(c1.rgb, luma);
+	SetOutput(float4(avg0, avg1, avg1, c0.a));
+}