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Shaders/common/pass_viewray.vert.glsl

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+#version 450
+
+uniform mat4 invVP;
+uniform vec3 eye;
+
+in vec2 pos;
+
+out vec2 texCoord;
+out vec3 viewRay;
+
+void main() {
+	// Scale vertex attribute to [0-1] range
+	const vec2 madd = vec2(0.5, 0.5);
+	texCoord = pos.xy * madd + madd;
+	#ifdef HLSL
+	texCoord.y = 1.0 - texCoord.y;
+	#endif
+
+	gl_Position = vec4(pos.xy, 0.0, 1.0);
+
+	// fullscreen triangle: http://de.slideshare.net/DevCentralAMD/vertex-shader-tricks-bill-bilodeau
+	// gl_Position = vec4((gl_VertexID % 2) * 4.0 - 1.0, (gl_VertexID / 2) * 4.0 - 1.0,  0.0, 1.0);
+
+	// NDC (at the back of cube)
+	vec4 v = vec4(pos.x, pos.y, 1.0, 1.0);
+	v = vec4(invVP * v);
+	v.xyz /= v.w;
+	viewRay = v.xyz - eye;
+}