Add detection/support for reverse-z projection matrices. Refs #169

renderdoc/maths/matrix.cpp

@@ -391,3 +391,17 @@ Matrix4f Matrix4f::Perspective(const float degfov, const float N, const float F,
 	
 	return Matrix4f(persp);
 }
+
+Matrix4f Matrix4f::ReversePerspective(const float degfov, const float N, const float A)
+{
+	const float radfov = degfov * (3.1415926535f/180.0f);
+	float S = 1/tanf(radfov * 0.5f);
+	
+	float persp[16] = { S/A, 0.0f, 0.0f, 0.0f,
+						0.0f, S, 0.0f, 0.0f,
+						0.0f, 0.0f, 0.0f, 1.0f,
+						0.0f, 0.0f, N, 0.0f,
+						};
+	
+	return Matrix4f(persp);
+}

renderdoc/maths/matrix.h

@@ -60,6 +60,7 @@ class Matrix4f
 		static Matrix4f RotationZYX(const Vec3f &rot);
 		static Matrix4f Orthographic(const float nearplane, const float farplane);
 		static Matrix4f Perspective(const float degfov, const float nearplane, const float farplane, const float aspect);
+		static Matrix4f ReversePerspective(const float degfov, const float nearplane, const float aspect);
 
 		inline float operator[](const size_t i) const
 		{