Add support for non-square matrix uniforms in desktop GLSL. The notation is columns x rows, e.g. a mat4x2 has 4 columns and 2 rows.

Fixed the memory layout of matrices sent to shaders via Shader:send. Note that this is a breaking fix and will probably cause matrices designed to work with older versions of LÖVE to be transposed in shaders compared to what they were previously, if Shader:send or sendMatrix was used to put them in the shader.

--HG--
branch : minor

src/modules/graphics/opengl/Shader.h

@@ -88,11 +88,21 @@ public:
 		std::string pixel;
 	};
 
+	struct MatrixSize
+	{
+		short columns;
+		short rows;
+	};
+
 	struct UniformInfo
 	{
 		int location;
 		int count;
-		int components;
+		union
+		{
+			int components;
+			MatrixSize matrix;
+		};
 		UniformType baseType;
 		std::string name;
 	};
@@ -195,7 +205,8 @@ private:
 	// Map active uniform names to their locations.
 	void mapActiveUniforms();
 
-	int getUniformTypeSize(GLenum type) const;
+	int getUniformTypeComponents(GLenum type) const;
+	MatrixSize getMatrixSize(GLenum type) const;
 	UniformType getUniformBaseType(GLenum type) const;
 
 	GLuint compileCode(ShaderStage stage, const std::string &code);