Use correct height for y correction in set/getScissor (bug #234)

src/modules/graphics/opengl/Framebuffer.cpp

@@ -372,6 +372,16 @@ namespace opengl
 		strategy->deleteFBO(fbo, depthbuffer, img);
 	}
 
+	int Framebuffer::getWidth()
+	{
+		return width;
+	}
+
+	int Framebuffer::getHeight()
+	{
+		return height;
+	}
+
 } // opengl
 } // graphics
 } // love

src/modules/graphics/opengl/Framebuffer.h

@@ -41,6 +41,9 @@ namespace opengl
 		void setWrap(const Image::Wrap &w);
 		Image::Wrap getWrap() const;
 
+		int getWidth();
+		int getHeight();
+
 		bool loadVolatile();
 		void unloadVolatile();
 

src/modules/graphics/opengl/Graphics.cpp

@@ -365,6 +365,13 @@ namespace opengl
 		return currentMode.height;
 	}
 
+	int Graphics::getRenderHeight()
+	{
+		if (Framebuffer::current)
+			return Framebuffer::current->getHeight();
+		return currentMode.height;
+	}
+
 	bool Graphics::isCreated()
 	{
 		return (currentMode.width > 0) || (currentMode.height > 0);
@@ -409,7 +416,7 @@ namespace opengl
 	void Graphics::setScissor(int x, int y, int width, int height)
 	{
 		glEnable(GL_SCISSOR_TEST);
-		glScissor(x, getHeight() - (y + height), width, height); // Compensates for the fact that our y-coordinate is reverse of OpenGLs.
+		glScissor(x, getRenderHeight() - (y + height), width, height); // Compensates for the fact that our y-coordinate is reverse of OpenGLs.
 	}
 
 	void Graphics::setScissor()
@@ -426,7 +433,7 @@ namespace opengl
 		glGetIntegerv(GL_SCISSOR_BOX, scissor);
 
 		lua_pushnumber(L, scissor[0]);
-		lua_pushnumber(L, getHeight() - (scissor[1] + scissor[3])); // Compensates for the fact that our y-coordinate is reverse of OpenGLs.
+		lua_pushnumber(L, getRenderHeight() - (scissor[1] + scissor[3])); // Compensates for the fact that our y-coordinate is reverse of OpenGLs.
 		lua_pushnumber(L, scissor[2]);
 		lua_pushnumber(L, scissor[3]);
 

src/modules/graphics/opengl/Graphics.h

@@ -118,6 +118,8 @@ namespace opengl
 		GLint matrixLimit;
 		GLint userMatrices;
 
+		int getRenderHeight();
+
 	public:
 
 		Graphics();