don't update vbo, if there are no changes in Renderer::Swap

Signed-off-by: Ryan Houdek <Sonicadvance1@gmail.com>

Source/Core/Common/Src/MathUtil.h

@@ -118,6 +118,8 @@ struct Rectangle
 		: left(theLeft), top(theTop), right(theRight), bottom(theBottom)
 	{ }
 	
+	bool operator==(const Rectangle& r) { return left==r.left && top==r.top && right==r.right && bottom==r.bottom; }
+
 	T GetWidth() const { return abs(right - left); }
 	T GetHeight() const { return abs(bottom - top); }
 

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -109,6 +109,7 @@ namespace OGL
 static int s_fps = 0;
 static GLuint s_ShowEFBCopyRegions_VBO = 0;
 static GLuint s_Swap_VBO = 0;
+static TargetRectangle s_old_targetRc;
 
 static RasterFont* s_pfont = NULL;
 
@@ -255,6 +256,13 @@ Renderer::Renderer()
 	s_Swap_VBO = 0;
 	s_blendMode = 0;
 	
+	// should be invalid, so there will be an upload on the first call
+	s_old_targetRc.bottom = -1;
+	s_old_targetRc.top = -1;
+	s_old_targetRc.left = -1;
+	s_old_targetRc.right = -1;
+	
+
 	InitFPSCounter();
 
 #if defined HAVE_CG && HAVE_CG
@@ -1221,6 +1229,7 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); // switch to the window backbuffer
 		glBindTexture(GL_TEXTURE_RECTANGLE_ARB, read_texture);
 
+		if(!(s_old_targetRc == targetRc)) {
 			GLfloat vertices[] = {
 				-1.0f, -1.0f, 1.0f,
 				(GLfloat)targetRc.left, (GLfloat)targetRc.bottom,
@@ -1242,6 +1251,12 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 			glBindBuffer(GL_ARRAY_BUFFER, s_Swap_VBO);
 			glBufferData(GL_ARRAY_BUFFER, 4*7*sizeof(GLfloat), vertices, GL_STREAM_DRAW);
 			
+			s_old_targetRc = targetRc;
+		} else {
+			// TODO: remove this after switch to VAO
+			glBindBuffer(GL_ARRAY_BUFFER, s_Swap_VBO);
+		}
+
 		// disable all pointer, TODO: use VAO
 		glEnableClientState(GL_VERTEX_ARRAY);
 		glDisableVertexAttribArray(SHADER_POSMTX_ATTRIB);