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Updated OpenGL renderers

--- a/src/Backends/Rendering/OpenGL3.cpp

+++ b/src/Backends/Rendering/OpenGL3.cpp

@@ -696,29 +696,14 @@

 	(void)surface;

 }

-unsigned char* RenderBackend_LockSurface(RenderBackend_Surface *surface, size_t *pitch, size_t width, size_t height)

+void RenderBackend_UploadSurface(RenderBackend_Surface *surface, const unsigned char *pixels, size_t width, size_t height)

 {

-	if (surface == NULL)

-		return NULL;

-

-	surface->pixels = (unsigned char*)malloc(width * height * 3);

-	*pitch = width * 3;

-	return surface->pixels;

-}

-

-void RenderBackend_UnlockSurface(RenderBackend_Surface *surface, size_t width, size_t height)

-{

-	if (surface == NULL)

-		return;

-

 	// Flush the vertex buffer if we're about to modify its texture

 	if (surface->texture_id == last_source_texture || surface->texture_id == last_destination_texture)

 		FlushVertexBuffer();

 	glBindTexture(GL_TEXTURE_2D, surface->texture_id);

-	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, surface->pixels);

-	free(surface->pixels);

-

+	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels);

 	glBindTexture(GL_TEXTURE_2D, last_source_texture);

 }