- extended FTexture::GetPixels and FTexture::GetColumn by a RenderStyle parameter.

Now it is no longer necessary to provide specially set up textures for rendering shaded decals, they can use any PNG texture now that contains a proper red channel.
Handling of the alPh chunk has been removed as a result as it in no longer needed.

src/polyrenderer/poly_renderthread.h

@@ -47,7 +47,7 @@ public:
 	DrawerCommandQueuePtr DrawQueue;
 
 	// Make sure texture can accessed safely
-	void PrepareTexture(FTexture *texture);
+	void PrepareTexture(FTexture *texture, FRenderStyle style);
 
 	// Setup poly object in a threadsafe manner
 	void PreparePolyObject(subsector_t *sub);