- refactoring of fixed colormap stuff to have it better organized and to reduce the number of uniforms in the main shader.

This removes 3 uniforms, consisting of 9 floats. Those were merged into other values that never get used at the same time.
It also moves the costly setup of the fixed colormap out of the render state into the 2D processing code.
Since 3D forces use of render buffers now, it is no longer necessary to draw the entire scene with the colormap active, meaning it can be handled more efficiently.

src/r_data/colormaps.h

@@ -128,18 +128,11 @@ extern uint8_t DesaturateColormap[31][256];
 
 enum EColorManipulation
 {
-	CM_SPECIAL2D = -3,			// the special colormaps get passed as color pair from the 2D drawer so they need a different value here.
 	CM_PLAIN2D = -2,			// regular 2D drawing.
 	CM_INVALID = -1,
 	CM_DEFAULT = 0,					// untranslated
 	CM_FIRSTSPECIALCOLORMAP,		// first special fixed colormap
 	CM_FIRSTSPECIALCOLORMAPFORCED = 0x08000000,	// first special fixed colormap, application forced (for 2D overlays)
-
-	CM_FOGLAYER = 0x10000000,	// Sprite shaped fog layer
-
-	// These are not to be passed to the texture manager
-	CM_LITE = 0x20000000,		// special values to handle these items without excessive hacking
-	CM_TORCH = 0x20000010,		// These are not real color manipulations
 };
 
 #define CM_MAXCOLORMAP int(CM_FIRSTSPECIALCOLORMAP + SpecialColormaps.Size())