- added a few more texture coloring options to the shader.

Aside from adding an additive component it can now also do:

- desaturation (not limited to the range of 0..1 so it can also be used for oversaturation by applying a negative number or negative saturation by going above 1.0.
- invert the texture
- apply a blend, including 3 special mode taken from EDuke32.

Currently only the implementation is done, it is not exposed to UDMF yet.

src/rendering/vulkan/shaders/vk_shader.cpp

@@ -118,11 +118,16 @@ static const char *shaderBindings = R"(
 		vec4 uObjectColor2;
 		vec4 uDynLightColor;
 		vec4 uAddColor;
+		vec4 uBlendColor;
 		vec4 uFogColor;
 		float uDesaturationFactor;
 		float uInterpolationFactor;
 		float timer; // timer data for material shaders
 		int useVertexData;
+		float uObjectDesaturationFactor;
+		float uObjectColorizeFactor;
+		int uObjectBlendMode;
+		int uObjectInvertColor;
 		vec4 uVertexColor;
 		vec4 uVertexNormal;