- fixed most issues with palette emulation.

Brightness is now correct - I have no idea why this factor of 1/0.85 is needed - something must reduce the brightness of the entire scene but I have no idea what.

source/glbackend/gl_palmanager.cpp

@@ -119,8 +119,16 @@ IHardwareTexture* PaletteManager::GetLookup(int index)
 		{
 			auto p = screen->CreateHardwareTexture(1);
 
+			// Perform a 0<->255 index swap. The lookup tables are still the original data.
 			TArray<uint8_t> lookup(numshades * 256, true);
 			memcpy(lookup.Data(), lookups.getTable(index), lookup.Size());
+			for (int i = 0; i < numshades; i++)
+			{
+				auto p = &lookup[i * 256];
+				p[255] = p[0];
+				p[0] = 0;
+				for (int v = 1; v <= 255; v++) if (p[v] == 0) p[v] = 255;
+			}
 			p->CreateTexture(lookup.Data(), 256, numshades, 15, false, "PaletteLookup");
 			lookuptextures[index] = p;
 		}

wadsrc/static/shaders/glsl/func_paletted.fp

@@ -17,15 +17,7 @@ vec4 ProcessTexel()
 	vec2 newCoord;
 	
 	// z is the depth in view space, positive going into the screen
-	float z;
-	if (((uPalLightLevels >> 8)  & 0xff) == 2)
-	{
-		z = distance(pixelpos.xyz, uCameraPos.xyz)*0.7;
-	}
-	else 
-	{
-		z = pixelpos.w;
-	} 	
+	float z = abs(pixelpos.w);
 	
 	// Coordinate adjustment for NPOT textures. It is somehow fitting that Build games exploited this texture wrapping quirk of the software rendering engine...
 	if (uNpotEmulation.y != 0.0)
@@ -68,5 +60,5 @@ vec4 ProcessTexel()
 		color.rgb = uFogColor.rgb * (1.0-fogfactor) + color.rgb * fogfactor;// mix(vec3(0.6), color.rgb, fogfactor);
 	}
 	if (color.a < uAlphaThreshold) discard;	// it's only here that we have the alpha value available to be able to perform the alpha test.
-	return color;
+	return vec4(color.rgb / 0.85, vColor.a);
 }

wadsrc/static/shaders/glsl/main.fp

@@ -161,7 +161,6 @@ const int Tex_Blend_Hardlight = 4;
 vec4 getTexel(vec2 st)
 {
 	vec4 texel = texture(tex, st);
-	
 	//
 	// Apply texture modes
 	//