- Added a check to Dehacked code which tries to set the blend color.

It must set it to 0 if the alpha is 0 to avoid problems with special
  colormap detection.
- Changed SPECIALCOLORMAP_MASK again so that it does not interfere with
  any valid setting. It must use a value with a 0-alpha because these
  are guaranteed not to be produced by the DECORATE code elsewhere.
- Fixed precision issues with AddFixedColormap's search for identical colormaps.
- Added custom colormap support to texture composition code.
- Fixed initialization of FSpecialColormap::GrayscaleToColor. This is not
  a mapping from the palette but from a [0,255] grayscale ramp and used to
  apply colormaps to true color images for texture composition.

SVN r1867 (trunk)

docs/rh-log.txt

@@ -1,3 +1,16 @@
+September 22, 2009  (Changes by Graf Zahl)
+- Added a check to Dehacked code which tries to set the blend color.
+  It must set it to 0 if the alpha is 0 to avoid problems with special
+  colormap detection.
+- Changed SPECIALCOLORMAP_MASK again so that it does not interfere with
+  any valid setting. It must use a value with a 0-alpha because these
+  are guaranteed not to be produced by the DECORATE code elsewhere.
+- Fixed precision issues with AddFixedColormap's search for identical colormaps.
+- Added custom colormap support to texture composition code.
+- Fixed initialization of FSpecialColormap::GrayscaleToColor. This is not
+  a mapping from the palette but from a [0,255] grayscale ramp and used to
+  apply colormaps to true color images for texture composition.
+
 September 21, 2009
 - For hardware 2D, apply fixed colormaps when copying to video memory instead
   of doing it directly during the rendering, in order to improve visual

src/d_dehacked.cpp

@@ -1793,7 +1793,7 @@ static int PatchMisc (int dummy)
 					{
 						Printf ("Bad powerup color description \"%s\" for %s\n", Line2, Line1);
 					}
-					else
+					else if (a > 0)
 					{
 						static_cast<APowerup *>(GetDefaultByType (types[i]))->BlendColor = PalEntry(
 							BYTE(clamp(a,0.f,1.f)*255.f),
@@ -1801,6 +1801,10 @@ static int PatchMisc (int dummy)
 							clamp(g,0,255),
 							clamp(b,0,255));
 					}
+					else
+					{
+						static_cast<APowerup *>(GetDefaultByType (types[i]))->BlendColor = 0;
+					}
 				}
 			}
 			else

src/textures/multipatchtexture.cpp

@@ -423,19 +423,19 @@ const BYTE *FMultiPatchTexture::GetColumn (unsigned int column, const Span **spa
 BYTE *GetBlendMap(PalEntry blend, BYTE *blendwork)
 {
 
-	switch (blend.a==0 ? blend.r : -1)
+	switch (blend.a==0 ? int(blend) : -1)
 	{
 	case BLEND_ICEMAP:
 		return TranslationToTable(TRANSLATION(TRANSLATION_Standard, 7))->Remap;
 
 	default:
-		if (blend.r >= BLEND_SPECIALCOLORMAP1)
+		if (blend >= BLEND_SPECIALCOLORMAP1)
 		{
-			return SpecialColormaps[blend.r - BLEND_SPECIALCOLORMAP1].Colormap;
+			return SpecialColormaps[blend - BLEND_SPECIALCOLORMAP1].Colormap;
 		}
-		else if (blend.r >= BLEND_DESATURATE1 && blend.r <= BLEND_DESATURATE31)
+		else if (blend >= BLEND_DESATURATE1 && blend <= BLEND_DESATURATE31)
 		{
-			return DesaturateColormap[blend.r - BLEND_DESATURATE1];
+			return DesaturateColormap[blend - BLEND_DESATURATE1];
 		}
 		else 
 		{
@@ -1048,17 +1048,17 @@ void FMultiPatchTexture::ParsePatch(FScanner &sc, TexPart & part)
 				match = sc.MatchString(maps);
 				if (match >= 0)
 				{
-					part.Blend.r = BLEND_SPECIALCOLORMAP1 + match;
+					part.Blend = BLEND_SPECIALCOLORMAP1 + match;
 				}
 				else if (sc.Compare("ICE"))
 				{
-					part.Blend.r = BLEND_ICEMAP;
+					part.Blend = BLEND_ICEMAP;
 				}
 				else if (sc.Compare("DESATURATE"))
 				{
 					sc.MustGetStringName(",");
 					sc.MustGetNumber();
-					part.Blend.r = BLEND_DESATURATE1 + clamp(sc.Number-1, 0, 30);
+					part.Blend = BLEND_DESATURATE1 + clamp(sc.Number-1, 0, 30);
 				}
 				else
 				{
@@ -1074,6 +1074,36 @@ void FMultiPatchTexture::ParsePatch(FScanner &sc, TexPart & part)
 				}
 
 			}
+			else if (sc.Compare("Colormap"))
+			{
+				float r1,g1,b1;
+				float r2,g2,b2;
+
+				sc.MustGetFloat();
+				r1 = (float)sc.Float;
+				sc.MustGetStringName(",");
+				sc.MustGetFloat();
+				g1 = (float)sc.Float;
+				sc.MustGetStringName(",");
+				sc.MustGetFloat();
+				b1 = (float)sc.Float;
+				if (!sc.CheckString(","))
+				{
+					part.Blend = AddSpecialColormap(0,0,0, r1, g1, b1);
+				}
+				else
+				{
+					sc.MustGetFloat();
+					r2 = (float)sc.Float;
+					sc.MustGetStringName(",");
+					sc.MustGetFloat();
+					g2 = (float)sc.Float;
+					sc.MustGetStringName(",");
+					sc.MustGetFloat();
+					b2 = (float)sc.Float;
+					part.Blend = AddSpecialColormap(r1, g1, b1, r2, g2, b2);
+				}
+			}
 			else if (sc.Compare("Blend"))
 			{
 				bComplex = true;
@@ -1100,10 +1130,14 @@ void FMultiPatchTexture::ParsePatch(FScanner &sc, TexPart & part)
 					sc.MustGetStringName(",");
 					part.Blend = MAKERGB(r, g, b);
 				}
+				// Blend.a may never be 0 here.
 				if (sc.CheckString(","))
 				{
 					sc.MustGetFloat();
-					part.Blend.a = clamp<int>(int(sc.Float*255), 1, 254);
+					if (sc.Float > 0.f)
+						part.Blend.a = clamp<int>(int(sc.Float*255), 1, 254);
+					else
+						part.Blend = 0;
 				}
 				else part.Blend.a = 255;
 			}

src/thingdef/thingdef_properties.cpp

@@ -1601,7 +1601,7 @@ DEFINE_CLASS_PROPERTY_PREFIX(powerup, color, C_f, Inventory)
 	else alpha = 255/3;
 
 	alpha=clamp<int>(alpha, 0, 255);
-	if (alpha!=0) *pBlendColor = MAKEARGB(alpha, 0, 0, 0) | color;
+	if (alpha != 0) *pBlendColor = MAKEARGB(alpha, 0, 0, 0) | color;
 	else *pBlendColor = 0;
 }
 

src/v_palette.cpp

@@ -35,6 +35,7 @@
 #include <stddef.h>
 #include <string.h>
 #include <math.h>
+#include <float.h>
 #ifdef _WIN32
 #include <io.h>
 #else
@@ -360,24 +361,25 @@ static bool FixBuildPalette (BYTE *opal, int lump, bool blood)
 	return true;
 }
 
-int AddSpecialColormap(double r1, double g1, double b1, double r2, double g2, double b2)
+int AddSpecialColormap(float r1, float g1, float b1, float r2, float g2, float b2)
 {
 	// Clamp these in range for the hardware shader.
-	r1 = clamp(r1, 0.0, 2.0);
+	r1 = clamp(r1, 0.0f, 2.0f);
-	g1 = clamp(g1, 0.0, 2.0);
+	g1 = clamp(g1, 0.0f, 2.0f);
-	b1 = clamp(b1, 0.0, 2.0);
+	b1 = clamp(b1, 0.0f, 2.0f);
-	r2 = clamp(r2, 0.0, 2.0);
+	r2 = clamp(r2, 0.0f, 2.0f);
-	g2 = clamp(g2, 0.0, 2.0);
+	g2 = clamp(g2, 0.0f, 2.0f);
-	b2 = clamp(b2, 0.0, 2.0);
+	b2 = clamp(b2, 0.0f, 2.0f);
 
 	for(unsigned i=0; i<SpecialColormaps.Size(); i++)
 	{
-		if (SpecialColormaps[i].ColorizeStart[0] == r1 &&
+		// Avoid precision issues here when trying to find a proper match.
-			SpecialColormaps[i].ColorizeStart[1] == g1 &&
+		if (fabs(SpecialColormaps[i].ColorizeStart[0]- r1) < FLT_EPSILON &&
-			SpecialColormaps[i].ColorizeStart[2] == b1 &&
+			fabs(SpecialColormaps[i].ColorizeStart[1]- g1) < FLT_EPSILON &&
-			SpecialColormaps[i].ColorizeEnd[0] == r2 &&
+			fabs(SpecialColormaps[i].ColorizeStart[2]- b1) < FLT_EPSILON &&
-			SpecialColormaps[i].ColorizeEnd[1] == g2 &&
+			fabs(SpecialColormaps[i].ColorizeEnd[0]- r2) < FLT_EPSILON &&
-			SpecialColormaps[i].ColorizeEnd[2] == b2)
+			fabs(SpecialColormaps[i].ColorizeEnd[1]- g2) < FLT_EPSILON &&
+			fabs(SpecialColormaps[i].ColorizeEnd[2]- b2) < FLT_EPSILON)
 		{
 			return i;	// The map already exists
 		}
@@ -412,7 +414,12 @@ int AddSpecialColormap(double r1, double g1, double b1, double r2, double g2, do
 		cm->Colormap[c] = ColorMatcher.Pick(pe);
 
 		// This table is used by the texture composition code
-		cm->GrayscaleToColor[c] = pe;
+		for(int i = 0;i < 256; i++)
+		{
+			cm->GrayscaleToColor[i] = PalEntry(	MIN(255, int(r1 + i*r2)), 
+												MIN(255, int(g1 + i*g2)), 
+												MIN(255, int(b1 + i*b2)));
+		}
 	}
 	return SpecialColormaps.Size() - 1;
 }

src/v_palette.h

@@ -106,7 +106,7 @@ struct FSpecialColormap
 extern TArray<FSpecialColormap> SpecialColormaps;
 
 // some utility functions to store special colormaps in powerup blends
-#define SPECIALCOLORMAP_MASK 0xBEEF0000
+#define SPECIALCOLORMAP_MASK 0x00b60000
 
 inline int MakeSpecialColormap(int index)
 {
@@ -124,7 +124,7 @@ inline int GetSpecialColormap(int blend)
 	return IsSpecialColormap(blend) ? blend & 0xFFFF : NOFIXEDCOLORMAP;
 }
 
-int AddSpecialColormap(double r1, double g1, double b1, double r2, double g2, double b2);
+int AddSpecialColormap(float r1, float g1, float b1, float r2, float g2, float b2);