diff --git a/docs/rh-log.txt b/docs/rh-log.txt
index 682b479a9..35fb4a21a 100644
--- a/docs/rh-log.txt
+++ b/docs/rh-log.txt
@@ -1,4 +1,6 @@
 May 16, 2008
+- Fixed: 3D hardware texture filling did not copy pixels with 0 alpha,
+  preserving whatever was underneath in the texture box previously.
 - Fixed: s_sound.cpp had its own idea of whether or not sounds were paused
   and did not entirely keep it in sync with the sound system's. This meant
   that when starting a new game from the menu, all sounds were played as
diff --git a/src/textures/bitmap.cpp b/src/textures/bitmap.cpp
index 25bfdc4b2..1e00e7fe6 100644
--- a/src/textures/bitmap.cpp
+++ b/src/textures/bitmap.cpp
@@ -57,7 +57,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 	case BLEND_NONE:
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				TBlend::OpC(pout[TDest::RED], TSrc::R(pin), a, inf);
 				TBlend::OpC(pout[TDest::GREEN], TSrc::G(pin), a, inf);
@@ -73,7 +74,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		// Doom's inverted invulnerability map
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				gray = clamp<int>(255 - TSrc::Gray(pin),0,255);
 
@@ -91,7 +93,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		// Heretic's golden invulnerability map
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				gray = TSrc::Gray(pin);
 				r=clamp<int>(gray+(gray>>1),0,255);
@@ -111,7 +114,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		// Skulltag's red Doomsphere map
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				gray = TSrc::Gray(pin);
 				r=clamp<int>(gray+(gray>>1),0,255);
@@ -130,7 +134,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		// Skulltags's Guardsphere map
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				gray = TSrc::Gray(pin);
 				r=clamp<int>(gray+(gray>>1),0,255);
@@ -150,7 +155,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		// Since this is done in True Color the purplish tint is fully preserved - even in Doom!
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				int gray = TSrc::Gray(pin)>>4;
 	
@@ -171,7 +177,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 			fac=inf->blend-BLEND_DESATURATE1+1;
 			for(i=0;i<count;i++)
 			{
-				if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 				{
 					gray = TSrc::Gray(pin);
 					r = (TSrc::R(pin)*(31-fac) + gray*fac)/31;
@@ -192,7 +199,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 	case BLEND_MODULATE:
 		for(i=0;i<count;i++)
 		{
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				r = (TSrc::R(pin)*inf->blendcolor[0])>>FRACBITS;
 				g = (TSrc::G(pin)*inf->blendcolor[1])>>FRACBITS;
@@ -212,7 +220,8 @@ void iCopyColors(BYTE *pout, const BYTE *pin, int count, int step, FCopyInfo *in
 		for(i=0;i<count;i++)
 		{
 			// color blend
-			if ((a = TSrc::A(pin)))
+			a = TSrc::A(pin);
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				r = (TSrc::R(pin)*inf->blendcolor[3] + inf->blendcolor[0]) >> FRACBITS;
 				g = (TSrc::G(pin)*inf->blendcolor[3] + inf->blendcolor[1]) >> FRACBITS;
@@ -311,6 +320,17 @@ static const CopyFunc copyfuncs[][9]={
 		iCopyColors<cRGB555, cBGRA, bCopyAlpha>,
 		iCopyColors<cPalEntry, cBGRA, bCopyAlpha>
 	},
+	{
+		iCopyColors<cRGB, cBGRA, bOverwrite>,
+		iCopyColors<cRGBA, cBGRA, bOverwrite>,
+		iCopyColors<cIA, cBGRA, bOverwrite>,
+		iCopyColors<cCMYK, cBGRA, bOverwrite>,
+		iCopyColors<cBGR, cBGRA, bOverwrite>,
+		iCopyColors<cBGRA, cBGRA, bOverwrite>,
+		iCopyColors<cI16, cBGRA, bOverwrite>,
+		iCopyColors<cRGB555, cBGRA, bOverwrite>,
+		iCopyColors<cPalEntry, cBGRA, bOverwrite>
+	},
 };
 
 //===========================================================================
@@ -461,9 +481,9 @@ void iCopyPaletted(BYTE *buffer, const BYTE * patch, int srcwidth, int srcheight
 		for (x=0;x<srcwidth;x++,pos+=4)
 		{
 			int v=(unsigned char)patch[y*step_y+x*step_x];
-			int a;
+			int a = palette[v].a;
 
-			if ((a = palette[v].a))
+			if (TBlend::ProcessAlpha0() || a)
 			{
 				TBlend::OpC(buffer[pos + TDest::RED], palette[v].r, a, inf);
 				TBlend::OpC(buffer[pos + TDest::GREEN], palette[v].g, a, inf);
@@ -487,6 +507,7 @@ static const CopyPalettedFunc copypalettedfuncs[]=
 	iCopyPaletted<cBGRA, bReverseSubtract>,
 	iCopyPaletted<cBGRA, bModulate>,
 	iCopyPaletted<cBGRA, bCopyAlpha>,
+	iCopyPaletted<cBGRA, bOverwrite>
 };
 
 //===========================================================================
diff --git a/src/textures/bitmap.h b/src/textures/bitmap.h
index 75401547f..669218a5b 100644
--- a/src/textures/bitmap.h
+++ b/src/textures/bitmap.h
@@ -281,7 +281,8 @@ enum ECopyOp
 	OP_SUBTRACT,
 	OP_REVERSESUBTRACT,
 	OP_MODULATE,
-	OP_COPYALPHA
+	OP_COPYALPHA,
+	OP_OVERWRITE
 };
 
 struct FCopyInfo
@@ -297,42 +298,56 @@ struct bCopy
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = s; }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return false; }
+};
+
+struct bOverwrite
+{
+	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = s; }
+	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bBlend
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (d*i->invalpha + s*i->alpha) >> FRACBITS; }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bAdd
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MIN<int>((d*FRACUNIT + s*i->alpha) >> FRACBITS, 255); }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bSubtract
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MAX<int>((d*FRACUNIT - s*i->alpha) >> FRACBITS, 0); }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bReverseSubtract
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = MAX<int>((-d*FRACUNIT + s*i->alpha) >> FRACBITS, 0); }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bModulate
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (s*d)/255; }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 struct bCopyAlpha
 {
 	static __forceinline void OpC(BYTE &d, BYTE s, BYTE a, FCopyInfo *i) { d = (s*a + d*(255-a))/255; }
 	static __forceinline void OpA(BYTE &d, BYTE s, FCopyInfo *i) { d = s; }
+	static __forceinline bool ProcessAlpha0() { return true; }
 };
 
 
diff --git a/src/textures/texture.cpp b/src/textures/texture.cpp
index 6fde43848..3e03fa785 100644
--- a/src/textures/texture.cpp
+++ b/src/textures/texture.cpp
@@ -458,8 +458,9 @@ void FTexture::FillBuffer(BYTE *buff, int pitch, int height, FTextureFormat fmt)
 
 	case TEX_RGB:
 	{
+		FCopyInfo inf = {OP_OVERWRITE, };
 		FBitmap bmp(buff, pitch, pitch/4, height);
-		CopyTrueColorPixels(&bmp, 0, 0); 
+		CopyTrueColorPixels(&bmp, 0, 0, 0, &inf); 
 		break;
 	}