- added a 'check only' option to CreateTexBuffer.

This is meant to calculate the content ID without constructing the texture buffer.

src/textures/hires/hirestex.cpp

@@ -358,7 +358,7 @@ int FTexture::CheckExternalFile(bool & hascolorkey)
 //
 //==========================================================================
 
-bool FTexture::LoadHiresTexture(FTextureBuffer &texbuffer)
+bool FTexture::LoadHiresTexture(FTextureBuffer &texbuffer, bool checkonly)
 {
 	if (HiresLump == -1)
 	{
@@ -377,6 +377,8 @@ bool FTexture::LoadHiresTexture(FTextureBuffer &texbuffer)
 		int w = HiresTexture->GetWidth();
 		int h = HiresTexture->GetHeight();
 
+		if (!checkonly)
+		{
 			unsigned char * buffer = new unsigned char[w*(h + 1) * 4];
 			memset(buffer, 0, w * (h + 1) * 4);
 
@@ -397,6 +399,7 @@ bool FTexture::LoadHiresTexture(FTextureBuffer &texbuffer)
 					if (dwdata[i] == 0xffffff00 || dwdata[i] == 0xffff00ff) dwdata[i] = 0;
 				}
 			}
+		}
 		FContentIdBuilder contentId;
 		contentId.id = 0;
 		contentId.imageID = HiresTexture->GetImage()->GetId();

src/textures/hires/hqresize.cpp

@@ -352,7 +352,7 @@ static void xbrzOldScale(size_t factor, const uint32_t* src, uint32_t* trg, int
 //  the upsampled buffer.
 //
 //===========================================================================
-void FTexture::CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasAlpha)
+void FTexture::CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasAlpha, bool checkonly)
 {
 	// [BB] Make sure that inWidth and inHeight denote the size of
 	// the returned buffer even if we don't upsample the input buffer.
@@ -398,10 +398,12 @@ void FTexture::CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasA
 			type = 2;
 		}
 #endif
-		if (mult < 2)
+		// These checks are to ensure consistency of the content ID.
-			type = 0;
+		if (mult < 2 || mult > 6 || type < 1 || type > 6) return;
-
+		if (type < 4 && mult > 4) mult = 4;
 
+		if (!checkonly)
+		{
 			if (type == 1)
 			{
 				if (mult == 2)
@@ -442,7 +444,7 @@ void FTexture::CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasA
 				texbuffer.mBuffer = normalNxHelper(&normalNx, mult, texbuffer.mBuffer, inWidth, inHeight, texbuffer.mWidth, texbuffer.mHeight);
 			else
 				return;
-
+		}
 		// Encode the scaling method in the content ID.
 		FContentIdBuilder contentId;
 		contentId.id = texbuffer.mContentId;

src/textures/texture.cpp

@@ -668,6 +668,7 @@ FTextureBuffer FTexture::CreateTexBuffer(int translation, int flags)
 	unsigned char * buffer = nullptr;
 	int W, H;
 	int isTransparent = -1;
+	bool checkonly = !!(flags & CTF_CheckOnly);
 
 	if (flags & CTF_CheckHires)
 	{
@@ -679,6 +680,8 @@ FTextureBuffer FTexture::CreateTexBuffer(int translation, int flags)
 	W = GetWidth() + 2 * exx;
 	H = GetHeight() + 2 * exx;
 
+	if (!checkonly)
+	{
 		buffer = new unsigned char[W*(H + 1) * 4];
 		memset(buffer, 0, W * (H + 1) * 4);
 
@@ -699,6 +702,7 @@ FTextureBuffer FTexture::CreateTexBuffer(int translation, int flags)
 			isTransparent = 0;
 			// A translated image is not conclusive for setting the texture's transparency info.
 		}
+	}
 
 	if (GetImage())
 	{
@@ -718,8 +722,8 @@ FTextureBuffer FTexture::CreateTexBuffer(int translation, int flags)
 	// Only do postprocessing for image-backed textures. (i.e. not for the burn texture which can also pass through here.)
 	if (GetImage() && flags & CTF_ProcessData) 
 	{
-		CreateUpsampledTextureBuffer(result, !!isTransparent);
+		CreateUpsampledTextureBuffer(result, !!isTransparent, checkonly);
-		ProcessData(result.mBuffer, result.mWidth, result.mHeight, false);
+		if (!checkonly) ProcessData(result.mBuffer, result.mWidth, result.mHeight, false);
 	}
 
 	return result;

src/textures/textures.h

@@ -109,6 +109,7 @@ enum ECreateTexBufferFlags
 	CTF_CheckHires = 1,		// use external hires replacement if found
 	CTF_Expand = 2,			// create buffer with a one-pixel wide border
 	CTF_ProcessData = 4,	// run postprocessing on the generated buffer. This is only needed when using the data for a hardware texture.
+	CTF_CheckOnly = 8,		// Only runs the code to get a content ID but does not create a texture. Can be used to access a caching system for the hardware textures.
 };
 
 
@@ -282,7 +283,7 @@ public:
 	virtual ~FTexture ();
 	virtual FImageSource *GetImage() const { return nullptr; }
 	void AddAutoMaterials();
-	void CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasAlpha);
+	void CreateUpsampledTextureBuffer(FTextureBuffer &texbuffer, bool hasAlpha, bool checkonly);
 
 	// These are mainly meant for 2D code which only needs logical information about the texture to position it properly.
 	int GetDisplayWidth() { return GetScaledWidth(); }
@@ -491,7 +492,7 @@ public:
 private:
 	int CheckDDPK3();
 	int CheckExternalFile(bool & hascolorkey);
-	bool LoadHiresTexture(FTextureBuffer &texbuffer);
+	bool LoadHiresTexture(FTextureBuffer &texbuffer, bool checkonly);
 
 	bool bSWSkyColorDone = false;
 	PalEntry FloorSkyColor;