- moved CreateTexBuffer out of the GL code.

This is merely a buffer creation function with no dependencies on the renderer.

src/textures/texture.cpp

@@ -59,6 +59,7 @@ CUSTOM_CVAR(Int, r_spriteadjust, 2, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 	TexMan.SpriteAdjustChanged();
 }
 
+EXTERN_CVAR(Bool, gl_texture_usehires)
 
 //==========================================================================
 //
@@ -1341,6 +1342,116 @@ bool FTexture::ProcessData(unsigned char * buffer, int w, int h, bool ispatch)
 	return true;
 }
 
+//===========================================================================
+// 
+//	Initializes the buffer for the texture data
+//
+//===========================================================================
+
+unsigned char * FTexture::CreateTexBuffer(int translation, int & w, int & h, int flags)
+{
+	unsigned char * buffer;
+	int W, H;
+	int isTransparent = -1;
+
+
+	// Textures that are already scaled in the texture lump will not get replaced
+	// by hires textures
+	if (gl_texture_usehires && (flags & CTF_CheckHires) && translation != STRange_AlphaTexture)
+	{
+		buffer = LoadHiresTexture(&w, &h);
+		if (buffer)
+		{
+			return buffer;
+		}
+	}
+
+	int exx = !!(flags & CTF_Expand);
+
+	W = w = GetWidth() + 2 * exx;
+	H = h = GetHeight() + 2 * exx;
+
+
+	buffer = new unsigned char[W*(H + 1) * 4];
+	memset(buffer, 0, W * (H + 1) * 4);
+
+	FBitmap bmp(buffer, W * 4, W, H);
+
+	if (translation <= 0 || translation >= STRange_Min)
+	{
+		// Allow creation of desaturated or special-colormapped textures for the legacy renderer.
+		FCopyInfo inf = { OP_COPY, BLEND_NONE,{ 0 }, 0, 0 };
+		if (translation >= STRange_Desaturate && translation < STRange_Desaturate + 31)	// there are 31 ranges of desaturations available
+		{
+			inf.blend = (EBlend)(BLEND_DESATURATE1 + translation - STRange_Desaturate);
+		}
+		else if (translation >= STRange_Specialcolormap && translation < STRange_Specialcolormap + SpecialColormaps.Size())
+		{
+			inf.blend = (EBlend)(BLEND_SPECIALCOLORMAP1 + translation - STRange_Specialcolormap);
+		}
+
+		int trans = CopyTrueColorPixels(&bmp, exx, exx, 0, translation >= STRange_Min ? &inf : nullptr);
+		CheckTrans(buffer, W*H, trans);
+		isTransparent = bTranslucent;
+		// alpha texture for legacy mode
+		if (translation == STRange_AlphaTexture)
+		{
+			for (int i = 0; i < W*H; i++)
+			{
+				int b = buffer[4 * i];
+				int g = buffer[4 * i + 1];
+				int r = buffer[4 * i + 2];
+				int gray = Luminance(r, g, b);
+				buffer[4 * i] = 255;
+				buffer[4 * i + 1] = 255;
+				buffer[4 * i + 2] = 255;
+				buffer[4 * i + 3] = (buffer[4 * i + 3] * gray) >> 8;
+			}
+		}
+	}
+	else
+	{
+		// When using translations everything must be mapped to the base palette.
+		// so use CopyTrueColorTranslated
+		CopyTrueColorTranslated(&bmp, exx, exx, 0, FUniquePalette::GetPalette(translation));
+		isTransparent = 0;
+		// This is not conclusive for setting the texture's transparency info.
+	}
+
+	// [BB] The hqnx upsampling (not the scaleN one) destroys partial transparency, don't upsamle textures using it.
+	// [BB] Potentially upsample the buffer.
+	if (flags & CTF_ProcessData)
+	{
+		buffer = CreateUpsampledTextureBuffer(buffer, W, H, w, h, !!isTransparent);
+		ProcessData(buffer, w, h, false);
+	}
+	return buffer;
+}
+
+//===========================================================================
+// 
+// Dummy texture for the 0-entry.
+//
+//===========================================================================
+
+bool FTexture::GetTranslucency()
+{
+	if (bTranslucent == -1)
+	{
+		if (!bHasCanvas)
+		{
+			int w, h;
+			unsigned char *buffer = CreateTexBuffer(0, w, h);
+			delete[] buffer;
+		}
+		else
+		{
+			bTranslucent = 0;
+		}
+	}
+	return !!bTranslucent;
+}
+
 //===========================================================================
 // 
 // Dummy texture for the 0-entry.