- preparations for passing palette lookup textures through the low level texture code.

source/common/textures/gametexture.h

@@ -91,7 +91,7 @@ class FGameTexture
 	SpritePositioningInfo* spi = nullptr;
 
 	ISoftwareTexture* SoftwareTexture = nullptr;
-	FMaterial* Material[4] = {  };
+	FMaterial* Material[5] = {  };
 
 	// Material properties
 	FVector2 detailScale = { 1.f, 1.f };

source/common/textures/hw_material.cpp

@@ -29,6 +29,13 @@
 #include "c_cvars.h"
 #include "v_video.h"
 
+static IHardwareTexture* (*layercallback)(int layer, int translation);
+
+void FMaterial::SetLayerCallback(IHardwareTexture* (*cb)(int layer, int translation))
+{
+	layercallback = cb;
+}
+
 //===========================================================================
 //
 // Constructor
@@ -42,8 +49,9 @@ FMaterial::FMaterial(FGameTexture * tx, int scaleflags)
 	auto imgtex = tx->GetTexture();
 	mTextureLayers.Push({ imgtex, scaleflags, -1 });
 
-	if (tx->GetUseType() == ETextureType::SWCanvas && static_cast<FWrapperTexture*>(imgtex)->GetColorFormat() == 0)
+	if ((tx->GetUseType() == ETextureType::SWCanvas && static_cast<FWrapperTexture*>(imgtex)->GetColorFormat() == 0) || (scaleflags & CTF_Indexed))
 	{
+		mTextureLayers[0].scaleFlags |= CTF_Indexed;
 		mShaderIndex = SHADER_Paletted;
 	}
 	else if (tx->isHardwareCanvas())
@@ -150,11 +158,24 @@ FMaterial::~FMaterial()
 //===========================================================================
 
 IHardwareTexture* FMaterial::GetLayer(int i, int translation, MaterialLayerInfo** pLayer) const
+{
+	if (mShaderIndex == SHADER_Paletted && i > 0 && layercallback)
+	{
+		static MaterialLayerInfo deflayer = { nullptr, 0, CLAMP_XY };
+		if (i == 1 || i == 2)
+		{
+			if (pLayer) *pLayer = &deflayer;
+			//This must be done with a user supplied callback because we cannot set up the rules for palette data selection here
+			return layercallback(i, translation);
+		}
+	}
+	else
 	{
 		auto& layer = mTextureLayers[i];
 		if (pLayer) *pLayer = &layer;
-	
+		if (mShaderIndex == SHADER_Paletted) translation = -1;
 		if (layer.layerTexture) return layer.layerTexture->GetHardwareTexture(translation, layer.scaleFlags);
+	}
 	return nullptr;
 }
 
@@ -169,6 +190,7 @@ FMaterial * FMaterial::ValidateTexture(FGameTexture * gtex, int scaleflags, bool
 {
 	if (gtex && gtex->isValid())
 	{
+		if (scaleflags & CTF_Indexed) scaleflags = CTF_Indexed;
 		if (!gtex->expandSprites()) scaleflags &= ~CTF_Expand;
 
 		FMaterial *hwtex = gtex->Material[scaleflags];

source/common/textures/hw_material.h

@@ -30,6 +30,8 @@ class FMaterial
 	int mScaleFlags;
 
 public:
+	static void SetLayerCallback(IHardwareTexture* (*layercallback)(int layer, int translation));
+
 	FGameTexture *sourcetex;	// the owning texture. 
 
 	FMaterial(FGameTexture *tex, int scaleflags);

source/common/textures/hw_texcontainer.h

@@ -12,9 +12,9 @@ enum ECreateTexBufferFlags
 	CTF_Expand = 1,			// create buffer with a one-pixel wide border
 	CTF_Upscale = 2,		// Upscale the texture
 	CTF_CreateMask = 3,		// Flags that are relevant for hardware texture creation.
-	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.
-	CTF_Indexed = 16		// Tell the backend to create an indexed texture.
+	CTF_Indexed = 4,		// Tell the backend to create an indexed texture.
+	CTF_ProcessData = 8,	// run postprocessing on the generated buffer. This is only needed when using the data for a hardware texture.
+	CTF_CheckOnly = 16,		// 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.
 };
 
 class FHardwareTextureContainer

source/common/textures/texture.cpp

@@ -527,18 +527,16 @@ outl:
 
 IHardwareTexture* FTexture::GetHardwareTexture(int translation, int scaleflags)
 {
-	//if (UseType != ETextureType::Null)
-	{
+	int indexed = scaleflags & CTF_Indexed;
+	if (indexed) translation = -1;
 	IHardwareTexture* hwtex = SystemTextures.GetHardwareTexture(translation, scaleflags);
 	if (hwtex == nullptr)
 	{
-			hwtex = screen->CreateHardwareTexture(4);
+		hwtex = screen->CreateHardwareTexture(indexed? 1 : 4);
 		SystemTextures.AddHardwareTexture(translation, scaleflags, hwtex);
 	}
 	return hwtex;
 }
-	return nullptr;
-}
 
 
 //==========================================================================

source/duke3d/src/sector.cpp

@@ -393,7 +393,6 @@ static void G_SetupCamTile(int spriteNum, int tileNum, int smoothRatio)
 
     screen->RenderTextureView(canvas, [=](IntRect& rect)
         {
-            // Beware! Apparently this is allowed to render to the camera itself. Breakage is basically guarenteed...
             if (VM_OnEventWithReturn(EVENT_DISPLAYROOMSCAMERATILE, spriteNum, screenpeek, 0) != 1)
             {
                 yax_preparedrawrooms();

source/glbackend/gl_texture.cpp

@@ -78,7 +78,8 @@ bool GLInstance::SetTexture(int picnum, FGameTexture* tex, int paletteid, int sa
 
 	SetBasepalTint(texpick.basepalTint);
 	auto &mat = renderState.mMaterial;
-	mat.mMaterial = FMaterial::ValidateTexture(tex, 0); // todo allow scaling
+	int flags = hw_useindexedcolortextures ? CTF_Indexed : 0;
+	mat.mMaterial = FMaterial::ValidateTexture(tex, flags); // todo allow scaling
 	mat.mClampMode = sampler;
 	mat.mTranslation = texpick.translation;
 	mat.mOverrideShader = 0;

wadsrc/static/engine/menudef.txt

@@ -1578,6 +1578,9 @@ OptionMenu VideoModeMenu //protected
 {
 	Title "$VIDMNU_TITLE"
 
+	// does not work yet.
+	//Option "$VIDMNU_PREFERBACKEND",		"vid_preferbackend", "PreferBackend"
+	//StaticText " "
 	Option "$VIDMNU_FULLSCREEN",		"vid_fullscreen", "YesNo"
 
 	IfOption(Mac)