Vertex texture sampling support in Direct3D 9 now controlled via texture-flag ETCF_SUPPORT_VERTEXT_TEXTURE

It's no longer enabled by default as it causes some costs to all texture switches.
Thanks @ edo9300 for reporting (http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=52721)

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6219 dfc29bdd-3216-0410-991c-e03cc46cb475

changes.txt

@@ -1,5 +1,7 @@
 --------------------------
 Changes in 1.9 (not yet released)
+- Add ETCF_SUPPORT_VERTEXT_TEXTURE flag which can be used to enable vertex texture sampling support in Direct3D 9.
+  Note that this was enabled for a long time in 1.9 svn, but is now disabled by default.
 - CGUIListBox now serializes the state of "Selected". Feature wish by chronologicaldot (http://irrlicht.sourceforge.net/forum/viewtopic.php?f=2&t=52719)
 - Bugfix: Changing focus with tab-keys now also work when elements are inside a modal screen.
 - COBJMeshFileLoader using a bit more exact color conversion for 0-1 to 0-255 range (same now as SColorf::toSColor uses).

include/ITexture.h

@@ -97,6 +97,14 @@ enum E_TEXTURE_CREATION_FLAG
 	  */
 	ETCF_AUTO_GENERATE_MIP_MAPS = 0x00000100,
 
+	//! Enable support for vertex shader texture sampling on some drivers
+	/** Default is false.
+	This adds a small costs to all texture switches.
+	Currently only affects D3D9. 
+	On OpenGL vertex shaders use the same texture unit as pixel shaders, so support there only depends on GL version and not on this flag
+	*/
+	ETCF_SUPPORT_VERTEXT_TEXTURE = 0x00000200,
+
 	/** This flag is never used, it only forces the compiler to compile
 	these enumeration values to 32 bit. */
 	ETCF_FORCE_32_BIT_DO_NOT_USE = 0x7fffffff

source/Irrlicht/CD3D9Driver.cpp

@@ -698,12 +698,6 @@ bool CD3D9Driver::setActiveTexture(u32 stage, const video::ITexture* texture)
 	if (CurrentTexture[stage] == texture)
 		return true;
 
-	if (texture && texture->getDriverType() != EDT_DIRECT3D9)
-	{
-		os::Printer::log("Fatal Error: Tried to set a texture not owned by this driver.", ELL_ERROR);
-		return false;
-	}
-
 	CurrentTexture[stage] = texture;
 
 	if (!texture)
@@ -711,13 +705,20 @@ bool CD3D9Driver::setActiveTexture(u32 stage, const video::ITexture* texture)
 		pID3DDevice->SetTexture(stage, 0);
 		pID3DDevice->SetTextureStageState( stage, D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_DISABLE );
 	}
-	else
+	else if (texture->getDriverType() == EDT_DIRECT3D9)
 	{
 		pID3DDevice->SetTexture(stage, ((const CD3D9Texture*)texture)->getDX9BaseTexture());
 
-		if (stage <= 4)
+		if (((const CD3D9Texture*)texture)->HasVertexTextureSupport() && stage < 4 )
             pID3DDevice->SetTexture(D3DVERTEXTEXTURESAMPLER0 + stage, ((const CD3D9Texture*)texture)->getDX9BaseTexture());
 	}
+	else
+	{
+		os::Printer::log("Fatal Error: Tried to set a texture not owned by this driver.", ELL_ERROR);
+		setActiveTexture(stage, 0);
+		return false;
+	}
+
 	return true;
 }
 

source/Irrlicht/CD3D9Texture.cpp

@@ -38,18 +38,20 @@ CD3D9Texture::CD3D9Texture(const io::path& name, const core::array<IImage*>& ima
 
 	DWORD flags = 0;
 
+	LPDIRECT3D9 intf = Driver->getExposedVideoData().D3D9.D3D9;
+	D3DDISPLAYMODE d3ddm;
+	intf->GetAdapterDisplayMode(Driver->Params.DisplayAdapter, &d3ddm);
 	if (HasMipMaps && HardwareMipMaps)
 	{
-		LPDIRECT3D9 intf = Driver->getExposedVideoData().D3D9.D3D9;
-		D3DDISPLAYMODE d3ddm;
-		intf->GetAdapterDisplayMode(Driver->Params.DisplayAdapter, &d3ddm);
-
 		if (D3D_OK == intf->CheckDeviceFormat(Driver->Params.DisplayAdapter, D3DDEVTYPE_HAL, d3ddm.Format, D3DUSAGE_AUTOGENMIPMAP, D3DRTYPE_TEXTURE, InternalFormat))
 			flags = D3DUSAGE_AUTOGENMIPMAP;
 		else
 			HardwareMipMaps = false;
 	}
 	
+	VertexTextureSupport = Driver->getTextureCreationFlag(ETCF_SUPPORT_VERTEXT_TEXTURE) 
+	                       && (D3D_OK == intf->CheckDeviceFormat(Driver->Params.DisplayAdapter, D3DDEVTYPE_HAL, d3ddm.Format, D3DUSAGE_QUERY_VERTEXTEXTURE, D3DRTYPE_TEXTURE, InternalFormat));
+
 	HRESULT hr = 0;
 	
 	switch (Type)

source/Irrlicht/CD3D9Texture.h

@@ -42,6 +42,11 @@ public:
 	IDirect3DTexture9* getDX9Texture() const;
 	IDirect3DCubeTexture9* getDX9CubeTexture() const;
 
+	inline bool HasVertexTextureSupport() const 
+	{
+		return VertexTextureSupport;
+	}
+
 private:
 	friend class CD3D9Driver;
 
@@ -77,6 +82,7 @@ private:
 	u32 MipLevelLocked;
 
 	bool HardwareMipMaps;
+	bool VertexTextureSupport;
 
 	IDirect3DDevice9* Device;
 	IDirect3DTexture9* Texture;