EMT_TRANSPARENT_ALPHA_CHANNEL_REF working again like in older Irrlicht versions (1.4 or so):

It uses again SMaterial::MaterialTypeParam instead of a hardcoded values and makes an exception when MaterialTypeParam is 0 (using it like 0.5 instead) to ensure it works by default. See http://irrlicht.sourceforge.net/forum/viewtopic.php?f=7&t=48940 for new discussion.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4569 dfc29bdd-3216-0410-991c-e03cc46cb475

include/EMaterialTypes.h

@@ -101,7 +101,7 @@ namespace video
 		EMT_TRANSPARENT_ALPHA_CHANNEL,
 
 		//! Makes the material transparent based on the texture alpha channel.
-		/** If the alpha channel value is greater than 127, a
+		/** If the alpha channel value is greater than a certain value (default 127), a
 		pixel is written to the target, otherwise not. This
 		material does not use alpha blending and is a lot faster
 		than EMT_TRANSPARENT_ALPHA_CHANNEL. It is ideal for drawing
@@ -109,7 +109,12 @@ namespace video
 		blurry but sharp. Only first texture is used. If you are
 		using this material with small textures and 3d object, it
 		is a good idea to load the texture in 32 bit mode
-		(video::IVideoDriver::setTextureCreationFlag()). */
+		(video::IVideoDriver::setTextureCreationFlag()). 
+		By changing SMaterial::MaterialTypeParam you can control the value which is used 
+		to seperate transparent and opaque pixels. The range is 0-1 (corresponding to 0-255 values
+		for the alpha-channel test). 0 is special and like 0.5 interpreted as 127 
+		(if you really want no transparency at all use a very small value above 0)
+		*/
 		EMT_TRANSPARENT_ALPHA_CHANNEL_REF,
 
 		//! Makes the material transparent based on the vertex alpha value.

source/Irrlicht/CD3D8MaterialRenderer.h

@@ -350,7 +350,9 @@ public:
 	{
 		services->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType 
+			|| material.MaterialTypeParam != lastMaterial.MaterialTypeParam 
+			|| resetAllRenderstates)
 		{
 			setTextureColorStage(pID3DDevice, 0,
 				D3DTA_TEXTURE, D3DTOP_MODULATE, D3DTA_CURRENT);
@@ -360,8 +362,7 @@ public:
 
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 
-			// 127 is required by EMT_TRANSPARENT_ALPHA_CHANNEL_REF
-			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, 127);
+			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, material.MaterialTypeParam == 0 ? 127 : material.MaterialTypeParam * 255.f);
 			pID3DDevice->SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATEREQUAL);
 			pID3DDevice->SetRenderState(D3DRS_ALPHATESTENABLE, TRUE);
 		}

source/Irrlicht/CD3D9MaterialRenderer.h

@@ -381,7 +381,9 @@ public:
 	{
 		services->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType 
+			||	material.MaterialTypeParam != lastMaterial.MaterialTypeParam 
+			|| resetAllRenderstates)
 		{
 			setTextureColorStage(pID3DDevice, 0,
 				D3DTA_TEXTURE, D3DTOP_MODULATE, D3DTA_CURRENT);
@@ -391,8 +393,7 @@ public:
 
 			pID3DDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
 
-			// 127 is required by EMT_TRANSPARENT_ALPHA_CHANNEL_REF
-			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, 127);
+			pID3DDevice->SetRenderState(D3DRS_ALPHAREF, material.MaterialTypeParam == 0 ? 127 : material.MaterialTypeParam * 255.f);
 			pID3DDevice->SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATEREQUAL);
 			pID3DDevice->SetRenderState(D3DRS_ALPHATESTENABLE, TRUE);
 		}

source/Irrlicht/COpenGLMaterialRenderer.h

@@ -495,10 +495,12 @@ public:
 		Driver->disableTextures(1);
 		Driver->setBasicRenderStates(material, lastMaterial, resetAllRenderstates);
 
-		if (material.MaterialType != lastMaterial.MaterialType || resetAllRenderstates)
+		if (material.MaterialType != lastMaterial.MaterialType 
+			|| material.MaterialTypeParam != lastMaterial.MaterialTypeParam
+			|| resetAllRenderstates)
 		{
 			Driver->getBridgeCalls()->setAlphaTest(true);
-			Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, 0.5f);
+			Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, material.MaterialTypeParam == 0 ? 0.5 : material.MaterialTypeParam);
 			glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 		}
 	}
@@ -506,7 +508,7 @@ public:
 	virtual void OnSetBaseMaterial(const SMaterial& material) _IRR_OVERRIDE_
 	{
 		Driver->getBridgeCalls()->setAlphaTest(true);
-		Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, 0.5f);
+		Driver->getBridgeCalls()->setAlphaFunc(GL_GREATER, material.MaterialTypeParam == 0 ? 0.5 : material.MaterialTypeParam);
 	}
 
 	virtual void OnUnsetMaterial() _IRR_OVERRIDE_