Added another material flag to enable front face culling. Can be useful for special effects.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1308 dfc29bdd-3216-0410-991c-e03cc46cb475

include/EMaterialFlags.h

@@ -32,9 +32,12 @@ namespace video
 		//! This flag is ignored, if the material type is a transparent type.
 		EMF_ZWRITE_ENABLE,
 
-		//! Is backfaceculling enabled? Default: true
+		//! Is backface culling enabled? Default: true
 		EMF_BACK_FACE_CULLING,
 
+		//! Is frontface culling enabled? Default: false
+		EMF_FRONT_FACE_CULLING,
+
 		//! Is bilinear filtering enabled? Default: true
 		EMF_BILINEAR_FILTER,
 

include/SMaterial.h

@@ -71,7 +71,7 @@ namespace video
 			EmissiveColor(0,0,0,0), SpecularColor(255,255,255,255),
 			Shininess(0.0f), MaterialTypeParam(0.0f), MaterialTypeParam2(0.0f), Thickness(1.0f),
 			Wireframe(false), PointCloud(false), GouraudShading(true), Lighting(true),
-			ZWriteEnable(true), BackfaceCulling(true),
+			ZWriteEnable(true), BackfaceCulling(true), FrontfaceCulling(false),
 			FogEnable(false), NormalizeNormals(false), ZBuffer(1)
 		{ }
 
@@ -108,6 +108,7 @@ namespace video
 			Lighting = other.Lighting;
 			ZWriteEnable = other.ZWriteEnable;
 			BackfaceCulling = other.BackfaceCulling;
+			FrontfaceCulling = other.FrontfaceCulling;
 			FogEnable = other.FogEnable;
 			NormalizeNormals = other.NormalizeNormals;
 			ZBuffer = other.ZBuffer;
@@ -204,6 +205,9 @@ namespace video
 		//! Is backface culling enabled? Default: true
 		bool BackfaceCulling;
 
+		//! Is frontface culling enabled? Default: false
+		bool FrontfaceCulling;
+
 		//! Is fog enabled? Default: false
 		bool FogEnable;
 
@@ -271,6 +275,8 @@ namespace video
 					ZWriteEnable = value; break;
 				case EMF_BACK_FACE_CULLING:
 					BackfaceCulling = value; break;
+				case EMF_FRONT_FACE_CULLING:
+					FrontfaceCulling = value; break;
 				case EMF_BILINEAR_FILTER:
 				{
 					for (u32 i=0; i<MATERIAL_MAX_TEXTURES; ++i)
@@ -323,6 +329,8 @@ namespace video
 					return ZWriteEnable;
 				case EMF_BACK_FACE_CULLING:
 					return BackfaceCulling;
+				case EMF_FRONT_FACE_CULLING:
+					return FrontfaceCulling;
 				case EMF_BILINEAR_FILTER:
 					return TextureLayer[0].BilinearFilter;
 				case EMF_TRILINEAR_FILTER:
@@ -362,6 +370,7 @@ namespace video
 				ZBuffer != b.ZBuffer ||
 				ZWriteEnable != b.ZWriteEnable ||
 				BackfaceCulling != b.BackfaceCulling ||
+				FrontfaceCulling != b.FrontfaceCulling ||
 				FogEnable != b.FogEnable ||
 				NormalizeNormals != b.NormalizeNormals;
 			for (u32 i=0; (i<MATERIAL_MAX_TEXTURES) && !different; ++i)

source/Irrlicht/CD3D8Driver.cpp

@@ -1305,12 +1305,18 @@ void CD3D8Driver::setBasicRenderStates(const SMaterial& material, const SMateria
 	// back face culling
 
 
-	if (resetAllRenderstates || lastmaterial.BackfaceCulling != material.BackfaceCulling)
+	if (resetAllRenderstates || (lastmaterial.FrontfaceCulling != material.FrontfaceCulling) || (lastmaterial.BackfaceCulling != material.BackfaceCulling))
 	{
+		if (material.FrontfaceCulling && material.BackfaceCulling)
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CW|D3DCULL_CCW);
+		else
+		if (material.FrontfaceCulling)
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CW);
+		else
 		if (material.BackfaceCulling)
-			pID3DDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW);
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CCW);
 		else
-			pID3DDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE);
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
 	}
 
 	// fog

source/Irrlicht/CD3D9Driver.cpp

@@ -1318,12 +1318,18 @@ void CD3D9Driver::setBasicRenderStates(const SMaterial& material, const SMateria
 
 	// back face culling
 
-	if (resetAllRenderstates || lastmaterial.BackfaceCulling != material.BackfaceCulling)
+	if (resetAllRenderstates || (lastmaterial.FrontfaceCulling != material.FrontfaceCulling) || (lastmaterial.BackfaceCulling != material.BackfaceCulling))
 	{
+		if (material.FrontfaceCulling && material.BackfaceCulling)
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CW|D3DCULL_CCW);
+		else
+		if (material.FrontfaceCulling)
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CW);
+		else
 		if (material.BackfaceCulling)
-			pID3DDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CCW);
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_CCW);
 		else
-			pID3DDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE);
+			pID3DDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
 	}
 
 	// fog

source/Irrlicht/CNullDriver.cpp

@@ -1399,6 +1399,7 @@ io::IAttributes* CNullDriver::createAttributesFromMaterial(const video::SMateria
 	attr->addBool("ZWriteEnable", material.ZWriteEnable);
 	attr->addInt("ZBuffer", material.ZBuffer);
 	attr->addBool("BackfaceCulling", material.BackfaceCulling);
+	attr->addBool("FrontfaceCulling", material.FrontfaceCulling);
 	attr->addBool("FogEnable", material.FogEnable);
 	attr->addBool("NormalizeNormals", material.NormalizeNormals);
 
@@ -1454,6 +1455,7 @@ void CNullDriver::fillMaterialStructureFromAttributes(video::SMaterial& outMater
 	outMaterial.ZWriteEnable = attr->getAttributeAsBool("ZWriteEnable");
 	outMaterial.ZBuffer = attr->getAttributeAsInt("ZBuffer");
 	outMaterial.BackfaceCulling = attr->getAttributeAsBool("BackfaceCulling");
+	outMaterial.FrontfaceCulling = attr->getAttributeAsBool("FrontfaceCulling");
 	outMaterial.FogEnable = attr->getAttributeAsBool("FogEnable");
 	outMaterial.NormalizeNormals = attr->getAttributeAsBool("NormalizeNormals");
 	prefix = "BilinearFilter";

source/Irrlicht/COpenGLDriver.cpp

@@ -1685,8 +1685,23 @@ void COpenGLDriver::setBasicRenderStates(const SMaterial& material, const SMater
 	// back face culling
 	if (resetAllRenderStates || lastmaterial.BackfaceCulling != material.BackfaceCulling)
 	{
+		if ((material.FrontfaceCulling) && (material.BackfaceCulling))
+		{
+			glCullFace(GL_FRONT_AND_BACK);
+			glEnable(GL_CULL_FACE);
+		}
+		else
 		if (material.BackfaceCulling)
+		{
+			glCullFace(GL_BACK);
 			glEnable(GL_CULL_FACE);
+		}
+		else
+		if (material.FrontfaceCulling)
+		{
+			glCullFace(GL_FRONT);
+			glEnable(GL_CULL_FACE);
+		}
 		else
 			glDisable(GL_CULL_FACE);
 	}