from @rextimmy new isbackground shader feature. used the same z=w trick we've done before to force things to render behind everything else. applied to fog

Engine/source/environment/skyBox.cpp

@@ -575,8 +575,10 @@ void SkyBox::_initRender()
    mFogBandMat->mDoubleSided = true;
    mFogBandMat->mEmissive[0] = true;
 
+   FeatureSet features = MATMGR->getDefaultFeatures();
+   features.addFeature(MFT_isBackground);
    mFogBandMatInst = mFogBandMat->createMatInstance();
-   mFogBandMatInst->init( MATMGR->getDefaultFeatures(), getGFXVertexFormat<GFXVertexPC>() );
+   mFogBandMatInst->init(features, getGFXVertexFormat<GFXVertexPC>() );
 }
 
 void SkyBox::onStaticModified( const char *slotName, const char *newValue )
@@ -609,6 +611,7 @@ void SkyBox::_initMaterial()
    FeatureSet features = MATMGR->getDefaultFeatures();
    features.removeFeature( MFT_RTLighting );
    features.removeFeature( MFT_Visibility );
+   features.addFeature(MFT_isBackground);   
    features.addFeature(MFT_SkyBox);
 
    // Now initialize the material.

Engine/source/materials/materialFeatureTypes.cpp

@@ -105,6 +105,7 @@ ImplementFeatureType( MFT_ImposterVert, MFG_PreTransform, 1.0, false );
 
 // Deferred Shading
 ImplementFeatureType( MFT_isDeferred, U32(-1), -1, true );
-ImplementFeatureType( MFT_SkyBox, MFG_Transform, 1.0f, false );
+ImplementFeatureType( MFT_isBackground, MFG_Transform, 1.0f, false );
+ImplementFeatureType( MFT_SkyBox, MFG_Transform, 2.0f, false );
 ImplementFeatureType( MFT_HardwareSkinning, MFG_Transform,-2.0, false );
 

Engine/source/materials/materialFeatureTypes.h

@@ -192,6 +192,7 @@ DeclareFeatureType( MFT_HardwareSkinning );
 
 // Deferred Shading
 DeclareFeatureType( MFT_isDeferred );
+DeclareFeatureType( MFT_isBackground );
 DeclareFeatureType( MFT_SkyBox );
 DeclareFeatureType( MFT_MatInfoFlags );
 #endif // _MATERIALFEATURETYPES_H_

Engine/source/materials/processedShaderMaterial.cpp

@@ -452,6 +452,10 @@ void ProcessedShaderMaterial::_determineFeatures(  U32 stageNum,
    // Deferred Shading : Material Info Flags
    fd.features.addFeature(MFT_MatInfoFlags);
 
+   if (features.hasFeature(MFT_isBackground))
+   {
+      fd.features.addFeature(MFT_isBackground);
+   }
    if (features.hasFeature(MFT_SkyBox))
    {
       fd.features.addFeature(MFT_StaticCubemap);

Engine/source/shaderGen/GLSL/shaderFeatureGLSL.cpp

@@ -1743,7 +1743,7 @@ void VertPositionGLSL::processVert( Vector<ShaderComponent*> &componentList,
    
    meta->addStatement( new GenOp( "   @ = tMul(@, vec4(@.xyz,1));\r\n", 
        outPosition, modelview, inPosition ) );   
-   if (fd.materialFeatures[MFT_SkyBox])
+   if (fd.materialFeatures[MFT_isBackground])
    {
 	   meta->addStatement(new GenOp("   @ = @.xyww;\r\n", outPosition, outPosition));
    }

Engine/source/shaderGen/GLSL/shaderGenGLSLInit.cpp

@@ -103,6 +103,7 @@ void _initShaderGenGLSL( ShaderGen *shaderGen )
    FEATUREMGR->registerFeature( MFT_PBRConfigVars, new PBRConfigVarsGLSL );
    FEATUREMGR->registerFeature( MFT_MatInfoFlags, new MatInfoFlagsGLSL );
    FEATUREMGR->registerFeature( MFT_GlowMap, new GlowMapGLSL);
+   FEATUREMGR->registerFeature( MFT_isBackground, new NamedFeatureGLSL("Background Object"));
    FEATUREMGR->registerFeature( MFT_SkyBox, new NamedFeatureGLSL( "skybox" ) );
    FEATUREMGR->registerFeature( MFT_HardwareSkinning, new HardwareSkinningFeatureGLSL );
 }

Engine/source/shaderGen/HLSL/shaderFeatureHLSL.cpp

@@ -1781,7 +1781,7 @@ void VertPositionHLSL::processVert( Vector<ShaderComponent*> &componentList,
    meta->addStatement( new GenOp( "   @ = mul(@, float4(@.xyz,1));\r\n", 
       outPosition, modelview, inPosition ) );
 
-   if (fd.materialFeatures[MFT_SkyBox])
+   if (fd.materialFeatures[MFT_isBackground])
    {
       meta->addStatement(new GenOp("   @ = @.xyww;\r\n", outPosition, outPosition));
    }

Engine/source/shaderGen/HLSL/shaderGenHLSLInit.cpp

@@ -108,6 +108,7 @@ void _initShaderGenHLSL( ShaderGen *shaderGen )
    FEATUREMGR->registerFeature( MFT_PBRConfigVars, new PBRConfigVarsHLSL);
    FEATUREMGR->registerFeature( MFT_MatInfoFlags, new MatInfoFlagsHLSL );
    FEATUREMGR->registerFeature( MFT_GlowMap, new GlowMapHLSL);
+   FEATUREMGR->registerFeature( MFT_isBackground, new NamedFeatureHLSL("Background Object"));
    FEATUREMGR->registerFeature( MFT_SkyBox,  new NamedFeatureHLSL( "skybox" ) );
    FEATUREMGR->registerFeature( MFT_HardwareSkinning, new HardwareSkinningFeatureHLSL );
 }