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materialsystem/stdshaders/modulate_dx6.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Header: $
+// $NoKeywords: $
+//=============================================================================//
+
+#include "shaderlib/cshader.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// FIXME!!  This version doesn't support vertexalpha to make it blend to white!!!
+DEFINE_FALLBACK_SHADER( Modulate, Modulate_DX6 )
+
+BEGIN_SHADER( Modulate_DX6,
+			  "Help for Modulate_DX6" )
+
+	BEGIN_SHADER_PARAMS
+		SHADER_PARAM( WRITEZ, SHADER_PARAM_TYPE_BOOL, "0", "Forces z to be written if set" )
+		SHADER_PARAM( MOD2X, SHADER_PARAM_TYPE_BOOL, "0", "forces a 2x modulate so that you can brighten and darken things" )
+	END_SHADER_PARAMS
+
+	SHADER_INIT_PARAMS()
+	{
+	}
+
+	SHADER_INIT
+	{
+		if (params[BASETEXTURE]->IsDefined())
+			LoadTexture( BASETEXTURE );
+	}
+
+	SHADER_DRAW
+	{
+		bool bMod2X = params[MOD2X]->IsDefined() && params[MOD2X]->GetIntValue();
+		SHADOW_STATE
+		{
+			if( bMod2X )
+			{
+				EnableAlphaBlending( SHADER_BLEND_DST_COLOR, SHADER_BLEND_SRC_COLOR );
+			}
+			else
+			{
+				EnableAlphaBlending( SHADER_BLEND_DST_COLOR, SHADER_BLEND_ZERO );
+			}
+
+			if (params[WRITEZ]->GetIntValue() != 0)
+			{
+				// This overrides the disabling of depth writes performed in
+				// EnableAlphaBlending
+				pShaderShadow->EnableDepthWrites(true);
+			}
+
+			pShaderShadow->EnableConstantColor( true );
+
+			int drawFlags = SHADER_DRAW_POSITION;
+
+			if (params[BASETEXTURE]->IsTexture())
+			{
+				pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
+				drawFlags |= SHADER_DRAW_TEXCOORD0;
+			}
+
+			if (IS_FLAG_SET(MATERIAL_VAR_VERTEXCOLOR))
+			{
+				drawFlags |= SHADER_DRAW_COLOR;
+			}
+
+			pShaderShadow->DrawFlags( drawFlags );
+			// We need to fog to *white* regardless of overbrighting...
+			if( bMod2X )
+			{
+				FogToGrey();
+			}
+			else
+			{
+				FogToOOOverbright();
+			}
+		}
+		DYNAMIC_STATE
+		{
+			if (params[BASETEXTURE]->IsTexture())
+			{
+				BindTexture( SHADER_SAMPLER0, BASETEXTURE, FRAME );
+				SetFixedFunctionTextureTransform( MATERIAL_TEXTURE0, BASETEXTURETRANSFORM );
+			}
+
+			// The constant color is the modulation color...
+			SetColorState( COLOR );
+
+		}
+		Draw( );
+	}
+END_SHADER