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materialsystem/stdshaders/filmdust_dx7.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"
+
+DEFINE_FALLBACK_SHADER( FilmDust, FilmDust_DX7 )
+
+BEGIN_SHADER( FilmDust_DX7, "Help for FilmDust_DX7" )
+
+	BEGIN_SHADER_PARAMS
+		SHADER_PARAM( DUST_TEXTURE,   SHADER_PARAM_TYPE_TEXTURE, "0", "Film grain texture" )
+		SHADER_PARAM( CHANNEL_SELECT, SHADER_PARAM_TYPE_VEC4,    "",  "Select which color channel to use" )
+	END_SHADER_PARAMS
+
+	SHADER_INIT_PARAMS()
+	{
+	}
+
+	SHADER_FALLBACK
+	{
+		// Requires DX9 + above
+		if ( g_pHardwareConfig->GetDXSupportLevel() < 70 )
+		{
+			Assert( 0 );
+			return "Wireframe";
+		}
+		return 0;
+	}
+
+	SHADER_INIT
+	{
+		LoadTexture( DUST_TEXTURE );								 
+	}
+
+	SHADER_DRAW
+	{
+		SHADOW_STATE
+		{
+			pShaderShadow->EnableConstantColor( true );
+			pShaderShadow->EnableBlending( true );
+			pShaderShadow->BlendFunc( SHADER_BLEND_ZERO, SHADER_BLEND_ONE_MINUS_SRC_COLOR );
+
+			pShaderShadow->EnableCustomPixelPipe( true );
+			pShaderShadow->CustomTextureStages( 1 );
+			pShaderShadow->CustomTextureOperation( SHADER_TEXTURE_STAGE0, SHADER_TEXCHANNEL_COLOR, SHADER_TEXOP_DOTPRODUCT3, SHADER_TEXARG_CONSTANTCOLOR, SHADER_TEXARG_TEXTURE );
+
+			pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
+		}
+		DYNAMIC_STATE
+		{
+			float color[4];
+			params[CHANNEL_SELECT]->GetVecValue( color, 4 );
+			s_pShaderAPI->Color4fv( color );	
+
+			BindTexture( SHADER_SAMPLER0, DUST_TEXTURE, -1 );
+		}
+		Draw();
+	}
+END_SHADER