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materialsystem/stdshaders/showz.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Visualize shadow z buffers.  Designed to be used when drawing a screen-aligned
+//          quad with a floating-point z-buffer so that the large z-range is divided down
+//          into visual range of grayscale colors.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "convar.h"
+#include "BaseVSShader.h"
+
+#include "showz_vs20.inc"
+#include "showz_ps20.inc"
+#include "showz_ps20b.inc"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+static ConVar r_showz_power( "r_showz_power", "1.0f", FCVAR_CHEAT );
+
+BEGIN_VS_SHADER_FLAGS( showz, "Help for ShowZ", SHADER_NOT_EDITABLE )
+	BEGIN_SHADER_PARAMS
+		SHADER_PARAM( ALPHADEPTH, SHADER_PARAM_TYPE_INTEGER, "0", "Depth is stored in alpha channel" )
+	END_SHADER_PARAMS
+
+	SHADER_INIT_PARAMS()
+	{
+		if ( !params[ALPHADEPTH]->IsDefined() )
+		{
+			params[ALPHADEPTH]->SetIntValue( 0 );
+		}
+	}
+
+	SHADER_FALLBACK
+	{
+//		if ( g_pHardwareConfig->GetDXSupportLevel() < 90 )
+//			return "Wireframe";
+		return 0;
+	}
+
+	SHADER_INIT
+	{
+	}
+
+	SHADER_DRAW
+	{
+		SHADOW_STATE
+		{
+			pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
+
+			DECLARE_STATIC_VERTEX_SHADER( showz_vs20 );
+			SET_STATIC_VERTEX_SHADER( showz_vs20 );
+
+			if( g_pHardwareConfig->SupportsPixelShaders_2_b() )
+			{
+				DECLARE_STATIC_PIXEL_SHADER( showz_ps20b );
+				SET_STATIC_PIXEL_SHADER_COMBO( DEPTH_IN_ALPHA, params[ALPHADEPTH]->GetIntValue() );
+				SET_STATIC_PIXEL_SHADER( showz_ps20b );
+			}
+			else
+			{
+				DECLARE_STATIC_PIXEL_SHADER( showz_ps20 );
+				SET_STATIC_PIXEL_SHADER_COMBO( DEPTH_IN_ALPHA, params[ALPHADEPTH]->GetIntValue() );
+				SET_STATIC_PIXEL_SHADER( showz_ps20 );
+			}
+
+			pShaderShadow->VertexShaderVertexFormat( VERTEX_POSITION, 1, 0, 0 );
+
+			pShaderShadow->EnableSRGBWrite( true );  // The back buffer is sRGB, we should always set this true!
+		}
+		DYNAMIC_STATE
+		{
+			BindTexture( SHADER_SAMPLER0, BASETEXTURE, FRAME );	// Bind shadow depth map
+
+			DECLARE_DYNAMIC_VERTEX_SHADER( showz_vs20 );
+			SET_DYNAMIC_VERTEX_SHADER( showz_vs20 );
+
+			if( g_pHardwareConfig->SupportsPixelShaders_2_b() )
+			{
+				DECLARE_DYNAMIC_PIXEL_SHADER( showz_ps20b );
+				SET_DYNAMIC_PIXEL_SHADER( showz_ps20b );
+			}
+			else
+			{
+				DECLARE_DYNAMIC_PIXEL_SHADER( showz_ps20 );
+				SET_DYNAMIC_PIXEL_SHADER( showz_ps20 );
+			}
+
+			Vector4D C0;
+			C0.x = r_showz_power.GetFloat();
+
+			pShaderAPI->SetPixelShaderConstant( 0, C0.Base(), 1 );
+		}
+		Draw();
+	}
+END_SHADER
+