refract.cpp #1

//========= Copyright  1996-2005, Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
// $NoKeywords: $
//=============================================================================//

#include "BaseVSShader.h"
#include "SDK_refract_vs20.inc"
#include "SDK_refract_ps20.inc"
#include "convar.h"

#define MAXBLUR 1

DEFINE_FALLBACK_SHADER( SDK_Refract, SDK_Refract_DX90 )

BEGIN_VS_SHADER( SDK_Refract_DX90, 
			  "Help for SDK_Refract" )

	BEGIN_SHADER_PARAMS
		SHADER_PARAM_OVERRIDE( COLOR, SHADER_PARAM_TYPE_COLOR, "{255 255 255}", "unused", SHADER_PARAM_NOT_EDITABLE )
		SHADER_PARAM_OVERRIDE( ALPHA, SHADER_PARAM_TYPE_FLOAT, "1.0", "unused", SHADER_PARAM_NOT_EDITABLE )
		SHADER_PARAM( REFRACTAMOUNT, SHADER_PARAM_TYPE_FLOAT, "2", "" )
		SHADER_PARAM( REFRACTTINT, SHADER_PARAM_TYPE_COLOR, "[1 1 1]", "refraction tint" )
		SHADER_PARAM( NORMALMAP, SHADER_PARAM_TYPE_TEXTURE, "models/shadertest/shader1_normal", "normal map" )
		SHADER_PARAM( BUMPFRAME, SHADER_PARAM_TYPE_INTEGER, "0", "frame number for $bumpmap" )
		SHADER_PARAM( BUMPTRANSFORM, SHADER_PARAM_TYPE_MATRIX, "center .5 .5 scale 1 1 rotate 0 translate 0 0", "$bumpmap texcoord transform" )
		SHADER_PARAM( TIME, SHADER_PARAM_TYPE_FLOAT, "0.0f", "" )
		SHADER_PARAM( BLURAMOUNT, SHADER_PARAM_TYPE_INTEGER, "1", "0, 1, or 2 for how much blur you want" )
		SHADER_PARAM( FADEOUTONSILHOUETTE, SHADER_PARAM_TYPE_BOOL, "1", "0 for no fade out on silhouette, 1 for fade out on sillhouette" )
		SHADER_PARAM( ENVMAP, SHADER_PARAM_TYPE_TEXTURE, "shadertest/shadertest_env", "envmap" )
		SHADER_PARAM( ENVMAPFRAME, SHADER_PARAM_TYPE_INTEGER, "0", "envmap frame number" )
		SHADER_PARAM( ENVMAPTINT, SHADER_PARAM_TYPE_COLOR, "[1 1 1]", "envmap tint" )
		SHADER_PARAM( ENVMAPCONTRAST, SHADER_PARAM_TYPE_FLOAT, "0.0", "contrast 0 == normal 1 == color*color" )
		SHADER_PARAM( ENVMAPSATURATION, SHADER_PARAM_TYPE_FLOAT, "1.0", "saturation 0 == greyscale 1 == normal" )
		SHADER_PARAM( REFRACTTINTTEXTURE, SHADER_PARAM_TYPE_TEXTURE, "models/shadertest/shield", "" )
		SHADER_PARAM( REFRACTTINTTEXTUREFRAME, SHADER_PARAM_TYPE_INTEGER, "0", "" )
		SHADER_PARAM( FRESNELREFLECTION, SHADER_PARAM_TYPE_FLOAT, "1.0", "0.0 == no fresnel, 1.0 == full fresnel" )
		SHADER_PARAM( NOWRITEZ, SHADER_PARAM_TYPE_INTEGER, "0", "0 == write z, 1 = no write z" )
		SHADER_PARAM( MASKED, SHADER_PARAM_TYPE_BOOL, "0", "mask using dest alpha" )
	END_SHADER_PARAMS
// FIXME: doesn't support fresnel!
	SHADER_INIT_PARAMS()
	{
		SET_FLAGS2( MATERIAL_VAR2_NEEDS_TANGENT_SPACES );
		SET_FLAGS( MATERIAL_VAR_TRANSLUCENT );
		if( !params[ENVMAPTINT]->IsDefined() )
		{
			params[ENVMAPTINT]->SetVecValue( 1.0f, 1.0f, 1.0f );
		}
		if( !params[ENVMAPCONTRAST]->IsDefined() )
		{
			params[ENVMAPCONTRAST]->SetFloatValue( 0.0f );
		}
		if( !params[ENVMAPSATURATION]->IsDefined() )
		{
			params[ENVMAPSATURATION]->SetFloatValue( 1.0f );
		}
		if( !params[ENVMAPFRAME]->IsDefined() )
		{
			params[ENVMAPFRAME]->SetIntValue( 0 );
		}
		if( !params[FRESNELREFLECTION]->IsDefined() )
		{
			params[FRESNELREFLECTION]->SetFloatValue( 1.0f );
		}
		if( !params[MASKED]->IsDefined() )
		{
			params[MASKED]->SetIntValue( 0 );
		}
		if( !params[BLURAMOUNT]->IsDefined() )
		{
			params[BLURAMOUNT]->SetIntValue( 0 );
		}
		if( !params[FADEOUTONSILHOUETTE]->IsDefined() )
		{
			params[FADEOUTONSILHOUETTE]->SetIntValue( 0 );
		}
	}

	bool NeedsPowerOfTwoFrameBufferTexture( IMaterialVar **params ) const
	{
		return !params[BASETEXTURE]->IsDefined();
	}

	SHADER_FALLBACK
	{
		if( g_pHardwareConfig->GetDXSupportLevel() < 82 )
			return "SDK_Refract_DX80";

		return 0;
	}

	SHADER_INIT
	{
		if (params[BASETEXTURE]->IsDefined() )
		{
			LoadTexture( BASETEXTURE );
		}
		if (params[NORMALMAP]->IsDefined() )
		{
			LoadBumpMap( NORMALMAP );
		}
		if( params[ENVMAP]->IsDefined() )
		{
			LoadCubeMap( ENVMAP );
		}
		if( params[REFRACTTINTTEXTURE]->IsDefined() )
		{
			LoadTexture( REFRACTTINTTEXTURE );
		}
	}

	SHADER_DRAW
	{
		bool bIsModel = IS_FLAG_SET( MATERIAL_VAR_MODEL );
		bool bHasEnvmap = params[ENVMAP]->IsTexture();
		bool bRefractTintTexture = params[REFRACTTINTTEXTURE]->IsTexture();
		bool bFadeOutOnSilhouette = params[FADEOUTONSILHOUETTE]->GetIntValue() != 0;
		int blurAmount = params[BLURAMOUNT]->GetIntValue();
		bool bMasked = (params[MASKED]->GetIntValue() != 0);
		if( blurAmount < 0 )
		{
			blurAmount = 0;
		}
		else if( blurAmount > MAXBLUR )
		{
			blurAmount = MAXBLUR;
		}
		SHADOW_STATE
		{
			SetInitialShadowState( );

			if ( params[NOWRITEZ]->GetIntValue() != 0 )
			{
				pShaderShadow->EnableDepthWrites( false );
			}

			// Alpha test: FIXME: shouldn't this be handled in Shader_t::SetInitialShadowState
			pShaderShadow->EnableAlphaTest( IS_FLAG_SET(MATERIAL_VAR_ALPHATEST) );

			// If envmap is not specified, the alpha channel is the translucency
			// (If envmap *is* specified, alpha channel is the reflection amount)
			if ( params[NORMALMAP]->IsTexture() && !bHasEnvmap )
			{
				SetDefaultBlendingShadowState( NORMALMAP, false );
			}

			// source render target that contains the image that we are warping.
			pShaderShadow->EnableTexture( SHADER_TEXTURE_STAGE2, true );
			if( g_pHardwareConfig->GetHDRType() == HDR_TYPE_INTEGER )
			{
				pShaderShadow->EnableSRGBRead( SHADER_TEXTURE_STAGE2, true );
			}

			// normal map
			pShaderShadow->EnableTexture( SHADER_TEXTURE_STAGE3, true );
			if( bHasEnvmap )
			{
				// envmap
				pShaderShadow->EnableTexture( SHADER_TEXTURE_STAGE4, true );
				if( g_pHardwareConfig->GetHDRType() == HDR_TYPE_INTEGER )
				{
					pShaderShadow->EnableSRGBRead( SHADER_TEXTURE_STAGE4, true );
				}
			}
			if( bRefractTintTexture )
			{
				// refract tint texture
				pShaderShadow->EnableTexture( SHADER_TEXTURE_STAGE5, true );
			}

			if( g_pHardwareConfig->GetHDRType() != HDR_TYPE_NONE )
			{
				pShaderShadow->EnableSRGBWrite( true );
			}

			int fmt = VERTEX_POSITION | VERTEX_NORMAL;
			int numBoneWeights = 0;
			int userDataSize = 0;
			if( bIsModel )
			{
				numBoneWeights = 3;
				userDataSize = 4;
				fmt |= VERTEX_BONE_INDEX;
			}
			else
			{
				fmt |= VERTEX_TANGENT_S | VERTEX_TANGENT_T;
			}
			pShaderShadow->VertexShaderVertexFormat( fmt, 1, 0, numBoneWeights, userDataSize );

			DECLARE_STATIC_VERTEX_SHADER( sdk_refract_vs20 );
			SET_STATIC_VERTEX_SHADER_COMBO( MODEL,  bIsModel );
			SET_STATIC_VERTEX_SHADER( sdk_refract_vs20 );

			DECLARE_STATIC_PIXEL_SHADER( sdk_refract_ps20 );
			SET_STATIC_PIXEL_SHADER_COMBO( BLUR,  blurAmount );
			SET_STATIC_PIXEL_SHADER_COMBO( FADEOUTONSILHOUETTE,  bFadeOutOnSilhouette );
			SET_STATIC_PIXEL_SHADER_COMBO( CUBEMAP,  bHasEnvmap );
			SET_STATIC_PIXEL_SHADER_COMBO( REFRACTTINTTEXTURE,  bRefractTintTexture );
			SET_STATIC_PIXEL_SHADER_COMBO( MASKED, bMasked );
			SET_STATIC_PIXEL_SHADER( sdk_refract_ps20 );
			DefaultFog();
			if( bMasked )
			{
				EnableAlphaBlending( SHADER_BLEND_ONE_MINUS_SRC_ALPHA, SHADER_BLEND_SRC_ALPHA );
			}
		}
		DYNAMIC_STATE
		{
			pShaderAPI->SetDefaultState();

			if ( params[BASETEXTURE]->IsTexture() )
			{
				BindTexture( SHADER_TEXTURE_STAGE2, BASETEXTURE, FRAME );
			}
			else
			{
				pShaderAPI->BindFBTexture( SHADER_TEXTURE_STAGE2 );
			}

			BindTexture( SHADER_TEXTURE_STAGE3, NORMALMAP, BUMPFRAME );

			if( bHasEnvmap )
			{
				BindTexture( SHADER_TEXTURE_STAGE4, ENVMAP, ENVMAPFRAME );
			}

			if( bRefractTintTexture )
			{
				BindTexture( SHADER_TEXTURE_STAGE5, REFRACTTINTTEXTURE, REFRACTTINTTEXTUREFRAME );
			}

			int numBones	= pShaderAPI->GetCurrentNumBones();

			DECLARE_DYNAMIC_VERTEX_SHADER( sdk_refract_vs20 );
			SET_DYNAMIC_VERTEX_SHADER_COMBO( NUMBONES,  numBones );
			SET_DYNAMIC_VERTEX_SHADER( sdk_refract_vs20 );

			DECLARE_DYNAMIC_PIXEL_SHADER( sdk_refract_ps20 );
			SET_DYNAMIC_PIXEL_SHADER_COMBO( FOGTYPE, pShaderAPI->GetSceneFogMode() );
			SET_DYNAMIC_PIXEL_SHADER( sdk_refract_ps20 );

			SetVertexShaderTextureTransform( VERTEX_SHADER_SHADER_SPECIFIC_CONST_1, BUMPTRANSFORM );

			if( g_pHardwareConfig->GetHDRType() == HDR_TYPE_NONE )
			{
				SetPixelShaderConstant( 0, ENVMAPTINT );
				SetPixelShaderConstant( 1, REFRACTTINT );
			}
			else
			{
				SetPixelShaderConstantGammaToLinear( 0, ENVMAPTINT );
				SetPixelShaderConstantGammaToLinear( 1, REFRACTTINT );
			}
			SetPixelShaderConstant( 2, ENVMAPCONTRAST );
			SetPixelShaderConstant( 3, ENVMAPSATURATION );
			float c5[4] = { params[REFRACTAMOUNT]->GetFloatValue(), 
				params[REFRACTAMOUNT]->GetFloatValue(), 0.0f, 0.0f };
			pShaderAPI->SetPixelShaderConstant( 5, c5, 1 );
		}
		Draw();
	}
END_SHADER