mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 06:36:54 +00:00
91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
|
//========= 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( Shadow, Shadow_DX6 )
|
||
|
|
|
||
|
|
BEGIN_SHADER_FLAGS( Shadow_DX6, "Help for Shadow_DX6", SHADER_NOT_EDITABLE )
|
||
|
|
|
||
|
|
BEGIN_SHADER_PARAMS
|
||
|
|
END_SHADER_PARAMS
|
||
|
|
|
||
|
|
SHADER_INIT_PARAMS()
|
||
|
|
{
|
||
|
|
// FIXME: Need fallback for dx5, don't fade out shadows, just pop them out
|
||
|
|
|
||
|
|
/*
|
||
|
|
The alpha blending state either must be:
|
||
|
|
|
||
|
|
Src Color * Dst Color + Dst Color * 0
|
||
|
|
(src color = C*A + 1-A)
|
||
|
|
|
||
|
|
or
|
||
|
|
|
||
|
|
// Can't be this, doesn't work with fog
|
||
|
|
Src Color * Dst Color + Dst Color * (1-Src Alpha)
|
||
|
|
(src color = C * A, Src Alpha = A)
|
||
|
|
|
||
|
|
*/
|
||
|
|
}
|
||
|
|
|
||
|
|
SHADER_INIT
|
||
|
|
{
|
||
|
|
if (params[BASETEXTURE]->IsDefined())
|
||
|
|
LoadTexture( BASETEXTURE );
|
||
|
|
}
|
||
|
|
|
||
|
|
SHADER_DRAW
|
||
|
|
{
|
||
|
|
SHADOW_STATE
|
||
|
|
{
|
||
|
|
pShaderShadow->EnableTexture( SHADER_SAMPLER0, true );
|
||
|
|
pShaderShadow->EnableTexture( SHADER_SAMPLER1, true );
|
||
|
|
|
||
|
|
// To accomplish shadow fading, subtract vertex alpha from texture alpha
|
||
|
|
// color channel isn't used...
|
||
|
|
pShaderShadow->EnableCustomPixelPipe( true );
|
||
|
|
pShaderShadow->CustomTextureStages( 2 );
|
||
|
|
pShaderShadow->CustomTextureOperation( SHADER_TEXTURE_STAGE0,
|
||
|
|
SHADER_TEXCHANNEL_COLOR, SHADER_TEXOP_SELECTARG1,
|
||
|
|
SHADER_TEXARG_TEXTURE, SHADER_TEXARG_VERTEXCOLOR );
|
||
|
|
pShaderShadow->CustomTextureOperation( SHADER_TEXTURE_STAGE0,
|
||
|
|
SHADER_TEXCHANNEL_ALPHA, SHADER_TEXOP_SUBTRACT,
|
||
|
|
SHADER_TEXARG_TEXTURE, SHADER_TEXARG_VERTEXCOLOR );
|
||
|
|
|
||
|
|
// Blend between white and the vertex color...
|
||
|
|
pShaderShadow->CustomTextureOperation( SHADER_TEXTURE_STAGE1,
|
||
|
|
SHADER_TEXCHANNEL_COLOR, SHADER_TEXOP_BLEND_PREVIOUSSTAGEALPHA,
|
||
|
|
SHADER_TEXARG_CONSTANTCOLOR, SHADER_TEXARG_TEXTURE );
|
||
|
|
pShaderShadow->CustomTextureOperation( SHADER_TEXTURE_STAGE1,
|
||
|
|
SHADER_TEXCHANNEL_ALPHA, SHADER_TEXOP_SELECTARG1,
|
||
|
|
SHADER_TEXARG_PREVIOUSSTAGE, SHADER_TEXARG_VERTEXCOLOR );
|
||
|
|
|
||
|
|
EnableAlphaBlending( SHADER_BLEND_DST_COLOR, SHADER_BLEND_ZERO );
|
||
|
|
pShaderShadow->DrawFlags( SHADER_DRAW_POSITION | SHADER_DRAW_COLOR |
|
||
|
|
SHADER_DRAW_TEXCOORD0 | SHADER_DRAW_TEXCOORD1 );
|
||
|
|
// We need to fog to *white* regardless of overbrighting...
|
||
|
|
FogToWhite();
|
||
|
|
}
|
||
|
|
DYNAMIC_STATE
|
||
|
|
{
|
||
|
|
BindTexture( SHADER_SAMPLER0, BASETEXTURE, FRAME );
|
||
|
|
BindTexture( SHADER_SAMPLER1, BASETEXTURE, FRAME );
|
||
|
|
SetFixedFunctionTextureTransform( MATERIAL_TEXTURE0, BASETEXTURETRANSFORM );
|
||
|
|
SetFixedFunctionTextureTransform( MATERIAL_TEXTURE1, BASETEXTURETRANSFORM );
|
||
|
|
|
||
|
|
// The constant color is the shadow color...
|
||
|
|
SetColorState( COLOR );
|
||
|
|
}
|
||
|
|
Draw( );
|
||
|
|
}
|
||
|
|
END_SHADER
|