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62 lines
2.6 KiB
Text
62 lines
2.6 KiB
Text
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/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include "global.inc"
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struct PS_IN {
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float4 position : VPOS;
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float4 texcoord0 : TEXCOORD0_centroid;
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};
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struct PS_OUT {
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float4 color : COLOR;
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};
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uniform sampler2D samp0 : register(s0);
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static float2 screenPosToTexcoord( float2 pos, float4 bias_scale ) { return ( pos * bias_scale.zw + bias_scale.xy ); }
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void main( PS_IN fragment, out PS_OUT result ) {
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const float renderWidth = 1280.0f;
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const float renderHeight = 720.0f;
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const float4 positionToViewTexture = float4( 0.5f / renderWidth, 0.5f / renderHeight, 1.0f / renderWidth, 1.0f / renderHeight );
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float interpolatedZOverW = ( 1.0 - ( fragment.texcoord0.z / fragment.texcoord0.w ) );
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float3 pos;
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pos.z = 1.0 / interpolatedZOverW;
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pos.xy = pos.z * ( 2.0 * screenPosToTexcoord( fragment.position.xy, positionToViewTexture ) - 1.0 );
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float3 normal = normalize( cross( ddy( pos ), ddx( pos ) ) );
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// light is above and to the right in the eye plane
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float3 L = normalize( float3( 1.0, 1.0, 0.0 ) - pos );
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result.color.xyz = _float3( dot3( normal, L ) * 0.75 );
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result.color.w = 1.0;
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}
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