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base/renderprogs/stereoWarp.pixel

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+/*
+===========================================================================
+
+Doom 3 BFG Edition GPL Source Code
+Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 
+
+This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  
+
+Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+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.
+
+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.
+
+===========================================================================
+*/
+
+#include "global.inc"
+
+/*
+
+This shader will cover a square block of pixel coordinates, but some of them might
+be scissored off if the edges of the screen or the midpoint divider are visible through
+the optics.
+
+*/
+
+uniform sampler2D samp0 : register(s0);
+
+struct PS_IN {
+	vec4 texcoord0	: TEXCOORD0_centroid;
+};
+
+
+struct PS_OUT {
+	float4 color : COLOR;
+};
+
+void main( PS_IN fragment, out PS_OUT result ) {
+    const float screenWarp_range   = 1.45;
+
+    const vec2    warpCenter = vec2( 0.5, 0.5 );
+    vec2    centeredTexcoord = fragment.texcoord0.xy - warpCenter;
+
+	float	radialLength = length( centeredTexcoord );
+	vec2	radialDir = normalize( centeredTexcoord );
+
+	// get it down into the 0 - PI/2 range
+	float	range = screenWarp_range;
+	float	scaledRadialLength = radialLength * range;
+	float	tanScaled = tan( scaledRadialLength );
+
+    float   rescaleValue = tan( 0.5 * range );
+
+    // If radialLength was 0.5, we want rescaled to also come out
+    // as 0.5, so the edges of the rendered image are at the edges
+    // of the warped image.
+	float	rescaled = tanScaled / rescaleValue;
+
+    vec2	warped = warpCenter + vec2( 0.5, 0.5 ) * radialDir * rescaled;
+
+	result.color = tex2D( samp0, warped );
+}