55 lines
1.8 KiB
Text
55 lines
1.8 KiB
Text
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/************************************************************************************
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Filename : pp_oculus_vr.cg
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Content : Barrel fragment program ported from Oculus SDK Samples to Cg
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Created : July 01, 2013
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Modified by : Jan Boon (Kaetemi)
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Copyright : Copyright 2012 Oculus VR, Inc. All Rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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************************************************************************************/
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void pp_oculus_vr(
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// Per fragment parameters
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float2 texCoord : TEXCOORD0,
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// Fragment program constants
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uniform float2 cLensCenter,
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uniform float2 cScreenCenter,
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uniform float2 cScale,
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uniform float2 cScaleIn,
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uniform float4 cHmdWarpParam,
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uniform sampler2D nlTex0 : TEX0,
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// Output color
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out float4 oCol : COLOR)
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{
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float2 theta = (texCoord - cLensCenter) * cScaleIn; // Scales to [-1, 1]
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float rSq = theta.x * theta.x + theta.y * theta.y;
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float2 theta1 = theta * (cHmdWarpParam.x + cHmdWarpParam.y * rSq +
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cHmdWarpParam.z * rSq * rSq + cHmdWarpParam.w * rSq * rSq * rSq);
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float2 tc = cLensCenter + cScale * theta1;
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if (!all(equal(clamp(tc, cScreenCenter-float2(0.25,0.5), cScreenCenter+float2(0.25,0.5)), tc)))
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{
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oCol = float4(0, 0, 0, 0);
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}
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else
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{
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oCol = tex2D(nlTex0, tc);
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}
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}
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