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36 lines
1.2 KiB
GLSL
36 lines
1.2 KiB
GLSL
#version 120
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//
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// oculus.frag
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// fragment shader
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//
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// Created by Andrzej Kapolka on 11/26/13.
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// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
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//
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// this shader is an adaptation (HLSL -> GLSL, removed conditional) of the one in the Oculus sample
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// code (Samples/OculusRoomTiny/RenderTiny_D3D1X_Device.cpp), which is under the Apache license
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// (http://www.apache.org/licenses/LICENSE-2.0)
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//
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uniform sampler2D texture;
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uniform vec2 lensCenter;
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uniform vec2 screenCenter;
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uniform vec2 scale;
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uniform vec2 scaleIn;
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uniform vec4 hmdWarpParam;
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vec2 hmdWarp(vec2 in01) {
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vec2 theta = (in01 - lensCenter) * scaleIn;
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float rSq = theta.x * theta.x + theta.y * theta.y;
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vec2 theta1 = theta * (hmdWarpParam.x + hmdWarpParam.y * rSq +
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hmdWarpParam.z * rSq * rSq + hmdWarpParam.w * rSq * rSq * rSq);
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return lensCenter + scale * theta1;
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}
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void main(void) {
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vec2 tc = hmdWarp(gl_TexCoord[0].st);
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vec2 below = step(screenCenter.st + vec2(-0.25, -0.5), tc.st);
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vec2 above = vec2(1.0, 1.0) - step(screenCenter.st + vec2(0.25, 0.5), tc.st);
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gl_FragColor = mix(vec4(0.0, 0.0, 0.0, 1.0), texture2D(texture, tc), above.s * above.t * below.s * below.t);
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}
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