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Stereo 3D|Client|Refactor: Use libgui to draw Oculus Rift frames
The Oculus Rift barrel distortion was moved to shaders.dei and adapted to use GLBuffer. Created a static vertex buffer for the simple quad used for drawing the distorted screen.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| #version 120 | ||
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| uniform sampler2D texture; | ||
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| varying highp vec2 vTexCoord; | ||
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| const float aspectRatio = 1.0; | ||
| const float distortionScale = 1.714; // TODO check this | ||
| const vec2 screenSize = vec2(0.14976, 0.0936); | ||
| const vec2 screenCenter = 0.5 * screenSize; | ||
| const vec2 lensCenter = vec2(0.57265, 0.5); // left eye | ||
| const vec2 inputCenter = vec2(0.5, 0.5); // I rendered center at center of unwarped image | ||
| const vec2 scale = vec2(0.5/distortionScale, 0.5*aspectRatio/distortionScale); | ||
| const vec2 scaleIn = vec2(2.0, 2.0/aspectRatio); | ||
| const vec4 hmdWarpParam = vec4(1.0, 0.220, 0.240, 0.000); | ||
| const vec4 chromAbParam = vec4(0.996, -0.004, 1.014, 0.0); | ||
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| void main() { | ||
| vec2 tcIn = vTexCoord; | ||
| vec2 uv = vec2(tcIn.x*2, tcIn.y); // unwarped image coordinates (left eye) | ||
| if (tcIn.x > 0.5) // right eye | ||
| uv.x = 2 - 2*tcIn.x; | ||
| vec2 theta = (uv - lensCenter) * scaleIn; | ||
| float rSq = theta.x * theta.x + theta.y * theta.y; | ||
| vec2 rvector = theta * ( hmdWarpParam.x + | ||
| hmdWarpParam.y * rSq + | ||
| hmdWarpParam.z * rSq * rSq + | ||
| hmdWarpParam.w * rSq * rSq * rSq); | ||
| // Chromatic aberration correction | ||
| vec2 thetaBlue = rvector * (chromAbParam.z + chromAbParam.w * rSq); | ||
| vec2 tcBlue = inputCenter + scale * thetaBlue; | ||
| // Blue is farthest out | ||
| if ( (abs(tcBlue.x - 0.5) > 0.5) || (abs(tcBlue.y - 0.5) > 0.5) ) { | ||
| gl_FragColor = vec4(0, 0, 0, 1); | ||
| return; | ||
| } | ||
| vec2 thetaRed = rvector * (chromAbParam.x + chromAbParam.y * rSq); | ||
| vec2 tcRed = inputCenter + scale * thetaRed; | ||
| vec2 tcGreen = inputCenter + scale * rvector; // green | ||
| tcRed.x *= 0.5; // because output only goes to 0-0.5 (left eye) | ||
| tcGreen.x *= 0.5; // because output only goes to 0-0.5 (left eye) | ||
| tcBlue.x *= 0.5; // because output only goes to 0-0.5 (left eye) | ||
| if (tcIn.x > 0.5) { // right eye 0.5-1.0 | ||
| tcRed.x = 1 - tcRed.x; | ||
| tcGreen.x = 1 - tcGreen.x; | ||
| tcBlue.x = 1 - tcBlue.x; | ||
| } | ||
| float red = texture2D(texture, tcRed).r; | ||
| vec2 green = texture2D(texture, tcGreen).ga; | ||
| float blue = texture2D(texture, tcBlue).b; | ||
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| gl_FragColor = vec4(red, green.x, blue, green.y); | ||
| } |
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