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#version 100
precision mediump float;
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
// NOTE: Add here your custom variables
uniform vec2 leftLensCenter;
uniform vec2 rightLensCenter;
uniform vec2 leftScreenCenter;
uniform vec2 rightScreenCenter;
uniform vec2 scale;
uniform vec2 scaleIn;
uniform vec4 deviceWarpParam;
uniform vec4 chromaAbParam;
void main()
{
// Compute lens distortion
vec2 lensCenter = fragTexCoord.x < 0.5? leftLensCenter : rightLensCenter;
vec2 screenCenter = fragTexCoord.x < 0.5? leftScreenCenter : rightScreenCenter;
vec2 theta = (fragTexCoord - lensCenter)*scaleIn;
float rSq = theta.x*theta.x + theta.y*theta.y;
vec2 theta1 = theta*(deviceWarpParam.x + deviceWarpParam.y*rSq + deviceWarpParam.z*rSq*rSq + deviceWarpParam.w*rSq*rSq*rSq);
vec2 thetaBlue = theta1*(chromaAbParam.z + chromaAbParam.w*rSq);
vec2 tcBlue = lensCenter + scale*thetaBlue;
if (any(bvec2(clamp(tcBlue, screenCenter - vec2(0.25, 0.5), screenCenter + vec2(0.25, 0.5)) - tcBlue)))
{
// Set black fragment for everything outside the lens border
gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
else
{
// Compute color chroma aberration
float blue = texture2D(texture0, tcBlue).b;
vec2 tcGreen = lensCenter + scale*theta1;
float green = texture2D(texture0, tcGreen).g;
vec2 thetaRed = theta1*(chromaAbParam.x + chromaAbParam.y*rSq);
vec2 tcRed = lensCenter + scale*thetaRed;
float red = texture2D(texture0, tcRed).r;
gl_FragColor = vec4(red, green, blue, 1.0);
}
}
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