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Onek8
2025-01-22 16:18:30 +01:00
parent ed4603cf95
commit a36294b518
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leenkx/Shaders/std/vr.glsl Normal file
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uniform mat4 U; // Undistortion
uniform float maxRadSq;
// GoogleVR Distortion using Vertex Displacement
float distortionFactor(const float rSquared) {
float ret = 0.0;
ret = rSquared * (ret + U[1][1]);
ret = rSquared * (ret + U[0][1]);
ret = rSquared * (ret + U[3][0]);
ret = rSquared * (ret + U[2][0]);
ret = rSquared * (ret + U[1][0]);
ret = rSquared * (ret + U[0][0]);
return ret + 1.0;
}
// Convert point from world space to undistorted camera space
vec4 undistort(const mat4 WV, vec4 pos) {
// Go to camera space
pos = WV * pos;
const float nearClip = 0.1;
if (pos.z <= -nearClip) { // Reminder: Forward is -Z
// Undistort the point's coordinates in XY
float r2 = clamp(dot(pos.xy, pos.xy) / (pos.z * pos.z), 0.0, maxRadSq);
pos.xy *= distortionFactor(r2);
}
return pos;
}