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vo_gpu: clamp sigmoid function

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Can explode on some clips otherwise
This commit is contained in:
Niklas Haas 2019-01-03 17:18:58 +01:00 committed by Jan Ekström
parent 258ed5d471
commit b4b719e337
1 changed files with 2 additions and 0 deletions
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2
video/out/gpu/video.c
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@ -2381,6 +2381,7 @@ static void pass_scale_main(struct gl_video *p)
// values at 1 and 0, and then scale/shift them, respectively.
sig_offset = 1.0/(1+expf(sig_slope * sig_center));
sig_scale = 1.0/(1+expf(sig_slope * (sig_center-1))) - sig_offset;
GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
GLSLF("color.rgb = %f - log(1.0/(color.rgb * %f + %f) - 1.0) * 1.0/%f;\n",
sig_center, sig_scale, sig_offset, sig_slope);
pass_opt_hook_point(p, "SIGMOID", NULL);
@ -2408,6 +2409,7 @@ static void pass_scale_main(struct gl_video *p)
GLSLF("// scaler post-conversion\n");
if (use_sigmoid) {
// Inverse of the transformation above
GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
GLSLF("color.rgb = (1.0/(1.0 + exp(%f * (%f - color.rgb))) - %f) * 1.0/%f;\n",
sig_slope, sig_center, sig_offset, sig_scale);
}