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Diffstat (limited to 'video/out/opengl/video.c')
| -rw-r--r-- | video/out/opengl/video.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/video/out/opengl/video.c b/video/out/opengl/video.c index 76b9d829ab..5a4d17e454 100644 --- a/video/out/opengl/video.c +++ b/video/out/opengl/video.c @@ -1755,7 +1755,21 @@ static void pass_sample(struct gl_video *p, struct img_tex tex, } else if (strcmp(name, "oversample") == 0) { pass_sample_oversample(p->sc, scaler, w, h); } else if (scaler->kernel && scaler->kernel->polar) { - pass_sample_polar(p->sc, scaler, tex.components, p->gl->glsl_version); + // Use a compute shader where possible, fallback to the slower texture + // fragment sampler otherwise. Also use the fragment shader for + // very large kernels to avoid exhausting shmem + if (p->gl->glsl_version < 430 || scaler->kernel->f.radius > 16) { + pass_sample_polar(p->sc, scaler, tex.components, p->gl->glsl_version); + } else { + // For performance we want to load at least as many pixels + // horizontally as there are threads in a warp (32 for nvidia), as + // well as enough to take advantage of shmem parallelism + const int warp_size = 32, threads = 256; + compute_size_minimum(p, warp_size, threads / warp_size); + pass_compute_polar(p->sc, scaler, tex.components, + p->compute_w, p->compute_h, + (float)w / tex.w, (float)h / tex.h); + } } else if (scaler->kernel) { pass_sample_separated(p, tex, scaler, w, h); } else { |