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| author | Niklas Haas <git@haasn.xyz> | 2017-07-03 11:23:48 +0200 |
|---|---|---|
| committer | Niklas Haas <git@haasn.xyz> | 2017-07-03 11:51:37 +0200 |
| commit | 8854a2bef61090fdcc6b815112ddd966ef07d771 (patch) | |
| tree | 553ec82e7df0eeff9aa980c00f6ad5c14b385518 /video/out/opengl/video_shaders.c | |
| parent | 41b3b116695bcad3fdb3129b133e2a97d9a76847 (diff) | |
| download | mpv-8854a2bef61090fdcc6b815112ddd966ef07d771.tar.bz2 mpv-8854a2bef61090fdcc6b815112ddd966ef07d771.tar.xz | |
filter_kernels: add radius cutoff functionality
This allows filter functions to be prematurely cut off once their
contributions start becoming insignificant. This effectively prevents
wasted GPU time sampling from parts of the function that are essentially
reduced to zero by the window function, providing anywhere from a 10% to
20% speedup. (5700μs -> 4700μs for me)
Diffstat (limited to 'video/out/opengl/video_shaders.c')
| -rw-r--r-- | video/out/opengl/video_shaders.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/video/out/opengl/video_shaders.c b/video/out/opengl/video_shaders.c index 9e54d33d41..9ed85ffa09 100644 --- a/video/out/opengl/video_shaders.c +++ b/video/out/opengl/video_shaders.c @@ -108,8 +108,10 @@ void pass_sample_separated_gen(struct gl_shader_cache *sc, struct scaler *scaler void pass_sample_polar(struct gl_shader_cache *sc, struct scaler *scaler) { double radius = scaler->kernel->f.radius * scaler->kernel->filter_scale; - int bound = ceil(radius); + double radius_cutoff = scaler->kernel->radius_cutoff; + int bound = ceil(radius_cutoff); bool use_ar = scaler->conf.antiring > 0; + GLSL(color = vec4(0.0);) GLSLF("{\n"); GLSL(vec2 fcoord = fract(pos * size - vec2(0.5));) @@ -130,12 +132,13 @@ void pass_sample_polar(struct gl_shader_cache *sc, struct scaler *scaler) int xx = x > 0 ? x-1 : x; double dmax = sqrt(xx*xx + yy*yy); // Skip samples definitely outside the radius - if (dmax >= radius) + if (dmax >= radius_cutoff) continue; GLSLF("d = length(vec2(%d.0, %d.0) - fcoord)/%f;\n", x, y, radius); // Check for samples that might be skippable - if (dmax >= radius - M_SQRT2) - GLSLF("if (d < 1.0) {\n"); + bool maybe_skippable = dmax >= radius_cutoff - M_SQRT2; + if (maybe_skippable) + GLSLF("if (d < %f) {\n", radius_cutoff / radius); if (scaler->gl_target == GL_TEXTURE_1D) { GLSLF("w = texture1D(lut, LUT_POS(d, %d.0)).r;\n", scaler->lut_size); @@ -150,7 +153,7 @@ void pass_sample_polar(struct gl_shader_cache *sc, struct scaler *scaler) GLSL(lo = min(lo, c);) GLSL(hi = max(hi, c);) } - if (dmax >= radius - M_SQRT2) + if (maybe_skippable) GLSLF("}\n"); } } |