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vo_opengl: make LOOKUP_TEXTURE_SIZE configurable

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Bin Jin 2015-12-05 19:14:23 +00:00 committed by wm4
parent c1a96de41c
commit e6058d3dc3
3 changed files with 14 additions and 4 deletions
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9
DOCS/man/vo.rst
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@ -431,6 +431,15 @@ Available video output drivers are:
Scale parameter (t). Increasing this makes the window wider.
Defaults to 1.
``scaler-lut-size=<4..10>``
Set the size of the lookup texture for scaler kernels (default: 8).
The actual size of the texture is ``2^N`` for an option value of ``N``.
So the lookup texture with the default setting uses 256 samples.
All weights are bilinearly interpolated from those samples, so
increasing the size of lookup table might improve the accuracy of
scaler.
``scaler-resizes-only``
Disable the scaler if the video image is not resized. In that case,
``bilinear`` is used instead whatever is set with ``scale``. Bilinear

8
video/out/opengl/video.c
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@ -49,9 +49,6 @@
#include "video/out/dither.h"
#include "video/out/vo.h"
// Pixel width of 1D lookup textures.
#define LOOKUP_TEXTURE_SIZE 256
// Maximal number of passes that prescaler can be applied.
#define MAX_PRESCALE_PASSES 5
@ -348,6 +345,7 @@ const struct gl_video_opts gl_video_opts_def = {
{{"mitchell", .params={NAN, NAN}}, {.params = {NAN, NAN}},
.clamp = 1, }, // tscale
},
.scaler_lut_size = 8,
.alpha_mode = 2,
.background = {0, 0, 0, 255},
.gamma = 1.0f,
@ -371,6 +369,7 @@ const struct gl_video_opts gl_video_opts_hq_def = {
{{"mitchell", .params={NAN, NAN}}, {.params = {NAN, NAN}},
.clamp = 1, }, // tscale
},
.scaler_lut_size = 8,
.alpha_mode = 2,
.background = {0, 0, 0, 255},
.gamma = 1.0f,
@ -412,6 +411,7 @@ const struct m_sub_options gl_video_conf = {
SCALER_OPTS("dscale", 1),
SCALER_OPTS("cscale", 2),
SCALER_OPTS("tscale", 3),
OPT_INTRANGE("scaler-lut-size", scaler_lut_size, 0, 4, 10),
OPT_FLAG("scaler-resizes-only", scaler_resizes_only, 0),
OPT_FLAG("linear-scaling", linear_scaling, 0),
OPT_FLAG("correct-downscaling", correct_downscaling, 0),
@ -1081,7 +1081,7 @@ static void reinit_scaler(struct gl_video *p, struct scaler *scaler,
gl->BindTexture(target, scaler->gl_lut);
scaler->lut_size = LOOKUP_TEXTURE_SIZE;
scaler->lut_size = 1 << p->opts.scaler_lut_size;
float *weights = talloc_array(NULL, float, scaler->lut_size * size);
mp_compute_lut(scaler->kernel, scaler->lut_size, weights);

1
video/out/opengl/video.h
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@ -71,6 +71,7 @@ struct scaler {
struct gl_video_opts {
int dumb_mode;
struct scaler_config scaler[4];
int scaler_lut_size;
float gamma;
int gamma_auto;
int target_prim;