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vo_opengl: support polar filters of any radius 

We can now truly pass a radius of 3.2383154841662362 or another
real zero of the jinc function to get a better result.
This commit is contained in:
Niklas Haas 2015-02-23 23:52:01 +01:00
parent 71a20f7c98
commit eb70e31cc7
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GPG Key ID: 3BA77D4BFDB10BCE
1 changed files with 7 additions and 6 deletions
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13
video/out/gl_video.c
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@ -814,15 +814,16 @@ static void shader_setup_scaler(char **shader, struct scaler *scaler, int pass)
APPENDF(shader, "#define DEF_SCALER%d \\\n ", unit);
char lut_fn[40];
if (scaler->kernel->polar) {
int radius = (int)scaler->kernel->radius;
double radius = scaler->kernel->radius;
int bound = (int)ceil(radius);
// SAMPLE_CONVOLUTION_POLAR_R(NAME, R, LUT, WEIGHTS_FN, ANTIRING)
APPENDF(shader, "SAMPLE_CONVOLUTION_POLAR_R(%s, %d, %s, WEIGHTS%d, %f)\n",
APPENDF(shader, "SAMPLE_CONVOLUTION_POLAR_R(%s, %f, %s, WEIGHTS%d, %f)\n",
name, radius, lut_tex, unit, scaler->antiring);
// Pre-compute unrolled weights matrix
APPENDF(shader, "#define WEIGHTS%d(LUT) \\\n ", unit);
for (int y = 1-radius; y <= radius; y++) {
for (int x = 1-radius; x <= radius; x++) {
for (int y = 1-bound; y <= bound; y++) {
for (int x = 1-bound; x <= bound; x++) {
// Since we can't know the subpixel position in advance,
// assume a worst case scenario.
int yy = y > 0 ? y-1 : y;
@ -837,11 +838,11 @@ static void shader_setup_scaler(char **shader, struct scaler *scaler, int pass)
// anti-ringing
(x >= 0 && y >= 0 && x <= 1 && y <= 1)
? "PRIMARY" : "HELPER",
(double)radius, x, y);
radius, x, y);
} else if (d < radius) {
// Samples on the edge, these are potential values
APPENDF(shader, "SAMPLE_POLAR_POTENTIAL(LUT, %f, %d, %d) \\\n ",
(double)radius, x, y);
radius, x, y);
}
}
}