diff options
Diffstat (limited to 'video/out/gl_video.c')
| -rw-r--r-- | video/out/gl_video.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/video/out/gl_video.c b/video/out/gl_video.c index c58521ed49..7400ffba0f 100644 --- a/video/out/gl_video.c +++ b/video/out/gl_video.c @@ -954,9 +954,29 @@ 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; // SAMPLE_CONVOLUTION_POLAR_R(NAME, R, LUT) - APPENDF(shader, "SAMPLE_CONVOLUTION_POLAR_R(%s, %d, %s)\n", - name, (int)scaler->kernel->radius, lut_tex); + APPENDF(shader, "SAMPLE_CONVOLUTION_POLAR_R(%s, %d, %s, WEIGHTS%d)\n", + name, radius, lut_tex, unit); + + // 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++) { + // Since we can't know the subpixel position in advance, + // assume a worst case scenario. + int yy = y > 0 ? y-1 : y; + int xx = x > 0 ? x-1 : x; + double d = sqrt(xx*xx + yy*yy); + + // Samples outside the radius are unnecessary + if (d < radius) { + APPENDF(shader, "SAMPLE_POLAR(LUT, %f, %d, %d) \\\n ", + (double)radius, x, y); + } + } + } + APPENDF(shader, "\n"); } else { if (size == 2 || size == 6) { snprintf(lut_fn, sizeof(lut_fn), "weights%d", size); |