diff options
Diffstat (limited to 'video/out/opengl/video_shaders.c')
| -rw-r--r-- | video/out/opengl/video_shaders.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/video/out/opengl/video_shaders.c b/video/out/opengl/video_shaders.c index f56c687903..26f751afb2 100644 --- a/video/out/opengl/video_shaders.c +++ b/video/out/opengl/video_shaders.c @@ -548,8 +548,26 @@ void pass_color_map(struct gl_shader_cache *sc, // Tone map to prevent clipping when the source signal peak exceeds the // encodable range - if (src.sig_peak > dst_range) + if (src.sig_peak > dst_range) { + // Convert to linear, relative XYZ before tone mapping to preserve + // channel balance better + struct mp_csp_primaries prim = mp_get_csp_primaries(src.primaries); + float rgb2xyz[3][3]; + mp_get_rgb2xyz_matrix(prim, rgb2xyz); + gl_sc_uniform_mat3(sc, "rgb2xyz", true, &rgb2xyz[0][0]); + mp_invert_matrix3x3(rgb2xyz); + gl_sc_uniform_mat3(sc, "xyz2rgb", true, &rgb2xyz[0][0]); + // White balance, calculated from the relative XYZ coefficients of + // the white point. Failing to multiply in this difference causes + // the tone mapping process to shift the color temperature. + gl_sc_uniform_vec2(sc, "balance", (float[]){mp_xy_X(prim.white), + mp_xy_Z(prim.white)}); + GLSL(color.xyz = rgb2xyz * color.rgb;) + GLSL(color.xz /= balance;) pass_tone_map(sc, src.sig_peak / dst_range, algo, tone_mapping_param); + GLSL(color.xz *= balance;) + GLSL(color.rgb = xyz2rgb * color.xyz;) + } // Adapt to the right colorspace if necessary if (src.primaries != dst.primaries) { |