diff options
Diffstat (limited to 'video/out/opengl/video_shaders.c')
| -rw-r--r-- | video/out/opengl/video_shaders.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/video/out/opengl/video_shaders.c b/video/out/opengl/video_shaders.c index 1f37f4fed1..4a15b6ceed 100644 --- a/video/out/opengl/video_shaders.c +++ b/video/out/opengl/video_shaders.c @@ -227,6 +227,11 @@ static const float HDR_M1 = 2610./4096 * 1./4, HDR_C2 = 2413./4096 * 32, HDR_C3 = 2392./4096 * 32; +// Common constants for ARIB STD-B67 (Hybrid Log-gamma) +static const float B67_A = 0.17883277, + B67_B = 0.28466892, + B67_C = 0.55991073; + // Linearize (expand), given a TRC as input void pass_linearize(struct gl_shader_cache *sc, enum mp_csp_trc trc) { @@ -265,6 +270,17 @@ void pass_linearize(struct gl_shader_cache *sc, enum mp_csp_trc trc) HDR_C1, HDR_C2, HDR_C3); GLSLF("color.rgb = pow(color.rgb, vec3(1.0/%f));\n", HDR_M1); break; + case MP_CSP_TRC_ARIB_STD_B67: + GLSLF("color.rgb = mix(vec3(4.0) * color.rgb * color.rgb,\n" + " exp((color.rgb - vec3(%f)) / vec3(%f)) + vec3(%f),\n" + " lessThan(vec3(0.5), color.rgb));\n", + B67_C, B67_A, B67_B); + // Since the ARIB function's signal value of 1.0 corresponds to + // a peak of 12.0, we need to renormalize to prevent GL textures + // from clipping. (In general, mpv's internal conversions always + // assume 1.0 is the maximum brightness, not the reference peak) + GLSL(color.rgb /= vec3(12.0);) + break; default: abort(); } @@ -308,6 +324,13 @@ void pass_delinearize(struct gl_shader_cache *sc, enum mp_csp_trc trc) HDR_C1, HDR_C2, HDR_C3); GLSLF("color.rgb = pow(color.rgb, vec3(%f));\n", HDR_M2); break; + case MP_CSP_TRC_ARIB_STD_B67: + GLSL(color.rgb *= vec3(12.0);) + GLSLF("color.rgb = mix(vec3(0.5) * sqrt(color.rgb),\n" + " vec3(%f) * log(color.rgb - vec3(%f)) + vec3(%f),\n" + " lessThan(vec3(1.0), color.rgb));\n", + B67_A, B67_B, B67_C); + break; default: abort(); } |