vo_opengl: refactor HDR mechanism

Instead of doing HDR tone mapping on an ad-hoc basis inside
pass_colormanage, the reference peak of an image is now part of the
image params (alongside colorspace, gamma, etc.) and tone mapping is
done whenever peak_src != peak_dst.

To get sensible behavior when mixing HDR and SDR content and displays,
target-brightness is a generic filler for "the assumed brightness of SDR
content".

This gets rid of the weird display_scaled hack, sets the framework
for multiple HDR functions with difference reference peaks, and allows
us to (in a future commit) autodetect the right source peak from
the HDR metadata.

(Apart from metadata, the source peak can also be controlled via
vf_format. For HDR content this adjusts the overall image brightness,
for SDR content it's like simulating a different exposure)

1 files changed, 1 insertions, 0 deletions

diff --git a/video/mp_image.h b/video/mp_image.h
index 0a43093ecb..18d25968c0 100644
--- a/video/mp_image.h
+++ b/video/mp_image.h
@@ -47,6 +47,7 @@ struct mp_image_params {
     enum mp_csp_levels colorlevels;
     enum mp_csp_prim primaries;
     enum mp_csp_trc gamma;
+    float peak; // 0 = auto/unknown
     enum mp_chroma_location chroma_location;
     // The image should be rotated clockwise (0-359 degrees).
     int rotate;