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vo_opengl: Ignore approx-gamma for BT.2020-CL 

The details of the non-linear transformation from/to BT.2020's constant
luminance system don't really make sense with any other gamma curve,
since changing the gamma curve completely breaks the chroma channels.
This commit is contained in:
Niklas Haas 2014-12-29 14:48:16 +01:00 committed by wm4
parent 1a6dc9ae44
commit 016bb14804
1 changed files with 9 additions and 2 deletions
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11
video/out/gl_video.c
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@ -1021,8 +1021,8 @@ static void compile_shaders(struct gl_video *p)
// Linear light scaling is only enabled when either color correction
// option (3dlut or srgb) is enabled, otherwise scaling is done in the
// source space. We also need to linearize for constant luminance systems.
if ((!p->is_linear_rgb && use_cms) || use_const_luma) {
// source space.
if (!p->is_linear_rgb && use_cms) {
// We just use the color level range to distinguish between PC
// content like images, which are most likely sRGB, and TV content
// like movies, which are most likely BT.2020
@ -1037,6 +1037,13 @@ static void compile_shaders(struct gl_video *p)
}
}
// We also need to linearize for the constant luminance system. This
// transformation really makes no sense with anything other than the
// official gamma curves, though. This overrides approx-gamma.
if (use_const_luma) {
gamma_fun = MP_CSP_TRC_BT_2020_EXACT;
}
// Figure out the right color spaces we need to convert, if any
enum mp_csp_prim prim_src = p->image_params.primaries, prim_dest;
if (use_cms) {