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https://github.com/mpv-player/mpv
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vo_opengl: blend-subtitles in non-linear light
This commit is contained in:
Niklas Haas
parent
5704055635
commit
27d57af450
@ -1478,6 +1478,9 @@ static void get_scale_factors(struct gl_video *p, double xy[2])
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// Linearize, given a TRC as input
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static void pass_linearize(struct gl_video *p, enum mp_csp_trc trc)
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{
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if (trc == MP_CSP_TRC_LINEAR)
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return;
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GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
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switch (trc) {
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case MP_CSP_TRC_SRGB:
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@ -1495,6 +1498,30 @@ static void pass_linearize(struct gl_video *p, enum mp_csp_trc trc)
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}
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}
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// Delinearize, given a TRC as output
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static void pass_delinearize(struct gl_video *p, enum mp_csp_trc trc)
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{
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if (trc == MP_CSP_TRC_LINEAR)
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return;
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GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
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switch (trc) {
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case MP_CSP_TRC_SRGB:
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GLSL(color.rgb = mix(color.rgb * vec3(12.92),
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vec3(1.055) * pow(color.rgb,
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vec3(1.0/2.4))
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- vec3(0.055),
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lessThanEqual(vec3(0.0031308), color.rgb));)
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break;
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case MP_CSP_TRC_BT_1886:
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GLSL(color.rgb = pow(color.rgb, vec3(1.0/1.961));)
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break;
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case MP_CSP_TRC_GAMMA22:
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GLSL(color.rgb = pow(color.rgb, vec3(1.0/2.2));)
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break;
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}
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}
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// Takes care of the main scaling and pre/post-conversions
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static void pass_scale_main(struct gl_video *p)
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{
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@ -1619,10 +1646,8 @@ static void pass_colormanage(struct gl_video *p, enum mp_csp_prim prim_src,
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bool need_cms = prim_src != prim_dst || p->use_lut_3d;
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bool need_gamma = trc_src != trc_dst || need_cms;
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if (need_gamma && trc_src != MP_CSP_TRC_LINEAR) {
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if (need_gamma)
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pass_linearize(p, trc_src);
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}
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// Adapt to the right colorspace if necessary
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if (prim_src != prim_dst) {
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struct mp_csp_primaries csp_src = mp_get_csp_primaries(prim_src),
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@ -1632,7 +1657,6 @@ static void pass_colormanage(struct gl_video *p, enum mp_csp_prim prim_src,
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gl_sc_uniform_mat3(p->sc, "cms_matrix", true, &m[0][0]);
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GLSL(color.rgb = cms_matrix * color.rgb;)
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}
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if (p->use_lut_3d) {
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gl_sc_uniform_sampler(p->sc, "lut_3d", GL_TEXTURE_3D, TEXUNIT_3DLUT);
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// For the 3DLUT we are arbitrarily using 2.4 as input gamma to reduce
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@ -1641,25 +1665,8 @@ static void pass_colormanage(struct gl_video *p, enum mp_csp_prim prim_src,
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GLSL(color.rgb = pow(color.rgb, vec3(1.0/2.4));)
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GLSL(color.rgb = texture3D(lut_3d, color.rgb).rgb;)
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}
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if (need_gamma && trc_dst != MP_CSP_TRC_LINEAR) {
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GLSL(color.rgb = clamp(color.rgb, 0.0, 1.0);)
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switch (trc_dst) {
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case MP_CSP_TRC_SRGB:
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GLSL(color.rgb = mix(color.rgb * vec3(12.92),
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vec3(1.055) * pow(color.rgb,
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vec3(1.0/2.4))
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- vec3(0.055),
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lessThanEqual(vec3(0.0031308), color.rgb));)
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break;
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case MP_CSP_TRC_BT_1886:
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GLSL(color.rgb = pow(color.rgb, vec3(1.0/1.961));)
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break;
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case MP_CSP_TRC_GAMMA22:
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GLSL(color.rgb = pow(color.rgb, vec3(1.0/2.2));)
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break;
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}
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}
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if (need_gamma)
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pass_delinearize(p, trc_dst);
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}
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static void pass_dither(struct gl_video *p)
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@ -1760,11 +1767,11 @@ static void pass_dither(struct gl_video *p)
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dither_quantization);
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}
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// Draws the OSD, in linear light. If blend is true, subtitles are treated as
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// scene-referred, otherwise they are assumed sRGB and adapted to the output
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// Draws the OSD, in scene-referred colors.. If cms is true, subtitles are
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// instead adapted to the display's gamut.
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static void pass_draw_osd(struct gl_video *p, int draw_flags, double pts,
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struct mp_osd_res rect, int vp_w, int vp_h, int fbo,
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bool blend)
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bool cms)
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{
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mpgl_osd_generate(p->osd, rect, pts, p->image_params.stereo_out, draw_flags);
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@ -1789,14 +1796,9 @@ static void pass_draw_osd(struct gl_video *p, int draw_flags, double pts,
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default:
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abort();
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}
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// subtitle color management
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if (blend) {
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// Scene referred: no gamut adaptation needed, and implicit trc
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pass_linearize(p, p->image_params.gamma);
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} else {
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// Assume sRGB (BT.709 primaries) and adapt to output
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// Subtitle color management, they're assumed to be sRGB by default
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if (cms)
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pass_colormanage(p, MP_CSP_PRIM_BT_709, MP_CSP_TRC_SRGB);
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}
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gl_sc_set_vao(p->sc, mpgl_osd_get_vao(p->osd));
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gl_sc_gen_shader_and_reset(p->sc);
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mpgl_osd_draw_part(p->osd, vp_w, vp_h, n);
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@ -1832,13 +1834,18 @@ static void pass_render_frame(struct gl_video *p)
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get_scale_factors(p, scale);
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rect.ml *= scale[0]; rect.mr *= scale[0];
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rect.mt *= scale[1]; rect.mb *= scale[1];
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// We should always blend subtitles in non-linear light
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if (p->use_linear)
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pass_delinearize(p, p->image_params.gamma);
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finish_pass_fbo(p, &p->blend_subs_fbo, vp_w, vp_h, 0, FBOTEX_FUZZY);
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double vpts = p->image.mpi->pts;
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if (vpts == MP_NOPTS_VALUE)
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vpts = p->osd_pts;
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pass_draw_osd(p, OSD_DRAW_SUB_ONLY, vpts, rect, vp_w, vp_h,
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p->blend_subs_fbo.fbo, p->use_linear);
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p->blend_subs_fbo.fbo, false);
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GLSL(vec4 color = texture(texture0, texcoord0);)
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if (p->use_linear)
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pass_linearize(p, p->image_params.gamma);
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}
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}
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@ -2029,7 +2036,7 @@ void gl_video_render_frame(struct gl_video *p, int fbo, struct frame_timing *t)
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if (p->osd) {
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pass_draw_osd(p, p->opts.blend_subs ? OSD_DRAW_OSD_ONLY : 0,
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p->osd_pts, p->osd_rect, p->vp_w, p->vp_h, fbo, false);
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p->osd_pts, p->osd_rect, p->vp_w, p->vp_h, fbo, true);
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debug_check_gl(p, "after OSD rendering");
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}
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