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vo_opengl: cocoa: output premultiplied alpha

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Which is apparently what is expected here. (I'm pretty sure X11
compositors want stright alpha, so 2 code paths are needed.)
This commit is contained in:
wm4 2015-12-19 13:12:51 +01:00
parent 4cc1861378
commit a0519f1d18
3 changed files with 4 additions and 0 deletions
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1
video/out/opengl/common.h
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@ -92,6 +92,7 @@ struct GL {
int mpgl_caps; // Bitfield of MPGL_CAP_* constants
bool debug_context; // use of e.g. GLX_CONTEXT_DEBUG_BIT_ARB
int fb_r, fb_g, fb_b; // frame buffer bit depth (0 if unknown)
bool fb_premultiplied; // assumption about FB alpha compositor usage
void (GLAPIENTRY *Viewport)(GLint, GLint, GLsizei, GLsizei);
void (GLAPIENTRY *Clear)(GLbitfield);

1
video/out/opengl/context_cocoa.c
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@ -129,6 +129,7 @@ static bool create_gl_context(struct MPGLContext *ctx, int vo_flags)
mpgl_load_functions(ctx->gl, (void *)cocoa_glgetaddr, NULL, ctx->vo->log);
ctx->gl->fb_r = ctx->gl->fb_g = ctx->gl->fb_b = cgl_color_size(ctx);
ctx->gl->fb_premultiplied = true;
CGLReleasePixelFormat(p->pix);

2
video/out/opengl/video.c
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@ -1527,6 +1527,8 @@ static void pass_convert_yuv(struct gl_video *p)
GLSL(color.a = 1.0;)
} else if (p->opts.alpha_mode == 2) { // blend
GLSL(color = vec4(color.rgb * color.a, 1.0);)
} else if (p->gl->fb_premultiplied) {
GLSL(color = vec4(color.rgb * color.a, color.a);)
}
}