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vo_opengl: blend against background color for --alpha=blend

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Do it after color management, etc. so that it matches the color drawn in
the margins.
This commit is contained in:
Philip Sequeira 2016-11-12 13:19:40 -05:00 committed by wm4
parent 19c9347e47
commit cf85191cb7
2 changed files with 16 additions and 9 deletions
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3
DOCS/man/options.rst
View File

@ -4581,7 +4581,8 @@ The following video options are currently all specific to ``--vo=opengl`` and
blend-tiles
Blend the frame against a 16x16 gray/white tiles background (default).
blend
Blend the frame against a black background.
Blend the frame against the background color (``--background``, normally
black).
yes
Try to create a framebuffer with alpha component. This only makes sense
if the video contains alpha information (which is extremely rare). May

22
video/out/opengl/video.c
View File

@ -2013,8 +2013,6 @@ static void pass_convert_yuv(struct gl_video *p)
p->components = 3;
if (!p->has_alpha || p->opts.alpha_mode == ALPHA_NO) {
GLSL(color.a = 1.0;)
} else if (p->opts.alpha_mode == ALPHA_BLEND) {
GLSL(color = vec4(color.rgb * color.a, 1.0);)
} else { // alpha present in image
p->components = 4;
GLSL(color = vec4(color.rgb * color.a, color.a);)
@ -2537,12 +2535,20 @@ static void pass_draw_to_screen(struct gl_video *p, int fbo)
pass_colormanage(p, p->image_params.color, false);
// Draw checkerboard pattern to indicate transparency
if (p->has_alpha && p->opts.alpha_mode == ALPHA_BLEND_TILES) {
GLSLF("// transparency checkerboard\n");
GLSL(bvec2 tile = lessThan(fract(gl_FragCoord.xy / 32.0), vec2(0.5));)
GLSL(vec3 background = vec3(tile.x == tile.y ? 1.0 : 0.75);)
GLSL(color.rgb = mix(background, color.rgb, color.a);)
if (p->has_alpha){
if (p->opts.alpha_mode == ALPHA_BLEND_TILES) {
// Draw checkerboard pattern to indicate transparency
GLSLF("// transparency checkerboard\n");
GLSL(bvec2 tile = lessThan(fract(gl_FragCoord.xy / 32.0), vec2(0.5));)
GLSL(vec3 background = vec3(tile.x == tile.y ? 1.0 : 0.75);)
GLSL(color.rgb = mix(background, color.rgb, color.a);)
} else if (p->opts.alpha_mode == ALPHA_BLEND) {
// Blend into background color (usually black)
struct m_color c = p->opts.background;
GLSLF("vec4 background = vec4(%f, %f, %f, %f);\n",
c.r / 255.0, c.g / 255.0, c.b / 255.0, c.a / 255.0);
GLSL(color = mix(background, vec4(color.rgb, 1.0), color.a);)
}
}
pass_opt_hook_point(p, "OUTPUT", NULL);