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gui: take another pass at alpha/gamma stuff

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The prior commit wasn't right, this looks better!

refs: #1049
This commit is contained in:
Wez Furlong 2021-08-19 19:11:59 -07:00
parent 66ff7740c4
commit 98206f0bf8
1 changed files with 14 additions and 42 deletions
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50
wezterm-gui/src/glyph-frag.glsl
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@ -36,7 +36,7 @@ vec3 hsv2rgb(vec3 c)
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
const vec3 unit3 = vec3(1.0, 1.0, 1.0);
const vec3 unit3 = vec3(1.0);
vec4 apply_hsv(vec4 c, vec3 transform)
{
@ -47,55 +47,27 @@ vec4 apply_hsv(vec4 c, vec3 transform)
return vec4(hsv2rgb(hsv).rgb, c.a);
}
vec4 from_linear(vec4 v) {
return pow(v, vec4(2.2));
}
vec4 to_linear(vec4 v) {
return pow(v, vec4(1.0/2.2));
}
// For reasons that I haven't been able to figure out, we need
// to gamma correct the data that we read from the textures that
// are supplied to OpenGL, otherwise they appear too dark.
// AFAICT, I've done what I thought were all of the right things
// (but are perhaps only some of the right things) to tell OpenGL/EGL
// that everything is already SRGB, so this function should really
// just be a call to `texture` and not do the gamma conversion.
vec4 sample_texture(sampler2D s, vec2 coords) {
vec4 color = texture(s, coords);
return color;
// return to_linear(color);
}
void main() {
if (o_has_color == 3.0) {
// Solid color block
color = o_fg_color;
colorMask = vec4(1.0, 1.0, 1.0, 1.0);
colorMask = vec4(1.0);
} else if (o_has_color == 2.0) {
// The window background attachment
color = sample_texture(atlas_linear_sampler, o_tex);
color = texture(atlas_linear_sampler, o_tex);
// Apply window_background_image_opacity to the background image
colorMask = o_fg_color.aaaa;
// don't double up on alpha
color.a = 1.0;
} else {
if (o_has_color == 0.0) {
// if it's not a color emoji or image attachment, then the texture is the color mask
colorMask = sample_texture(atlas_nearest_sampler, o_tex);
colorMask.a = 1.0;
} else if (o_has_color == 1.0) {
// the texture is full color info (eg: color emoji glyph)
color = texture(atlas_nearest_sampler, o_tex);
// this is the alpha
colorMask = color.aaaa;
} else if (o_has_color == 0.0) {
// the texture is the alpha channel/color mask
colorMask = texture(atlas_nearest_sampler, o_tex);
// and we need to tint with the fg_color
color = o_fg_color;
color = apply_hsv(color, foreground_text_hsb);
} else {
// otherwise, the texture is full color info
color = sample_texture(atlas_nearest_sampler, o_tex);
// this is the alpha
colorMask = color.aaaa;
// don't double up on alpha
color.a = 1.0;
}
}
color = apply_hsv(color, o_hsv);