diff options
Diffstat (limited to 'shaders')
| -rw-r--r-- | shaders/decor.frag.glsl | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/shaders/decor.frag.glsl b/shaders/decor.frag.glsl index 77f9c95e..3e2c286f 100644 --- a/shaders/decor.frag.glsl +++ b/shaders/decor.frag.glsl @@ -8,7 +8,7 @@ // colour rides in the cell's ground (a_bg), its coverage in a_fg.r, so the // result is the overlay pipeline's exactly. // -// Soft shadow (flag 0x10000000): a rectangle's shadow blurred by a Gaussian, +// Soft (flag 0x10000000): a rectangle's shadow, rim or glow blurred by a Gaussian, // in closed form (the product of two erf edges), on one quad grown by 3 // sigma: no blur pass. Everything is in the quad's own 0..1 space, so a // track's transform carries it: sigma per axis in the uv, the caster's @@ -62,7 +62,9 @@ void main() { vec2 caster1 = 1.0 - m - v_fg.gb; if (all(greaterThanEqual(p, caster0)) && all(lessThan(p, caster1))) discard; float a = v_fg.r * edge(p.x, m.x, 1.0 - m.x, s.x) * edge(p.y, m.y, 1.0 - m.y, s.y); - a = 1.0 - pow(max(1.0 - a, 0.0), 1.0 / 2.2); + // Black darkens in linear light; a light colour (a rim, a glow) is laid + // on as it is, within ยง8.2's 25%. + if (all(equal(v_bg, vec3(0.0)))) a = 1.0 - pow(max(1.0 - a, 0.0), 1.0 / 2.2); a = clamp(a + (ign(gl_FragCoord.xy) - 0.5) / 255.0, 0.0, 1.0); o_col = vec4(v_bg * opacity, a); } |