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#version 450
// Sample the glyph atlas (R = coverage 0..1) and mix the cell's bg up to its fg
// by that coverage. Output is PREMULTIPLIED: an opaque cell is unchanged.
// WindowOpacity changes only the ground's coverage, never the glyph's ink.
// A cell whose background is the see-through ground (config.gui_transparent,
// a theme with no bg of its own) still contributes only its ink, at the ink's
// own coverage, so the compositor keeps the rest.
layout(set = 2, binding = 0) uniform sampler2D u_atlas;
layout(std140, set = 3, binding = 0) uniform UiUniforms {
float background_opacity;
} u_ui;
layout(location = 0) in vec2 v_uv;
layout(location = 1) in vec3 v_fg;
layout(location = 2) in vec3 v_bg;
layout(location = 3) in vec2 v_cell_uv;
layout(location = 4) flat in uvec4 v_effect;
layout(location = 0) out vec4 o_col;
float cellNoise(uint serial, uint col, uint row) {
uint x = serial ^ (col * 0x9e3779b9u) ^ (row * 0x85ebca6bu);
x ^= x >> 16;
x *= 0x7feb352du;
x ^= x >> 15;
x *= 0x846ca68bu;
x ^= x >> 16;
return float(x & 0xffffu) / 65535.0;
}
void main() {
float a = texture(u_atlas, v_uv).r;
bool oldLayer = (v_effect.x & 0x80000000u) != 0u;
// A block cursor is foreground chrome even though its fill occupies the
// cell background: keep it visible at WindowOpacity 0. Otherwise a clear
// theme ground has no coverage and ordinary backgrounds use the setting.
// The three high flags are shared with ui.vert.glsl and src/gui/gui.zig.
float bgA = (v_effect.x & 0x20000000u) != 0u ? 1.0
: (v_effect.x & 0x40000000u) != 0u ? 0.0
: clamp(u_ui.background_opacity, 0.0, 1.0);
uint effect = v_effect.x & 0x1fffffffu;
float progress = clamp(uintBitsToFloat(v_effect.y), 0.0, 1.0);
uint cellCol = v_effect.w & 0xffffu;
uint cellRow = v_effect.w >> 16;
float noise = cellNoise(v_effect.z, cellCol, cellRow);
// Ink over ground, both premultiplied: v_fg*a + (v_bg*bgA)*(1-a), which is
// mix() with the ground already premultiplied. At bgA = 1 that is exactly
// the mix(v_bg, v_fg, a) at alpha 1 this shader always wrote.
vec4 cell = vec4(mix(v_bg * bgA, v_fg, a), mix(bgA, 1.0, a));
// 3 = data dissolve. Changed cells retain the frozen old cell until their
// stable threshold, then atomically become the new cell. Exact endpoints
// mirror panel_animation.dissolveRevealed, including the zero hash.
if (effect == 3u) {
bool reveal = progress >= 1.0 || (progress > 0.0 && noise < progress);
if (oldLayer ? reveal : !reveal) discard;
o_col = cell;
return;
}
// FreeType's hinted grayscale bitmap is already the intended coverage.
// Preserve it exactly; weight-changing gamma hacks blur small stems.
o_col = cell;
}
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