Split shell, settings, and compositor into focused modules

compositor/src/render/shaders/blur_shader.frag

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+#version 100
+//_DEFINES_
+#if defined(EXTERNAL)
+#extension GL_OES_EGL_image_external : require
+#endif
+precision highp float;
+#if defined(EXTERNAL)
+uniform samplerExternalOES tex;
+#else
+uniform sampler2D tex;
+#endif
+uniform float alpha;
+uniform vec4 visible_rect;
+uniform float material_radius;
+uniform vec2 texture_size;
+uniform vec2 capture_origin;
+uniform float blur_radius;
+uniform float presentation_alpha;
+uniform float background_opacity;
+uniform vec4 tint;
+varying vec2 v_coords;
+void main() {
+    vec2 half_size = visible_rect.zw * 0.5;
+    vec2 d = abs(gl_FragCoord.xy - visible_rect.xy - half_size) - (half_size - vec2(material_radius));
+    float sdf = length(max(d, 0.0)) + min(max(d.x, d.y), 0.0) - material_radius;
+    float coverage = alpha * presentation_alpha * (1.0 - smoothstep(-0.5, 0.5, sdf));
+    if (coverage <= 0.0) { gl_FragColor = vec4(0.0); return; }
+    vec2 coords = (gl_FragCoord.xy - capture_origin) / texture_size;
+    vec4 color = vec4(0.0);
+    float weights = 0.0;
+    // A spiral avoids aligning the sampling lattice with wallpaper patterns.
+    for (int i = 0; i < 256; i++) {
+        float radius = sqrt((float(i) + 0.5) / 256.0);
+        float angle = float(i) * 2.39996323;
+        vec2 offset = vec2(cos(angle), sin(angle)) * radius * blur_radius / texture_size;
+        float weight = exp(-4.5 * radius * radius);
+        color += texture2D(tex, coords + offset) * weight;
+        weights += weight;
+    }
+    vec3 background = color.rgb / weights;
+    gl_FragColor = vec4(mix(background, tint.rgb, tint.a * background_opacity) * coverage, coverage);
+}

compositor/src/render/shaders/material_shader.frag

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+
+precision highp float;
+uniform float alpha;
+uniform vec4 tint;
+uniform vec4 visible_rect;
+uniform float material_radius;
+uniform float paint_mode;
+uniform vec4 shadow_rect;
+uniform vec2 shadow_values;
+varying vec2 v_coords;
+
+float rounded_distance(vec2 point, vec4 rect) {
+    vec2 half_size = rect.zw * 0.5;
+    float radius = min(material_radius, min(half_size.x, half_size.y));
+    vec2 d = abs(point - rect.xy - half_size) - (half_size - vec2(radius));
+    return length(max(d, 0.0)) + min(max(d.x, d.y), 0.0) - radius;
+}
+void main() {
+    float sdf = rounded_distance(gl_FragCoord.xy, visible_rect);
+    float coverage = 1.0 - smoothstep(-0.5, 0.5, sdf);
+    if (paint_mode > 0.5) {
+        float distance = max(rounded_distance(gl_FragCoord.xy, shadow_rect), 0.0);
+        float sigma = max(shadow_values.x * 0.5, 0.5);
+        float opacity = exp(-0.5 * distance * distance / (sigma * sigma))
+            * shadow_values.y * (1.0 - coverage) * alpha;
+        gl_FragColor = vec4(0.0, 0.0, 0.0, opacity);
+    } else {
+        float opacity = tint.a * coverage * alpha;
+        gl_FragColor = vec4(tint.rgb * opacity, opacity);
+    }
+}

compositor/src/render/shaders/rounded_border_shader.frag

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+
+precision highp float;
+
+uniform float alpha;
+uniform vec4 clip_rect;
+uniform float radius;
+uniform float border_width;
+uniform vec4 border_color;
+uniform vec4 border_color_to;
+uniform vec4 gradient_line;
+uniform vec4 focus_color;
+uniform vec4 focus_color_to;
+uniform vec4 focus_gradient_line;
+uniform float focus_mix;
+varying vec2 v_coords;
+
+#if defined(DEBUG_FLAGS)
+uniform float tint;
+#endif
+
+void main() {
+    vec2 point = gl_FragCoord.xy - clip_rect.xy;
+    vec2 half_size = clip_rect.zw * 0.5;
+    vec2 distance = abs(point - half_size) - (half_size - vec2(radius));
+    float signed_distance = length(max(distance, 0.0))
+        + min(max(distance.x, distance.y), 0.0)
+        - radius;
+    float outer_coverage = 1.0 - smoothstep(-0.5, 0.5, signed_distance);
+
+    vec2 inner_half_size = max(half_size - vec2(border_width), vec2(0.0));
+    float inner_radius = max(radius - border_width, 0.0);
+    vec2 inner_distance = abs(point - half_size)
+        - (inner_half_size - vec2(inner_radius));
+    float inner_signed_distance = length(max(inner_distance, 0.0))
+        + min(max(inner_distance.x, inner_distance.y), 0.0)
+        - inner_radius;
+    float inner_coverage = 1.0 - smoothstep(-0.5, 0.5, inner_signed_distance);
+    float coverage = max(outer_coverage - inner_coverage, 0.0);
+    float progress = clamp(dot(gl_FragCoord.xy - gradient_line.xy, gradient_line.zw), 0.0, 1.0);
+    // Interpolate premultiplied endpoints: a transparent endpoint must not
+    // leak its RGB into the visible border or create a dark halo.
+    vec4 from = vec4(border_color.rgb * border_color.a, border_color.a);
+    vec4 to = vec4(border_color_to.rgb * border_color_to.a, border_color_to.a);
+    float focus_progress = clamp(dot(gl_FragCoord.xy - focus_gradient_line.xy, focus_gradient_line.zw), 0.0, 1.0);
+    vec4 focus_from = vec4(focus_color.rgb * focus_color.a, focus_color.a);
+    vec4 focus_to = vec4(focus_color_to.rgb * focus_color_to.a, focus_color_to.a);
+    vec4 color = mix(mix(from, to, progress), mix(focus_from, focus_to, focus_progress), focus_mix) * coverage * alpha;
+
+#if defined(DEBUG_FLAGS)
+    if (tint == 1.0)
+        color = vec4(0.0, 0.2, 0.0, 0.2) + color * 0.8;
+#endif
+
+    gl_FragColor = color;
+}

compositor/src/render/shaders/rounded_texture_shader.frag

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+#version 100
+
+//_DEFINES_
+
+#if defined(EXTERNAL)
+#extension GL_OES_EGL_image_external : require
+#endif
+
+precision highp float;
+#if defined(EXTERNAL)
+uniform samplerExternalOES tex;
+#else
+uniform sampler2D tex;
+#endif
+
+uniform float alpha;
+uniform vec4 clip_rect;
+uniform float radius;
+varying vec2 v_coords;
+
+#if defined(DEBUG_FLAGS)
+uniform float tint;
+#endif
+
+void main() {
+    vec4 color = texture2D(tex, v_coords);
+
+#if defined(NO_ALPHA)
+    color = vec4(color.rgb, 1.0) * alpha;
+#else
+    color = color * alpha;
+#endif
+
+    vec2 point = gl_FragCoord.xy - clip_rect.xy;
+    vec2 half_size = clip_rect.zw * 0.5;
+    vec2 distance = abs(point - half_size) - (half_size - vec2(radius));
+    float signed_distance = length(max(distance, 0.0))
+        + min(max(distance.x, distance.y), 0.0)
+        - radius;
+    float coverage = 1.0 - smoothstep(-0.5, 0.5, signed_distance);
+    color *= coverage;
+
+#if defined(DEBUG_FLAGS)
+    if (tint == 1.0)
+        color = vec4(0.0, 0.2, 0.0, 0.2) + color * 0.8;
+#endif
+
+    gl_FragColor = color;
+}

compositor/src/render/shaders/window_shadow_shader.frag

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+
+precision mediump float;
+
+uniform float alpha;
+uniform vec4 shadow_rect;
+uniform float radius;
+uniform float blur;
+uniform float opacity;
+uniform vec4 shadow_color;
+varying vec2 v_coords;
+
+#if defined(DEBUG_FLAGS)
+uniform float tint;
+#endif
+
+void main() {
+    vec2 point = gl_FragCoord.xy - shadow_rect.xy;
+    vec2 half_size = shadow_rect.zw * 0.5;
+    vec2 distance = abs(point - half_size) - (half_size - vec2(radius));
+    float signed_distance = length(max(distance, 0.0))
+        + min(max(distance.x, distance.y), 0.0)
+        - radius;
+    float sigma = max(blur * 0.5, 0.5);
+    float normalized_distance = max(signed_distance, 0.0) / sigma;
+    float coverage = exp(-0.5 * normalized_distance * normalized_distance);
+    vec4 color = vec4(shadow_color.rgb * shadow_color.a, shadow_color.a)
+        * coverage * opacity * alpha;
+
+#if defined(DEBUG_FLAGS)
+    if (tint == 1.0)
+        color = vec4(0.0, 0.2, 0.0, 0.2) + color * 0.8;
+#endif
+
+    gl_FragColor = color;
+}