Simon Schneegans
71 lines
2.4 KiB
GLSL
71 lines
2.4 KiB
GLSL
// We simply inverse the progress for opening windows.
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float progress = uForOpening ? uProgress : 1.0 - uProgress;
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float gradient = cogl_tex_coord_in[0].t * ACTOR_SCALE - PADDING;
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progress = 2.0 - gradient - 2.0 * progress;
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progress = progress + 0.25 - 0.5 * simplex2D((cogl_tex_coord_in[0].st + uSeed) * 2.0);
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progress = pow(max(0, progress), 2.0);
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// This may help you to understand how this effect works.
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// cogl_color_out = vec4(progress, 0, 0, 0);
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// return;
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cogl_color_out = vec4(0, 0, 0, 0);
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for (float i = 0; i < DUST_LAYERS; ++i) {
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// Create a random direction.
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float factor = DUST_LAYERS == 1 ? 0 : i / (DUST_LAYERS - 1);
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float angle = 123.123 * (uSeed.x + factor);
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vec2 direction = vec2(1.0, 0.0);
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direction = rotate(direction, angle);
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// Flip direction for one side of the window.
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vec2 coords = cogl_tex_coord_in[0].st * ACTOR_SCALE - PADDING - 0.5;
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if (getWinding(direction, coords) > 0) {
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direction *= -1;
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}
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// Flip direction for half the layers.
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if (factor > 0.5) {
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direction *= -1;
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}
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// We grow the layer along the random direction, shrink it orthogonally to it
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// and scale it up slightly.
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float dist = distToLine(vec2(0.0), direction, coords);
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vec2 grow = direction * dist * mix(0, GROW_INTENSITY, progress);
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vec2 shrink =
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vec2(direction.y, -direction.x) * dist * mix(0, SHRINK_INTENSITY, progress);
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float scale = mix(1.0, 1.05, factor * progress);
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coords = (coords + grow + shrink) / scale;
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// Add some wind.
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coords.x += WIND_INTENSITY * progress * (uForOpening ? 1.0 : -1.0);
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// Now check wether there is actually something in the current dust layer at
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// the coords position.
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vec2 dustCoords = (coords + uSeed) * uSize / uDustScale / 100.0;
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vec2 dustMap = texture2D(uDustTexture, dustCoords).rg;
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float dustGroup = floor(dustMap.g * DUST_LAYERS * 0.999);
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if (dustGroup == i) {
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// Get the window color.
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vec4 windowColor = texture2D(uTexture, coords + 0.5);
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// Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
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if (windowColor.a > 0) {
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windowColor.rgb /= windowColor.a;
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}
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// Fade the window color to uDustColor.
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vec3 dustColor = mix(windowColor.rgb, uDustColor.rgb, uDustColor.a);
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windowColor.rgb = mix(windowColor.rgb, dustColor, progress);
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// Dissolve and blend the layers.
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if (dustMap.x - progress > 0) {
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cogl_color_out = windowColor;
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}
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}
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} |