Simon Schneegans
56 lines
2.0 KiB
GLSL
56 lines
2.0 KiB
GLSL
// Inject some common shader snippets. It is only possible to include glsl files from the
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// "common" directory. Also, the files in the "common" directory are not allowed to
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// include any further files.
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#include "common/uniforms.glsl"
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#include "common/noise.glsl"
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#include "common/edgeMask.glsl"
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#include "common/compositing.glsl"
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uniform vec2 uSeed;
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uniform vec3 uColor;
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uniform float uScale;
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const float WISPS_RADIUS = 20.0;
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const float WISPS_SPEED = 10.0;
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const float WISPS_SPACING = 40 + WISPS_RADIUS;
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const int WISPS_LAYERS = 8;
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const float WISPS_IN_TIME = 0.5;
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const float WINDOW_OUT_TIME = 1.0;
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// Returns a grid of randomly moving points. Each grid cell contains one point which
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// moves on an ellipse.
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float getWisps(vec2 texCoords, float gridSize, vec2 seed) {
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// Shift coordinates by a random offset and make sure the have a 1:1 aspect ratio.
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vec2 coords = (texCoords + hash22(seed)) * uSize;
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// Apply global scale.
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coords /= gridSize;
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// Get grid cell coordinates in [0..1].
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vec2 cellUV = mod(coords, vec2(1));
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// This is unique for each cell.
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vec2 cellID = coords - cellUV + vec2(362.456);
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// Add random rotation, scale and offset to each grid cell.
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float speed = mix(10.0, 15.0, hash12(cellID * seed * 134.451)) / gridSize * WISPS_SPEED;
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float rotation = mix(0.0, 6.283, hash12(cellID * seed * 54.4129));
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float radius = mix(0.5, 1.0, hash12(cellID * seed * 19.1249)) * WISPS_RADIUS;
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float roundness = mix(-1.0, 1.0, hash12(cellID * seed * 7.51949));
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vec2 offset = vec2(sin(speed * (uTime + 1)) * roundness, cos(speed * (uTime + 1)));
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offset *= 0.5 - 0.5 * radius / gridSize;
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offset = vec2(offset.x * cos(rotation) - offset.y * sin(rotation),
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offset.x * sin(rotation) + offset.y * cos(rotation));
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cellUV += offset;
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// Use distance to center of shifted / rotated UV coordinates to draw a glaring point.
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float dist = length(cellUV - 0.5) * gridSize / radius;
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if (dist < 1.0) {
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return min(5, 0.01 / pow(dist, 2.0));
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}
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return 0.0;
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} |