Simon Schneegans
66 lines
2.2 KiB
GLSL
66 lines
2.2 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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uniform vec3 uColor;
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uniform float uScale;
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const float SHOWER_TIME = 0.3;
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const float SHOWER_WIDTH = 0.3;
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const float STREAK_TIME = 0.6;
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const float EDGE_FADE = 50;
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// This method returns four values:
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// result.x: A mask for the particles which lead the shower.
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// result.y: A mask for the streaks which follow the shower particles.
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// result.z: A mask for the final "atom" particles.
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// result.w: The opacity of the fading window.
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vec4 getMasks() {
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float showerProgress = uProgress / SHOWER_TIME;
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float streakProgress = clamp((uProgress - SHOWER_TIME) / STREAK_TIME, 0, 1);
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float fadeProgress = clamp((uProgress - SHOWER_TIME) / (1.0 - SHOWER_TIME), 0, 1);
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// Gradient from top to bottom.
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float t = cogl_tex_coord_in[0].t;
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// A smooth gradient which moves to the bottom within the showerProgress.
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float showerMask =
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smoothstep(1, 0, abs(showerProgress - t - SHOWER_WIDTH) / SHOWER_WIDTH);
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// This is 1 above the streak mask.
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float streakMask = (showerProgress - t - SHOWER_WIDTH) > 0 ? 1 : 0;
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// Compute mask for the "atom" particles.
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float atomMask = getRelativeEdgeMask(0.2);
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atomMask = max(0, atomMask - showerMask);
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atomMask *= streakMask;
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atomMask *= sqrt(1 - fadeProgress * fadeProgress);
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// Make some particles visible in the streaks.
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showerMask += 0.05 * streakMask;
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// Add shower mask to streak mask.
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streakMask = max(streakMask, showerMask);
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// Fade-out the masks at the window edges.
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float edgeFade = getAbsoluteEdgeMask(EDGE_FADE);
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streakMask *= edgeFade;
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showerMask *= edgeFade;
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// Fade-out the masks from top to bottom.
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float fade = smoothstep(0.0, 1.0, 1.0 + t - 2.0 * streakProgress);
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streakMask *= fade;
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showerMask *= fade;
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// Compute fading window opacity.
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float windowMask = pow(1.0 - fadeProgress, 2.0);
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if (uForOpening) {
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windowMask = 1.0 - windowMask;
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}
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return vec4(showerMask, streakMask, atomMask, windowMask);
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} |