Simon Schneegans
49 lines
1.6 KiB
GLSL
49 lines
1.6 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 FADE_IN_TIME = 0.3;
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const float FADE_OUT_TIME = 0.6;
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const float HEART_FADE_TIME = 0.3;
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const float EDGE_FADE_WIDTH = 50;
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// This method returns two values:
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// result.x: A mask for the particles.
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// result.y: The opacity of the fading window.
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vec2 getMasks() {
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float fadeInProgress = clamp(uProgress / FADE_IN_TIME, 0, 1);
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float fadeOutProgress = clamp((uProgress - FADE_IN_TIME) / FADE_OUT_TIME, 0, 1);
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float heartProgress =
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clamp((uProgress - (1.0 - HEART_FADE_TIME)) / HEART_FADE_TIME, 0, 1);
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// Compute mask for the "atom" particles.
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float dist = length(cogl_tex_coord_in[0].st - 0.5) * 4.0;
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float atomMask = smoothstep(0.0, 1.0, (fadeInProgress * 2.0 - dist + 1.0));
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atomMask *= fadeInProgress;
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atomMask *= smoothstep(1.0, 0.0, fadeOutProgress);
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// Fade-out the masks at the window edges.
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float edgeFade = getAbsoluteEdgeMask(EDGE_FADE_WIDTH);
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atomMask *= edgeFade;
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float heartMask = getRelativeEdgeMask(0.5);
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heartMask = 3.0 * pow(heartMask, 5);
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heartMask *= fadeOutProgress;
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heartMask *= 1.0 - heartProgress;
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atomMask = clamp(heartMask + atomMask, 0, 1);
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// Compute fading window opacity.
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float windowMask = pow(1.0 - fadeOutProgress, 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 vec2(atomMask, windowMask);
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} |