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skia2/resources/particles/variable_rate.json

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Particle effect scripting update This change adds another layer of complexity and control to the particle system. There are now two code chunks: the old code that's run per-particle, and new code that's run for the effect itself. This allows for effect lifetime to be set by the script (eg, randomly), as well as the emission rate. Rate can vary over time (see pulse.json), and particles can be emitted in bursts by setting the effect's burst field (see fireworks.json). Additionally, the effect has its own frame of reference and color, which becomes the default state for newly emitted particles. This allows synchronizing state across particles in various interesting ways (see color in fireworks.json). Change-Id: Iec2f7a3427ce1d6411ed7ef5b3023cbef2e8a134 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240498 Reviewed-by: Brian Osman <brianosman@google.com> Reviewed-by: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2019-09-12 20:25:52 +00:00
{
"MaxCount": 4000,
"Drawable": {
"Type": "SkCircleDrawable",
"Radius": 3
},
Update all example particle data to new single-code-chunk format Change-Id: Ic53dc7ecab1b44761fe06e6b528864d24cc5fa58 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/363940 Reviewed-by: Brian Osman <brianosman@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2021-02-01 19:47:30 +00:00
"Code": [
Particle effect scripting update This change adds another layer of complexity and control to the particle system. There are now two code chunks: the old code that's run per-particle, and new code that's run for the effect itself. This allows for effect lifetime to be set by the script (eg, randomly), as well as the emission rate. Rate can vary over time (see pulse.json), and particles can be emitted in bursts by setting the effect's burst field (see fireworks.json). Additionally, the effect has its own frame of reference and color, which becomes the default state for newly emitted particles. This allows synchronizing state across particles in various interesting ways (see color in fireworks.json). Change-Id: Iec2f7a3427ce1d6411ed7ef5b3023cbef2e8a134 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240498 Reviewed-by: Brian Osman <brianosman@google.com> Reviewed-by: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2019-09-12 20:25:52 +00:00
"void effectUpdate(inout Effect effect) {",
" effect.rate = (sin(radians(effect.age * 720)) + 0.7) * 200;",
"}",
Update all example particle data to new single-code-chunk format Change-Id: Ic53dc7ecab1b44761fe06e6b528864d24cc5fa58 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/363940 Reviewed-by: Brian Osman <brianosman@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2021-02-01 19:47:30 +00:00
"",
Particle effect scripting update This change adds another layer of complexity and control to the particle system. There are now two code chunks: the old code that's run per-particle, and new code that's run for the effect itself. This allows for effect lifetime to be set by the script (eg, randomly), as well as the emission rate. Rate can vary over time (see pulse.json), and particles can be emitted in bursts by setting the effect's burst field (see fireworks.json). Additionally, the effect has its own frame of reference and color, which becomes the default state for newly emitted particles. This allows synchronizing state across particles in various interesting ways (see color in fireworks.json). Change-Id: Iec2f7a3427ce1d6411ed7ef5b3023cbef2e8a134 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240498 Reviewed-by: Brian Osman <brianosman@google.com> Reviewed-by: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2019-09-12 20:25:52 +00:00
"void spawn(inout Particle p) {",
" p.lifetime = 6;",
Pure SkSL RNG for particles Change-Id: I2cb6255a553852a292427d6dc9ef8c5ed7f8286d Reviewed-on: https://skia-review.googlesource.com/c/skia/+/252926 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Michael Ludwig <michaelludwig@google.com> Reviewed-by: Mike Reed <reed@google.com>
2020-02-10 18:45:22 +00:00
" float a = radians(rand(p.seed) * 360);",
Add accessors to get/set SkParticleEffect fields Simplify burst handling. Scripts should just add to burst (if they want to handle programmatic bursting, as well). Update most effects to handle dynamic updates to position better, and add a sample effect meant to be used with mouse tracking. Change-Id: Ia302e1d04e62e2b07974807c44067786cc10a8ad Bug: skia:9513 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248798 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Brian Osman <brianosman@google.com>
2019-10-15 14:27:59 +00:00
" float2 ofs = float2(cos(a), sin(a)) * 40;",
" p.pos += ofs;",
" p.vel = ofs;",
Particle effect scripting update This change adds another layer of complexity and control to the particle system. There are now two code chunks: the old code that's run per-particle, and new code that's run for the effect itself. This allows for effect lifetime to be set by the script (eg, randomly), as well as the emission rate. Rate can vary over time (see pulse.json), and particles can be emitted in bursts by setting the effect's burst field (see fireworks.json). Additionally, the effect has its own frame of reference and color, which becomes the default state for newly emitted particles. This allows synchronizing state across particles in various interesting ways (see color in fireworks.json). Change-Id: Iec2f7a3427ce1d6411ed7ef5b3023cbef2e8a134 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240498 Reviewed-by: Brian Osman <brianosman@google.com> Reviewed-by: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
2019-09-12 20:25:52 +00:00
" p.scale = 0.5;",
"}",
""
],
"Bindings": []
}
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