9a8b846baf
* Added a new binding type, SkEffectBinding. This stores another entire effect params structure (so the JSON is just nested). The name is a callable value that spawns a new instance of that effect, inheriting the parameters of the spawning effect or particle (depending on which kind of script made the call). * Broke up the monolithic update function into some helpers, got some code reuse with the script calling logic. * Unlike particle capacity, there is no upper limit on child effects (yet), so it's easy to trigger runaway memory and CPU consumption. Be careful. * Added death scripts to effects and particles, which are a common place to want to spawn sub-effects. Like spawn, these run on each loop, but for one-shots they play at the end. Even with loops, this is helpful for timing sub-effects (see fireworks2.json). * Finally, added a much more comprehensive example effect, raincloud.json. This includes a total of three effects, to generate a cloud, raindrops, and splashes when those drops hit "the ground". Change-Id: I3d7b72bcbb684642cd9723518b67ab1c7d7a538a Reviewed-on: https://skia-review.googlesource.com/c/skia/+/242479 Reviewed-by: Michael Ludwig <michaelludwig@google.com> Commit-Queue: Brian Osman <brianosman@google.com>
80 lines
2.1 KiB
JSON
80 lines
2.1 KiB
JSON
{
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"MaxCount": 1000,
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"Drawable": {
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"Type": "SkCircleDrawable",
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"Radius": 1
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},
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"EffectCode": [
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"void effectSpawn(inout Effect effect) {",
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" effect.lifetime = 2;",
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" effect.rate = 120;",
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" float a = radians(mix(-20, 20, rand) - 90);",
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" float s = mix(200, 220, rand);",
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" effect.vel.x = cos(a) * s;",
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" effect.vel.y = sin(a) * s;",
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" effect.color.rgb = float3(rand, rand, rand);",
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" effect.pos.x = 0;",
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" effect.pos.y = 0;",
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"}",
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"",
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"void effectUpdate(inout Effect effect) {",
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" effect.vel.y += dt * 90;",
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"}",
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"",
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"void effectDeath(inout Effect effect) {",
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" explode(false);",
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"}",
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""
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],
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"Code": [
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"void spawn(inout Particle p) {",
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" p.lifetime = 0.5;",
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" float a = radians(rand * 360);",
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" float s = mix(5, 10, rand);",
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" p.vel.x = cos(a) * s;",
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" p.vel.y = sin(a) * s;",
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"}",
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"",
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"void update(inout Particle p) {",
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" p.color.a = 1 - p.age;",
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"}",
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""
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],
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"Bindings": [
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{
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"Type": "SkEffectBinding",
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"Name": "explode",
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"MaxCount": 50,
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"Drawable": {
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"Type": "SkCircleDrawable",
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"Radius": 3
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},
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"EffectCode": [
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"void effectSpawn(inout Effect effect) {",
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" effect.burst = 50;",
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" effect.lifetime = 2.5;",
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"}",
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"",
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"void effectUpdate(inout Effect effect) {",
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"}",
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""
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],
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"Code": [
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"void spawn(inout Particle p) {",
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" p.lifetime = 2 + rand * 0.5;",
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" float a = radians(rand * 360);",
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" float s = mix(90, 100, rand);",
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" p.vel.x = cos(a) * s;",
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" p.vel.y = sin(a) * s;",
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"}",
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"",
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"void update(inout Particle p) {",
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" p.color.a = 1 - p.age;",
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" p.vel.y += dt * 50;",
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"}",
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""
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],
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"Bindings": []
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}
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]
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} |