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Tweak ParticlesSlide's resource provider to show how to use PathBinding

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Adds an example effect that spawns particles along an SkPath.

Change-Id: I53f3c02fefec814bd9e16f3ac593eac4cf6a297c
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/341418
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
This commit is contained in:
Brian Osman 2020-12-07 10:07:27 -05:00 committed by Skia Commit-Bot
parent b21fac2481
commit e7f68f3644
2 changed files with 72 additions and 1 deletions
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35
resources/particles/path_spawn.json Normal file
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@ -0,0 +1,35 @@
{
"MaxCount": 800,
"Drawable": {
"Type": "SkCircleDrawable",
"Radius": 2
},
"EffectCode": [
"void effectSpawn(inout Effect effect) {",
" effect.lifetime = 1;",
" effect.rate = 100;",
"}",
""
],
"Code": [
"void spawn(inout Particle p) {",
" float4 pos_and_normal = my_path(rand(p.seed));",
" p.pos = pos_and_normal.xy;",
" p.vel = pos_and_normal.zw * -5;",
"",
" p.lifetime = 2;",
"}",
"",
"void update(inout Particle p) {",
"}",
""
],
"Bindings": [
{
"Type": "SkPathBinding",
"Name": "my_path",
"PathPath": "",
"PathName": "star"
}
]
}

38
tools/viewer/ParticlesSlide.cpp
View File

@ -16,12 +16,44 @@
#include "src/sksl/SkSLByteCode.h"
#include "src/utils/SkOSPath.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include "tools/viewer/ImGuiLayer.h"
#include "imgui.h"
#include <string>
#include <unordered_map>
using namespace sk_app;
class TestingResourceProvider : public skresources::ResourceProvider {
public:
TestingResourceProvider() {}
sk_sp<SkData> load(const char resource_path[], const char resource_name[]) const override {
auto it = fResources.find(resource_name);
if (it != fResources.end()) {
return it->second;
} else {
return GetResourceAsData(SkOSPath::Join(resource_path, resource_name).c_str());
}
}
sk_sp<skresources::ImageAsset> loadImageAsset(const char resource_path[],
const char resource_name[],
const char /*resource_id*/[]) const override {
auto data = this->load(resource_path, resource_name);
return skresources::MultiFrameImageAsset::Make(data);
}
void addPath(const char resource_name[], const SkPath& path) {
fResources[resource_name] = path.serialize();
}
private:
std::unordered_map<std::string, sk_sp<SkData>> fResources;
};
///////////////////////////////////////////////////////////////////////////////
static int InputTextCallback(ImGuiInputTextCallbackData* data) {
@ -171,7 +203,11 @@ ParticlesSlide::ParticlesSlide() {
// Register types for serialization
SkParticleEffect::RegisterParticleTypes();
fName = "Particles";
fResourceProvider = skresources::FileResourceProvider::Make(GetResourcePath());
auto provider = sk_make_sp<TestingResourceProvider>();
SkPath star = ToolUtils::make_star({ 0, 0, 100, 100 }, 5);
star.close();
provider->addPath("star", star);
fResourceProvider = provider;
}
void ParticlesSlide::loadEffects(const char* dirname) {