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skia2/tools/viewer/ParticlesSlide.cpp
John Stiles 127d22edc3 Remove starts_with and ends_with from SkSL::String. 
std::string::starts_with will be available in C++20. In the interim,
prefer using a free function in skstd. This puts us a small step closer
towards removing SkSL::String.

Change-Id: I8c6b33d94c51a643d8cb99ac4c4b1c0556cb9170
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/502782
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2022-02-02 14:14:49 +00:00

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/*
* Copyright 2019 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "tools/viewer/ParticlesSlide.h"
#include "include/core/SkCanvas.h"
#include "include/private/SkStringView.h"
#include "modules/particles/include/SkParticleEffect.h"
#include "modules/particles/include/SkParticleSerialization.h"
#include "modules/particles/include/SkReflected.h"
#include "modules/skresources/include/SkResources.h"
#include "src/core/SkOSFile.h"
#include "src/sksl/codegen/SkSLVMCodeGenerator.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) {
if (data->EventFlag == ImGuiInputTextFlags_CallbackResize) {
SkString* s = (SkString*)data->UserData;
SkASSERT(data->Buf == s->writable_str());
SkString tmp(data->Buf, data->BufTextLen);
s->swap(tmp);
data->Buf = s->writable_str();
}
return 0;
}
static int count_lines(const SkString& s) {
int lines = 1;
for (size_t i = 0; i < s.size(); ++i) {
if (s[i] == '\n') {
++lines;
}
}
return lines;
}
class SkGuiVisitor : public SkFieldVisitor {
public:
SkGuiVisitor() {
fTreeStack.push_back(true);
}
void visit(const char* name, float& f) override {
fDirty = (fTreeStack.back() && ImGui::DragFloat(item(name), &f)) || fDirty;
}
void visit(const char* name, int& i) override {
fDirty = (fTreeStack.back() && ImGui::DragInt(item(name), &i)) || fDirty;
}
void visit(const char* name, bool& b) override {
fDirty = (fTreeStack.back() && ImGui::Checkbox(item(name), &b)) || fDirty;
}
void visit(const char* name, SkString& s) override {
if (fTreeStack.back()) {
int lines = count_lines(s);
ImGuiInputTextFlags flags = ImGuiInputTextFlags_CallbackResize;
if (lines > 1) {
ImGui::LabelText("##Label", "%s", name);
ImVec2 boxSize(-1.0f, ImGui::GetTextLineHeight() * (lines + 1));
fDirty = ImGui::InputTextMultiline(item(name), s.writable_str(), s.size() + 1,
boxSize, flags, InputTextCallback, &s)
|| fDirty;
} else {
fDirty = ImGui::InputText(item(name), s.writable_str(), s.size() + 1, flags,
InputTextCallback, &s)
|| fDirty;
}
}
}
void visit(sk_sp<SkReflected>& e, const SkReflected::Type* baseType) override {
if (fTreeStack.back()) {
const SkReflected::Type* curType = e ? e->getType() : nullptr;
if (ImGui::BeginCombo("Type", curType ? curType->fName : "Null")) {
auto visitType = [baseType, curType, &e, this](const SkReflected::Type* t) {
if (t->fFactory && (t == baseType || t->isDerivedFrom(baseType)) &&
ImGui::Selectable(t->fName, curType == t)) {
e = t->fFactory();
fDirty = true;
}
};
SkReflected::VisitTypes(visitType);
ImGui::EndCombo();
}
}
}
void enterObject(const char* name) override {
if (fTreeStack.back()) {
fTreeStack.push_back(ImGui::TreeNodeEx(item(name),
ImGuiTreeNodeFlags_AllowItemOverlap));
} else {
fTreeStack.push_back(false);
}
}
void exitObject() override {
if (fTreeStack.back()) {
ImGui::TreePop();
}
fTreeStack.pop_back();
}
int enterArray(const char* name, int oldCount) override {
this->enterObject(item(name));
fArrayCounterStack.push_back(0);
fArrayEditStack.push_back();
int count = oldCount;
if (fTreeStack.back()) {
ImGui::SameLine();
if (ImGui::Button("+")) {
++count;
fDirty = true;
}
}
return count;
}
ArrayEdit exitArray() override {
fArrayCounterStack.pop_back();
auto edit = fArrayEditStack.back();
fArrayEditStack.pop_back();
this->exitObject();
return edit;
}
bool fDirty = false;
private:
const char* item(const char* name) {
if (name) {
return name;
}
// We're in an array. Add extra controls and a dynamic label.
int index = fArrayCounterStack.back()++;
ArrayEdit& edit(fArrayEditStack.back());
fScratchLabel = SkStringPrintf("[%d]", index);
ImGui::PushID(index);
if (ImGui::Button("X")) {
edit.fVerb = ArrayEdit::Verb::kRemove;
edit.fIndex = index;
fDirty = true;
}
ImGui::SameLine();
ImGui::PopID();
return fScratchLabel.c_str();
}
SkSTArray<16, bool, true> fTreeStack;
SkSTArray<16, int, true> fArrayCounterStack;
SkSTArray<16, ArrayEdit, true> fArrayEditStack;
SkString fScratchLabel;
};
ParticlesSlide::ParticlesSlide() {
// Register types for serialization
SkParticleEffect::RegisterParticleTypes();
fName = "Particles";
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) {
fLoaded.reset();
fRunning.reset();
SkOSFile::Iter iter(dirname, ".json");
for (SkString file; iter.next(&file); ) {
LoadedEffect effect;
effect.fName = SkOSPath::Join(dirname, file.c_str());
effect.fParams.reset(new SkParticleEffectParams());
if (auto fileData = SkData::MakeFromFileName(effect.fName.c_str())) {
skjson::DOM dom(static_cast<const char*>(fileData->data()), fileData->size());
SkFromJsonVisitor fromJson(dom.root());
effect.fParams->visitFields(&fromJson);
effect.fParams->prepare(fResourceProvider.get());
fLoaded.push_back(effect);
}
}
std::sort(fLoaded.begin(), fLoaded.end(), [](const LoadedEffect& a, const LoadedEffect& b) {
return strcmp(a.fName.c_str(), b.fName.c_str()) < 0;
});
}
void ParticlesSlide::load(SkScalar winWidth, SkScalar winHeight) {
this->loadEffects(GetResourcePath("particles").c_str());
}
void ParticlesSlide::draw(SkCanvas* canvas) {
canvas->clear(SK_ColorGRAY);
// Window to show all loaded effects, and allow playing them
if (ImGui::Begin("Library", nullptr, ImGuiWindowFlags_AlwaysVerticalScrollbar)) {
static bool looped = true;
ImGui::Checkbox("Looped", &looped);
static SkString dirname = GetResourcePath("particles");
ImGuiInputTextFlags textFlags = ImGuiInputTextFlags_CallbackResize;
ImGui::InputText("Directory", dirname.writable_str(), dirname.size() + 1, textFlags,
InputTextCallback, &dirname);
if (ImGui::Button("New")) {
LoadedEffect effect;
effect.fName = SkOSPath::Join(dirname.c_str(), "new.json");
effect.fParams.reset(new SkParticleEffectParams());
fLoaded.push_back(effect);
}
ImGui::SameLine();
if (ImGui::Button("Load")) {
this->loadEffects(dirname.c_str());
}
ImGui::SameLine();
if (ImGui::Button("Save")) {
for (const auto& effect : fLoaded) {
SkFILEWStream fileStream(effect.fName.c_str());
if (fileStream.isValid()) {
SkJSONWriter writer(&fileStream, SkJSONWriter::Mode::kPretty);
SkToJsonVisitor toJson(writer);
writer.beginObject();
effect.fParams->visitFields(&toJson);
writer.endObject();
writer.flush();
fileStream.flush();
} else {
SkDebugf("Failed to open %s\n", effect.fName.c_str());
}
}
}
SkGuiVisitor gui;
for (int i = 0; i < fLoaded.count(); ++i) {
ImGui::PushID(i);
if (fAnimated && ImGui::Button("Play")) {
sk_sp<SkParticleEffect> effect(new SkParticleEffect(fLoaded[i].fParams));
effect->start(fAnimationTime, looped, { 0, 0 }, { 0, -1 }, 1, { 0, 0 }, 0,
{ 1, 1, 1, 1 }, 0, fRandom.nextF());
fRunning.push_back({ fLoaded[i].fName, effect, false });
}
ImGui::SameLine();
ImGui::InputText("##Name", fLoaded[i].fName.writable_str(), fLoaded[i].fName.size() + 1,
textFlags, InputTextCallback, &fLoaded[i].fName);
if (ImGui::TreeNode("##Details")) {
fLoaded[i].fParams->visitFields(&gui);
ImGui::TreePop();
if (gui.fDirty) {
fLoaded[i].fParams->prepare(fResourceProvider.get());
gui.fDirty = false;
}
}
ImGui::PopID();
}
}
ImGui::End();
// Most effects are centered around the origin, so we shift the canvas...
constexpr SkVector kTranslation = { 250.0f, 250.0f };
const SkPoint mousePos = fMousePos - kTranslation;
// Another window to show all the running effects
if (ImGui::Begin("Running")) {
for (int i = 0; i < fRunning.count(); ++i) {
SkParticleEffect* effect = fRunning[i].fEffect.get();
ImGui::PushID(effect);
ImGui::Checkbox("##Track", &fRunning[i].fTrackMouse);
ImGui::SameLine();
bool remove = ImGui::Button("X") || !effect->isAlive();
ImGui::SameLine();
ImGui::Text("%5d %s", effect->getCount(), fRunning[i].fName.c_str());
if (fRunning[i].fTrackMouse) {
effect->setPosition(mousePos);
}
auto uniformsGui = [mousePos](const SkSL::UniformInfo* info, float* data) {
if (!info || !data) {
return;
}
for (size_t i = 0; i < info->fUniforms.size(); ++i) {
const auto& uni = info->fUniforms[i];
float* vals = data + uni.fSlot;
// Skip over builtin uniforms, to reduce clutter
if (uni.fName == "dt" || skstd::starts_with(uni.fName, "effect.")) {
continue;
}
// Special case for 'uniform float2 mouse_pos' - an example of likely app logic
if (uni.fName == "mouse_pos" &&
uni.fKind == SkSL::Type::NumberKind::kFloat &&
uni.fRows == 2 && uni.fColumns == 1) {
vals[0] = mousePos.fX;
vals[1] = mousePos.fY;
continue;
}
if (uni.fKind == SkSL::Type::NumberKind::kBoolean) {
for (int c = 0; c < uni.fColumns; ++c, vals += uni.fRows) {
for (int r = 0; r < uni.fRows; ++r, ++vals) {
ImGui::PushID(c*uni.fRows + r);
if (r > 0) {
ImGui::SameLine();
}
ImGui::CheckboxFlags(r == uni.fRows - 1 ? uni.fName.c_str()
: "##Hidden",
(unsigned int*)vals, ~0);
ImGui::PopID();
}
}
continue;
}
ImGuiDataType dataType = ImGuiDataType_COUNT;
using NumberKind = SkSL::Type::NumberKind;
switch (uni.fKind) {
case NumberKind::kSigned: dataType = ImGuiDataType_S32; break;
case NumberKind::kUnsigned: dataType = ImGuiDataType_U32; break;
case NumberKind::kFloat: dataType = ImGuiDataType_Float; break;
default: break;
}
SkASSERT(dataType != ImGuiDataType_COUNT);
for (int c = 0; c < uni.fColumns; ++c, vals += uni.fRows) {
ImGui::PushID(c);
ImGui::DragScalarN(uni.fName.c_str(), dataType, vals, uni.fRows, 1.0f);
ImGui::PopID();
}
}
};
uniformsGui(effect->uniformInfo(), effect->uniformData());
if (remove) {
fRunning.removeShuffle(i);
}
ImGui::PopID();
}
}
ImGui::End();
canvas->save();
canvas->translate(kTranslation.fX, kTranslation.fY);
for (const auto& effect : fRunning) {
effect.fEffect->draw(canvas);
}
canvas->restore();
}
bool ParticlesSlide::animate(double nanos) {
fAnimated = true;
fAnimationTime = 1e-9 * nanos;
for (const auto& effect : fRunning) {
effect.fEffect->update(fAnimationTime);
}
return true;
}
bool ParticlesSlide::onMouse(SkScalar x, SkScalar y, skui::InputState state, skui::ModifierKey modifiers) {
fMousePos.set(x, y);
return false;
}
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