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283 lines
9.7 KiB
283 lines
9.7 KiB
/*
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* Copyright 2019 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "tools/viewer/SkSLSlide.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkFont.h"
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#include "include/effects/SkGradientShader.h"
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#include "include/effects/SkPerlinNoiseShader.h"
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#include "src/core/SkEnumerate.h"
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#include "tools/Resources.h"
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#include "tools/viewer/Viewer.h"
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#include <algorithm>
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#include <cstdio>
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#include "imgui.h"
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using namespace sk_app;
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///////////////////////////////////////////////////////////////////////////////
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static int InputTextCallback(ImGuiInputTextCallbackData* data) {
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if (data->EventFlag == ImGuiInputTextFlags_CallbackResize) {
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SkString* s = (SkString*)data->UserData;
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SkASSERT(data->Buf == s->writable_str());
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SkString tmp(data->Buf, data->BufTextLen);
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s->swap(tmp);
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data->Buf = s->writable_str();
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}
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return 0;
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}
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SkSLSlide::SkSLSlide() {
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// Register types for serialization
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fName = "SkSL";
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fSkSL =
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"uniform shader child;\n"
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"\n"
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"half4 main(float2 p) {\n"
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" return sample(child, p);\n"
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"}\n";
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fCodeIsDirty = true;
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}
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void SkSLSlide::load(SkScalar winWidth, SkScalar winHeight) {
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SkPoint points[] = { { 0, 0 }, { 256, 0 } };
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SkColor colors[] = { SK_ColorRED, SK_ColorGREEN };
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sk_sp<SkShader> shader;
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fShaders.push_back(std::make_pair("Null", nullptr));
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shader = SkGradientShader::MakeLinear(points, colors, nullptr, 2, SkTileMode::kClamp);
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fShaders.push_back(std::make_pair("Linear Gradient", shader));
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shader = SkGradientShader::MakeRadial({ 256, 256 }, 256, colors, nullptr, 2,
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SkTileMode::kClamp);
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fShaders.push_back(std::make_pair("Radial Gradient", shader));
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shader = SkGradientShader::MakeSweep(256, 256, colors, nullptr, 2);
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fShaders.push_back(std::make_pair("Sweep Gradient", shader));
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shader = GetResourceAsImage("images/mandrill_256.png")->makeShader(SkSamplingOptions());
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fShaders.push_back(std::make_pair("Mandrill", shader));
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fResolution = { winWidth, winHeight, 1.0f };
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}
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void SkSLSlide::unload() {
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fEffect.reset();
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fInputs.reset();
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fChildren.reset();
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fShaders.reset();
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}
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bool SkSLSlide::rebuild() {
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// Some of the standard shadertoy inputs:
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SkString sksl("uniform float3 iResolution;\n"
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"uniform float iTime;\n"
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"uniform float4 iMouse;\n");
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sksl.append(fSkSL);
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// It shouldn't happen, but it's possible to assert in the compiler, especially mid-edit.
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// To guard against losing your work, write out the shader to a backup file, then remove it
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// when we compile successfully.
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constexpr char kBackupFile[] = "sksl.bak";
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FILE* backup = fopen(kBackupFile, "w");
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if (backup) {
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fwrite(fSkSL.c_str(), 1, fSkSL.size(), backup);
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fclose(backup);
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}
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auto [effect, errorText] = SkRuntimeEffect::MakeForShader(sksl);
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if (backup) {
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std::remove(kBackupFile);
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}
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if (!effect) {
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Viewer::ShaderErrorHandler()->compileError(sksl.c_str(), errorText.c_str());
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return false;
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}
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size_t oldSize = fEffect ? fEffect->uniformSize() : 0;
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fInputs.realloc(effect->uniformSize());
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if (effect->uniformSize() > oldSize) {
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memset(fInputs.get() + oldSize, 0, effect->uniformSize() - oldSize);
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}
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fChildren.resize_back(effect->children().count());
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fEffect = effect;
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fCodeIsDirty = false;
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return true;
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}
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void SkSLSlide::draw(SkCanvas* canvas) {
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canvas->clear(SK_ColorWHITE);
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ImGui::Begin("SkSL", nullptr, ImGuiWindowFlags_AlwaysVerticalScrollbar);
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// Edit box for shader code
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ImGuiInputTextFlags flags = ImGuiInputTextFlags_CallbackResize;
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ImVec2 boxSize(-1.0f, ImGui::GetTextLineHeight() * 30);
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if (ImGui::InputTextMultiline("Code", fSkSL.writable_str(), fSkSL.size() + 1, boxSize, flags,
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InputTextCallback, &fSkSL)) {
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fCodeIsDirty = true;
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}
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if (fCodeIsDirty || !fEffect) {
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this->rebuild();
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}
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if (!fEffect) {
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ImGui::End();
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return;
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}
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// Update fMousePos
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ImVec2 mousePos = ImGui::GetMousePos();
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if (ImGui::IsMouseDown(0)) {
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fMousePos.x = mousePos.x;
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fMousePos.y = mousePos.y;
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}
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if (ImGui::IsMouseClicked(0)) {
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fMousePos.z = mousePos.x;
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fMousePos.w = mousePos.y;
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}
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fMousePos.z = abs(fMousePos.z) * (ImGui::IsMouseDown(0) ? 1 : -1);
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fMousePos.w = abs(fMousePos.w) * (ImGui::IsMouseClicked(0) ? 1 : -1);
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for (const auto& v : fEffect->uniforms()) {
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char* data = fInputs.get() + v.offset;
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if (v.name.equals("iResolution")) {
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memcpy(data, &fResolution, sizeof(fResolution));
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continue;
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}
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if (v.name.equals("iTime")) {
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memcpy(data, &fSeconds, sizeof(fSeconds));
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continue;
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}
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if (v.name.equals("iMouse")) {
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memcpy(data, &fMousePos, sizeof(fMousePos));
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continue;
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}
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switch (v.type) {
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case SkRuntimeEffect::Uniform::Type::kFloat:
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case SkRuntimeEffect::Uniform::Type::kFloat2:
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case SkRuntimeEffect::Uniform::Type::kFloat3:
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case SkRuntimeEffect::Uniform::Type::kFloat4: {
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int rows = ((int)v.type - (int)SkRuntimeEffect::Uniform::Type::kFloat) + 1;
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float* f = reinterpret_cast<float*>(data);
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for (int c = 0; c < v.count; ++c, f += rows) {
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SkString name = v.isArray() ? SkStringPrintf("%s[%d]", v.name.c_str(), c)
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: v.name;
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ImGui::PushID(c);
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ImGui::DragScalarN(name.c_str(), ImGuiDataType_Float, f, rows, 1.0f);
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ImGui::PopID();
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}
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break;
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}
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case SkRuntimeEffect::Uniform::Type::kFloat2x2:
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case SkRuntimeEffect::Uniform::Type::kFloat3x3:
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case SkRuntimeEffect::Uniform::Type::kFloat4x4: {
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int rows = ((int)v.type - (int)SkRuntimeEffect::Uniform::Type::kFloat2x2) + 2;
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int cols = rows;
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float* f = reinterpret_cast<float*>(data);
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for (int e = 0; e < v.count; ++e) {
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for (int c = 0; c < cols; ++c, f += rows) {
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SkString name = v.isArray()
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? SkStringPrintf("%s[%d][%d]", v.name.c_str(), e, c)
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: SkStringPrintf("%s[%d]", v.name.c_str(), c);
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ImGui::DragScalarN(name.c_str(), ImGuiDataType_Float, f, rows, 1.0f);
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}
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}
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break;
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}
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case SkRuntimeEffect::Uniform::Type::kInt:
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case SkRuntimeEffect::Uniform::Type::kInt2:
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case SkRuntimeEffect::Uniform::Type::kInt3:
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case SkRuntimeEffect::Uniform::Type::kInt4: {
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int rows = ((int)v.type - (int)SkRuntimeEffect::Uniform::Type::kInt) + 1;
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int* i = reinterpret_cast<int*>(data);
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for (int c = 0; c < v.count; ++c, i += rows) {
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SkString name = v.isArray() ? SkStringPrintf("%s[%d]", v.name.c_str(), c)
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: v.name;
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ImGui::PushID(c);
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ImGui::DragScalarN(name.c_str(), ImGuiDataType_S32, i, rows, 1.0f);
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ImGui::PopID();
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}
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break;
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}
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}
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}
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for (const auto& c : fEffect->children()) {
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auto curShader =
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std::find_if(fShaders.begin(), fShaders.end(), [tgt = fChildren[c.index]](auto p) {
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return p.second == tgt;
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});
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SkASSERT(curShader != fShaders.end());
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if (ImGui::BeginCombo(c.name.c_str(), curShader->first)) {
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for (const auto& namedShader : fShaders) {
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if (ImGui::Selectable(namedShader.first, curShader->second == namedShader.second)) {
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fChildren[c.index] = namedShader.second;
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}
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}
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ImGui::EndCombo();
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}
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}
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static SkColor4f gPaintColor { 1.0f, 1.0f, 1.0f , 1.0f };
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ImGui::ColorEdit4("Paint Color", gPaintColor.vec());
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ImGui::RadioButton("Fill", &fGeometry, kFill); ImGui::SameLine();
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ImGui::RadioButton("Circle", &fGeometry, kCircle); ImGui::SameLine();
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ImGui::RadioButton("RoundRect", &fGeometry, kRoundRect); ImGui::SameLine();
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ImGui::RadioButton("Capsule", &fGeometry, kCapsule); ImGui::SameLine();
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ImGui::RadioButton("Text", &fGeometry, kText);
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ImGui::End();
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auto inputs = SkData::MakeWithoutCopy(fInputs.get(), fEffect->uniformSize());
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auto shader = fEffect->makeShader(std::move(inputs), fChildren.data(), fChildren.count(),
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nullptr, false);
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SkPaint p;
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p.setColor4f(gPaintColor);
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p.setShader(std::move(shader));
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switch (fGeometry) {
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case kFill:
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canvas->drawPaint(p);
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break;
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case kCircle:
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canvas->drawCircle({ 256, 256 }, 256, p);
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break;
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case kRoundRect:
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canvas->drawRoundRect({ 0, 0, 512, 512 }, 64, 64, p);
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break;
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case kCapsule:
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canvas->drawRoundRect({ 0, 224, 512, 288 }, 32, 32, p);
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break;
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case kText: {
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SkFont font;
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font.setSize(SkIntToScalar(96));
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canvas->drawSimpleText("Hello World", strlen("Hello World"), SkTextEncoding::kUTF8, 0,
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256, font, p);
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} break;
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default: break;
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}
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}
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bool SkSLSlide::animate(double nanos) {
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fSeconds = static_cast<float>(nanos * 1E-9);
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return true;
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}
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