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Add initial OpenGL support for Windows, macOS, and Linux
* We've added a new "shader" example to show the capabilities of SkSL shading language (it works on CPU without acceleration, and with GPU shaders). More info: https://skia.org/docs/user/sksl/ * The macOS port still need some work as live resizing is not working/refreshing the window properly. * The API needs some refactor to support different GPU backends (Raster, OpenGL, Direct3D, Metal, etc.) * We still need a way to specify the GPU acceleration by window (instead of system-wide) and when we change the option the window/OpenGL context should be updated/created/destroyed immediately (right now a resize events must be generated to update the backend). Related to: aseprite/aseprite#960 #11
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| Original file line number | Diff line number | Diff line change |
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| // LAF Library | ||
| // Copyright (C) 2022 Igara Studio S.A. | ||
| // | ||
| // This file is released under the terms of the MIT license. | ||
| // Read LICENSE.txt for more information. | ||
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| #include "os/os.h" | ||
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| #ifndef LAF_SKIA | ||
| #error You need Skia library to compile this example | ||
| #endif | ||
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| #if !SK_SUPPORT_GPU | ||
| #error You need Skia with GPU support to compile this example | ||
| #endif | ||
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| #include "base/time.h" | ||
| #include "os/skia/skia_surface.h" | ||
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| #include "include/effects/SkRuntimeEffect.h" | ||
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| #include <cstdio> | ||
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| base::tick_t startTick; | ||
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| // Shader from: | ||
| // https://shaders.skia.org/ | ||
| // https://twitter.com/notargs/status/1250468645030858753 | ||
| const char* shaderCode = R"( | ||
| uniform float3 iResolution; | ||
| uniform float iTime; | ||
| float f(vec3 p) { | ||
| p.z -= iTime * 10.0; | ||
| float a = p.z * .1; | ||
| p.xy *= mat2(cos(a), sin(a), -sin(a), cos(a)); | ||
| return .1 - length(cos(p.xy) + sin(p.yz)); | ||
| } | ||
| half4 main(vec2 fragcoord) { | ||
| vec3 d = .5 - fragcoord.xy1 / iResolution.y; | ||
| vec3 p = vec3(0); | ||
| for (int i = 0; i < 32; i++) { | ||
| p += f(p) * d; | ||
| } | ||
| return ((sin(p) + vec3(2, 5, 9)) / length(p)).xyz1; | ||
| } | ||
| )"; | ||
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| class ShaderWindow { | ||
| public: | ||
| ShaderWindow(os::System* system) | ||
| : m_builder(SkRuntimeEffect::MakeForShader(SkString(shaderCode)).effect) { | ||
| m_window = system->makeWindow(256, 256); | ||
| m_window->setCursor(os::NativeCursor::Arrow); | ||
| m_window->setTitle("Shader"); | ||
| repaint(); | ||
| m_window->setVisible(true); | ||
| } | ||
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| bool processEvent(const os::Event& ev) { | ||
| switch (ev.type()) { | ||
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| case os::Event::CloseWindow: | ||
| return false; | ||
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| case os::Event::ResizeWindow: | ||
| repaint(); | ||
| break; | ||
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| case os::Event::KeyDown: | ||
| if (ev.scancode() == os::kKeyEsc) | ||
| return false; | ||
| else if (ev.scancode() == os::kKeyG) { | ||
| os::instance()->setGpuAcceleration( | ||
| !os::instance()->gpuAcceleration()); | ||
| } | ||
| break; | ||
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| default: | ||
| // Do nothing | ||
| break; | ||
| } | ||
| return true; | ||
| } | ||
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| void repaint() { | ||
| os::Surface* surface = m_window->surface(); | ||
| os::SurfaceLock lock(surface); | ||
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| SkCanvas* canvas = &static_cast<os::SkiaSurface*>(surface)->canvas(); | ||
| skiaPaint(canvas); | ||
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| if (m_window->isGpuAccelerated()) { | ||
| os::Paint p; | ||
| p.color(gfx::rgba(0, 0, 0)); | ||
| os::draw_text(surface, nullptr, "GPU", gfx::Point(12, 12), | ||
| &p, os::TextAlign::Center); | ||
| } | ||
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| m_window->invalidate(); | ||
| m_window->swapBuffers(); | ||
| } | ||
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| private: | ||
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| void skiaPaint(SkCanvas* canvas) { | ||
| SkImageInfo ii = canvas->imageInfo(); | ||
| m_builder.uniform("iResolution") = SkV3{float(ii.width()), | ||
| float(ii.height()), 0.0f}; | ||
| m_builder.uniform("iTime") = | ||
| float((base::current_tick() - startTick) / 1000.0f); | ||
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| SkPaint p; | ||
| p.setShader(m_builder.makeShader()); | ||
| canvas->drawPaint(p); | ||
| } | ||
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| os::WindowRef m_window; | ||
| SkRuntimeShaderBuilder m_builder; | ||
| }; | ||
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| int app_main(int argc, char* argv[]) | ||
| { | ||
| os::SystemRef system = os::make_system(); | ||
| system->setAppMode(os::AppMode::GUI); | ||
| system->setGpuAcceleration(true); | ||
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| ShaderWindow window(system.get()); | ||
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| system->handleWindowResize = [&window](os::Window* win){ | ||
| window.repaint(); | ||
| }; | ||
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| system->finishLaunching(); | ||
| system->activateApp(); | ||
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| startTick = base::current_tick(); | ||
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| os::EventQueue* queue = system->eventQueue(); | ||
| auto t = startTick; | ||
| double paintDelay = 0.0; | ||
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| while (true) { | ||
| os::Event ev; | ||
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| ASSERT(paintDelay >= 0.0); | ||
| const double waitSecs = | ||
| (base::current_tick() - t) / 1000.0 * 60.0 + paintDelay; | ||
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| queue->getEvent(ev, waitSecs); | ||
| if (!window.processEvent(ev)) | ||
| break; | ||
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| auto now = base::current_tick(); | ||
| paintDelay -= (now - t) / 1000.0; | ||
| if (paintDelay < 0.0) { | ||
| auto paintStart = now; | ||
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| window.repaint(); | ||
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| now = base::current_tick(); | ||
| paintDelay = (now - paintStart) / 1000.0; | ||
| } | ||
| t = now; | ||
| } | ||
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| return 0; | ||
| } |
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