Gl_ansio [work] -

Based on the potential of the GL-ANSIO technique, we recommend:

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| Goal | How it works | |------|--------------| | | Reads image files on a worker thread, decodes them with stb_image , then hands the raw pixel data over to the GL thread for the actual glTexImage2D call. | | Thread‑safe GL context | The OpenGL context is made current only on the rendering thread. The worker thread never touches any GL calls. | | Future‑based API | glAnsio::loadTextureAsync(path) returns a std::future<GLuint> that resolves to the newly created texture handle when the GPU upload is finished. | | Optional coroutine interface | If you compile with GL_ANSIO_USE_COROUTINES , you get an co_await ‑able TextureFuture . | | Extensible to other resource types | The core AsyncResource<T> template can be reused for buffers, shaders, etc. |

| Step | Command / Action | |------|------------------| | | Copy gl_ansio.hpp , gl_ansio.cpp , and stb_image.h into your source tree. | | 2️⃣ Link dependencies | - GLFW (window & context) - GLAD or any GL loader - C++20 standard library (≥ gcc 10/clang 12/MSVC 2019) | | 3️⃣ Compile | bash<br>g++ -std=c++20 -O2 -Ipath/to/include gl_ansio.cpp your_app.cpp -lglfw -ldl -lpthread -o myapp<br> | | 4️⃣ Call | Use glAnsio::loadTextureAsync and glAnsio::processAnsioJobs() as shown in the example. | | 5️⃣ (Optional) Coroutines | Define GL_ANSIO_USE_COROUTINES before including the header and compile with -fcoroutines (GCC/Clang) or /std:c++latest (MSVC). Then you can write: cpp\nauto tex = co_await glAnsio::awaitTexture(asyncTex);\n | gl_ansio

bool await_ready() const noexcept return fut.wait_for(std::chrono::seconds(0)) == std::future_status::ready; void await_suspend(std::coroutine_handle<> h) const std::thread([h, fut = std::move(fut)]() mutable fut.wait(); // block in a dedicated thread h.resume(); // resume the awaiting coroutine ).detach();

namespace glAnsio {

#endif // GL_ANSIO_HAS_COROUTINES

// Render... glClearColor(0.1f, 0.12f, 0.15f, 1.0f); glClear(GL_COLOR_BUFFER_BIT);

/* ----------------------------------------------------------------------- Example usage (not part of the library, but handy to copy‑paste) ----------------------------------------------------------------------- */ #if 0 // ------------------------------------------------------------- int main() // ---- Init GLFW + GLAD ------------------------------------------------ glfwInit(); GLFWwindow* win = glfwCreateWindow(1280, 720, "gl_ansio demo", nullptr, nullptr); glfwMakeContextCurrent(win); gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);

/// Non‑blocking poll: true if the result is ready. bool ready() const return fut.wait_for(std::chrono::seconds(0)) == std::future_status::ready; Based on the potential of the GL-ANSIO technique,

~GLContext() // Do NOT destroy the window here – caller owns it. // Just detach the context from the thread. glfwMakeContextCurrent(nullptr);

// Process any pending GL uploads (must be on the GL thread) glAnsio::processAnsioJobs();