Screen capture (🟠WIP)

Render screen to file

Download save_image.h and stb_image_write.h next to your main.cpp.

// for debug
#include "save_image.h"


int frame = 0;
while (!glfwWindowShouldClose(window)) {

    uniforms.time = frame / 25.0f;
    queue.writeBuffer(uniformBuffer, offsetof(MyUniforms, time), &uniforms.time, sizeof(MyUniforms::time));

    // [...]

    // export video frame
    saveTextureView(resolvePath(frame), device, nextTexture, 640, 480);
    ++frame;
    if (frame >= 100) {
        break;
    }

    wgpuTextureViewDrop(nextTexture);
    m_swapChain.present();
}

After introducing the Application class:

// for debug
#include "save_image.h"


void Application::onFrame() {
    static int frame = 0;

    // [...]

    m_uniforms.time = frame / 25.0f;
    queue.writeBuffer(m_uniformBuffer, offsetof(MyUniforms, time), &m_uniforms.time, sizeof(MyUniforms::time));

    // Optional: mock mouse clicks to rotate the view point
    double xpos = m_swapChainDesc.width / 2 + 50 * cos(PI / 2 * m_uniforms.time);
    double ypos = m_swapChainDesc.height / 2 + 50 * sin(PI / 2 * m_uniforms.time);
    glfwSetCursorPos(m_window, xpos, ypos);
    if (frame == 0) {
        onMouseButton(GLFW_MOUSE_BUTTON_LEFT, GLFW_PRESS, 0);
    }

    // [...]

    // export video frame
    saveTextureView(resolvePath(frame), m_device, nextTexture, m_swapChainDesc.width, m_swapChainDesc.height);
    ++frame;
    if (frame >= 100) {
        onFinish();
        exit(0);
    }

    wgpuTextureViewDrop(nextTexture);
    m_swapChain.present();
}