Method BackToFront

engine/PoseidonGL33/EngineGL33_VertexBuffer.cpp:562–593

}

void EngineGL33::BackToFront()
{
    // SSAA: the game frame (3D + HUD) is complete on the scaled target —
    // resolve + downsample it into the default framebuffer first, so the
    // overlay renders at native size and the screenshot reads the final
    // pixels the user sees.
    ResolveSSAAToDefault();

    // ImGui composites on top of game + HUD.  Render BEFORE the screenshot
    // capture so trident captures include the overlay (same pixels the user
    // sees after SwapWindow).  Both calls are safe no-ops when disabled.
    DebugOverlay::NewFrame();
    DebugOverlay::Render();
    // ImGui's GL backend binds its own VAO/textures — drop the bind cache
    // so the next cached bind re-applies real state (B-007).
    GL33Bind::Invalidate();
    InvalidatePipelineCache();

    // Trident's `triScreenshot` enqueues a path; we capture here so the
    // readback samples the same back buffer that's about to swap.
    // Readback after SwapWindow on a double-buffered context is
    // undefined, so the capture has to happen pre-swap.
    CaptureScreenshotIfPending();

    if (_glContext && _sdlWindow)
        SDL_GL_SwapWindow(_sdlWindow);

    // Frame boundary: apply a pending render-scale change and (re)bind the
    // frame render target for the next frame's draws.
    ApplyPendingRenderScale();
    BindFrameRenderTarget();
}

int EngineGL33::SampleBackBufferNonBlack()
{