Method BeginPass

engine/PoseidonGL33/EngineGL33_Queue.cpp:303–353

}

void EngineGL33::BeginPass(PassId passId)
{
    if (IsIn3DPass())
    {
        LOG_DEBUG(Graphics, "GL33: BeginPass({}) already in 3D (passId={}), just updating", static_cast<int>(passId),
                  static_cast<int>(_activePassId));
        if (_activePassId != passId)
            SwitchPassDebugGroup(PassIdName(passId));
        _activePassId = passId;
        return;
    }
    LOG_DEBUG(Graphics, "GL33: BeginPass({}) from ScreenSpace — FULL INIT", static_cast<int>(passId));
    FlushAndFreeAllQueues(_queueNo);
    SwitchPassDebugGroup(PassIdName(passId));
    _activePassId = passId;

    SelectVertexShader(VSTransform);
    // BeginPass bootstraps the 3D pass through the normal mesh shader before
    // the first descriptor-owned draw. If the previous 3D draw had the same
    // descriptor as the first draw in this pass (for example two shadow
    // markers separated by a screen pass), ApplyPipeline would otherwise skip
    // and leave VSTransform paired with PSShadow.
    InvalidatePipelineCache();

    // D3D convention: CW = front face. With glClipControl(GL_LOWER_LEFT),
    // no viewport Y-flip occurs, so mesh winding is preserved from NDC to window.
    Poseidon::render::cull::Back();
    Poseidon::render::cull::FrontFaceCW();
    Poseidon::render::pipeline::EnableDepthTest();
    Poseidon::render::pipeline::DisableDepthClamp();
    // Colour writes are RGBA for the whole 3D pass.  ApplyPipeline no longer
    // toggles the colour mask per draw (nothing disables it now), so assert
    // it once here to keep the invariant load-bearing rather than implicit.
    Poseidon::render::pipeline::SetColorMask(true);

    if (GScene)
    {
        _frameState = BuildFrameState(GScene->GetCamera(), GScene->MainLight(), _bias, _fogColor, _sunEnabled);
        _drawItems.clear();
        _currentDrawItem = DrawItem{};

        UploadFrameConstants(_frameState);
        // Bind the (previous frame's) shadow depth map + light-VP for the lit
        // shaders.  No-op until a depth pass has run with shadow maps enabled.
        UpdateShadowMapLitState();
    }

    // Crop the 3D scene to the AspectSettings world rect (pillarbox /
    // manual noodle).  No-op when the rect is full.
    ApplyWorldViewport();
}

void EngineGL33::BeginScreenPass()
{