Method onBegin

core/2d/RenderTexture.cpp:600–639

}

void RenderTexture::onBegin()
{
    _oldProjMatrix = _director->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION);
    _director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, _projectionMatrix);

    _oldTransMatrix = _director->getMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
    _director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, _transformMatrix);

    if (!_keepMatrix)
    {
        _director->setProjection(_director->getProjection());
        const Vec2& texSize = _texture2D->getContentSizeInPixels();

        // Calculate the adjustment ratios based on the old and new projections
        Vec2 size         = _director->getWinSizeInPixels();
        float widthRatio  = size.width / texSize.width;
        float heightRatio = size.height / texSize.height;

        Mat4 orthoMatrix;
        Mat4::createOrthographicOffCenter((float)-1.0 / widthRatio, (float)1.0 / widthRatio, (float)-1.0 / heightRatio,
                                          (float)1.0 / heightRatio, -1, 1, &orthoMatrix);
        _director->multiplyMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_PROJECTION, orthoMatrix);
    }

    Rect viewport;
    viewport.size.width           = _fullviewPort.size.width;
    viewport.size.height          = _fullviewPort.size.height;
    float viewPortRectWidthRatio  = float(viewport.size.width) / _fullRect.size.width;
    float viewPortRectHeightRatio = float(viewport.size.height) / _fullRect.size.height;
    viewport.origin.x             = (_fullRect.origin.x - _rtTextureRect.origin.x) * viewPortRectWidthRatio;
    viewport.origin.y             = (_fullRect.origin.y - _rtTextureRect.origin.y) * viewPortRectHeightRatio;

    Renderer* renderer = _director->getRenderer();

    _oldViewport = renderer->getViewport();
    renderer->setViewPort(viewport.origin.x, viewport.origin.y, viewport.size.width, viewport.size.height);

    _oldRenderTarget = renderer->getRenderTarget();
    renderer->setRenderTarget(_renderTarget);
}

void RenderTexture::onEnd()
{