Method render

deps/opencv/modules/core/src/opengl_interop.cpp:1418–1488

// Rendering

void cv::ogl::render(const ogl::Texture2D& tex, Rect_<double> wndRect, Rect_<double> texRect)
{
#ifndef HAVE_OPENGL
    (void) tex;
    (void) wndRect;
    (void) texRect;
    throw_nogl();
#else
    if (!tex.empty())
    {
        gl::MatrixMode(gl::PROJECTION);
        gl::LoadIdentity();
        gl::Ortho(0.0, 1.0, 1.0, 0.0, -1.0, 1.0);
        CV_CheckGlError();

        gl::MatrixMode(gl::MODELVIEW);
        gl::LoadIdentity();
        CV_CheckGlError();

        gl::Disable(gl::LIGHTING);
        CV_CheckGlError();

        tex.bind();

        gl::Enable(gl::TEXTURE_2D);
        CV_CheckGlError();

        gl::TexEnvi(gl::TEXTURE_ENV, gl::TEXTURE_ENV_MODE, gl::REPLACE);
        CV_CheckGlError();

        gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR);
        CV_CheckGlError();

        const float vertex[] =
        {
            wndRect.x, wndRect.y, 0.0f,
            wndRect.x, (wndRect.y + wndRect.height), 0.0f,
            wndRect.x + wndRect.width, (wndRect.y + wndRect.height), 0.0f,
            wndRect.x + wndRect.width, wndRect.y, 0.0f
        };
        const float texCoords[] =
        {
            texRect.x, texRect.y,
            texRect.x, texRect.y + texRect.height,
            texRect.x + texRect.width, texRect.y + texRect.height,
            texRect.x + texRect.width, texRect.y
        };

        ogl::Buffer::unbind(ogl::Buffer::ARRAY_BUFFER);

        gl::EnableClientState(gl::TEXTURE_COORD_ARRAY);
        CV_CheckGlError();

        gl::TexCoordPointer(2, gl::FLOAT, 0, texCoords);
        CV_CheckGlError();

        gl::DisableClientState(gl::NORMAL_ARRAY);
        gl::DisableClientState(gl::COLOR_ARRAY);