/*
 * Copyright (c) 2024 Ross Cunniff
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "libglut.oah"
#include "libgl1.oah"

var angle1 = 0.0, angle2 = 0.0;

proc winshape(w, h)
{
    var x = 0, y = 0;

    if (w < h) { y = (h - w) / 2; h = w; }
    else       { x = (w - h) / 2; w = h; }
    gl1::Viewport(x, y, w, h);
}

proc display()
{
    var s;

    angle1 += 0.1;
    angle2 += 0.11;

    gl1::LoadIdentity();
    gl1::Rotatef(angle2, 0.0, 0.0, 1.0);
    gl1::Rotatef(angle1, 0.0, 1.0, 0.0);

    gl1::ClearColor(0.0,0.0,0.0,1.0);
    gl1::Clear(gl1::COLOR_BUFFER_BIT|gl1::DEPTH_BUFFER_BIT);
    glut::WireTeapot(0.75);
    glut::SwapBuffers();
    glut::PostRedisplay();
}

proc main(args)
{
    glut::Init(args);
    glut::InitDisplayMode(glut::RGBA | glut::DOUBLE | glut::DEPTH);
    if( !glut::Get(glut::DISPLAY_MODE_POSSIBLE) ) {
        "Error setting display mode\n";
        oadl::halt();
    }
    glut::CreateWindow("Demo\0"); // Note the NULL-termination
    glut::DisplayFunc(display);
    glut::ReshapeFunc(winshape);
    glut::MainLoop();
}