main.cpp

/*

Text Tracer - A real-time raytracer
TODO:
Recursive Ray-kD Tree intersection
Fix AABB slice issue, backface rendering & cleanup

Material class for storing colour, lighting factors, reflectiveness etc
Universal portal transport for all ray types (shadow esp.)
PhysicsObject
Reflectiveness
Separate 2D geometry into it's own base class (or use PlaneObject)

Sphere orientation calculation (L should be camera-oriented, not viewport-oriented)?

Preprocessor definitions:
LOW_RES
Disabled: Run in full resolution
Enabled: Run in half resolution

REALTIME
Disabled: Update/Draw one frame, then quit
Enabled: Update/Draw according to FPS constants until user quits

DISABLE_LIGHTING:
Disabled: All objects will be rendered at full brightness
Enabled: All objects will be smoothly lit with hard shadows
*/

#define REALTIME

#include <ctime>

#include "TextTracer.h"

const int RENDER_FPS = 60;
const int UPDATE_FPS = 60;

int worldClock = 0;
int prevRenderTicks = 0;
int prevUpdateTicks = 0;
bool redraw = true;
bool update = true;

bool quit = false;

int main()
{
    // Initialization
    TextTracer textTracer;

#ifdef REALTIME
    while(!quit)
    {
#endif
        // Cap update to tick rate
        worldClock = clock();
        int updateTicks = worldClock % (CLOCKS_PER_SEC / UPDATE_FPS);
        if(updateTicks == 0 && prevUpdateTicks != 0)
        {
            update = true;
        }
        prevUpdateTicks = updateTicks;

        if(update)
        {
            // Quit
            if(textTracer.IsKeyDown(0x1B)) // Esc
            {
                quit = true;
            }

            textTracer.Update(worldClock);
            update = false;
        }

        // Cap rendering to frame rate
        int renderTicks = worldClock % (CLOCKS_PER_SEC / RENDER_FPS);
        if(renderTicks == 0 && prevRenderTicks != 0)
        {
            redraw = true;
        }
        prevRenderTicks = renderTicks;

        if(redraw)
        {
            textTracer.Draw();
            redraw = false;
        }
#ifdef REALTIME
    }
#endif

    return 0;
}