C++ clone of rust gba-console's hello_world.rs example

hello_world.cpp

#include <gba.hpp>

#define EVER ;;

using namespace gba;

int main( int argc, char * argv[] ) {
  display::control = display::mode( 3 ).enable_layers( { 2 } );

  uint8 px = gba::mode3.width / 2;
  uint8 py = gba::mode3.height / 2;
  auto color = gba::color( 31, 0, 0 );

  for ( EVER ) {
    // read our keys for this frame
    auto this_frame_keys = keys.read_keys();

    // adjust game state and wait for vblank
    px += 2 * this_frame_keys.pad.axis_x();
    py += 2 * this_frame_keys.pad.axis_y();
    if ( this_frame_keys.button.L ) {
      color <<= 5;
    }
    if ( this_frame_keys.button.R ) {
      color >>= 5;
    }

    // now we wait
    display::wait_vblank();

    // draw the new game and wait until the next frame starts.
    if ( px >= 240 || py >= 160 ) {
      // out of bounds, reset the screen and position.
      gba::mode3.fill( gba::color() );
      px = gba::mode3.width / 2;
      py = gba::mode3.height / 2;
    } else {
      // draw the new part of the line
      gba::mode3.fill( color, { px, py, 2, 2 } );
    }

    // now we wait again
    display::wait_vdraw();
  }
}