GBA Development/Source

This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This work is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

#include <mygba.h>

// Global variables
int curX, curY, curColor;
u8 cR, cG, cB;

//Function that draws a single pixel to the screen
void drawPix(int xPos, int yPos, int color)
{
   unsigned short* videoBuffer = (unsigned short*)0x6000000;
   videoBuffer[(yPos*240) + xPos] = color;
}

//Gets input from the joypad
void query_input()
{
      if (F_CTRLINPUT_UP_PRESSED)
         curY--;
      if (F_CTRLINPUT_DOWN_PRESSED)
         curY++;
      if (F_CTRLINPUT_LEFT_PRESSED)
         curX--;
      if (F_CTRLINPUT_RIGHT_PRESSED)
         curX++;
      if (F_CTRLINPUT_B_PRESSED)
         curColor = RGB(++cR, cG, cB);
      if (F_CTRLINPUT_A_PRESSED)
         curColor = RGB(cR, ++cG, cB);
      if (F_CTRLINPUT_L_PRESSED)
         curColor = RGB(cR, cG, ++cB);
      if (F_CTRLINPUT_R_PRESSED)
      {
         cR = 0xFF;
         cG = 0xFF;
         cB = 0xFF;
         curColor = RGB(cR, cG, cB);
      }

}

// Function called every screen refresh
void vbl_func()
{
      query_input();
      drawPix(curX,curY, curColor);
}

//Program entrance
int main(void)
{

   // Initializing HAM and background mode
   ham_Init();
   ham_SetBgMode(3);

   // Initializing global variables
   curX = 0;
   curY = 0;
   cR = 0xFF;
   cG = 0xFF;
   cB = 0xFF;
   curColor = 0xFFFF;

   //Starts running the vbl_func every screen refresh
   ham_StartIntHandler(INT_TYPE_VBL,(void*)&vbl_func);

   while(true)
   {
   }
   return 0;
}