/*
DS_ScrollBackground:
Positions the screen as to center it over the emulated cursor.
*/
LOCALPROC DS_ScrollBackground(void)
{
int ScrollX = 0;
int ScrollY = 0;
int Scale = 0;
/*
TODO:
Lots of magic numbers here.
*/
#if EnableMagnify
if (WantMagnify) {
ScrollX = ((int) CurMouseH) - (DS_ScreenWidth / 4);
ScrollY = ((int) CurMouseV) - (DS_ScreenHeight / 4);
Scale = 128;
ScrollX = ScrollX > vMacScreenWidth - (DS_ScreenWidth / 2)
? vMacScreenWidth - (DS_ScreenWidth / 2)
: ScrollX;
ScrollY = ScrollY > vMacScreenHeight - (DS_ScreenHeight / 2)
? vMacScreenHeight - (DS_ScreenHeight / 2)
: ScrollY;
} else
#endif
{
ScrollX = ((int) CurMouseH) - (DS_ScreenWidth / 2);
ScrollY = ((int) CurMouseV) - (DS_ScreenHeight / 2);
Scale = 256;
ScrollX = ScrollX > vMacScreenWidth - DS_ScreenWidth
? vMacScreenWidth - DS_ScreenWidth
: ScrollX;
ScrollY = ScrollY > vMacScreenHeight - DS_ScreenHeight
? vMacScreenHeight - DS_ScreenHeight
: ScrollY;
}
ScrollX = ScrollX < 0 ? 0 : ScrollX;
ScrollY = ScrollY < 0 ? 0 : ScrollY;
if (Display_bg2_Main) {
bgSetScale(Display_bg2_Main, Scale, Scale);
bgSetScroll(Display_bg2_Main, ScrollX, ScrollY);
}
}
void advScaling(void)
{
videoSetMode(MODE_5_2D);
vramSetBankA(VRAM_A_MAIN_BG);
int bg = bgInit(3, BgType_ExRotation, BgSize_ER_256x256, 0,1);
dmaCopy(TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
dmaCopy(Layer256x256Map, bgGetMapPtr(bg), Layer256x256MapLen);
bgMosaicEnable(bg);
int keys = 0;
int scale_x = 1 << 8;
int scale_y = 1 << 8;
while(!(keys & KEY_B))
{
scanKeys();
keys = keysHeld();
if(keys & KEY_UP) scale_y++;
if(keys & KEY_DOWN) scale_y--;
if(keys & KEY_LEFT) scale_x++;
if(keys & KEY_RIGHT) scale_x--;
swiWaitForVBlank();
bgSetScale(bg, scale_x , scale_y );
bgUpdate();
consoleClear();
iprintf("Press B to exit.n");
iprintf("scale X: %d scale Y: %d", scale_x, scale_y);
}
}