/* exec.library VBlank interrupt handler */
AROS_INTH1(VBlankInt, struct TimerBase *, TimerBase)
{
AROS_INTFUNC_INIT
/* UpdateEClock and process VBlank timer*/
EClockUpdate(TimerBase);
handleVBlank(TimerBase, SysBase);
/* exec should continue with other servers */
return 0;
AROS_INTFUNC_EXIT
}
void setLCDStatus(struct gameboy * gameboy)
{
//it take 456 clock cycles to draw 1 scanline
//LCD status is in mode 2 for the first 80 (search sprite attrs)
//Mode 3 is set for the next 172 (transfer to LCD driver)
//The remaining 204 are for mode 0 (hBlank)
//When the status mode is changed to 0, 1 or 2, an interrupt request occurs
//Check bit 3, 4, or 5 to see if mode interrupt 0, 1 or 2 is enabled
//when the lcd mode is disabled, the status mode must be set to 1
if (!isLCDEnabled(gameboy)){
//starting a new scan line sets the lcd status to 2
//printf("LCD isn't enabled - starting new scanline\n");
startNewScanline(gameboy);
}
else {
// printf("LCD is enabled\n");
if (isInVBlankBounds(gameboy)){
//printf("Handle vblank\n");
handleVBlank(gameboy);
}
else if (isInSpriteAttributeBounds(gameboy)){
//printf("Handle OAM\n");
handleSpriteSearch(gameboy);
}
else if (isInDriverTransferBounds(gameboy)){
//printf("handle transfer\n");
handleTransferToLCDDriver(gameboy);
}
else {
//printf("handle hblank\n");
handleHBlank(gameboy);
}
}
}
