gpu.c

/***************************************************************************
 *   This program 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 program 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 "gpu.h"
#include "psxdma.h"

void gpu_state_change(int what, int cycles)
{
	enum psx_gpu_state state = what;
	switch (state)
	{
	case PGS_VRAM_TRANSFER_START:
		psxRegs.gpuIdleAfter = psxRegs.cycle + PSXCLK / 50;
		break;
	case PGS_VRAM_TRANSFER_END:
		psxRegs.gpuIdleAfter = psxRegs.cycle - 1;
		break;
	case PGS_PRIMITIVE_START:
		// limit because gpulib delays things with it's buffering...
		if (cycles > 512)
			cycles = 512;
		psxRegs.gpuIdleAfter = psxRegs.cycle + cycles - 1;
		break;
	}
}