/*
 * PSP Software Development Kit - https://github.com/pspdev
 * -----------------------------------------------------------------------
 * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
 *
 * Copyright (c) 2010 Dan Peori
 */

#include <pspge.h>
#include <pspgu.h>

#define ALIGNMENT 16

static unsigned int staticOffset = 0;

static unsigned int getMemorySize(unsigned int width, unsigned int height, unsigned int psm)
{
	switch (psm)
	{
	case GU_PSM_T4:
		return (width * height) >> 1;
	case GU_PSM_T8:
		return width * height;
	case GU_PSM_5650:
	case GU_PSM_5551:
	case GU_PSM_4444:
	case GU_PSM_T16:
		return 2 * width * height;
	case GU_PSM_8888:
	case GU_PSM_T32:
		return 4 * width * height;
	default:
		return 0;
	}
}

void *guGetStaticVramBuffer(unsigned int width, unsigned int height, unsigned int psm)
{
	unsigned int memSize = getMemorySize(width, height, psm);
	staticOffset = (staticOffset + (ALIGNMENT - 1)) & ~(ALIGNMENT - 1);
	void *result = (void *)staticOffset;
	staticOffset += memSize;

	return result;
}

void *guGetStaticVramTexture(unsigned int width, unsigned int height, unsigned int psm)
{
	void *result = guGetStaticVramBuffer(width, height, psm);
	return (void *)(((unsigned int)result) + ((unsigned int)sceGeEdramGetAddr()));
}