/**

 * $Id: pvr2mem.c,v 1.2 2007-01-15 10:10:51 nkeynes Exp $

 *

 * PVR2 (Video) VRAM handling routines (mainly for the 64-bit region)

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * 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 "pvr2.h"

extern char *video_base;

void pvr2_vram64_write( sh4addr_t destaddr, char *src, uint32_t length )

{

    int bank_flag = (destaddr & 0x04) >> 2;

    uint32_t *banks[2];

    uint32_t *dwsrc;

    int i;

    destaddr = destaddr & 0x7FFFFF;

    if( destaddr + length > 0x800000 ) {

	length = 0x800000 - destaddr;

    }

    for( i=destaddr & 0xFFFFF000; i < destaddr + length; i+= PAGE_SIZE ) {

	texcache_invalidate_page( i );

    }

    banks[0] = ((uint32_t *)(video_base + ((destaddr & 0x007FFFF8) >>1)));

    banks[1] = banks[0] + 0x100000;

    if( bank_flag ) 

	banks[0]++;

    /* Handle non-aligned start of source */

    if( destaddr & 0x03 ) {

	char *dest = ((char *)banks[bank_flag]) + (destaddr & 0x03);

	for( i= destaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

	    *dest++ = *src++;

	}

	bank_flag = !bank_flag;

    }

    dwsrc = (uint32_t *)src;

    while( length >= 4 ) {

	*banks[bank_flag]++ = *dwsrc++;

	bank_flag = !bank_flag;

	length -= 4;

    }

    /* Handle non-aligned end of source */

    if( length ) {

	src = (char *)dwsrc;

	char *dest = (char *)banks[bank_flag];

	while( length-- > 0 ) {

	    *dest++ = *src++;

	}

    }  

}

/**

 * Write an image to 64-bit vram, with a line-stride different from the line-size.

 * The destaddr must be 32-bit aligned, and both line_bytes and line_stride_bytes

 * must be multiples of 4.

 */

void pvr2_vram64_write_stride( sh4addr_t destaddr, char *src, uint32_t line_bytes, 

			       uint32_t line_stride_bytes, uint32_t line_count )

{

    int bank_flag = (destaddr & 0x04) >> 2;

    uint32_t *banks[2];

    uint32_t *dwsrc;

    uint32_t line_gap;

    int line_gap_flag;

    int i,j;

    destaddr = destaddr & 0x7FFFF8;

    i = line_stride_bytes - line_bytes;

    line_gap_flag = i & 0x04;

    line_gap = i >> 3;

    line_bytes >>= 2;

    for( i=destaddr & 0xFFFFF000; i < destaddr + line_stride_bytes*line_count; i+= PAGE_SIZE ) {

	texcache_invalidate_page( i );

    }

    banks[0] = (uint32_t *)(video_base + (destaddr >>1));

    banks[1] = banks[0] + 0x100000;

    if( bank_flag ) 

	banks[0]++;

    dwsrc = (uint32_t *)src;

    for( i=0; i<line_count; i++ ) {

	for( j=0; j<line_bytes; j++ ) {

	    *banks[bank_flag]++ = *dwsrc++;

	    bank_flag = !bank_flag;

	}

	banks[0] += line_gap;

	banks[1] += line_gap;

	if( line_gap_flag ) {

	    banks[bank_flag]++;

	    bank_flag = !bank_flag;

	}

    }    

}

/**

 * Read an image from 64-bit vram, with a destination line-stride different from the line-size.

 * The srcaddr must be 32-bit aligned, and both line_bytes and line_stride_bytes

 * must be multiples of 4. line_stride_bytes must be >= line_bytes.

 * This method is used to extract a "stride" texture from vram.

 */

void pvr2_vram64_read_stride( char *dest, uint32_t dest_line_bytes, sh4addr_t srcaddr,

				   uint32_t src_line_bytes, uint32_t line_count )

{

    int bank_flag = (srcaddr & 0x04) >> 2;

    uint32_t *banks[2];

    uint32_t *dwdest;

    uint32_t dest_line_gap;

    uint32_t src_line_gap;

    uint32_t line_bytes;

    int src_line_gap_flag;

    int i,j;

    srcaddr = srcaddr & 0x7FFFF8;

    if( src_line_bytes <= dest_line_bytes ) {

	dest_line_gap = (dest_line_bytes - src_line_bytes) >> 2;

	src_line_gap = 0;

	src_line_gap_flag = 0;

	line_bytes = src_line_bytes >> 2;

    } else {

	i = (src_line_bytes - dest_line_bytes);

	src_line_gap_flag = i & 0x04;

	src_line_gap = i >> 3;

	line_bytes = dest_line_bytes >> 2;

    }

    banks[0] = (uint32_t *)(video_base + (srcaddr>>1));

    banks[1] = banks[0] + 0x100000;

    if( bank_flag )

	banks[0]++;

    dwdest = (uint32_t *)dest;

    for( i=0; i<line_count; i++ ) {

	for( j=0; j<line_bytes; j++ ) {

	    *dwdest++ = *banks[bank_flag]++;

	    bank_flag = !bank_flag;

	}

	dwdest += dest_line_gap;

	banks[0] += src_line_gap;

	banks[1] += src_line_gap;

	if( src_line_gap_flag ) {

	    banks[bank_flag]++;

	    bank_flag = !bank_flag;

	}

    }

}

void pvr2_vram_write_invert( sh4addr_t destaddr, char *src, uint32_t length, uint32_t line_length )

{

    char *dest = video_base + (destaddr & 0x007FFFFF);

    char *p = src + length - line_length;

    while( p >= src ) {

	memcpy( dest, p, line_length );

	p -= line_length;

	dest += line_length;

    }

}

void pvr2_vram64_read( char *dest, sh4addr_t srcaddr, uint32_t length )

{

    int bank_flag = (srcaddr & 0x04) >> 2;

    uint32_t *banks[2];

    uint32_t *dwdest;

    int i;

    srcaddr = srcaddr & 0x7FFFFF;

    if( srcaddr + length > 0x800000 )

	length = 0x800000 - srcaddr;

    banks[0] = ((uint32_t *)(video_base + ((srcaddr&0x007FFFF8)>>1)));

    banks[1] = banks[0] + 0x100000;

    if( bank_flag )

	banks[0]++;

    /* Handle non-aligned start of source */

    if( srcaddr & 0x03 ) {

	char *src = ((char *)banks[bank_flag]) + (srcaddr & 0x03);

	for( i= srcaddr & 0x03; i < 4 && length > 0; i++, length-- ) {

	    *dest++ = *src++;

	}

	bank_flag = !bank_flag;

    }

    dwdest = (uint32_t *)dest;

    while( length >= 4 ) {

	*dwdest++ = *banks[bank_flag]++;

	bank_flag = !bank_flag;

	length -= 4;

    }

    /* Handle non-aligned end of source */

    if( length ) {

	dest = (char *)dwdest;

	char *src = (char *)banks[bank_flag];

	while( length-- > 0 ) {

	    *dest++ = *src++;

	}

    }

}

void pvr2_vram64_dump( sh4addr_t addr, uint32_t length, FILE *f ) 

{

    char tmp[length];

    pvr2_vram64_read( tmp, addr, length );

    fwrite_dump( tmp, length, f );

}