nkeynes@295: /**
nkeynes@295:  * $Id: rendsave.c,v 1.1 2007-01-16 10:34:46 nkeynes Exp $
nkeynes@295:  *
nkeynes@295:  * Scene-save support. This is mainly for test/debug purposes.
nkeynes@295:  *
nkeynes@295:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@295:  *
nkeynes@295:  * This program is free software; you can redistribute it and/or modify
nkeynes@295:  * it under the terms of the GNU General Public License as published by
nkeynes@295:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@295:  * (at your option) any later version.
nkeynes@295:  *
nkeynes@295:  * This program is distributed in the hope that it will be useful,
nkeynes@295:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@295:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@295:  * GNU General Public License for more details.
nkeynes@295:  */
nkeynes@295: 
nkeynes@295: #include <stdio.h>
nkeynes@295: #include <errno.h>
nkeynes@295: #include <time.h>
nkeynes@295: #include "pvr2/pvr2.h"
nkeynes@295: #include "dreamcast.h"
nkeynes@295: 
nkeynes@295: /**
nkeynes@295:  * Size of pages for the purposes of saving - this has nothing to do with the 
nkeynes@295:  * actual page size, of course.
nkeynes@295:  */
nkeynes@295: #define SAVE_PAGE_SIZE 1024
nkeynes@295: #define SAVE_PAGE_COUNT 8192
nkeynes@295: 
nkeynes@295: extern char *video_base;
nkeynes@295: 
nkeynes@295: /* Determine pages of memory to save. Start walking from the render tilemap
nkeynes@295:  * data and build up a page list
nkeynes@295:  */
nkeynes@295: static void pvr2_find_referenced_pages( char *pages )
nkeynes@295: {
nkeynes@295:     /* Dummy implementation - save everything */
nkeynes@295:     memset( pages, 1, SAVE_PAGE_COUNT );
nkeynes@295: }
nkeynes@295: 
nkeynes@295: /**
nkeynes@295:  * Save the current rendering data to a file for later analysis.
nkeynes@295:  * @return 0 on success, non-zero on failure.
nkeynes@295:  */
nkeynes@295: int pvr2_render_save_scene( const gchar *filename )
nkeynes@295: {
nkeynes@295:     struct header {
nkeynes@295: 	char magic[16];
nkeynes@295: 	uint32_t version;
nkeynes@295: 	uint32_t timestamp;
nkeynes@295: 	uint32_t frame_count;
nkeynes@295:     } scene_header;
nkeynes@295: 
nkeynes@295:     char page_map[SAVE_PAGE_COUNT];
nkeynes@295:     int i,j;
nkeynes@295:     pvr2_find_referenced_pages(page_map);
nkeynes@295:     
nkeynes@295:     FILE *f = fopen( filename, "wo" ); 
nkeynes@295:     if( f == NULL ) {
nkeynes@295: 	ERROR( "Unable to open file '%s' to write scene data: %s", filename, strerror(errno) );
nkeynes@295: 	return -1;
nkeynes@295:     }
nkeynes@295: 
nkeynes@295:     /* Header */
nkeynes@295:     memcpy( scene_header.magic, SCENE_SAVE_MAGIC, 16 );
nkeynes@295:     scene_header.version = SCENE_SAVE_VERSION;
nkeynes@295:     scene_header.timestamp = time(NULL);
nkeynes@295:     scene_header.frame_count = pvr2_get_frame_count();
nkeynes@295:     fwrite( &scene_header, sizeof(scene_header), 1, f );
nkeynes@295: 
nkeynes@295:     /* PVR2 registers - could probably be more specific, but doesn't 
nkeynes@295:      * really use a lot of space. Loader is assumed to know which
nkeynes@295:      * registers actually need to be set.
nkeynes@295:      */
nkeynes@295:     fwrite( mmio_region_PVR2.mem, 0x1000, 1, f );
nkeynes@295:     fwrite( mmio_region_PVR2PAL.mem, 0x1000, 1, f );
nkeynes@295: 
nkeynes@295:     /* Write out the VRAM pages we care about */
nkeynes@295:     for( i=0; i<SAVE_PAGE_COUNT; i++ ) {
nkeynes@295: 	if( page_map[i] != 0 ) {
nkeynes@295: 	    for( j=i+1; j<SAVE_PAGE_COUNT && page_map[j] != 0; j++ );
nkeynes@295: 	    /* Write region from i..j-1 */
nkeynes@295: 	    uint32_t start = i * SAVE_PAGE_SIZE;
nkeynes@295: 	    uint32_t length = (j-i) * SAVE_PAGE_SIZE;
nkeynes@295: 	    fwrite( &start, sizeof(uint32_t), 1, f );
nkeynes@295: 	    fwrite( &length, sizeof(uint32_t), 1, f );
nkeynes@295: 	    fwrite( video_base + start, 1, length, f );
nkeynes@295: 	    i = j-1;
nkeynes@295: 	}
nkeynes@295:     }
nkeynes@295:     /* Write out the EOF marker */
nkeynes@295:     uint32_t eof = 0xFFFFFFFF;
nkeynes@295:     fwrite( &eof, sizeof(uint32_t), 1, f );
nkeynes@295:     fclose( f );
nkeynes@295: }