lodutil.cpp

空战游戏flacon源码

#include "header.h"
#include "LODutil.h"

void readObjectDescription (char *str, CStreamIO &file)
{
	int		i;
	char	c;
	char	*savestr = str;
	while (1) {
		if (file.read ("%c", &c) == -1) {
			*str = '\0';
			return;
		}
		if (c != ' ' && c != '\t') {
			*str++ = c;
			break;
		}
	}
	if (savestr[0] == '\n') {
		strcpy (savestr, "No Description");
		return;
	}
	file.readline (str, GL_MAX_DESCRIPTION);
	savestr[GL_MAX_DESCRIPTION-1] = '\0';
	for (i=0; i < GL_MAX_DESCRIPTION; i++) {
		if (savestr[i] == '\n') savestr[i] = '\0';
		if (savestr[i] == '\0') break;
	}
	if (savestr[0] == '\0') strcpy (savestr, "No Description");
}

int getLODData (char *name, lodPtr **lod)
{
	CFileIO myfile;

	char infile[GL_NAMESIZE];
	glConcatFileExtension ((GLbyte *) infile, (GLbyte *) name, (GLbyte *) "FLT");
	if (!myfile.openread (infile)) {
		printf ("Can not open input file %s\n", infile);
		exit (1);
	}

	*lod = 0;
	lodPtr *newlod = 0;
	lodPtr *curlod = 0;
	int totallod = 0;
	while (!myfile.eof()) {
		char *record = getRecord (myfile);
		if (!record) exit (1);
		swapRecord (record);
		short *srec = (short *) record;
		short rectype = *srec++;
		short reclen = *srec++;
		if (rectype == OPCODE_LEVEL_OF_DETAIL) {
			newlod = (lodPtr *) glAllocateMemory (sizeof(lodPtr));
			if (!newlod) {
				printf ("Can not allocate lod memory!\n");
				exit (1);
			}
			flt_LODRecord *lodrec = (flt_LODRecord *) record;
			newlod -> next = 0;
			newlod -> flag = 0;
			newlod -> distance = (GLint) lodrec -> switchin;
			if (*lod) {
				curlod -> next = newlod;
				curlod = newlod;
			}
			else {
				*lod = curlod = newlod;
			}
			totallod++;
		}
		else if (rectype == OPCODE_EXTERNAL_REFERENCE) {
			if (newlod) {
				flt_ExternalReferenceRecord *extrec = 
							(flt_ExternalReferenceRecord *) record;
				int i = getUnixFilename (extrec -> filename);
				strncpy (newlod -> name, &(extrec -> filename[i]), GL_NAMESIZE);
				newlod -> name[GL_NAMESIZE-1] = '\0';
			}
		}
		glReleaseMemory ((char *) record);
	}
	myfile.closefile();

	printf ("Processing file %s\n", infile);
	if (!totallod) {
		totallod = 1;
		*lod = (lodPtr *) glAllocateMemory (sizeof (lodPtr));
		if (!*lod) {
			printf ("Can not allocate lod memory!\n");
			exit (1);
		}
		(*lod) -> next = 0;
		(*lod) -> distance = 0x7fffffff;
		(*lod) -> flag = 0;
		strcpy ((*lod) -> name, name);
		(*lod) -> name[GL_NAMESIZE-1] = '\0';
	}
	return totallod;
}