From db9fbe603f8d130e5f83f65287e579483cb2d267 Mon Sep 17 00:00:00 2001 From: curt Date: Sat, 24 Jan 1998 13:03:21 +0000 Subject: [PATCH] Initial revision. Taken from Mark Kilgard's GLUT examples. --- Scenery/texload.c | 253 ++++++++++++++++++++++++++++++++++++++++++++++ Scenery/texload.h | 19 ++++ 2 files changed, 272 insertions(+) create mode 100644 Scenery/texload.c create mode 100644 Scenery/texload.h diff --git a/Scenery/texload.c b/Scenery/texload.c new file mode 100644 index 000000000..0995f1654 --- /dev/null +++ b/Scenery/texload.c @@ -0,0 +1,253 @@ + +/* texture.c - by David Blythe, SGI */ + +/* texload is a simplistic routine for reading an SGI .rgb image file. */ + +#include +#include +#include + +#include "texload.h" + +typedef struct _ImageRec { + unsigned short imagic; + unsigned short type; + unsigned short dim; + unsigned short xsize, ysize, zsize; + unsigned int min, max; + unsigned int wasteBytes; + char name[80]; + unsigned long colorMap; + FILE *file; + unsigned char *tmp; + unsigned long rleEnd; + unsigned int *rowStart; + int *rowSize; +} ImageRec; + +void +rgbtorgb(unsigned char *r,unsigned char *g,unsigned char *b,unsigned char *l,int n) { + while(n--) { + l[0] = r[0]; + l[1] = g[0]; + l[2] = b[0]; + l += 3; r++; g++; b++; + } +} + +static void +ConvertShort(unsigned short *array, unsigned int length) { + unsigned short b1, b2; + unsigned char *ptr; + + ptr = (unsigned char *)array; + while (length--) { + b1 = *ptr++; + b2 = *ptr++; + *array++ = (b1 << 8) | (b2); + } +} + +static void +ConvertUint(unsigned *array, unsigned int length) { + unsigned int b1, b2, b3, b4; + unsigned char *ptr; + + ptr = (unsigned char *)array; + while (length--) { + b1 = *ptr++; + b2 = *ptr++; + b3 = *ptr++; + b4 = *ptr++; + *array++ = (b1 << 24) | (b2 << 16) | (b3 << 8) | (b4); + } +} + +static ImageRec *ImageOpen(char *fileName) +{ + union { + int testWord; + char testByte[4]; + } endianTest; + ImageRec *image; + int swapFlag; + int x; + + endianTest.testWord = 1; + if (endianTest.testByte[0] == 1) { + swapFlag = 1; + } else { + swapFlag = 0; + } + + image = (ImageRec *)malloc(sizeof(ImageRec)); + if (image == NULL) { + fprintf(stderr, "Out of memory!\n"); + exit(1); + } + if ((image->file = fopen(fileName, "rb")) == NULL) { + return NULL; + } + + fread(image, 1, 12, image->file); + + if (swapFlag) { + ConvertShort(&image->imagic, 6); + } + + image->tmp = (unsigned char *)malloc(image->xsize*256); + if (image->tmp == NULL) { + fprintf(stderr, "\nOut of memory!\n"); + exit(1); + } + + if ((image->type & 0xFF00) == 0x0100) { + x = image->ysize * image->zsize * (int) sizeof(unsigned); + image->rowStart = (unsigned *)malloc(x); + image->rowSize = (int *)malloc(x); + if (image->rowStart == NULL || image->rowSize == NULL) { + fprintf(stderr, "\nOut of memory!\n"); + exit(1); + } + image->rleEnd = 512 + (2 * x); + fseek(image->file, 512, SEEK_SET); + fread(image->rowStart, 1, x, image->file); + fread(image->rowSize, 1, x, image->file); + if (swapFlag) { + ConvertUint(image->rowStart, x/(int) sizeof(unsigned)); + ConvertUint((unsigned *)image->rowSize, x/(int) sizeof(int)); + } + } + return image; +} + +static void +ImageClose(ImageRec *image) { + fclose(image->file); + free(image->tmp); + free(image); +} + +static void +ImageGetRow(ImageRec *image, unsigned char *buf, int y, int z) { + unsigned char *iPtr, *oPtr, pixel; + int count; + + if ((image->type & 0xFF00) == 0x0100) { + fseek(image->file, (long) image->rowStart[y+z*image->ysize], SEEK_SET); + fread(image->tmp, 1, (unsigned int)image->rowSize[y+z*image->ysize], + image->file); + + iPtr = image->tmp; + oPtr = buf; + for (;;) { + pixel = *iPtr++; + count = (int)(pixel & 0x7F); + if (!count) { + return; + } + if (pixel & 0x80) { + while (count--) { + *oPtr++ = *iPtr++; + } + } else { + pixel = *iPtr++; + while (count--) { + *oPtr++ = pixel; + } + } + } + } else { + fseek(image->file, 512+(y*image->xsize)+(z*image->xsize*image->ysize), + SEEK_SET); + fread(buf, 1, image->xsize, image->file); + } +} + +GLubyte * +read_alpha_texture(char *name, int *width, int *height) +{ + unsigned char *base, *lptr; + ImageRec *image; + int y; + + image = ImageOpen(name); + if(!image) { + return NULL; + } + + (*width)=image->xsize; + (*height)=image->ysize; + if (image->zsize != 1) { + ImageClose(image); + return NULL; + } + + base = (unsigned char *)malloc(image->xsize*image->ysize*sizeof(unsigned char)); + lptr = base; + for(y=0; yysize; y++) { + ImageGetRow(image,lptr,y,0); + lptr += image->xsize; + } + ImageClose(image); + + return (unsigned char *) base; +} + +GLubyte * +read_rgb_texture(char *name, int *width, int *height) +{ + unsigned char *base, *ptr; + unsigned char *rbuf, *gbuf, *bbuf, *abuf; + ImageRec *image; + int y; + + image = ImageOpen(name); + + if(!image) + return NULL; + (*width)=image->xsize; + (*height)=image->ysize; + if (image->zsize != 3 && image->zsize != 4) { + ImageClose(image); + return NULL; + } + + base = (unsigned char*)malloc(image->xsize*image->ysize*sizeof(unsigned int)*3); + rbuf = (unsigned char *)malloc(image->xsize*sizeof(unsigned char)); + gbuf = (unsigned char *)malloc(image->xsize*sizeof(unsigned char)); + bbuf = (unsigned char *)malloc(image->xsize*sizeof(unsigned char)); + abuf = (unsigned char *)malloc(image->xsize*sizeof(unsigned char)); + if(!base || !rbuf || !gbuf || !bbuf || !abuf) { + if (base) free(base); + if (rbuf) free(rbuf); + if (gbuf) free(gbuf); + if (bbuf) free(bbuf); + if (abuf) free(abuf); + return NULL; + } + ptr = base; + for(y=0; yysize; y++) { + if(image->zsize == 4) { + ImageGetRow(image,rbuf,y,0); + ImageGetRow(image,gbuf,y,1); + ImageGetRow(image,bbuf,y,2); + ImageGetRow(image,abuf,y,3); /* Discard. */ + rgbtorgb(rbuf,gbuf,bbuf,ptr,image->xsize); + ptr += (image->xsize * 3); + } else { + ImageGetRow(image,rbuf,y,0); + ImageGetRow(image,gbuf,y,1); + ImageGetRow(image,bbuf,y,2); + rgbtorgb(rbuf,gbuf,bbuf,ptr,image->xsize); + ptr += (image->xsize * 3); + } + } + ImageClose(image); + free(rbuf); + free(gbuf); + free(bbuf); + free(abuf); + + return (GLubyte *) base; +} diff --git a/Scenery/texload.h b/Scenery/texload.h new file mode 100644 index 000000000..2c9335741 --- /dev/null +++ b/Scenery/texload.h @@ -0,0 +1,19 @@ + +/* Copyright (c) Mark J. Kilgard, 1997. */ + +/* This program is freely distributable without licensing fees + and is provided without guarantee or warrantee expressed or + implied. This program is -not- in the public domain. */ + + +#ifndef _TEXLOAD_H +#define _TEXLOAD_H + + +#include + +extern GLubyte *read_alpha_texture(char *name, int *width, int *height); +extern GLubyte * read_rgb_texture(char *name, int *width, int *height); + + +#endif /* _TEXLOAD_H */ -- 2.39.2