summaryrefslogtreecommitdiff
path: root/progs/util/readtex.c
blob: 3922998fd5bc4040ede90734c687e3e7cbc2e985 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
/* readtex.c */

/*
 * Read an SGI .rgb image file and generate a mipmap texture set.
 * Much of this code was borrowed from SGI's tk OpenGL toolkit.
 */



#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <stdlib.h> 
#include <string.h>
#include "readtex.h"


#ifndef SEEK_SET
#  define SEEK_SET 0
#endif


/*
** RGB Image Structure
*/

typedef struct _TK_RGBImageRec {
   GLint sizeX, sizeY;
   GLint components;
   unsigned char *data;
} TK_RGBImageRec;



/******************************************************************************/

typedef struct _rawImageRec {
    unsigned short imagic;
    unsigned short type;
    unsigned short dim;
    unsigned short sizeX, sizeY, sizeZ;
    unsigned long min, max;
    unsigned long wasteBytes;
    char name[80];
    unsigned long colorMap;
    FILE *file;
    unsigned char *tmp, *tmpR, *tmpG, *tmpB, *tmpA;
    unsigned long rleEnd;
    GLuint *rowStart;
    GLint *rowSize;
} rawImageRec;

/******************************************************************************/

static void ConvertShort(unsigned short *array, long length)
{
   unsigned long b1, b2;
   unsigned char *ptr;

   ptr = (unsigned char *)array;
   while (length--) {
      b1 = *ptr++;
      b2 = *ptr++;
      *array++ = (unsigned short) ((b1 << 8) | (b2));
   }
}

static void ConvertLong(GLuint *array, long length)
{
   unsigned long 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 rawImageRec *RawImageOpen(const char *fileName)
{
   union {
      int testWord;
      char testByte[4];
   } endianTest;
   rawImageRec *raw;
   GLenum swapFlag;
   int x;

   endianTest.testWord = 1;
   if (endianTest.testByte[0] == 1) {
      swapFlag = GL_TRUE;
   } else {
      swapFlag = GL_FALSE;
   }

   raw = (rawImageRec *)calloc(1, sizeof(rawImageRec));
   if (raw == NULL) {
      fprintf(stderr, "Out of memory!\n");
      return NULL;
   }
   raw->file = fopen(fileName, "rb");
   if (raw->file == NULL) {
      const char *baseName = strrchr(fileName, '/');
      if(baseName)
         raw->file = fopen(baseName + 1, "rb");
      if(raw->file == NULL) {
         perror(fileName);
         free(raw);
         return NULL;
      }
   }

   fread(raw, 1, 12, raw->file);

   if (swapFlag) {
      ConvertShort(&raw->imagic, 6);
   }

   raw->tmp = (unsigned char *)malloc(raw->sizeX*256);
   raw->tmpR = (unsigned char *)malloc(raw->sizeX*256);
   raw->tmpG = (unsigned char *)malloc(raw->sizeX*256);
   raw->tmpB = (unsigned char *)malloc(raw->sizeX*256);
   if (raw->sizeZ==4) {
      raw->tmpA = (unsigned char *)malloc(raw->sizeX*256);
   }
   if (raw->tmp == NULL || raw->tmpR == NULL || raw->tmpG == NULL ||
       raw->tmpB == NULL) {
      fprintf(stderr, "Out of memory!\n");
      return NULL;
   }

   if ((raw->type & 0xFF00) == 0x0100) {
      x = raw->sizeY * raw->sizeZ * sizeof(GLuint);
      raw->rowStart = (GLuint *)malloc(x);
      raw->rowSize = (GLint *)malloc(x);
      if (raw->rowStart == NULL || raw->rowSize == NULL) {
         fprintf(stderr, "Out of memory!\n");
         return NULL;
      }
      raw->rleEnd = 512 + (2 * x);
      fseek(raw->file, 512, SEEK_SET);
      fread(raw->rowStart, 1, x, raw->file);
      fread(raw->rowSize, 1, x, raw->file);
      if (swapFlag) {
         ConvertLong(raw->rowStart, (long) (x/sizeof(GLuint)));
         ConvertLong((GLuint *)raw->rowSize, (long) (x/sizeof(GLint)));
      }
   }
   return raw;
}

static void RawImageClose(rawImageRec *raw)
{
   fclose(raw->file);
   free(raw->tmp);
   free(raw->tmpR);
   free(raw->tmpG);
   free(raw->tmpB);
   if (raw->rowStart)
      free(raw->rowStart);
   if (raw->rowSize)
      free(raw->rowSize);
   if (raw->sizeZ>3) {
      free(raw->tmpA);
   }
   free(raw);
}

static void RawImageGetRow(rawImageRec *raw, unsigned char *buf, int y, int z)
{
   unsigned char *iPtr, *oPtr, pixel;
   int count, done = 0;

   if ((raw->type & 0xFF00) == 0x0100) {
      fseek(raw->file, (long) raw->rowStart[y+z*raw->sizeY], SEEK_SET);
      fread(raw->tmp, 1, (unsigned int)raw->rowSize[y+z*raw->sizeY],
            raw->file);
      
      iPtr = raw->tmp;
      oPtr = buf;
      while (!done) {
         pixel = *iPtr++;
         count = (int)(pixel & 0x7F);
         if (!count) {
			 done = 1;
            return;
         }
         if (pixel & 0x80) {
            while (count--) {
               *oPtr++ = *iPtr++;
            }
         } else {
            pixel = *iPtr++;
            while (count--) {
               *oPtr++ = pixel;
            }
         }
      }
   } else {
      fseek(raw->file, 512+(y*raw->sizeX)+(z*raw->sizeX*raw->sizeY),
            SEEK_SET);
      fread(buf, 1, raw->sizeX, raw->file);
   }
}


static void RawImageGetData(rawImageRec *raw, TK_RGBImageRec *final)
{
   unsigned char *ptr;
   int i, j;

   final->data = (unsigned char *)malloc((raw->sizeX+1)*(raw->sizeY+1)*4);
   if (final->data == NULL) {
      fprintf(stderr, "Out of memory!\n");
   }

   ptr = final->data;
   for (i = 0; i < (int)(raw->sizeY); i++) {
      RawImageGetRow(raw, raw->tmpR, i, 0);
      RawImageGetRow(raw, raw->tmpG, i, 1);
      RawImageGetRow(raw, raw->tmpB, i, 2);
      if (raw->sizeZ>3) {
         RawImageGetRow(raw, raw->tmpA, i, 3);
      }
      for (j = 0; j < (int)(raw->sizeX); j++) {
         *ptr++ = *(raw->tmpR + j);
         *ptr++ = *(raw->tmpG + j);
         *ptr++ = *(raw->tmpB + j);
         if (raw->sizeZ>3) {
            *ptr++ = *(raw->tmpA + j);
         }
      }
   }
}


static TK_RGBImageRec *tkRGBImageLoad(const char *fileName)
{
   rawImageRec *raw;
   TK_RGBImageRec *final;

   raw = RawImageOpen(fileName);
   if (!raw) {
      fprintf(stderr, "File not found\n");
      return NULL;
   }
   final = (TK_RGBImageRec *)malloc(sizeof(TK_RGBImageRec));
   if (final == NULL) {
      fprintf(stderr, "Out of memory!\n");
      RawImageClose(raw);
      return NULL;
   }
   final->sizeX = raw->sizeX;
   final->sizeY = raw->sizeY;
   final->components = raw->sizeZ;
   RawImageGetData(raw, final);
   RawImageClose(raw);
   return final;
}


static void FreeImage( TK_RGBImageRec *image )
{
   free(image->data);
   free(image);
}


/*
 * Load an SGI .rgb file and generate a set of 2-D mipmaps from it.
 * Input:  imageFile - name of .rgb to read
 *         intFormat - internal texture format to use, or number of components
 * Return:  GL_TRUE if success, GL_FALSE if error.
 */
GLboolean LoadRGBMipmaps( const char *imageFile, GLint intFormat )
{
   GLint w, h;
   return LoadRGBMipmaps2( imageFile, GL_TEXTURE_2D, intFormat, &w, &h );
}



GLboolean LoadRGBMipmaps2( const char *imageFile, GLenum target,
                           GLint intFormat, GLint *width, GLint *height )
{
   GLint error;
   GLenum format;
   TK_RGBImageRec *image;

   image = tkRGBImageLoad( imageFile );
   if (!image) {
      return GL_FALSE;
   }

   if (image->components==3) {
      format = GL_RGB;
   }
   else if (image->components==4) {
      format = GL_RGBA;
   }
   else {
      /* not implemented */
      fprintf(stderr,
              "Error in LoadRGBMipmaps %d-component images not implemented\n",
              image->components );
      FreeImage(image);
      return GL_FALSE;
   }

   error = gluBuild2DMipmaps( target,
                              intFormat,
                              image->sizeX, image->sizeY,
                              format,
                              GL_UNSIGNED_BYTE,
                              image->data );

   *width = image->sizeX;
   *height = image->sizeY;

   FreeImage(image);

   return error ? GL_FALSE : GL_TRUE;
}



/*
 * Load an SGI .rgb file and return a pointer to the image data.
 * Input:  imageFile - name of .rgb to read
 * Output:  width - width of image
 *          height - height of image
 *          format - format of image (GL_RGB or GL_RGBA)
 * Return:  pointer to image data or NULL if error
 */
GLubyte *LoadRGBImage( const char *imageFile, GLint *width, GLint *height,
                       GLenum *format )
{
   TK_RGBImageRec *image;
   GLint bytes;
   GLubyte *buffer;

   image = tkRGBImageLoad( imageFile );
   if (!image) {
      return NULL;
   }

   if (image->components==3) {
      *format = GL_RGB;
   }
   else if (image->components==4) {
      *format = GL_RGBA;
   }
   else {
      /* not implemented */
      fprintf(stderr,
              "Error in LoadRGBImage %d-component images not implemented\n",
              image->components );
      FreeImage(image);
      return NULL;
   }

   *width = image->sizeX;
   *height = image->sizeY;

   bytes = image->sizeX * image->sizeY * image->components;
   buffer = (GLubyte *) malloc(bytes);
   if (!buffer) {
      FreeImage(image);
      return NULL;
   }

   memcpy( (void *) buffer, (void *) image->data, bytes );

   FreeImage(image);

   return buffer;
}

#define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )


static void ConvertRGBtoYUV(GLint w, GLint h, GLint texel_bytes,
			    const GLubyte *src,
                            GLushort *dest)
{
   GLint i, j;

   for (i = 0; i < h; i++) {
      for (j = 0; j < w; j++) {
         const GLfloat r = (src[0]) / 255.0;
         const GLfloat g = (src[1]) / 255.0;
         const GLfloat b = (src[2]) / 255.0;
         GLfloat y, cr, cb;
         GLint iy, icr, icb;

         y  = r * 65.481 + g * 128.553 + b * 24.966 + 16;
         cb = r * -37.797 + g * -74.203 + b * 112.0 + 128;
         cr = r * 112.0 + g * -93.786 + b * -18.214 + 128;
         /*printf("%f %f %f -> %f %f %f\n", r, g, b, y, cb, cr);*/
         iy  = (GLint) CLAMP(y,  0, 254);
         icb = (GLint) CLAMP(cb, 0, 254);
         icr = (GLint) CLAMP(cr, 0, 254);

         if (j & 1) {
            /* odd */
            *dest = (iy << 8) | icr;
         }
         else {
            /* even */
            *dest = (iy << 8) | icb;
         }
         dest++;
	 src += texel_bytes;
      }
   }
}


/*
 * Load an SGI .rgb file and return a pointer to the image data, converted
 * to 422 yuv.
 *
 * Input:  imageFile - name of .rgb to read
 * Output:  width - width of image
 *          height - height of image
 * Return:  pointer to image data or NULL if error
 */
GLushort *LoadYUVImage( const char *imageFile, GLint *width, GLint *height )
{
   TK_RGBImageRec *image;
   GLushort *buffer;

   image = tkRGBImageLoad( imageFile );
   if (!image) {
      return NULL;
   }

   if (image->components != 3 && image->components !=4 ) {
      /* not implemented */
      fprintf(stderr,
              "Error in LoadYUVImage %d-component images not implemented\n",
              image->components );
      FreeImage(image);
      return NULL;
   }

   *width = image->sizeX;
   *height = image->sizeY;

   buffer = (GLushort *) malloc( image->sizeX * image->sizeY * 2 );

   if (buffer)
      ConvertRGBtoYUV( image->sizeX, 
		       image->sizeY,
		       image->components,
		       image->data, 
		       buffer );


   FreeImage(image);
   return buffer;
}