summaryrefslogtreecommitdiff
path: root/progs/tests/arraytexture.c
blob: 94adf478d90042120610d933c4a23c570e082394 (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
/*
 * (C) Copyright IBM Corporation 2007
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

/**
 * \file arraytexture.c
 *
 *
 * \author Ian Romanick <idr@us.ibm.com>
 */

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <GL/glew.h>
#include <GL/glut.h>

#if !defined(GL_EXT_texture_array) && !defined(GL_MESA_texture_array)
# error "This demo requires enums for either GL_EXT_texture_array or GL_MESA_texture_array to build."
#endif

#include "readtex.h"

#define GL_CHECK_ERROR() \
    do { \
       GLenum err = glGetError(); \
       if (err) { \
          printf("%s:%u: %s (0x%04x)\n", __FILE__, __LINE__, \
                    gluErrorString(err), err); \
       } \
    } while (0)

static const char *const textures[] = {
   "../images/girl.rgb",
   "../images/girl2.rgb",
   "../images/arch.rgb",
   "../images/s128.rgb",

   "../images/tree3.rgb",
   "../images/bw.rgb",
   "../images/reflect.rgb",
   "../images/wrs_logo.rgb",
   NULL
};

static const char frag_prog[] =
  "!!ARBfp1.0\n"
  "OPTION MESA_texture_array;\n"
  "TEX    result.color, fragment.texcoord[0], texture[0], ARRAY2D;\n"
  "END\n";

static GLfloat Xrot = 0, Yrot = -30, Zrot = 0;
static GLfloat texZ = 0.0;
static GLfloat texZ_dir = 0.01;
static GLint num_layers;


static void
PrintString(const char *s)
{
   while (*s) {
      glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
      s++;
   }
}


static void Idle(void)
{
   static int lastTime = 0;
   int t = glutGet(GLUT_ELAPSED_TIME);

   if (lastTime == 0)
      lastTime = t;
   else if (t - lastTime < 10)
      return;

   lastTime = t;

   texZ += texZ_dir;
   if ((texZ < 0.0) || ((GLint) texZ > num_layers)) {
      texZ_dir = -texZ_dir;
   }

   glutPostRedisplay();
}


static void Display(void)
{
   char str[100];

   glClear(GL_COLOR_BUFFER_BIT);

   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(-1, 1, -1, 1, -1, 1);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();

   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 0);
   glColor3f(1,1,1);
   glRasterPos3f(-0.9, -0.9, 0.0);
   sprintf(str, "Texture Z coordinate = %4.1f", texZ);
   PrintString(str);

   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 1);
   GL_CHECK_ERROR();
   glEnable(GL_TEXTURE_2D_ARRAY_EXT);
   GL_CHECK_ERROR();

   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   glTranslatef(0.0, 0.0, -8.0);

   glPushMatrix();
   glRotatef(Xrot, 1, 0, 0);
   glRotatef(Yrot, 0, 1, 0);
   glRotatef(Zrot, 0, 0, 1);

   glBegin(GL_QUADS);
   glTexCoord3f(0.0, 0.0, texZ);  glVertex2f(-1.0, -1.0);
   glTexCoord3f(2.0, 0.0, texZ);  glVertex2f(1.0, -1.0);
   glTexCoord3f(2.0, 2.0, texZ);  glVertex2f(1.0,  1.0);
   glTexCoord3f(0.0, 2.0, texZ);  glVertex2f(-1.0,  1.0);
   glEnd();

   glPopMatrix();

   glDisable(GL_TEXTURE_2D_ARRAY_EXT);
   GL_CHECK_ERROR();
   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 0);
   GL_CHECK_ERROR();

   glutSwapBuffers();
}


static void Reshape(int width, int height)
{
   glViewport(0, 0, width, height);
}


static void Key(unsigned char key, int x, int y)
{
   (void) x;
   (void) y;
   switch (key) {
      case 27:
         exit(0);
         break;
   }
   glutPostRedisplay();
}


static void SpecialKey(int key, int x, int y)
{
   const GLfloat step = 3.0;
   (void) x;
   (void) y;
   switch (key) {
      case GLUT_KEY_UP:
         Xrot -= step;
         break;
      case GLUT_KEY_DOWN:
         Xrot += step;
         break;
      case GLUT_KEY_LEFT:
         Yrot -= step;
         break;
      case GLUT_KEY_RIGHT:
         Yrot += step;
         break;
   }
   glutPostRedisplay();
}


static int FindLine(const char *program, int position)
{
   int i, line = 1;
   for (i = 0; i < position; i++) {
      if (program[i] == '\n')
          line++;
   }
   return line;
}


static void
compile_fragment_program(GLuint id, const char *prog)
{
   int errorPos;
   int err;

   err = glGetError();
   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, id);
   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
                     strlen(prog), (const GLubyte *) prog);

   glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
   err = glGetError();
   if (err != GL_NO_ERROR || errorPos != -1) {
      int l = FindLine(prog, errorPos);

      printf("Fragment Program Error (err=%d, pos=%d line=%d): %s\n",
             err, errorPos, l,
             (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
      exit(0);
   }
}


static void require_extension(const char *ext)
{
   if (!glutExtensionSupported(ext)) {
      printf("Sorry, %s not supported by this renderer.\n", ext);
      exit(1);
   }
}


static void Init(void)
{
   const char *const ver_string = (const char *) glGetString(GL_VERSION);
   unsigned i;

   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
   printf("GL_VERSION = %s\n", ver_string);

   require_extension("GL_ARB_fragment_program");
   require_extension("GL_MESA_texture_array");
   require_extension("GL_SGIS_generate_mipmap");

   for (num_layers = 0; textures[num_layers] != NULL; num_layers++)
      /* empty */ ;

   glBindTexture(GL_TEXTURE_2D_ARRAY_EXT, 1);
   glTexImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0, GL_RGB8,
                256, 256, num_layers, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
   GL_CHECK_ERROR();

   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_GENERATE_MIPMAP_SGIS, 
                   GL_TRUE);

   for (i = 0; textures[i] != NULL; i++) {
      GLint width, height;
      GLenum format;

      GLubyte *image = LoadRGBImage(textures[i], &width, &height, &format);
      if (!image) {
         printf("Error: could not load texture image %s\n", textures[i]);
         exit(1);
      }

      /* resize to 256 x 256 */
      if (width != 256 || height != 256) {
         GLubyte *newImage = malloc(256 * 256 * 4);
         gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
                       256, 256, GL_UNSIGNED_BYTE, newImage);
         free(image);
         image = newImage;
      }

      glTexSubImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0,
                      0, 0, i, 256, 256, 1,
                      format, GL_UNSIGNED_BYTE, image);
      free(image);
   }
   GL_CHECK_ERROR();

   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_S, GL_REPEAT);
   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_T, GL_REPEAT);
   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
   GL_CHECK_ERROR();
   glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   GL_CHECK_ERROR();

   compile_fragment_program(1, frag_prog);
   GL_CHECK_ERROR();
}


int main(int argc, char *argv[])
{
   glutInit(&argc, argv);
   glutInitWindowPosition(0, 0);
   glutInitWindowSize(350, 350);
   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
   glutCreateWindow("Array texture test");
   glewInit();
   glutReshapeFunc(Reshape);
   glutKeyboardFunc(Key);
   glutSpecialFunc(SpecialKey);
   glutDisplayFunc(Display);
   glutIdleFunc(Idle);
   Init();
   glutMainLoop();
   return 0;
}