progs/tests/arraytexture.c

   1 /*
   2  * (C) Copyright IBM Corporation 2007
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * IBM AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file arraytexture.c
  27  *
  28  *
  29  * \author Ian Romanick <idr@us.ibm.com>
  30  */
  31
  32 #include <assert.h>
  33 #include <stdlib.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <math.h>
  37 #include <GL/glew.h>
  38 #include <GL/glut.h>
  39
  40 #if !defined(GL_EXT_texture_array) && !defined(GL_MESA_texture_array)
  41 # error "This demo requires enums for either GL_EXT_texture_array or GL_MESA_texture_array to build."
  42 #endif
  43
  44 #include "readtex.h"
  45
  46 #define GL_CHECK_ERROR() \
  47     do { \
  48        GLenum err = glGetError(); \
  49        if (err) { \
  50           printf("%s:%u: %s (0x%04x)\n", __FILE__, __LINE__, \
  51                     gluErrorString(err), err); \
  52        } \
  53     } while (0)
  54
  55 static const char *const textures[] = {
  56    "../images/girl.rgb",
  57    "../images/girl2.rgb",
  58    "../images/arch.rgb",
  59    "../images/s128.rgb",
  60
  61    "../images/tree3.rgb",
  62    "../images/bw.rgb",
  63    "../images/reflect.rgb",
  64    "../images/wrs_logo.rgb",
  65    NULL
  66 };
  67
  68 static const char frag_prog[] =
  69   "!!ARBfp1.0\n"
  70   "OPTION MESA_texture_array;\n"
  71   "TEX    result.color, fragment.texcoord[0], texture[0], ARRAY2D;\n"
  72   "END\n";
  73
  74 static GLfloat Xrot = 0, Yrot = -30, Zrot = 0;
  75 static GLfloat texZ = 0.0;
  76 static GLfloat texZ_dir = 0.01;
  77 static GLint num_layers;
  78
  79
  80 static void
  81 PrintString(const char *s)
  82 {
  83    while (*s) {
  84       glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
  85       s++;
  86    }
  87 }
  88
  89
  90 static void Idle(void)
  91 {
  92    static int lastTime = 0;
  93    int t = glutGet(GLUT_ELAPSED_TIME);
  94
  95    if (lastTime == 0)
  96       lastTime = t;
  97    else if (t - lastTime < 10)
  98       return;
  99
 100    lastTime = t;
 101
 102    texZ += texZ_dir;
 103    if ((texZ < 0.0) || ((GLint) texZ > num_layers)) {
 104       texZ_dir = -texZ_dir;
 105    }
 106
 107    glutPostRedisplay();
 108 }
 109
 110
 111 static void Display(void)
 112 {
 113    char str[100];
 114
 115    glClear(GL_COLOR_BUFFER_BIT);
 116
 117    glMatrixMode(GL_PROJECTION);
 118    glLoadIdentity();
 119    glOrtho(-1, 1, -1, 1, -1, 1);
 120    glMatrixMode(GL_MODELVIEW);
 121    glLoadIdentity();
 122
 123    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 0);
 124    glColor3f(1,1,1);
 125    glRasterPos3f(-0.9, -0.9, 0.0);
 126    sprintf(str, "Texture Z coordinate = %4.1f", texZ);
 127    PrintString(str);
 128
 129    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 1);
 130    GL_CHECK_ERROR();
 131    glEnable(GL_TEXTURE_2D_ARRAY_EXT);
 132    GL_CHECK_ERROR();
 133
 134    glMatrixMode(GL_PROJECTION);
 135    glLoadIdentity();
 136    glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
 137    glMatrixMode(GL_MODELVIEW);
 138    glLoadIdentity();
 139    glTranslatef(0.0, 0.0, -8.0);
 140
 141    glPushMatrix();
 142    glRotatef(Xrot, 1, 0, 0);
 143    glRotatef(Yrot, 0, 1, 0);
 144    glRotatef(Zrot, 0, 0, 1);
 145
 146    glBegin(GL_QUADS);
 147    glTexCoord3f(0.0, 0.0, texZ);  glVertex2f(-1.0, -1.0);
 148    glTexCoord3f(2.0, 0.0, texZ);  glVertex2f(1.0, -1.0);
 149    glTexCoord3f(2.0, 2.0, texZ);  glVertex2f(1.0,  1.0);
 150    glTexCoord3f(0.0, 2.0, texZ);  glVertex2f(-1.0,  1.0);
 151    glEnd();
 152
 153    glPopMatrix();
 154
 155    glDisable(GL_TEXTURE_2D_ARRAY_EXT);
 156    GL_CHECK_ERROR();
 157    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 0);
 158    GL_CHECK_ERROR();
 159
 160    glutSwapBuffers();
 161 }
 162
 163
 164 static void Reshape(int width, int height)
 165 {
 166    glViewport(0, 0, width, height);
 167 }
 168
 169
 170 static void Key(unsigned char key, int x, int y)
 171 {
 172    (void) x;
 173    (void) y;
 174    switch (key) {
 175       case 27:
 176          exit(0);
 177          break;
 178    }
 179    glutPostRedisplay();
 180 }
 181
 182
 183 static void SpecialKey(int key, int x, int y)
 184 {
 185    const GLfloat step = 3.0;
 186    (void) x;
 187    (void) y;
 188    switch (key) {
 189       case GLUT_KEY_UP:
 190          Xrot -= step;
 191          break;
 192       case GLUT_KEY_DOWN:
 193          Xrot += step;
 194          break;
 195       case GLUT_KEY_LEFT:
 196          Yrot -= step;
 197          break;
 198       case GLUT_KEY_RIGHT:
 199          Yrot += step;
 200          break;
 201    }
 202    glutPostRedisplay();
 203 }
 204
 205
 206 static int FindLine(const char *program, int position)
 207 {
 208    int i, line = 1;
 209    for (i = 0; i < position; i++) {
 210       if (program[i] == '\n')
 211           line++;
 212    }
 213    return line;
 214 }
 215
 216
 217 static void
 218 compile_fragment_program(GLuint id, const char *prog)
 219 {
 220    int errorPos;
 221    int err;
 222
 223    err = glGetError();
 224    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, id);
 225    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 226                      strlen(prog), (const GLubyte *) prog);
 227
 228    glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorPos);
 229    err = glGetError();
 230    if (err != GL_NO_ERROR || errorPos != -1) {
 231       int l = FindLine(prog, errorPos);
 232
 233       printf("Fragment Program Error (err=%d, pos=%d line=%d): %s\n",
 234              err, errorPos, l,
 235              (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 236       exit(0);
 237    }
 238 }
 239
 240
 241 static void require_extension(const char *ext)
 242 {
 243    if (!glutExtensionSupported(ext)) {
 244       printf("Sorry, %s not supported by this renderer.\n", ext);
 245       exit(1);
 246    }
 247 }
 248
 249
 250 static void Init(void)
 251 {
 252    const char *const ver_string = (const char *const) glGetString(GL_VERSION);
 253    unsigned i;
 254
 255    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 256    printf("GL_VERSION = %s\n", ver_string);
 257
 258    require_extension("GL_ARB_fragment_program");
 259    require_extension("GL_MESA_texture_array");
 260    require_extension("GL_SGIS_generate_mipmap");
 261
 262    for (num_layers = 0; textures[num_layers] != NULL; num_layers++)
 263       /* empty */ ;
 264
 265    glBindTexture(GL_TEXTURE_2D_ARRAY_EXT, 1);
 266    glTexImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0, GL_RGB8,
 267                 256, 256, num_layers, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 268    GL_CHECK_ERROR();
 269
 270    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_GENERATE_MIPMAP_SGIS,
 271                    GL_TRUE);
 272
 273    for (i = 0; textures[i] != NULL; i++) {
 274       GLint width, height;
 275       GLenum format;
 276
 277       GLubyte *image = LoadRGBImage(textures[i], &width, &height, &format);
 278       if (!image) {
 279          printf("Error: could not load texture image %s\n", textures[i]);
 280          exit(1);
 281       }
 282
 283       /* resize to 256 x 256 */
 284       if (width != 256 || height != 256) {
 285          GLubyte *newImage = malloc(256 * 256 * 4);
 286          gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image,
 287                        256, 256, GL_UNSIGNED_BYTE, newImage);
 288          free(image);
 289          image = newImage;
 290       }
 291
 292       glTexSubImage3D(GL_TEXTURE_2D_ARRAY_EXT, 0,
 293                       0, 0, i, 256, 256, 1,
 294                       format, GL_UNSIGNED_BYTE, image);
 295       free(image);
 296    }
 297    GL_CHECK_ERROR();
 298
 299    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_S, GL_REPEAT);
 300    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_T, GL_REPEAT);
 301    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 302
 303    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
 304    GL_CHECK_ERROR();
 305    glTexParameteri(GL_TEXTURE_2D_ARRAY_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 306    GL_CHECK_ERROR();
 307
 308    compile_fragment_program(1, frag_prog);
 309    GL_CHECK_ERROR();
 310 }
 311
 312
 313 int main(int argc, char *argv[])
 314 {
 315    glutInit(&argc, argv);
 316    glutInitWindowPosition(0, 0);
 317    glutInitWindowSize(350, 350);
 318    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
 319    glutCreateWindow("Array texture test");
 320    glewInit();
 321    glutReshapeFunc(Reshape);
 322    glutKeyboardFunc(Key);
 323    glutSpecialFunc(SpecialKey);
 324    glutDisplayFunc(Display);
 325    glutIdleFunc(Idle);
 326    Init();
 327    glutMainLoop();
 328    return 0;
 329 }