progs/tests/bufferobj.c

   1 /*
   2  * Test GL_ARB_vertex_buffer_object
   3  *
   4  * Brian Paul
   5  * 16 Sep 2003
   6  */
   7
   8
   9 #define GL_GLEXT_PROTOTYPES
  10 #include <assert.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <math.h>
  14 #include <GL/glut.h>
  15
  16 #define NUM_OBJECTS 10
  17
  18 struct object
  19 {
  20    GLuint BufferID;
  21    GLuint ElementsBufferID;
  22    GLuint NumVerts;
  23    GLuint VertexOffset;
  24    GLuint ColorOffset;
  25    GLuint VertexStride;
  26    GLuint ColorStride;
  27    GLuint NumElements;
  28 };
  29
  30 static struct object Objects[NUM_OBJECTS];
  31 static GLuint NumObjects;
  32
  33 static GLuint Win;
  34
  35 static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
  36 static GLboolean Anim = GL_TRUE;
  37
  38
  39 static void CheckError(int line)
  40 {
  41    GLenum err = glGetError();
  42    if (err) {
  43       printf("GL Error 0x%x at line %d\n", (int) err, line);
  44    }
  45 }
  46
  47
  48 static void DrawObject( const struct object *obj )
  49 {
  50    glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
  51    glVertexPointer(3, GL_FLOAT, obj->VertexStride, (void *) obj->VertexOffset);
  52    glEnable(GL_VERTEX_ARRAY);
  53
  54    /* test push/pop attrib */
  55    /* XXX this leads to a segfault with NVIDIA's 53.36 driver */
  56 #if 0
  57    if (1)
  58    {
  59       glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
  60       /*glVertexPointer(3, GL_FLOAT, 0, (void *) (obj->VertexOffset + 10000));*/
  61       glBindBufferARB(GL_ARRAY_BUFFER_ARB, 999999);
  62       glPopClientAttrib();
  63    }
  64 #endif
  65    glColorPointer(3, GL_FLOAT, obj->ColorStride, (void *) obj->ColorOffset);
  66    glEnable(GL_COLOR_ARRAY);
  67
  68    if (obj->NumElements > 0) {
  69       /* indexed arrays */
  70       glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
  71       glDrawElements(GL_LINE_LOOP, obj->NumElements, GL_UNSIGNED_INT, NULL);
  72    }
  73    else {
  74       /* non-indexed arrays */
  75       glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 0);
  76       glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
  77    }
  78 }
  79
  80
  81 static void Idle( void )
  82 {
  83    Zrot = 0.05 * glutGet(GLUT_ELAPSED_TIME);
  84    glutPostRedisplay();
  85 }
  86
  87
  88 static void Display( void )
  89 {
  90    int i;
  91
  92    glClear( GL_COLOR_BUFFER_BIT );
  93
  94    for (i = 0; i < NumObjects; i++) {
  95       float x = 5.0 * ((float) i / (NumObjects-1) - 0.5);
  96       glPushMatrix();
  97       glTranslatef(x, 0, 0);
  98       glRotatef(Xrot, 1, 0, 0);
  99       glRotatef(Yrot, 0, 1, 0);
 100       glRotatef(Zrot, 0, 0, 1);
 101
 102       DrawObject(Objects + i);
 103
 104       glPopMatrix();
 105    }
 106
 107    CheckError(__LINE__);
 108    glutSwapBuffers();
 109 }
 110
 111
 112 static void Reshape( int width, int height )
 113 {
 114    float ar = (float) width / (float) height;
 115    glViewport( 0, 0, width, height );
 116    glMatrixMode( GL_PROJECTION );
 117    glLoadIdentity();
 118    glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
 119    glMatrixMode( GL_MODELVIEW );
 120    glLoadIdentity();
 121    glTranslatef( 0.0, 0.0, -15.0 );
 122 }
 123
 124
 125 static void FreeBuffers(void)
 126 {
 127    int i;
 128    for (i = 0; i < NUM_OBJECTS; i++)
 129       glDeleteBuffersARB(1, &Objects[i].BufferID);
 130 }
 131
 132
 133 static void Key( unsigned char key, int x, int y )
 134 {
 135    const GLfloat step = 3.0;
 136    (void) x;
 137    (void) y;
 138    switch (key) {
 139       case 'a':
 140          Anim = !Anim;
 141          if (Anim)
 142             glutIdleFunc(Idle);
 143          else
 144             glutIdleFunc(NULL);
 145          break;
 146       case 'z':
 147          Zrot -= step;
 148          break;
 149       case 'Z':
 150          Zrot += step;
 151          break;
 152       case 27:
 153          FreeBuffers();
 154          glutDestroyWindow(Win);
 155          exit(0);
 156          break;
 157    }
 158    glutPostRedisplay();
 159 }
 160
 161
 162 static void SpecialKey( int key, int x, int y )
 163 {
 164    const GLfloat step = 3.0;
 165    (void) x;
 166    (void) y;
 167    switch (key) {
 168       case GLUT_KEY_UP:
 169          Xrot -= step;
 170          break;
 171       case GLUT_KEY_DOWN:
 172          Xrot += step;
 173          break;
 174       case GLUT_KEY_LEFT:
 175          Yrot -= step;
 176          break;
 177       case GLUT_KEY_RIGHT:
 178          Yrot += step;
 179          break;
 180    }
 181    glutPostRedisplay();
 182 }
 183
 184
 185
 186 static void MakeObject1(struct object *obj)
 187 {
 188    GLfloat *v, *c;
 189    void *p;
 190    int i;
 191    GLubyte buffer[500];
 192
 193    for (i = 0; i < 500; i++)
 194       buffer[i] = i & 0xff;
 195
 196    obj->BufferID = 0;
 197    glGenBuffersARB(1, &obj->BufferID);
 198    assert(obj->BufferID != 0);
 199    glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
 200    glBufferDataARB(GL_ARRAY_BUFFER_ARB, 500, buffer, GL_STATIC_DRAW_ARB);
 201
 202    for (i = 0; i < 500; i++)
 203       buffer[i] = 0;
 204
 205    glGetBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, 500, buffer);
 206
 207    for (i = 0; i < 500; i++)
 208       assert(buffer[i] == (i & 0xff));
 209
 210    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAPPED_ARB, &i);
 211    assert(!i);
 212
 213    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_USAGE_ARB, &i);
 214
 215    v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
 216
 217    /* do some sanity tests */
 218    glGetBufferPointervARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAP_POINTER_ARB, &p);
 219    assert(p == v);
 220
 221    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_SIZE_ARB, &i);
 222    assert(i == 500);
 223
 224    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_USAGE_ARB, &i);
 225    assert(i == GL_STATIC_DRAW_ARB);
 226
 227    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_ACCESS_ARB, &i);
 228    assert(i == GL_WRITE_ONLY_ARB);
 229
 230    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAPPED_ARB, &i);
 231    assert(i);
 232
 233    /* Make rectangle */
 234    v[0] = -1;  v[1] = -1;  v[2] = 0;
 235    v[3] =  1;  v[4] = -1;  v[5] = 0;
 236    v[6] =  1;  v[7] =  1;  v[8] = 0;
 237    v[9] = -1;  v[10] = 1;  v[11] = 0;
 238    c = v + 12;
 239    c[0] = 1;  c[1] = 0;  c[2] = 0;
 240    c[3] = 1;  c[4] = 0;  c[5] = 0;
 241    c[6] = 1;  c[7] = 0;  c[8] = 1;
 242    c[9] = 1;  c[10] = 0;  c[11] = 1;
 243    obj->NumVerts = 4;
 244    obj->VertexOffset = 0;
 245    obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
 246    obj->VertexStride = 0;
 247    obj->ColorStride = 0;
 248    obj->NumElements = 0;
 249
 250    glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
 251
 252    glGetBufferPointervARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAP_POINTER_ARB, &p);
 253    assert(!p);
 254
 255    glGetBufferParameterivARB(GL_ARRAY_BUFFER_ARB, GL_BUFFER_MAPPED_ARB, &i);
 256    assert(!i);
 257 }
 258
 259
 260 static void MakeObject2(struct object *obj)
 261 {
 262    GLfloat *v;
 263    int start = 40; /* bytes, to test non-zero array offsets */
 264
 265    glGenBuffersARB(1, &obj->BufferID);
 266    glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
 267    glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, NULL, GL_STATIC_DRAW_ARB);
 268    v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
 269
 270    v += start / sizeof(GLfloat);
 271
 272    /* Make triangle: interleaved colors, then positions */
 273    /*   R            G          B           X           Y            Z  */
 274    v[0] = 0;   v[1] = 1;   v[2] = 0;   v[3] = -1;  v[4] = -1;   v[5] = 0;
 275    v[6] = 0;   v[7] = 1;   v[8] = 0;   v[9] = 1;   v[10] = -1;  v[11] = 0;
 276    v[12] = 1;  v[13] = 1;  v[14] = 0;  v[15] = 0;  v[16] =  1;  v[17] = 0;
 277
 278    obj->NumVerts = 3;
 279    obj->VertexOffset = start + 3 * sizeof(GLfloat);
 280    obj->ColorOffset = start;
 281    obj->VertexStride = 6 * sizeof(GLfloat);
 282    obj->ColorStride = 6 * sizeof(GLfloat);
 283
 284    obj->NumElements = 0;
 285
 286    glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
 287 }
 288
 289
 290 static void MakeObject3(struct object *obj)
 291 {
 292    GLfloat vertexData[1000];
 293    GLfloat *v, *c;
 294    GLuint *i;
 295    int bytes;
 296
 297    /* Make rectangle */
 298    v = vertexData;
 299    v[0] = -1;  v[1] = -0.5;  v[2] = 0;
 300    v[3] =  1;  v[4] = -0.5;  v[5] = 0;
 301    v[6] =  1;  v[7] =  0.5;  v[8] = 0;
 302    v[9] = -1;  v[10] = 0.5;  v[11] = 0;
 303    c = vertexData + 12;
 304    c[0] = 0;  c[1] = 0;  c[2] = 1;
 305    c[3] = 0;  c[4] = 0;  c[5] = 1;
 306    c[6] = 0;  c[7] = 1;  c[8] = 1;
 307    c[9] = 0;  c[10] = 1;  c[11] = 1;
 308    obj->NumVerts = 4;
 309    obj->VertexOffset = 0;
 310    obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
 311    obj->VertexStride = 0;
 312    obj->ColorStride = 0;
 313
 314    bytes = obj->NumVerts * (3 + 3) * sizeof(GLfloat);
 315
 316    /* Don't use glMap/UnmapBuffer for this object */
 317    glGenBuffersARB(1, &obj->BufferID);
 318    glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
 319    glBufferDataARB(GL_ARRAY_BUFFER_ARB, bytes, vertexData, GL_STATIC_DRAW_ARB);
 320
 321    /* Setup a buffer of indices to test the ELEMENTS path */
 322    glGenBuffersARB(1, &obj->ElementsBufferID);
 323    glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, obj->ElementsBufferID);
 324    glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, 100, NULL, GL_STATIC_DRAW_ARB);
 325    i = (GLuint *) glMapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB);
 326    i[0] = 0;
 327    i[1] = 1;
 328    i[2] = 2;
 329    i[3] = 3;
 330    glUnmapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB);
 331    obj->NumElements = 4;
 332 }
 333
 334
 335
 336 static void Init( void )
 337 {
 338    if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) {
 339       printf("GL_ARB_vertex_buffer_object not found!\n");
 340       exit(0);
 341    }
 342    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 343
 344    /* Test buffer object deletion */
 345    if (1) {
 346       static GLubyte data[1000];
 347       GLuint id = 999;
 348       glBindBufferARB(GL_ARRAY_BUFFER_ARB, id);
 349       glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, data, GL_STATIC_DRAW_ARB);
 350       glVertexPointer(3, GL_FLOAT, 0, (void *) 0);
 351       glDeleteBuffersARB(1, &id);
 352       assert(!glIsBufferARB(id));
 353       glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
 354       glVertexPointer(3, GL_FLOAT, 0, (void *) 0);
 355       assert(!glIsBufferARB(id));
 356    }
 357
 358    MakeObject1(Objects + 0);
 359    MakeObject2(Objects + 1);
 360    MakeObject3(Objects + 2);
 361    NumObjects = 3;
 362 }
 363
 364
 365 int main( int argc, char *argv[] )
 366 {
 367    glutInit( &argc, argv );
 368    glutInitWindowPosition( 0, 0 );
 369    glutInitWindowSize( 600, 300 );
 370    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 371    Win = glutCreateWindow(argv[0]);
 372    glutReshapeFunc( Reshape );
 373    glutKeyboardFunc( Key );
 374    glutSpecialFunc( SpecialKey );
 375    glutDisplayFunc( Display );
 376    if (Anim)
 377       glutIdleFunc(Idle);
 378    Init();
 379    glutMainLoop();
 380    return 0;
 381 }