progs/trivial/vbo-noninterleaved.c

   1 /* Basic VBO */
   2
   3 #include <assert.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <math.h>
   8 #include <GL/glew.h>
   9 #include <GL/glut.h>
  10
  11
  12 struct {
  13    GLfloat pos[4][4];
  14    GLfloat col[4][4];
  15 } verts =
  16 {
  17    /* Position: a quad
  18     */
  19    {
  20       {  0.9, -0.9, 0.0, 1.0 },
  21       {  0.9,  0.9, 0.0, 1.0 },
  22       { -0.9,  0.9, 0.0, 1.0 },
  23       { -0.9, -0.9, 0.0, 1.0 },
  24    },
  25
  26    /* Color: all red
  27     */
  28    {
  29       { 1.0, 0.0, 0.0, 1.0 },
  30       { 1.0, 0.0, 0.0, 1.0 },
  31       { 1.0, 0.0, 0.0, 1.0 },
  32       { 1.0, 0.0, 0.0, 1.0 },
  33    },
  34
  35
  36 };
  37
  38 GLuint arrayObj, elementObj;
  39
  40 static void Init( void )
  41 {
  42    GLint errno;
  43    GLuint prognum;
  44
  45    static const char *prog1 =
  46       "!!ARBvp1.0\n"
  47       "MOV  result.color, vertex.color;\n"
  48       "MOV  result.position, vertex.position;\n"
  49       "END\n";
  50
  51    glGenProgramsARB(1, &prognum);
  52    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
  53    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  54                       strlen(prog1), (const GLubyte *) prog1);
  55
  56    assert(glIsProgramARB(prognum));
  57    errno = glGetError();
  58    printf("glGetError = %d\n", errno);
  59    if (errno != GL_NO_ERROR)
  60    {
  61       GLint errorpos;
  62
  63       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  64       printf("errorpos: %d\n", errorpos);
  65       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  66    }
  67
  68
  69    glEnableClientState( GL_VERTEX_ARRAY );
  70    glEnableClientState( GL_COLOR_ARRAY );
  71
  72    glGenBuffersARB(1, &arrayObj);
  73    glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
  74    glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB);
  75
  76    glVertexPointer( 4, GL_FLOAT, sizeof(verts.pos[0]), 0 );
  77    glColorPointer( 4, GL_FLOAT, sizeof(verts.col[0]), (void *)(4*4*sizeof(float)) );
  78
  79 }
  80
  81
  82
  83 static void Display( void )
  84 {
  85    glClearColor(0.3, 0.3, 0.3, 1);
  86    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  87
  88    glEnable(GL_VERTEX_PROGRAM_ARB);
  89
  90    /* glDrawArrays( GL_TRIANGLES, 0, 3 ); */
  91    /* glDrawArrays( GL_TRIANGLES, 1, 3 ); */
  92    glDrawArrays( GL_QUADS, 0, 4 );
  93
  94    glFlush();
  95 }
  96
  97
  98 static void Reshape( int width, int height )
  99 {
 100    glViewport( 0, 0, width, height );
 101    glMatrixMode( GL_PROJECTION );
 102    glLoadIdentity();
 103    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
 104    glMatrixMode( GL_MODELVIEW );
 105    glLoadIdentity();
 106    /*glTranslatef( 0.0, 0.0, -15.0 );*/
 107 }
 108
 109
 110 static void Key( unsigned char key, int x, int y )
 111 {
 112    (void) x;
 113    (void) y;
 114    switch (key) {
 115       case 27:
 116          exit(0);
 117          break;
 118    }
 119    glutPostRedisplay();
 120 }
 121
 122
 123
 124
 125 int main( int argc, char *argv[] )
 126 {
 127    glutInit( &argc, argv );
 128    glutInitWindowPosition( 0, 0 );
 129    glutInitWindowSize( 250, 250 );
 130    glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
 131    glutCreateWindow(argv[0]);
 132    glewInit();
 133    glutReshapeFunc( Reshape );
 134    glutKeyboardFunc( Key );
 135    glutDisplayFunc( Display );
 136    Init();
 137    glutMainLoop();
 138    return 0;
 139 }