progs/trivial/vp-tri-swap.c

   1 /* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */
   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 static void Init( void )
  12 {
  13    GLint errno;
  14    GLuint prognum;
  15
  16    static const char *prog1 =
  17       "!!ARBvp1.0\n"
  18       "MOV  result.position, vertex.color;\n"
  19       "MOV  result.color, vertex.position;\n"
  20       "END\n";
  21
  22
  23    glGenProgramsARB(1, &prognum);
  24
  25    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
  26    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  27                       strlen(prog1), (const GLubyte *) prog1);
  28
  29    assert(glIsProgramARB(prognum));
  30    errno = glGetError();
  31    printf("glGetError = %d\n", errno);
  32    if (errno != GL_NO_ERROR)
  33    {
  34       GLint errorpos;
  35
  36       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  37       printf("errorpos: %d\n", errorpos);
  38       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  39    }
  40 }
  41
  42 static void Display( void )
  43 {
  44    glClearColor(0.3, 0.3, 0.3, 1);
  45    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  46
  47    glEnable(GL_VERTEX_PROGRAM_NV);
  48
  49    glBegin(GL_TRIANGLES);
  50    glColor3f(0,0,.7);
  51    glVertex3f( 0.9, -0.9, -0.0);
  52    glColor3f(.8,0,0);
  53    glVertex3f( 0.9,  0.9, -0.0);
  54    glColor3f(0,.9,0);
  55    glVertex3f(-0.9,  0.0, -0.0);
  56    glEnd();
  57
  58
  59    glFlush();
  60 }
  61
  62
  63 static void Reshape( int width, int height )
  64 {
  65    glViewport( 0, 0, width, height );
  66    glMatrixMode( GL_PROJECTION );
  67    glLoadIdentity();
  68    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  69    glMatrixMode( GL_MODELVIEW );
  70    glLoadIdentity();
  71    /*glTranslatef( 0.0, 0.0, -15.0 );*/
  72 }
  73
  74
  75 static void Key( unsigned char key, int x, int y )
  76 {
  77    (void) x;
  78    (void) y;
  79    switch (key) {
  80       case 27:
  81          exit(0);
  82          break;
  83    }
  84    glutPostRedisplay();
  85 }
  86
  87
  88
  89
  90 int main( int argc, char *argv[] )
  91 {
  92    glutInit( &argc, argv );
  93    glutInitWindowPosition( 0, 0 );
  94    glutInitWindowSize( 250, 250 );
  95    glutInitDisplayMode( GLUT_DEPTH | GLUT_RGB | GLUT_SINGLE );
  96    glutCreateWindow(argv[0]);
  97    glewInit();
  98    glutReshapeFunc( Reshape );
  99    glutKeyboardFunc( Key );
 100    glutDisplayFunc( Display );
 101    Init();
 102    glutMainLoop();
 103    return 0;
 104 }