progs/trivial/vp-clip.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 #define GL_GLEXT_PROTOTYPES
   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.color, vertex.color;\n"
  19       "MOV  result.position, vertex.position;\n"
  20       "END\n";
  21
  22    glGenProgramsARB(1, &prognum);
  23
  24    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
  25    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  26                       strlen(prog1), (const GLubyte *) prog1);
  27
  28    assert(glIsProgramARB(prognum));
  29    errno = glGetError();
  30    printf("glGetError = %d\n", errno);
  31    if (errno != GL_NO_ERROR)
  32    {
  33       GLint errorpos;
  34
  35       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  36       printf("errorpos: %d\n", errorpos);
  37       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  38    }
  39 }
  40
  41 static void Display( void )
  42 {
  43    glClearColor(0.3, 0.3, 0.3, 1);
  44    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  45
  46    glEnable(GL_VERTEX_PROGRAM_NV);
  47
  48    glBegin(GL_TRIANGLES);
  49    glColor3f(0,0,1);
  50    glVertex3f( 2.0, -2.0, 0.0);
  51    glColor3f(0,1,0);
  52    glVertex3f( 2.0,  2.0, 0.0);
  53    glColor3f(1,0,0);
  54    glVertex3f(-2.0,  0.0, 0.0);
  55    glEnd();
  56
  57
  58    glFlush();
  59 }
  60
  61
  62 static void Reshape( int width, int height )
  63 {
  64    glViewport( 0, 0, width, height );
  65    glMatrixMode( GL_PROJECTION );
  66    glLoadIdentity();
  67    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  68    glMatrixMode( GL_MODELVIEW );
  69    glLoadIdentity();
  70    /*glTranslatef( 0.0, 0.0, -15.0 );*/
  71 }
  72
  73
  74 static void Key( unsigned char key, int x, int y )
  75 {
  76    (void) x;
  77    (void) y;
  78    switch (key) {
  79       case 27:
  80          exit(0);
  81          break;
  82    }
  83    glutPostRedisplay();
  84 }
  85
  86
  87
  88
  89 int main( int argc, char *argv[] )
  90 {
  91    glutInit( &argc, argv );
  92    glutInitWindowPosition( 0, 0 );
  93    glutInitWindowSize( 250, 250 );
  94    glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
  95    glutCreateWindow(argv[0]);
  96    glutReshapeFunc( Reshape );
  97    glutKeyboardFunc( Key );
  98    glutDisplayFunc( Display );
  99    Init();
 100    glutMainLoop();
 101    return 0;
 102 }