progs/trivial/vp-line-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 #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.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 #if 0
  49    glBegin(GL_LINES);
  50    glColor3f(0,0,1);
  51    glVertex3f( 0.75, -0.75, 0.0);
  52    glColor3f(0,1,0);
  53    glVertex3f( 0.75,  0.75, 0.0);
  54
  55    glColor3f(0,1,0);
  56    glVertex3f( 0.75,  0.75, 0.0);
  57    glColor3f(1,0,0);
  58    glVertex3f(-1.75,  0.0, 0.0);
  59    glEnd();
  60 #else
  61    glBegin(GL_LINE_STRIP);
  62    glColor3f(0,0,1);
  63    glVertex3f( 0.75, -0.75, 0.0);
  64    glColor3f(0,1,0);
  65    glVertex3f( 0.75,  0.75, 0.0);
  66    glColor3f(1,0,0);
  67    glVertex3f(-1.75,  0.0, 0.0);
  68    glEnd();
  69 #endif
  70
  71
  72    glFlush();
  73 }
  74
  75
  76 static void Reshape( int width, int height )
  77 {
  78    glViewport( 0, 0, width, height );
  79    glMatrixMode( GL_PROJECTION );
  80    glLoadIdentity();
  81    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  82    glMatrixMode( GL_MODELVIEW );
  83    glLoadIdentity();
  84    /*glTranslatef( 0.0, 0.0, -15.0 );*/
  85 }
  86
  87
  88 static void Key( unsigned char key, int x, int y )
  89 {
  90    (void) x;
  91    (void) y;
  92    switch (key) {
  93       case 27:
  94          exit(0);
  95          break;
  96    }
  97    glutPostRedisplay();
  98 }
  99
 100
 101
 102
 103 int main( int argc, char *argv[] )
 104 {
 105    glutInit( &argc, argv );
 106    glutInitWindowPosition( 0, 0 );
 107    glutInitWindowSize( 250, 250 );
 108    glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
 109    glutCreateWindow(argv[0]);
 110    glewInit();
 111    glutReshapeFunc( Reshape );
 112    glutKeyboardFunc( Key );
 113    glutDisplayFunc( Display );
 114    Init();
 115    glutMainLoop();
 116    return 0;
 117 }