progs/trivial/vp-tri-tex.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.texcoord[0], vertex.texcoord[0];\n"
  19       "MOV  result.position, 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 #define SIZE 32
  42    {
  43       GLubyte tex2d[SIZE][SIZE][3];
  44       GLint s, t;
  45
  46       for (s = 0; s < SIZE; s++) {
  47          for (t = 0; t < SIZE; t++) {
  48 #if 0
  49             tex2d[t][s][0] = (s < SIZE/2) ? 0 : 255;
  50             tex2d[t][s][1] = (t < SIZE/2) ? 0 : 255;
  51             tex2d[t][s][2] = 0;
  52 #else
  53             tex2d[t][s][0] = s*255/(SIZE-1);
  54             tex2d[t][s][1] = t*255/(SIZE-1);
  55             tex2d[t][s][2] = 0;
  56 #endif
  57          }
  58       }
  59
  60       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  61
  62       glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
  63                    GL_RGB, GL_UNSIGNED_BYTE, tex2d);
  64
  65       glEnable(GL_TEXTURE_2D);
  66       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  67       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
  68       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  69       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  70
  71       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  72    }
  73
  74 }
  75
  76 static void Display( void )
  77 {
  78    glClearColor(0.3, 0.3, 0.3, 1);
  79    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  80
  81    glEnable(GL_VERTEX_PROGRAM_NV);
  82
  83    glBegin(GL_TRIANGLES);
  84    glTexCoord2f(1,-1);
  85    glVertex3f( 0.9, -0.9, -0.0);
  86    glTexCoord2f(1,1);
  87    glVertex3f( 0.9,  0.9, -0.0);
  88    glTexCoord2f(-1,0);
  89    glVertex3f(-0.9,  0.0, -0.0);
  90    glEnd();
  91
  92
  93    glFlush();
  94 }
  95
  96
  97 static void Reshape( int width, int height )
  98 {
  99    glViewport( 0, 0, width, height );
 100    glMatrixMode( GL_PROJECTION );
 101    glLoadIdentity();
 102    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
 103    glMatrixMode( GL_MODELVIEW );
 104    glLoadIdentity();
 105    /*glTranslatef( 0.0, 0.0, -15.0 );*/
 106 }
 107
 108
 109 static void Key( unsigned char key, int x, int y )
 110 {
 111    (void) x;
 112    (void) y;
 113    switch (key) {
 114       case 27:
 115          exit(0);
 116          break;
 117    }
 118    glutPostRedisplay();
 119 }
 120
 121
 122
 123
 124 int main( int argc, char *argv[] )
 125 {
 126    glutInit( &argc, argv );
 127    glutInitWindowPosition( 0, 0 );
 128    glutInitWindowSize( 250, 250 );
 129    glutInitDisplayMode( GLUT_DEPTH | GLUT_RGB | GLUT_SINGLE );
 130    glutCreateWindow(argv[0]);
 131    glutReshapeFunc( Reshape );
 132    glutKeyboardFunc( Key );
 133    glutDisplayFunc( Display );
 134    Init();
 135    glutMainLoop();
 136    return 0;
 137 }