progs/tests/arbfpspec.c

   1 /*
   2  * To demo that specular color gets lost someplace after vertex
   3  * program completion and fragment program startup
   4  */
   5
   6 #include <assert.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <math.h>
  11 #include <GL/glew.h>
  12 #include <GL/glut.h>
  13
  14 static float Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
  15 static GLboolean Anim = GL_TRUE;
  16
  17
  18 static void Idle( void )
  19 {
  20    Xrot += .3;
  21    Yrot += .4;
  22    Zrot += .2;
  23    glutPostRedisplay();
  24 }
  25
  26
  27 static void Display( void )
  28 {
  29    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  30
  31    glPushMatrix();
  32       glRotatef(Xrot, 1, 0, 0);
  33       glRotatef(Yrot, 0, 1, 0);
  34       glRotatef(Zrot, 0, 0, 1);
  35       glutSolidTorus(0.75, 2.0, 10, 20);
  36    glPopMatrix();
  37
  38    glutSwapBuffers();
  39 }
  40
  41
  42 static void Reshape( int width, int height )
  43 {
  44    glViewport( 0, 0, width, height );
  45    glMatrixMode( GL_PROJECTION );
  46    glLoadIdentity();
  47    glFrustum( -2.0, 2.0, -2.0, 2.0, 5.0, 25.0 );
  48    glMatrixMode( GL_MODELVIEW );
  49    glLoadIdentity();
  50    glTranslatef( 0.0, 0.0, -12.0 );
  51 }
  52
  53
  54 static void Key( unsigned char key, int x, int y )
  55 {
  56    (void) x;
  57    (void) y;
  58    switch (key) {
  59       case ' ':
  60          Xrot = Yrot = Zrot = 0;
  61          break;
  62       case 'a':
  63          Anim = !Anim;
  64          if (Anim)
  65             glutIdleFunc(Idle);
  66          else
  67             glutIdleFunc(NULL);
  68          break;
  69       case 'z':
  70          Zrot -= 5.0;
  71          break;
  72       case 'Z':
  73          Zrot += 5.0;
  74          break;
  75       case 27:
  76          exit(0);
  77          break;
  78    }
  79    glutPostRedisplay();
  80 }
  81
  82
  83 static void SpecialKey( int key, int x, int y )
  84 {
  85    const GLfloat step = 3.0;
  86    (void) x;
  87    (void) y;
  88    switch (key) {
  89       case GLUT_KEY_UP:
  90          Xrot -= step;
  91          break;
  92       case GLUT_KEY_DOWN:
  93          Xrot += step;
  94          break;
  95       case GLUT_KEY_LEFT:
  96          Yrot -= step;
  97          break;
  98       case GLUT_KEY_RIGHT:
  99          Yrot += step;
 100          break;
 101    }
 102    glutPostRedisplay();
 103 }
 104
 105
 106 static void Init( void )
 107 {
 108    GLint errno;
 109    GLuint prognum, fprognum;
 110
 111    static const char prog[] =
 112       "!!ARBvp1.0\n"
 113       "DP4   result.position.x, state.matrix.mvp.row[0], vertex.position ;\n"
 114       "DP4   result.position.y, state.matrix.mvp.row[1], vertex.position ;\n"
 115       "DP4   result.position.z, state.matrix.mvp.row[2], vertex.position ;\n"
 116       "DP4   result.position.w, state.matrix.mvp.row[3], vertex.position ;\n"
 117       "MOV   result.color.front.primary,   {.5, .5, .5, 1};\n"
 118       "MOV   result.color.front.secondary, {1, 1, 1, 1};\n"
 119       "END";
 120
 121     static const char fprog[] =
 122       "!!ARBfp1.0\n"
 123       "MOV result.color, fragment.color.secondary;\n"
 124       "END";
 125
 126    if (!glutExtensionSupported("GL_ARB_vertex_program")) {
 127       printf("Sorry, this program requires GL_ARB_vertex_program");
 128       exit(1);
 129    }
 130
 131    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
 132       printf("Sorry, this program requires GL_ARB_fragment_program");
 133       exit(1);
 134    }
 135
 136    glGenProgramsARB(1, &prognum);
 137    glGenProgramsARB(1, &fprognum);
 138
 139    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
 140    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 141                         strlen(prog), (const GLubyte *) prog);
 142
 143    assert(glIsProgramARB(prognum));
 144    errno = glGetError();
 145    printf("glGetError = %d\n", errno);
 146    if (errno != GL_NO_ERROR)
 147    {
 148       GLint errorpos;
 149
 150       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
 151       printf("errorpos: %d\n", errorpos);
 152       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 153    }
 154
 155    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, fprognum);
 156    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 157                         strlen(fprog), (const GLubyte *) fprog);
 158    errno = glGetError();
 159    printf("glGetError = %d\n", errno);
 160    if (errno != GL_NO_ERROR)
 161    {
 162       GLint errorpos;
 163
 164       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
 165       printf("errorpos: %d\n", errorpos);
 166       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 167    }
 168
 169    glEnable(GL_VERTEX_PROGRAM_ARB);
 170    glEnable(GL_FRAGMENT_PROGRAM_ARB);
 171    glEnable(GL_DEPTH_TEST);
 172    glClearColor(0.3, 0.3, 0.3, 1);
 173 }
 174
 175
 176 int main( int argc, char *argv[] )
 177 {
 178    glutInit( &argc, argv );
 179    glutInitWindowPosition( 0, 0 );
 180    glutInitWindowSize( 250, 250 );
 181    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 182    glutCreateWindow(argv[0]);
 183    glewInit();
 184    glutReshapeFunc( Reshape );
 185    glutKeyboardFunc( Key );
 186    glutSpecialFunc( SpecialKey );
 187    glutDisplayFunc( Display );
 188    if (Anim)
 189       glutIdleFunc(Idle);
 190    Init();
 191    glutMainLoop();
 192    return 0;
 193 }