progs/tests/arbfptrig.c

   1 /* GL_ARB_fragment_program texture test */
   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 #include "readtex.c"
  12
  13
  14 #define TEXTURE_FILE "../images/girl.rgb"
  15
  16 static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
  17
  18 #define PI 3.141592
  19
  20 static void Display( void )
  21 {
  22    glClear( GL_COLOR_BUFFER_BIT );
  23
  24    glPushMatrix();
  25    glRotatef(Xrot, 1.0, 0.0, 0.0);
  26    glRotatef(Yrot, 0.0, 1.0, 0.0);
  27    glRotatef(Zrot, 0.0, 0.0, 1.0);
  28
  29    glBegin(GL_POLYGON);
  30    glTexCoord2f(-PI, 0);   glVertex2f(-1, -1);
  31    glTexCoord2f(PI, 0);   glVertex2f( 1, -1);
  32    glTexCoord2f(PI, 1);   glVertex2f( 1,  1);
  33    glTexCoord2f(-PI, 1);   glVertex2f(-1,  1);
  34    glEnd();
  35
  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( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
  48    glMatrixMode( GL_MODELVIEW );
  49    glLoadIdentity();
  50    glTranslatef( 0.0, 0.0, -8.0 );
  51 }
  52
  53
  54 static void SpecialKey( int key, int x, int y )
  55 {
  56    float step = 3.0;
  57    (void) x;
  58    (void) y;
  59
  60    switch (key) {
  61       case GLUT_KEY_UP:
  62          Xrot += step;
  63          break;
  64       case GLUT_KEY_DOWN:
  65          Xrot -= step;
  66          break;
  67       case GLUT_KEY_LEFT:
  68          Yrot += step;
  69          break;
  70       case GLUT_KEY_RIGHT:
  71          Yrot -= step;
  72          break;
  73    }
  74    glutPostRedisplay();
  75 }
  76
  77
  78 static void Key( unsigned char key, int x, int y )
  79 {
  80    (void) x;
  81    (void) y;
  82    switch (key) {
  83       case 27:
  84          exit(0);
  85          break;
  86    }
  87    glutPostRedisplay();
  88 }
  89
  90
  91 static void Init( void )
  92 {
  93    static const char *modulate2D =
  94       "!!ARBfp1.0\n"
  95       "TEMP R0;\n"
  96       "MOV R0, {0,0,0,1};\n"
  97       "SCS R0, fragment.texcoord[0].x; \n"
  98       "ADD R0, R0, {1.0}.x;\n"
  99       "MUL R0, R0, {0.5}.x;\n"
 100       "MOV result.color, R0; \n"
 101       "END"
 102       ;
 103    GLuint modulateProg;
 104    GLuint Texture;
 105
 106    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
 107       printf("Error: GL_ARB_fragment_program not supported!\n");
 108       exit(1);
 109    }
 110    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 111
 112    /* Setup the fragment program */
 113    glGenProgramsARB(1, &modulateProg);
 114    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
 115    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 116                         strlen(modulate2D), (const GLubyte *)modulate2D);
 117
 118    printf("glGetError = 0x%x\n", (int) glGetError());
 119    printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
 120           (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 121    assert(glIsProgramARB(modulateProg));
 122
 123    glEnable(GL_FRAGMENT_PROGRAM_ARB);
 124
 125    /* Load texture */
 126    glGenTextures(1, &Texture);
 127    glBindTexture(GL_TEXTURE_2D, Texture);
 128    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 129    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 130    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 131    if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
 132       printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
 133       exit(1);
 134    }
 135    /* XXX this enable shouldn't really be needed!!! */
 136    glEnable(GL_TEXTURE_2D);
 137
 138    glClearColor(.3, .3, .3, 0);
 139 }
 140
 141
 142 int main( int argc, char *argv[] )
 143 {
 144    glutInit( &argc, argv );
 145    glutInitWindowPosition( 0, 0 );
 146    glutInitWindowSize( 250, 250 );
 147    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 148    glutCreateWindow(argv[0]);
 149    glewInit();
 150    glutReshapeFunc( Reshape );
 151    glutKeyboardFunc( Key );
 152    glutSpecialFunc( SpecialKey );
 153    glutDisplayFunc( Display );
 154    Init();
 155    glutMainLoop();
 156    return 0;
 157 }