progs/tests/arbfptexture.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 #define GL_GLEXT_PROTOTYPES
   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
  19 static void Display( void )
  20 {
  21    glClear( GL_COLOR_BUFFER_BIT );
  22
  23    glPushMatrix();
  24    glRotatef(Xrot, 1.0, 0.0, 0.0);
  25    glRotatef(Yrot, 0.0, 1.0, 0.0);
  26    glRotatef(Zrot, 0.0, 0.0, 1.0);
  27
  28    glBegin(GL_POLYGON);
  29    glColor4f(1.0, 1.0, 1.0, 1);   glTexCoord2f(0, 0);   glVertex2f(-1, -1);
  30    glColor4f(0.2, 0.2, 1.0, 1);   glTexCoord2f(1, 0);   glVertex2f( 1, -1);
  31    glColor4f(0.2, 1.0, 0.2, 1);   glTexCoord2f(1, 1);   glVertex2f( 1,  1);
  32    glColor4f(1.0, 0.2, 0.2, 1);   glTexCoord2f(0, 1);   glVertex2f(-1,  1);
  33    glEnd();
  34
  35    glPopMatrix();
  36
  37    glutSwapBuffers();
  38 }
  39
  40
  41 static void Reshape( int width, int height )
  42 {
  43    glViewport( 0, 0, width, height );
  44    glMatrixMode( GL_PROJECTION );
  45    glLoadIdentity();
  46    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
  47    glMatrixMode( GL_MODELVIEW );
  48    glLoadIdentity();
  49    glTranslatef( 0.0, 0.0, -8.0 );
  50 }
  51
  52
  53 static void SpecialKey( int key, int x, int y )
  54 {
  55    float step = 3.0;
  56    (void) x;
  57    (void) y;
  58
  59    switch (key) {
  60       case GLUT_KEY_UP:
  61          Xrot += step;
  62          break;
  63       case GLUT_KEY_DOWN:
  64          Xrot -= step;
  65          break;
  66       case GLUT_KEY_LEFT:
  67          Yrot += step;
  68          break;
  69       case GLUT_KEY_RIGHT:
  70          Yrot -= step;
  71          break;
  72    }
  73    glutPostRedisplay();
  74 }
  75
  76
  77 static void Key( unsigned char key, int x, int y )
  78 {
  79    (void) x;
  80    (void) y;
  81    switch (key) {
  82       case 27:
  83          exit(0);
  84          break;
  85    }
  86    glutPostRedisplay();
  87 }
  88
  89
  90 static void Init( void )
  91 {
  92    static const char *modulate2D =
  93       "!!ARBfp1.0\n"
  94       "TEMP R0;\n"
  95       "TEX R0, fragment.texcoord[0], texture[0], 2D; \n"
  96       "MUL result.color, R0, fragment.color; \n"
  97       "END"
  98       ;
  99    GLuint modulateProg;
 100    GLuint Texture;
 101
 102    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
 103       printf("Error: GL_ARB_fragment_program not supported!\n");
 104       exit(1);
 105    }
 106    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 107
 108    /* Setup the fragment program */
 109    glGenProgramsARB(1, &modulateProg);
 110    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
 111    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 112                         strlen(modulate2D), (const GLubyte *)modulate2D);
 113
 114    printf("glGetError = 0x%x\n", (int) glGetError());
 115    printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
 116           (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 117    assert(glIsProgramARB(modulateProg));
 118
 119    glEnable(GL_FRAGMENT_PROGRAM_ARB);
 120
 121    /* Load texture */
 122    glGenTextures(1, &Texture);
 123    glBindTexture(GL_TEXTURE_2D, Texture);
 124    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 125    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 126    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 127    if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
 128       printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
 129       exit(1);
 130    }
 131    /* XXX this enable shouldn't really be needed!!! */
 132    glEnable(GL_TEXTURE_2D);
 133
 134    glClearColor(.3, .3, .3, 0);
 135 }
 136
 137
 138 int main( int argc, char *argv[] )
 139 {
 140    glutInit( &argc, argv );
 141    glutInitWindowPosition( 0, 0 );
 142    glutInitWindowSize( 250, 250 );
 143    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 144    glutCreateWindow(argv[0]);
 145    glutReshapeFunc( Reshape );
 146    glutKeyboardFunc( Key );
 147    glutSpecialFunc( SpecialKey );
 148    glutDisplayFunc( Display );
 149    Init();
 150    glutMainLoop();
 151    return 0;
 152 }