src/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 #include <GL/glew.h>
   9 #include "glut_wrap.h"
  10
  11 #include "readtex.c"
  12
  13
  14 #define TEXTURE_FILE DEMOS_DATA_DIR "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 #define Q 2
  30    glColor4f(1.0, 1.0, 1.0, 1);   glTexCoord4f(0, 0, 0, Q);   glVertex2f(-1, -1);
  31    glColor4f(0.2, 0.2, 1.0, 1);   glTexCoord4f(1, 0, 0, Q);   glVertex2f( 1, -1);
  32    glColor4f(0.2, 1.0, 0.2, 1);   glTexCoord4f(1, 1, 0, Q);   glVertex2f( 1,  1);
  33    glColor4f(1.0, 0.2, 0.2, 1);   glTexCoord4f(0, 1, 0, Q);   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       "TEX R0, fragment.texcoord[0], texture[0], 2D; \n"
  97       "MUL result.color, R0, fragment.color; \n"
  98       "END"
  99       ;
 100    GLuint modulateProg;
 101    GLuint Texture;
 102
 103    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
 104       printf("Error: GL_ARB_fragment_program not supported!\n");
 105       exit(1);
 106    }
 107    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 108
 109    /* Setup the fragment program */
 110    glGenProgramsARB(1, &modulateProg);
 111    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
 112    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
 113                         strlen(modulate2D), (const GLubyte *)modulate2D);
 114
 115    printf("glGetError = 0x%x\n", (int) glGetError());
 116    printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
 117           (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
 118    assert(glIsProgramARB(modulateProg));
 119
 120    glEnable(GL_FRAGMENT_PROGRAM_ARB);
 121
 122    /* Load texture */
 123    glGenTextures(1, &Texture);
 124    glBindTexture(GL_TEXTURE_2D, Texture);
 125    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 126    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 127    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 128    if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
 129       printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
 130       exit(1);
 131    }
 132    /* XXX this enable shouldn't really be needed!!! */
 133    glEnable(GL_TEXTURE_2D);
 134
 135    glClearColor(.3, .3, .3, 0);
 136 }
 137
 138
 139 int main( int argc, char *argv[] )
 140 {
 141    glutInit( &argc, argv );
 142    glutInitWindowPosition( 0, 0 );
 143    glutInitWindowSize( 250, 250 );
 144    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 145    glutCreateWindow(argv[0]);
 146    glewInit();
 147    glutReshapeFunc( Reshape );
 148    glutKeyboardFunc( Key );
 149    glutSpecialFunc( SpecialKey );
 150    glutDisplayFunc( Display );
 151    Init();
 152    glutMainLoop();
 153    return 0;
 154 }