progs/tests/texline.c

   1
   2 /*
   3  * Test textured lines.
   4  *
   5  * Brian Paul
   6  * September 2000
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <math.h>
  12 #include <GL/glut.h>
  13 #include "../util/readtex.c"   /* I know, this is a hack. */
  14
  15 #define TEXTURE_FILE "../images/girl.rgb"
  16
  17 static GLboolean Antialias = GL_FALSE;
  18 static GLboolean Animate = GL_FALSE;
  19 static GLint Texture = 1;
  20 static GLboolean Stipple = GL_FALSE;
  21 static GLfloat LineWidth = 1.0;
  22
  23 static GLfloat Xrot = -60.0, Yrot = 0.0, Zrot = 0.0;
  24 static GLfloat DYrot = 1.0;
  25 static GLboolean Points = GL_FALSE;
  26 static GLfloat Scale = 1.0;
  27
  28 static void Idle( void )
  29 {
  30    if (Animate) {
  31       Zrot += DYrot;
  32       glutPostRedisplay();
  33    }
  34 }
  35
  36
  37 static void Display( void )
  38 {
  39    GLfloat x, y, s, t;
  40
  41    glClear( GL_COLOR_BUFFER_BIT );
  42
  43    glPushMatrix();
  44    glRotatef(Xrot, 1.0, 0.0, 0.0);
  45    glRotatef(Yrot, 0.0, 1.0, 0.0);
  46    glRotatef(Zrot, 0.0, 0.0, 1.0);
  47    glScalef(Scale, Scale, Scale);
  48
  49    if (Texture)
  50       glColor3f(1, 1, 1);
  51
  52    if (Points) {
  53       glBegin(GL_POINTS);
  54       for (t = 0.0; t <= 1.0; t += 0.025) {
  55          for (s = 0.0; s <= 1.0; s += 0.025) {
  56             x = s * 2.0 - 1.0;
  57             y = t * 2.0 - 1.0;
  58             if (!Texture)
  59                glColor3f(1, 0, 1);
  60             glMultiTexCoord2fARB(GL_TEXTURE1_ARB, t, s);
  61             glTexCoord2f(s, t);
  62             glVertex2f(x, y);
  63          }
  64       }
  65       glEnd();
  66    }
  67    else {
  68       glBegin(GL_LINES);
  69       for (t = 0.0; t <= 1.0; t += 0.025) {
  70          x = t * 2.0 - 1.0;
  71          if (!Texture)
  72             glColor3f(1, 0, 1);
  73          glTexCoord2f(t, 0.0);
  74          glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, t);
  75          glVertex2f(x, -1.0);
  76          if (!Texture)
  77             glColor3f(0, 1, 0);
  78          glTexCoord2f(t, 1.0);
  79          glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, t);
  80          glVertex2f(x, 1.0);
  81       }
  82       glEnd();
  83    }
  84
  85    glPopMatrix();
  86
  87    glutSwapBuffers();
  88 }
  89
  90
  91 static void Reshape( int width, int height )
  92 {
  93    GLfloat ar = (float) width / height;
  94    glViewport( 0, 0, width, height );
  95    glMatrixMode( GL_PROJECTION );
  96    glLoadIdentity();
  97    glFrustum( -ar, ar, -1.0, 1.0, 10.0, 100.0 );
  98    glMatrixMode( GL_MODELVIEW );
  99    glLoadIdentity();
 100    glTranslatef( 0.0, 0.0, -12.0 );
 101 }
 102
 103
 104 static void Key( unsigned char key, int x, int y )
 105 {
 106    (void) x;
 107    (void) y;
 108    switch (key) {
 109       case 'a':
 110          Antialias = !Antialias;
 111          if (Antialias) {
 112             glEnable(GL_LINE_SMOOTH);
 113             glEnable(GL_POINT_SMOOTH);
 114             glEnable(GL_BLEND);
 115             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 116          }
 117          else {
 118             glDisable(GL_LINE_SMOOTH);
 119             glDisable(GL_POINT_SMOOTH);
 120             glDisable(GL_BLEND);
 121          }
 122          break;
 123       case 't':
 124          Texture++;
 125          if (Texture > 2)
 126             Texture = 0;
 127          if (Texture == 0) {
 128             glActiveTextureARB(GL_TEXTURE0_ARB);
 129             glDisable(GL_TEXTURE_2D);
 130             glActiveTextureARB(GL_TEXTURE1_ARB);
 131             glDisable(GL_TEXTURE_2D);
 132          }
 133          else if (Texture == 1) {
 134             glActiveTextureARB(GL_TEXTURE0_ARB);
 135             glEnable(GL_TEXTURE_2D);
 136             glActiveTextureARB(GL_TEXTURE1_ARB);
 137             glDisable(GL_TEXTURE_2D);
 138          }
 139          else {
 140             glActiveTextureARB(GL_TEXTURE0_ARB);
 141             glEnable(GL_TEXTURE_2D);
 142             glActiveTextureARB(GL_TEXTURE1_ARB);
 143             glEnable(GL_TEXTURE_2D);
 144          }
 145          break;
 146       case 'w':
 147          LineWidth -= 0.25;
 148          if (LineWidth < 0.25)
 149             LineWidth = 0.25;
 150          glLineWidth(LineWidth);
 151          glPointSize(LineWidth);
 152          break;
 153       case 'W':
 154          LineWidth += 0.25;
 155          if (LineWidth > 8.0)
 156             LineWidth = 8.0;
 157          glLineWidth(LineWidth);
 158          glPointSize(LineWidth);
 159          break;
 160       case 'p':
 161          Points = !Points;
 162          break;
 163       case 's':
 164          Stipple = !Stipple;
 165          if (Stipple)
 166             glEnable(GL_LINE_STIPPLE);
 167          else
 168             glDisable(GL_LINE_STIPPLE);
 169          break;
 170       case ' ':
 171          Animate = !Animate;
 172          if (Animate)
 173             glutIdleFunc(Idle);
 174          else
 175             glutIdleFunc(NULL);
 176          break;
 177       case 27:
 178          exit(0);
 179          break;
 180    }
 181    printf("LineWidth, PointSize = %f\n", LineWidth);
 182    glutPostRedisplay();
 183 }
 184
 185
 186 static void SpecialKey( int key, int x, int y )
 187 {
 188    float step = 3.0;
 189    (void) x;
 190    (void) y;
 191
 192    switch (key) {
 193       case GLUT_KEY_UP:
 194          Xrot += step;
 195          break;
 196       case GLUT_KEY_DOWN:
 197          Xrot -= step;
 198          break;
 199       case GLUT_KEY_LEFT:
 200          Yrot += step;
 201          break;
 202       case GLUT_KEY_RIGHT:
 203          Yrot -= step;
 204          break;
 205    }
 206    glutPostRedisplay();
 207 }
 208
 209
 210 static void Init( int argc, char *argv[] )
 211 {
 212    GLfloat r[2];
 213    GLuint u;
 214
 215    for (u = 0; u < 2; u++) {
 216       glActiveTextureARB(GL_TEXTURE0_ARB + u);
 217       glBindTexture(GL_TEXTURE_2D, 10+u);
 218       if (u == 0)
 219          glEnable(GL_TEXTURE_2D);
 220       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 221       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 222       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 223       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 224
 225       if (u == 0)
 226          glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 227       else
 228          glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
 229
 230       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 231       if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
 232          printf("Error: couldn't load texture image\n");
 233          exit(1);
 234       }
 235    }
 236
 237    glLineStipple(1, 0xff);
 238
 239    if (argc > 1 && strcmp(argv[1], "-info")==0) {
 240       printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
 241       printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
 242       printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
 243       printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
 244    }
 245
 246    glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, r);
 247    printf("Non-smooth point size range: %g .. %g\n", r[0], r[1]);
 248    glGetFloatv(GL_POINT_SIZE_RANGE, r);
 249    printf("Smoothed point size range: %g .. %g\n", r[0], r[1]);
 250    glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, r);
 251    printf("Non-smooth line width range: %g .. %g\n", r[0], r[1]);
 252    glGetFloatv(GL_LINE_WIDTH_RANGE, r);
 253    printf("Smoothed line width range: %g .. %g\n", r[0], r[1]);
 254 }
 255
 256
 257 int main( int argc, char *argv[] )
 258 {
 259    glutInit( &argc, argv );
 260    glutInitWindowPosition(0, 0);
 261    glutInitWindowSize( 400, 300 );
 262
 263    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
 264
 265    glutCreateWindow(argv[0] );
 266
 267    Init(argc, argv);
 268
 269    glutReshapeFunc( Reshape );
 270    glutKeyboardFunc( Key );
 271    glutSpecialFunc( SpecialKey );
 272    glutDisplayFunc( Display );
 273    if (Animate)
 274       glutIdleFunc( Idle );
 275
 276    glutMainLoop();
 277    return 0;
 278 }