3 * Test multisampling and polygon smoothing.
15 static GLfloat Zrot
= 0;
16 static GLboolean Anim
= GL_TRUE
;
17 static GLboolean HaveMultisample
= GL_TRUE
;
21 PrintString(const char *s
)
24 glutBitmapCharacter(GLUT_BITMAP_8_BY_13
, (int) *s
);
31 Polygon( GLint verts
, GLfloat radius
, GLfloat z
)
34 for (i
= 0; i
< verts
; i
++) {
35 float a
= (i
* 2.0 * 3.14159) / verts
;
36 float x
= radius
* cos(a
);
37 float y
= radius
* sin(a
);
48 glBegin(GL_LINE_LOOP
);
54 glBegin(GL_LINE_LOOP
);
60 Polygon(12, 0.4, 0.3);
65 Polygon(12, 0.6, 0.2);
70 Polygon(12, 0.8, 0.1);
83 glClear( GL_COLOR_BUFFER_BIT
| GL_DEPTH_BUFFER_BIT
);
86 if (HaveMultisample
) {
87 glRasterPos2f(-3.1, -1.6);
88 PrintString("MULTISAMPLE");
90 glRasterPos2f(-0.8, -1.6);
91 PrintString("No antialiasing");
92 glRasterPos2f(1.6, -1.6);
93 PrintString("GL_POLYGON_SMOOTH");
96 if (HaveMultisample
) {
97 glEnable(GL_DEPTH_TEST
);
98 glEnable(GL_MULTISAMPLE_ARB
);
100 glTranslatef(-2.5, 0, 0);
102 glRotatef(Zrot
, 0, 0, 1);
106 glDisable(GL_MULTISAMPLE_ARB
);
107 glDisable(GL_DEPTH_TEST
);
111 glEnable(GL_DEPTH_TEST
);
113 glTranslatef(0, 0, 0);
115 glRotatef(Zrot
, 0, 0, 1);
119 glDisable(GL_DEPTH_TEST
);
122 glEnable(GL_POLYGON_SMOOTH
);
123 glEnable(GL_LINE_SMOOTH
);
126 glTranslatef(2.5, 0, 0);
128 glRotatef(Zrot
, 0, 0, 1);
132 glDisable(GL_LINE_SMOOTH
);
133 glDisable(GL_POLYGON_SMOOTH
);
141 Reshape( int width
, int height
)
143 GLfloat ar
= (float) width
/ (float) height
;
144 glViewport( 0, 0, width
, height
);
145 glMatrixMode( GL_PROJECTION
);
147 glOrtho(-2.0*ar
, 2.0*ar
, -2.0, 2.0, -1.0, 1.0);
148 glMatrixMode( GL_MODELVIEW
);
156 Zrot
= 0.01 * glutGet(GLUT_ELAPSED_TIME
);
162 Key( unsigned char key
, int x
, int y
)
164 const GLfloat step
= 1.0;
176 Zrot
= (int) (Zrot
- step
);
179 Zrot
= (int) (Zrot
+ step
);
192 /* GLUT imposes the four samples/pixel requirement */
194 glGetIntegerv(GL_SAMPLES_ARB
, &s
);
195 if (!glutExtensionSupported("GL_ARB_multisample") || s
< 1) {
196 printf("Warning: multisample antialiasing not supported.\n");
197 HaveMultisample
= GL_FALSE
;
199 printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER
));
200 printf("GL_SAMPLES_ARB = %d\n", s
);
202 glBlendFunc(GL_SRC_ALPHA
, GL_ONE
);
203 glBlendFunc(GL_SRC_ALPHA
, GL_ONE_MINUS_SRC_ALPHA
);
204 glBlendFunc(GL_SRC_ALPHA_SATURATE
, GL_ONE
);
206 glGetIntegerv(GL_MULTISAMPLE_ARB
, &s
);
207 printf("GL_MULTISAMPLE_ARB = %d\n", s
);
212 main( int argc
, char *argv
[] )
214 glutInit( &argc
, argv
);
215 glutInitWindowPosition( 0, 0 );
216 glutInitWindowSize( 600, 300 );
217 glutInitDisplayMode( GLUT_RGB
| GLUT_ALPHA
| GLUT_DOUBLE
|
218 GLUT_DEPTH
| GLUT_MULTISAMPLE
);
219 glutCreateWindow(argv
[0]);
220 glutReshapeFunc( Reshape
);
221 glutKeyboardFunc( Key
);
222 glutDisplayFunc( Display
);
224 glutIdleFunc( Idle
);