diff options
| -rw-r--r-- | progs/trivial/tri-cull.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/progs/trivial/tri-cull.c b/progs/trivial/tri-cull.c index af26cb0b2be..2eead841155 100644 --- a/progs/trivial/tri-cull.c +++ b/progs/trivial/tri-cull.c @@ -29,6 +29,7 @@ static GLenum doubleBuffer; static GLint cullmode = 0; +static GLenum front = GL_CCW; /* GL default */ static void cull(void) { @@ -76,11 +77,16 @@ static void Reshape(int width, int height) static void Key(unsigned char key, int x, int y) { switch (key) { - case 27: - exit(1); + case 27: + exit(1); case 'c': cull(); break; + case 'f': + front = ((front == GL_CCW) ? GL_CW : GL_CCW); + glFrontFace(front); + printf("front face = %s\n", front == GL_CCW ? "GL_CCW" : "GL_CW"); + break; default: return; } @@ -92,7 +98,7 @@ static void Draw(void) glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_TRIANGLES); - /* back-facing */ + /* CCW / front-facing */ glColor3f(0,0,.7); glVertex3f(-0.1, -0.9, -30.0); glColor3f(.8,0,0); @@ -100,7 +106,7 @@ static void Draw(void) glColor3f(0,.9,0); glVertex3f(-0.9, 0.0, -30.0); - /* front-facing */ + /* CW / back-facing */ glColor3f(0,0,.7); glVertex3f( 0.1, -0.9, -30.0); glColor3f(.8,0,0); |