diff options
Diffstat (limited to 'progs/trivial/tri-mask-tri.c')
| -rw-r--r-- | progs/trivial/tri-mask-tri.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/progs/trivial/tri-mask-tri.c b/progs/trivial/tri-mask-tri.c index 96a1ea7168a..38ecd20a739 100644 --- a/progs/trivial/tri-mask-tri.c +++ b/progs/trivial/tri-mask-tri.c @@ -70,8 +70,11 @@ static void Key(unsigned char key, int x, int y) static void Draw(void) { + glColorMask(1,1,1,1); + glClear(GL_COLOR_BUFFER_BIT); + /* right triangle: green */ glBegin(GL_TRIANGLES); glColor3f(0,1,0); glVertex3f( 0.9, -0.9, -30.0); @@ -81,6 +84,7 @@ static void Draw(void) glColorMask(1,0,1,0); + /* left triangle: white&mask: purple middle region: white */ glBegin(GL_TRIANGLES); glColor3f(1,1,1); glVertex3f(-0.9, -0.9, -30.0); |