commit 14150bc8567cf424fc3a635a33f05213505681be
author Brian Paul <brian.paul@tungstengraphics.com> Fri Mar 14 11:35:57 2008 -0600
committer Brian Paul <brian.paul@tungstengraphics.com> Fri Mar 14 11:35:57 2008 -0600
tree 94c5059247e4ff9d4de3ded9b95407f997cf0f0e
parent 9de9e1fe8c3f87fe672aed074348f07107fa3cec

mesa: call glColorMask(1,1,1,1) before glClear()

Without this, second and subsequent redraws rendered incorrectly.
Plus comments.

progs/trivial/tri-mask-tri.c

diff --git a/progs/trivial/tri-mask-tri.c b/progs/trivial/tri-mask-tri.c
index 96a1ea7..38ecd20 100644
--- a/progs/trivial/tri-mask-tri.c
+++ b/progs/trivial/tri-mask-tri.c
@@ -70,8 +70,11 @@
 
 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 @@
 
    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);