From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 14 Mar 2008 17:35:57 +0000 (-0600)
Subject: mesa: call glColorMask(1,1,1,1) before glClear()
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=14150bc8567cf424fc3a635a33f05213505681be;p=mesa.git

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

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

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);