http://bugs.freedesktop.org/show_bug.cgi?id=13578
Summary: incorrect glClear with ati driver
Product: Mesa
Version: unspecified
Platform: x86-64 (AMD64)
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/X11
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AP [Radeon 9600]
mesa 7.0.1
xorg-ati 1:6.7.195
xorg 1:7.2
glClear ignore stencil mask while using xorg-ati driver (works fine with
fglrx).
gl specifically state that:
"The pixel ownership test, the scissor test,
dithering, and the buffer writemasks affect the operation of
glClear".
the following example demonstrate the problem. the expected rendering result is
the intersection of the
first two rectangles. with ati driver nothing gets rendered.
void draw(void)
{
glStencilMask(0xff);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glStencilFunc(GL_ALWAYS, 0x01, 0x01);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
glBegin(GL_POLYGON);
glVertex2f(0, 0);
glVertex2f(0, 100);
glVertex2f(100, 100);
glVertex2f(100, 0);
glEnd();
glStencilFunc(GL_ALWAYS, 0x01, 0x01);
glStencilOp(GL_INCR, GL_INCR, GL_INCR);
glBegin(GL_POLYGON);
glVertex2f(50, 50);
glVertex2f(50, 150);
glVertex2f(150, 150);
glVertex2f(150, 50);
glEnd();
glStencilMask(0x1);
glClear(GL_STENCIL_BUFFER_BIT);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glStencilFunc(GL_EQUAL, 0x02, 0x02);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glColor3f(1, 0, 0);
glBegin(GL_POLYGON);
glVertex2f(0, 0);
glVertex2f(0, 1000);
glVertex2f(1000, 1000);
glVertex2f(1000, 0);
glEnd();
glFlush();
}
static void init(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, 0, height, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0, 0, 0, 0);
glClearStencil(0);
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_ALWAYS, 0, 0);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
}
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