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Problems with lines and depth test on ATY RV250

Title: Problems with lines and depth test on ATY RV250

Hi,

I have code which draws a white filled rectangle and on it a black cross.

My depth test is LEQUAL, and I’m drawing everything at depth 0 (2D drawing mostly).

The code looks something like this:

glColor3f (1, 1, 1);

glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

glBegin(GL_QUADS);

        DrawRectVertices(…);

glEnd();

glColor3f (0,0,0);

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

glBegin(GL_LINES);     

        DrawCrossVertices(…);

glEnd();

This works fine on all computers we have except those with ATY RV250 card. On these machines the cross in NOT seen.

Playing around with it I got it to be seen in 2 ways:

1)      disable the depth test completely.

2)      Remove the 2nd call to glPolygonMode which sets it to GL_LINE and stay with GL_FILL.

Since the same problem appeared in other places around our application I’m pretty convinced that using GL_LINE polygon mode somehow disrupts the depth test of objects at the same depth.

Does anyone have any ideas??

Thanx,

Yaron Tadmor

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