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author | Marek Olšák <maraeo@gmail.com> | 2010-12-02 20:39:59 +0100 |
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committer | Marek Olšák <maraeo@gmail.com> | 2010-12-03 05:56:40 +0100 |
commit | d531f9c2f5c78468d913fc509b223760ac1c1124 (patch) | |
tree | cbd023be1ac512982e2fcf8bcb89fcc9f9e5e070 /src/gallium/drivers/r300 | |
parent | 6a46fce14f38adf72925842edf9829c00d1ee800 (diff) |
mesa, st/mesa: fix gl_FragCoord with FBOs in Gallium
gl_FragCoord.y needs to be flipped upside down if a FBO is bound.
This fixes:
- piglit/fbo-fragcoord
- https://bugs.freedesktop.org/show_bug.cgi?id=29420
Here I add a new program state STATE_FB_WPOS_Y_TRANSFORM, which is set based
on whether a FBO is bound. The state contains a pair of transformations.
It can be either (XY=identity, ZW=transformY) if a FBO is bound,
or (XY=transformY, ZW=identity) otherwise, where identity = (1, 0),
transformY = (-1, height-1).
A classic driver (or st/mesa) may, based on some other state, choose whether
to use XY or ZW, thus negate the conditional "if (is a FBO bound) ...".
The reason for this is that a Gallium driver is allowed to only support WPOS
relative to either the lower left or the upper left corner, so we must flip
the Y axis accordingly again. (the "invert" parameter in emit_wpos_inversion)
NOTE: This is a candidate for the 7.9 branch.
Signed-off-by: Marek Olšák <maraeo@gmail.com>
Signed-off-by: Brian Paul <brianp@vmware.com>
Diffstat (limited to 'src/gallium/drivers/r300')
0 files changed, 0 insertions, 0 deletions