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authorMarek Olšák <maraeo@gmail.com>2010-12-02 20:39:59 +0100
committerMarek Olšák <maraeo@gmail.com>2010-12-03 05:56:40 +0100
commitd531f9c2f5c78468d913fc509b223760ac1c1124 (patch)
treecbd023be1ac512982e2fcf8bcb89fcc9f9e5e070 /src/gallium/drivers
parent6a46fce14f38adf72925842edf9829c00d1ee800 (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>
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