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i965/gen6: Upload all the clip viewports 

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2015-05-06 17:34:27 +12:00
parent 0374159b0c
commit 2a8835d485
1 changed files with 21 additions and 19 deletions
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40
src/mesa/drivers/dri/i965/gen6_viewport_state.c
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@ -42,27 +42,29 @@ gen6_upload_clip_vp(struct brw_context *brw)
struct brw_clipper_viewport *vp;
vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE,
sizeof(*vp), 32, &brw->clip.vp_offset);
sizeof(*vp) * ctx->Const.MaxViewports, 32, &brw->clip.vp_offset);
/* According to the "Vertex X,Y Clamping and Quantization" section of the
* Strips and Fans documentation, objects must not have a screen-space
* extents of over 8192 pixels, or they may be mis-rasterized. The maximum
* screen space coordinates of a small object may larger, but we have no
* way to enforce the object size other than through clipping.
*
* If you're surprised that we set clip to -gbx to +gbx and it seems like
* we'll end up with 16384 wide, note that for a 8192-wide render target,
* we'll end up with a normal (-1, 1) clip volume that just covers the
* drawable.
*/
const float maximum_post_clamp_delta = 8192;
float gbx = maximum_post_clamp_delta / ctx->ViewportArray[0].Width;
float gby = maximum_post_clamp_delta / ctx->ViewportArray[0].Height;
for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
/* According to the "Vertex X,Y Clamping and Quantization" section of the
* Strips and Fans documentation, objects must not have a screen-space
* extents of over 8192 pixels, or they may be mis-rasterized. The maximum
* screen space coordinates of a small object may larger, but we have no
* way to enforce the object size other than through clipping.
*
* If you're surprised that we set clip to -gbx to +gbx and it seems like
* we'll end up with 16384 wide, note that for a 8192-wide render target,
* we'll end up with a normal (-1, 1) clip volume that just covers the
* drawable.
*/
const float maximum_post_clamp_delta = 8192;
float gbx = maximum_post_clamp_delta / ctx->ViewportArray[i].Width;
float gby = maximum_post_clamp_delta / ctx->ViewportArray[i].Height;
vp->xmin = -gbx;
vp->xmax = gbx;
vp->ymin = -gby;
vp->ymax = gby;
vp[i].xmin = -gbx;
vp[i].xmax = gbx;
vp[i].ymin = -gby;
vp[i].ymax = gby;
}
brw->ctx.NewDriverState |= BRW_NEW_CLIP_VP;
}