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anv: Set viewport extents correctly when height is negative 

As per VK_KHR_maintenance1, setting a negative height in the viewport
can be used to get flipped coordinates.  This is, aparently, very useful
when porting D3D apps to Vulkan.  All we need to do to support this is
to make sure we actually set the min and max correctly.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
This commit is contained in:
Jason Ekstrand 2017-01-20 17:30:51 -08:00
parent 045f38a507
commit 5edcc96bf6
1 changed files with 2 additions and 2 deletions
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4
src/intel/vulkan/gen8_cmd_buffer.c
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@ -59,8 +59,8 @@ gen8_cmd_buffer_emit_viewport(struct anv_cmd_buffer *cmd_buffer)
.YMaxClipGuardband = 1.0f,
.XMinViewPort = vp->x,
.XMaxViewPort = vp->x + vp->width - 1,
.YMinViewPort = vp->y,
.YMaxViewPort = vp->y + vp->height - 1,
.YMinViewPort = MIN2(vp->y, vp->y + vp->height),
.YMaxViewPort = MAX2(vp->y, vp->y + vp->height) - 1,
};
GENX(SF_CLIP_VIEWPORT_pack)(NULL, sf_clip_state.map + i * 64,