On Fri, 2019-02-01 at 15:33 -0600, Jason Ekstrand wrote:
> On Fri, Feb 1, 2019 at 10:14 AM Juan A. Suarez Romero <jasua...@igalia.com>
> wrote:
> > This can happen when we record a VkCmdDraw in a secondary buffer that
> > was created inheriting from the primary buffer, but with the framebuffer
> > set to NULL in the VkCommandBufferInheritanceInfo.
> >
> > CC: Jason Ekstrand <ja...@jlekstrand.net>
> > ---
> > src/intel/vulkan/gen7_cmd_buffer.c | 13 +++++++++++--
> > 1 file changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/src/intel/vulkan/gen7_cmd_buffer.c
> > b/src/intel/vulkan/gen7_cmd_buffer.c
> > index 352892aee33..fe1a47f6ce6 100644
> > --- a/src/intel/vulkan/gen7_cmd_buffer.c
> > +++ b/src/intel/vulkan/gen7_cmd_buffer.c
> > @@ -70,12 +70,21 @@ gen7_cmd_buffer_emit_scissor(struct anv_cmd_buffer
> > *cmd_buffer)
> > };
> >
> > const int max = 0xffff;
> > +
> > + uint32_t height = 0;
> > + uint32_t width = 0;
> > +
> > + if (fb) {
> > + height = fb->height;
> > + width = fb->width;
> > + }
> > +
> > struct GEN7_SCISSOR_RECT scissor = {
> > /* Do this math using int64_t so overflow gets clamped correctly.
> > */
> > .ScissorRectangleYMin = clamp_int64(s->offset.y, 0, max),
> > .ScissorRectangleXMin = clamp_int64(s->offset.x, 0, max),
> > - .ScissorRectangleYMax = clamp_int64((uint64_t) s->offset.y +
> > s->extent.height - 1, 0, fb->height - 1),
> > - .ScissorRectangleXMax = clamp_int64((uint64_t) s->offset.x +
> > s->extent.width - 1, 0, fb->width - 1)
> > + .ScissorRectangleYMax = clamp_int64((uint64_t) s->offset.y +
> > s->extent.height - 1, 0, height - 1),
> > + .ScissorRectangleXMax = clamp_int64((uint64_t) s->offset.x +
> > s->extent.width - 1, 0, width - 1)
>
> If fb == NULL, won't width/height be 0 and this be -1 and we end up clamping
> to -1? I think we want to rather make the clamp conditional on having the
> framebuffer.
>
Right. And as ScissorRectangle(X/Y)Max is an uint value, its value would be
MAX_UINT.
I think as we do not know the framebuffer size (which will be know later, IIUC),
we are emitting the scissor for the full rectangle.
> --Jason
>
> > };
> >
> > if (s->extent.width <= 0 || s->extent.height <= 0) {
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