Mesa (master): intel: Request DRI2 buffers for separate stencil and hiz
Chad Versace
chadversary at kemper.freedesktop.org
Wed Jun 8 17:07:54 UTC 2011
Module: Mesa
Branch: master
Commit: aea2236af60aee329e6ea73a41f2410d8eacc7b6
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=aea2236af60aee329e6ea73a41f2410d8eacc7b6
Author: Chad Versace <chad at chad-versace.us>
Date: Fri Jun 3 16:33:32 2011 -0700
intel: Request DRI2 buffers for separate stencil and hiz
When it is sensible to do so,
1) intelCreateBuffer() now attaches separate depth and stencil
buffers
to the framebuffer it creates.
2) intel_update_renderbuffers() requests for the framebuffer
a separate stencil buffer (DRI2BufferStencil).
The criteria for "sensible" is:
- The GLX config has nonzero depth and stencil bits.
- The hardware supports separate stencil.
- The X driver supports separate stencil, or its support has not yet
been determined.
If the hardware supports hiz too, then intel_update_renderbuffers()
also requests DRI2BufferHiz.
If after requesting DRI2BufferStencil we determine that X driver did not
actually support separate stencil, we clean up the mistake and never ask
for DRI2BufferStencil again.
CC: Ian Romanick <idr at freedesktop.org>
CC: Kristian Høgsberg <krh at bitplanet.net>
Acked-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Signed-off-by: Chad Versace <chad at chad-versace.us>
---
src/mesa/drivers/dri/intel/intel_context.c | 428 +++++++++++++++++++++++++++-
src/mesa/drivers/dri/intel/intel_screen.c | 28 ++-
src/mesa/drivers/dri/intel/intel_screen.h | 2 -
3 files changed, 444 insertions(+), 14 deletions(-)
diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 3460e67..0c2ba41 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -33,6 +33,7 @@
#include "main/framebuffer.h"
#include "main/imports.h"
#include "main/points.h"
+#include "main/renderbuffer.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
@@ -240,6 +241,26 @@ intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
struct intel_renderbuffer *rb,
const char *buffer_name);
+static void
+intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer **buffers,
+ unsigned **attachments,
+ int *count);
+
+static void
+intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer *buffer,
+ struct intel_renderbuffer *rb,
+ const char *buffer_name);
+static void
+intel_verify_dri2_has_hiz(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer **buffers,
+ unsigned **attachments,
+ int *count);
+
void
intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
{
@@ -247,9 +268,19 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
struct intel_renderbuffer *rb;
struct intel_context *intel = context->driverPrivate;
__DRIbuffer *buffers = NULL;
+ unsigned *attachments = NULL;
int i, count;
const char *region_name;
+ bool try_separate_stencil =
+ intel->has_separate_stencil &&
+ intel->intelScreen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE &&
+ intel->intelScreen->driScrnPriv->dri2.loader != NULL &&
+ intel->intelScreen->driScrnPriv->dri2.loader->base.version > 2 &&
+ intel->intelScreen->driScrnPriv->dri2.loader->getBuffersWithFormat != NULL;
+
+ assert(!intel->must_use_separate_stencil || try_separate_stencil);
+
/* If we're rendering to the fake front buffer, make sure all the
* pending drawing has landed on the real front buffer. Otherwise
* when we eventually get to DRI2GetBuffersWithFormat the stale
@@ -269,12 +300,17 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
if (unlikely(INTEL_DEBUG & DEBUG_DRI))
fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
+ if (try_separate_stencil) {
+ intel_query_dri2_buffers_with_separate_stencil(intel, drawable, &buffers,
+ &attachments, &count);
+ } else {
+ intel_query_dri2_buffers_no_separate_stencil(intel, drawable, &buffers,
+ &count);
+ }
+
if (buffers == NULL)
return;
- intel_query_dri2_buffers_no_separate_stencil(intel, drawable, &buffers,
- &count);
-
drawable->x = 0;
drawable->y = 0;
drawable->backX = 0;
@@ -312,6 +348,12 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
region_name = "dri2 depth buffer";
break;
+ case __DRI_BUFFER_HIZ:
+ /* The hiz region resides in the depth renderbuffer. */
+ rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
+ region_name = "dri2 hiz buffer";
+ break;
+
case __DRI_BUFFER_DEPTH_STENCIL:
rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
region_name = "dri2 depth / stencil buffer";
@@ -330,11 +372,26 @@ intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
return;
}
- intel_process_dri2_buffer_no_separate_stencil(intel, drawable,
- &buffers[i], rb,
- region_name);
+ if (try_separate_stencil) {
+ intel_process_dri2_buffer_with_separate_stencil(intel, drawable,
+ &buffers[i], rb,
+ region_name);
+ } else {
+ intel_process_dri2_buffer_no_separate_stencil(intel, drawable,
+ &buffers[i], rb,
+ region_name);
+ }
+ }
+
+ if (try_separate_stencil
+ && intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN) {
+ intel_verify_dri2_has_hiz(intel, drawable, &buffers, &attachments,
+ &count);
}
+ if (attachments)
+ free(attachments);
+
driUpdateFramebufferSize(&intel->ctx, drawable);
}
@@ -1124,3 +1181,362 @@ intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
intel_renderbuffer_set_region(intel, stencil_rb, region);
}
}
+
+/**
+ * \brief Query DRI2 to obtain a DRIdrawable's buffers.
+ *
+ * To determine which DRI buffers to request, examine the renderbuffers
+ * attached to the drawable's framebuffer. Then request the buffers with
+ * DRI2GetBuffersWithFormat().
+ *
+ * This is called from intel_update_renderbuffers(). It is used when 1) the
+ * hardware supports separate stencil and 2) the X driver's separate stencil
+ * support has been verified to work or is still unknown.
+ *
+ * \param drawable Drawable whose buffers are queried.
+ * \param buffers [out] List of buffers returned by DRI2 query.
+ * \param buffer_count [out] Number of buffers returned.
+ * \param attachments [out] List of pairs (attachment_point, bits_per_pixel)
+ * that were submitted in the DRI2 query. Number of pairs
+ * is same as buffer_count.
+ *
+ * \see intel_update_renderbuffers()
+ * \see DRI2GetBuffersWithFormat()
+ * \see enum intel_dri2_has_hiz
+ */
+static void
+intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer **buffers,
+ unsigned **attachments,
+ int *count)
+{
+ assert(intel->has_separate_stencil);
+
+ __DRIscreen *screen = intel->intelScreen->driScrnPriv;
+ struct gl_framebuffer *fb = drawable->driverPrivate;
+
+ const int max_attachments = 5;
+ int i = 0;
+
+ *attachments = calloc(2 * max_attachments, sizeof(unsigned));
+ if (!*attachments) {
+ *buffers = NULL;
+ *count = 0;
+ return;
+ }
+
+ struct intel_renderbuffer *front_rb;
+ struct intel_renderbuffer *back_rb;
+ struct intel_renderbuffer *depth_rb;
+ struct intel_renderbuffer *stencil_rb;
+
+ front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
+ back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
+ depth_rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
+ stencil_rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
+
+ if ((intel->is_front_buffer_rendering ||
+ intel->is_front_buffer_reading ||
+ !back_rb) && front_rb) {
+ (*attachments)[i++] = __DRI_BUFFER_FRONT_LEFT;
+ (*attachments)[i++] = intel_bits_per_pixel(front_rb);
+ }
+
+ if (back_rb) {
+ (*attachments)[i++] = __DRI_BUFFER_BACK_LEFT;
+ (*attachments)[i++] = intel_bits_per_pixel(back_rb);
+ }
+
+ /*
+ * We request a separate stencil buffer, and perhaps a hiz buffer too, even
+ * if we do not yet know if the X driver supports it. See the comments for
+ * 'enum intel_dri2_has_hiz'.
+ */
+
+ if (depth_rb) {
+ (*attachments)[i++] = __DRI_BUFFER_DEPTH;
+ (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
+
+ if (intel->vtbl.is_hiz_depth_format(intel, depth_rb->Base.Format)) {
+ /* Depth and hiz buffer have same bpp. */
+ (*attachments)[i++] = __DRI_BUFFER_HIZ;
+ (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
+ }
+ }
+
+ if (stencil_rb) {
+ assert(stencil_rb->Base.Format == MESA_FORMAT_S8);
+ (*attachments)[i++] = __DRI_BUFFER_STENCIL;
+ (*attachments)[i++] = intel_bits_per_pixel(stencil_rb);
+ }
+
+ assert(i <= 2 * max_attachments);
+
+ *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
+ &drawable->w,
+ &drawable->h,
+ *attachments, i / 2,
+ count,
+ drawable->loaderPrivate);
+
+ if (!*buffers) {
+ free(*attachments);
+ *attachments = NULL;
+ *count = 0;
+ }
+}
+
+/**
+ * \brief Assign a DRI buffer's DRM region to a renderbuffer.
+ *
+ * This is called from intel_update_renderbuffers(). It is used when 1) the
+ * hardware supports separate stencil and 2) the X driver's separate stencil
+ * support has been verified to work or is still unknown.
+ *
+ * \par Note:
+ * DRI buffers whose attachment point is DRI2BufferStencil or DRI2BufferHiz
+ * are handled as special cases.
+ *
+ * \param buffer_name is a human readable name, such as "dri2 front buffer",
+ * that is passed to intel_region_alloc_for_handle().
+ *
+ * \see intel_update_renderbuffers()
+ * \see intel_region_alloc_for_handle()
+ * \see intel_renderbuffer_set_region()
+ * \see enum intel_dri2_has_hiz
+ */
+static void
+intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer *buffer,
+ struct intel_renderbuffer *rb,
+ const char *buffer_name)
+{
+ assert(intel->has_separate_stencil);
+ assert(buffer->attachment != __DRI_BUFFER_DEPTH_STENCIL);
+
+ if (!rb)
+ return;
+
+ /* If the renderbuffer's and DRIbuffer's regions match, then continue. */
+ if ((buffer->attachment != __DRI_BUFFER_HIZ &&
+ rb->region &&
+ rb->region->name == buffer->name) ||
+ (buffer->attachment == __DRI_BUFFER_HIZ &&
+ rb->hiz_region &&
+ rb->hiz_region->name == buffer->name)) {
+ return;
+ }
+
+ if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
+ fprintf(stderr,
+ "attaching buffer %d, at %d, cpp %d, pitch %d\n",
+ buffer->name, buffer->attachment,
+ buffer->cpp, buffer->pitch);
+ }
+
+ /*
+ * The stencil buffer has quirky pitch requirements. From Section
+ * 2.11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
+ * The pitch must be set to 2x the value computed based on width, as
+ * the stencil buffer is stored with two rows interleaved.
+ * If we neglect to double the pitch, then drm_intel_gem_bo_map_gtt()
+ * maps the memory incorrectly.
+ *
+ * To satisfy the pitch requirement, the X driver hackishly allocated
+ * the gem buffer with bpp doubled and height halved. So buffer->cpp is
+ * correct, but drawable->height is not.
+ */
+ int buffer_height = drawable->h;
+ if (buffer->attachment == __DRI_BUFFER_STENCIL) {
+ buffer_height /= 2;
+ }
+
+ struct intel_region *region =
+ intel_region_alloc_for_handle(intel->intelScreen,
+ buffer->cpp,
+ drawable->w,
+ buffer_height,
+ buffer->pitch / buffer->cpp,
+ buffer->name,
+ buffer_name);
+
+ if (buffer->attachment == __DRI_BUFFER_HIZ) {
+ intel_renderbuffer_set_hiz_region(intel, rb, region);
+ } else {
+ intel_renderbuffer_set_region(intel, rb, region);
+ }
+
+ intel_region_release(®ion);
+}
+
+/**
+ * \brief Verify that the X driver supports hiz and separate stencil.
+ *
+ * This implements the cleanup stage of the handshake described in the
+ * comments for 'enum intel_dri2_has_hiz'.
+ *
+ * This should be called from intel_update_renderbuffers() after 1) the
+ * DRIdrawable has been queried for its buffers via DRI2GetBuffersWithFormat()
+ * and 2) the DRM region of each returned DRIbuffer has been assigned to the
+ * appropriate intel_renderbuffer. Furthermore, this should be called *only*
+ * when 1) intel_update_renderbuffers() tried to used the X driver's separate
+ * stencil functionality and 2) it has not yet been determined if the X driver
+ * supports separate stencil.
+ *
+ * If we determine that the X driver does have support, then we set
+ * intel_screen.dri2_has_hiz to true and return.
+ *
+ * If we determine that the X driver lacks support, and we requested
+ * a DRI2BufferDepth and DRI2BufferStencil, then we must remedy the mistake by
+ * taking the following actions:
+ * 1. Discard the framebuffer's stencil and depth renderbuffers.
+ * 2. Create a combined depth/stencil renderbuffer and attach
+ * it to the framebuffer's depth and stencil attachment points.
+ * 3. Query the drawable for a new set of buffers, which consists of the
+ * originally requested set plus DRI2BufferDepthStencil.
+ * 4. Assign the DRI2BufferDepthStencil's DRM region to the new
+ * depth/stencil renderbuffer.
+ *
+ * \pre intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN
+ *
+ * \param drawable Drawable whose buffers were queried.
+ *
+ * \param buffers [in/out] As input, the buffer list returned by the
+ * original DRI2 query. As output, the current buffer
+ * list, which may have been altered by a new DRI2 query.
+ *
+ * \param attachments [in/out] As input, the attachment list submitted
+ * in the original DRI2 query. As output, the attachment
+ * list that was submitted in the DRI2 query that
+ * obtained the current buffer list, as returned in the
+ * output parameter \c buffers. (Note: If no new query
+ * was made, then the list remains unaltered).
+ *
+ * \param count [out] Number of buffers in the current buffer list, as
+ * returned in the output parameter \c buffers.
+ *
+ * \see enum intel_dri2_has_hiz
+ * \see struct intel_screen::dri2_has_hiz
+ * \see intel_update_renderbuffers
+ */
+static void
+intel_verify_dri2_has_hiz(struct intel_context *intel,
+ __DRIdrawable *drawable,
+ __DRIbuffer **buffers,
+ unsigned **attachments,
+ int *count)
+{
+ assert(intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN);
+
+ struct gl_framebuffer *fb = drawable->driverPrivate;
+ struct intel_renderbuffer *stencil_rb =
+ intel_get_renderbuffer(fb, BUFFER_STENCIL);
+
+ if (stencil_rb) {
+ /*
+ * We requested a DRI2BufferStencil without knowing if the X driver
+ * supports it. Now, check if X handled the request correctly and clean
+ * up if it did not. (See comments for 'enum intel_dri2_has_hiz').
+ */
+ struct intel_renderbuffer *depth_rb =
+ intel_get_renderbuffer(fb, BUFFER_DEPTH);
+ assert(stencil_rb->Base.Format == MESA_FORMAT_S8);
+ assert(depth_rb && depth_rb->Base.Format == MESA_FORMAT_X8_Z24);
+
+ if (stencil_rb->region->tiling == I915_TILING_Y) {
+ intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_TRUE;
+ return;
+ } else {
+ /*
+ * Oops... the screen doesn't support separate stencil. Discard the
+ * separate depth and stencil buffers and replace them with
+ * a combined depth/stencil buffer. Discard the hiz buffer too.
+ */
+ intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_FALSE;
+
+ /* 1. Discard depth and stencil renderbuffers. */
+ _mesa_remove_renderbuffer(fb, BUFFER_DEPTH);
+ depth_rb = NULL;
+ _mesa_remove_renderbuffer(fb, BUFFER_STENCIL);
+ stencil_rb = NULL;
+
+ /* 2. Create new depth/stencil renderbuffer. */
+ struct intel_renderbuffer *depth_stencil_rb =
+ intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
+ _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depth_stencil_rb->Base);
+ _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &depth_stencil_rb->Base);
+
+ /* 3. Append DRI2BufferDepthStencil to attachment list. */
+ int old_count = *count;
+ unsigned int *old_attachments = *attachments;
+ *count = old_count + 1;
+ *attachments = malloc(2 * (*count) * sizeof(unsigned));
+ memcpy(*attachments, old_attachments, 2 * old_count * sizeof(unsigned));
+ free(old_attachments);
+ (*attachments)[2 * old_count + 0] = __DRI_BUFFER_DEPTH_STENCIL;
+ (*attachments)[2 * old_count + 1] = intel_bits_per_pixel(depth_stencil_rb);
+
+ /* 4. Request new set of DRI2 attachments. */
+ __DRIscreen *screen = intel->intelScreen->driScrnPriv;
+ *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
+ &drawable->w,
+ &drawable->h,
+ *attachments,
+ *count,
+ count,
+ drawable->loaderPrivate);
+ if (!*buffers)
+ return;
+
+ /*
+ * I don't know how to recover from the failure assertion below.
+ * Rather than fail gradually and unexpectedly, we should just die
+ * now.
+ */
+ assert(*count == old_count + 1);
+
+ /* 5. Assign the DRI buffer's DRM region to the its renderbuffers. */
+ __DRIbuffer *depth_stencil_buffer = NULL;
+ for (int i = 0; i < *count; ++i) {
+ if ((*buffers)[i].attachment == __DRI_BUFFER_DEPTH_STENCIL) {
+ depth_stencil_buffer = &(*buffers)[i];
+ break;
+ }
+ }
+ struct intel_region *region =
+ intel_region_alloc_for_handle(intel->intelScreen,
+ depth_stencil_buffer->cpp,
+ drawable->w,
+ drawable->h,
+ depth_stencil_buffer->pitch
+ / depth_stencil_buffer->cpp,
+ depth_stencil_buffer->name,
+ "dri2 depth / stencil buffer");
+ intel_renderbuffer_set_region(intel,
+ intel_get_renderbuffer(fb, BUFFER_DEPTH),
+ region);
+ intel_renderbuffer_set_region(intel,
+ intel_get_renderbuffer(fb, BUFFER_STENCIL),
+ region);
+ intel_region_release(®ion);
+ }
+ }
+
+ if (intel_framebuffer_has_hiz(fb)) {
+ /*
+ * In the future, the driver may advertise a GL config with hiz
+ * compatible depth bits and 0 stencil bits (for example, when the
+ * driver gains support for float32 depth buffers). When that day comes,
+ * here we need to verify that the X driver does in fact support hiz and
+ * clean up if it doesn't.
+ *
+ * Presently, however, no verification or clean up is necessary, and
+ * execution should not reach here. If the framebuffer still has a hiz
+ * region, then we have already set dri2_has_hiz to true after
+ * confirming above that the stencil buffer is Y tiled.
+ */
+ assert(0);
+ }
+}
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index 21dc8dc..e915ca0 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -359,6 +359,7 @@ intelCreateBuffer(__DRIscreen * driScrnPriv,
const struct gl_config * mesaVis, GLboolean isPixmap)
{
struct intel_renderbuffer *rb;
+ struct intel_screen *screen = (struct intel_screen*) driScrnPriv->private;
if (isPixmap) {
return GL_FALSE; /* not implemented */
@@ -396,12 +397,27 @@ intelCreateBuffer(__DRIscreen * driScrnPriv,
*/
if (mesaVis->depthBits == 24) {
assert(mesaVis->stencilBits == 8);
- /* combined depth/stencil buffer */
- struct intel_renderbuffer *depthStencilRb
- = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
- /* note: bind RB to two attachment points */
- _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthStencilRb->Base);
- _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &depthStencilRb->Base);
+
+ if (screen->hw_has_separate_stencil
+ && screen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE) {
+ /*
+ * Request a separate stencil buffer even if we do not yet know if
+ * the screen supports it. (See comments for
+ * enum intel_dri2_has_hiz).
+ */
+ rb = intel_create_renderbuffer(MESA_FORMAT_X8_Z24);
+ _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
+ rb = intel_create_renderbuffer(MESA_FORMAT_S8);
+ _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
+ } else {
+ /*
+ * Use combined depth/stencil. Note that the renderbuffer is
+ * attached to two attachment points.
+ */
+ rb = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
+ _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
+ _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
+ }
}
else if (mesaVis->depthBits == 16) {
assert(mesaVis->stencilBits == 0);
diff --git a/src/mesa/drivers/dri/intel/intel_screen.h b/src/mesa/drivers/dri/intel/intel_screen.h
index b4afae9..b2013af 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.h
+++ b/src/mesa/drivers/dri/intel/intel_screen.h
@@ -57,8 +57,6 @@
*
* How the handshake works
* -----------------------
- * (TODO: To be implemented on a future commit).
- *
* Initially, intel_screen.dri2_has_hiz is set to unknown. The first time the
* user requests a depth and stencil buffer, intelCreateBuffers() creates a
* framebuffer with separate depth and stencil attachments (with formats
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