[Mesa-dev] [PATCH 1/3] i965: solve cubemap negative x/y/z faces buffer offset issue in dEQP.

[Xu, Randy]

Hi, Jason & Tapani

Thanks for your review, let me introduce the dEQP failure first.

In dEQP-EGL.functional.image.create.gles2_cubemap_negative_*_texture, 2D textures are generated from all 6 faces of a Cubemap texture (64x64), and then rendered through glDrawXXX.
In brw_miptree_get_vertical_slice_pitch, the mt->qpitch is counted as 144.
      return h0 + h1 + (brw->gen >= 7 ? 12 : 11) * mt->valign;                             // 64+32+12*4 = 144

Take the face negative_x for example, the total offset in bo is 144(y)*64(x)*4(bpp) = 36864.
It’s TILING_Y buffer, as the y (144) is not 32 aligned (mask_y = 31 from intel_region_get_tile_masks), the total bo offset is divided into two parts: 36864 =  32768 (offset 128*64*4) + 16(tile_y)*64*4
   case I915_TILING_Y:
      *mask_x = 128 / cpp - 1;
      *mask_y = 31;


Both the tile_y and offset are passed to texture2D in create_mt_for_dri_image, while the tile_y is not used to count the total offset in rendering path, that’s why I add this patch.
Please check and comment more.

Thanks,
Randy




From: Jason Ekstrand [mailto:jason at jlekstrand.net]
Sent: Tuesday, October 4, 2016 11:59 PM
To: Palli, Tapani <tapani.palli at intel.com>
Cc: Xu, Randy <randy.xu at intel.com>; mesa-dev at lists.freedesktop.org; Xu at freedesktop.org
Subject: Re: [Mesa-dev] [PATCH 1/3] i965: solve cubemap negative x/y/z faces buffer offset issue in dEQP.

On Tue, Oct 4, 2016 at 8:55 AM, Tapani Pälli <tapani.palli at intel.com<mailto:tapani.palli at intel.com>> wrote:
On 10/04/2016 06:09 PM, Jason Ekstrand wrote:
On Thu, Sep 29, 2016 at 11:27 PM, Xu,Randy <randy.xu at intel.com<mailto:randy.xu at intel.com>> wrote:
Add the miptree level/slice x/y_offset when count the surface offset
in brw_emit_surface_state. The surface offset has two parts, one is
from mt->offset, which should be 32 aligned in width/height for tiled
buffer; another is from mt->level[current_level].slice[current_slice].
x/y_offset.

This fix will solve 12 deqp failure
dEQP-EGL.functional.image.create.gles2_cubemap_negative_*_texture

Signed-off-by: Xu,Randy <randy.xu at intel.com<mailto:randy.xu at intel.com>>
---
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 61a4b94..3a5c573 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -85,7 +85,8 @@ brw_emit_surface_state(struct brw_context *brw,
                        unsigned read_domains, unsigned write_domains)
 {
    const struct surface_state_info ss_info = surface_state_infos[brw->gen];
-   uint32_t tile_x = 0, tile_y = 0;
+   uint32_t tile_x = mt->level[0].slice[0].x_offset;
+   uint32_t tile_y = mt->level[0].slice[0].y_offset;

This isn't correct.  First off, there are some fairly strict restrictions on what we can do with tile_x and tile_y and we can't just shove x/y_offset in there.  We need to use intel_miptree_get_tile_offsets to get both a byte offset and an intratile offset.  Second, we should already be taking slices into account for cube maps via base_array_layer where needed.
Unfortunately, I'm not 100% sure what the correct patch is without a bit more information about what the test is doing that causes a problem.

I did take a brief look and when running the set mentioned above (for example with ./deqp-egl --deqp-case=*EGL.functional.image.create.gles2_cubemap_negative_*_texture) what happens is that we never end up to the part of code calling intel_miptree_get_tile_offsets in that function (because surf.dim_layout != dim_layout condition does not trigger). This is just what I observed, should we just call intel_miptree_get_tile_offsets() unconditionally then?

No.  Very much no.  The intel_miptree_get_tile_offsets() stuff is a hack that lets us convert non-2D things to 2D things and it comes with piles of restrictions.



--Jason

    uint32_t offset = mt->offset;

    struct isl_surf surf;
--
2.7.4

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