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i965/gen7: Add R8_UINT stencil miptree copy for sampling

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For gen < 8, we can't sample from the stencil buffer, which is
required for the ARB_stencil_texturing extension. We'll make a copy of
the stencil data into a new texture that we can sample using the
R8_UINT surface type.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
This commit is contained in:
Jordan Justen 2016-06-11 16:21:36 -07:00
parent 91627d1956
commit 2a9c65a01d
2 changed files with 14 additions and 0 deletions
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2
src/mesa/drivers/dri/i965/intel_mipmap_tree.c
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@ -534,6 +534,7 @@ intel_miptree_create_layout(struct brw_context *brw,
intel_miptree_release(&mt);
return NULL;
}
mt->stencil_mt->r8stencil_needs_update = true;
/* Fix up the Z miptree format for how we're splitting out separate
* stencil. Gen7 expects there to be no stencil bits in its depth buffer.
@ -997,6 +998,7 @@ intel_miptree_release(struct intel_mipmap_tree **mt)
drm_intel_bo_unreference((*mt)->bo);
intel_miptree_release(&(*mt)->stencil_mt);
intel_miptree_release(&(*mt)->r8stencil_mt);
if ((*mt)->hiz_buf) {
if ((*mt)->hiz_buf->mt)
intel_miptree_release(&(*mt)->hiz_buf->mt);

12
src/mesa/drivers/dri/i965/intel_mipmap_tree.h
View file

@ -614,6 +614,18 @@ struct intel_mipmap_tree
*/
struct intel_mipmap_tree *stencil_mt;
/**
* \brief Stencil texturing miptree for sampling from a stencil texture
*
* Some hardware doesn't support sampling from the stencil texture as
* required by the GL_ARB_stencil_texturing extenion. To workaround this we
* blit the texture into a new texture that can be sampled.
*
* \see intel_update_r8stencil()
*/
struct intel_mipmap_tree *r8stencil_mt;
bool r8stencil_needs_update;
/**
* \brief MCS miptree.
*