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meta/blit: Save and restore the sampler using gl_sampler_object instead of GL API object handle 

Some meta operations can be called recursively.  Future changes (the
"Don't pollute the ... namespace" changes) will cause objects with
invalid names to be used.  If a nested meta operation tries to restore
an object named 0xDEADBEEF, it will fail.

v2: Add a comment explaining why samp_obj_save is set to NULL in
_mesa_meta_fb_tex_blit_begin.  This came out of review feedback from
Jason.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Ian Romanick 2015-11-10 18:46:12 -08:00
parent d796b491cc
commit 533320e4d1
2 changed files with 15 additions and 5 deletions
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3
src/mesa/drivers/common/meta.h
View File

@ -310,7 +310,8 @@ struct fb_tex_blit_state
{
GLint baseLevelSave, maxLevelSave;
struct gl_sampler_object *samp_obj;
GLuint samplerSave, stencilSamplingSave;
struct gl_sampler_object *samp_obj_save;
GLuint stencilSamplingSave;
GLuint tempTex;
};

17
src/mesa/drivers/common/meta_blit.c
View File

@ -810,9 +810,17 @@ void
_mesa_meta_fb_tex_blit_begin(const struct gl_context *ctx,
struct fb_tex_blit_state *blit)
{
blit->samplerSave =
ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler ?
ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler->Name : 0;
/* None of the existing callers preinitialize fb_tex_blit_state to zeros,
* and both use stack variables. If samp_obj_save is not NULL,
* _mesa_reference_sampler_object will try to dereference it. Leaving
* random garbage in samp_obj_save can only lead to crashes.
*
* Since the state isn't persistent across calls, we won't catch ref
* counting problems.
*/
blit->samp_obj_save = NULL;
_mesa_reference_sampler_object(ctx, &blit->samp_obj_save,
ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler);
blit->tempTex = 0;
}
@ -838,7 +846,8 @@ _mesa_meta_fb_tex_blit_end(struct gl_context *ctx, GLenum target,
}
}
_mesa_BindSampler(ctx->Texture.CurrentUnit, blit->samplerSave);
_mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, blit->samp_obj_save);
_mesa_reference_sampler_object(ctx, &blit->samp_obj_save, NULL);
_mesa_DeleteSamplers(1, &blit->samp_obj->Name);
blit->samp_obj = NULL;