If the sampler object has been deleted on another context, an
alternative context may reference the old sampler. So ensure the sampler
object still exists.
Signed-off-by: Alan Hourihane <al...@vmware.com>
---
src/mesa/main/get.c | 12 +++++++++++-
src/mesa/main/samplerobj.c | 2 +-
src/mesa/main/samplerobj.h | 2 ++
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index 2399f9c..c627dd6 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -34,6 +34,7 @@
#include "state.h"
#include "texcompress.h"
#include "framebuffer.h"
+#include "samplerobj.h"
/* This is a table driven implemetation of the glGet*v() functions.
* The basic idea is that most getters just look up an int somewhere
@@ -827,7 +828,16 @@ find_custom_value(struct gl_context *ctx, const
struct valu
e_desc *d, union valu
{
struct gl_sampler_object *samp =
ctx->Texture.Unit[ctx->Texture.CurrentUnit].Sampler;
- v->value_int = samp ? samp->Name : 0;
+
+ /*
+ * The sampler object may have been deleted on another context,
+ * so we try to lookup the sampler object before returning it's Name.
+ */
+ if (samp && _mesa_lookup_samplerobj(ctx, samp->Name)) {
+ v->value_int = samp->Name;
+ } else {
+ v->value_int = 0;
+ }
}
break;
/* GL_ARB_uniform_buffer_object */
diff --git a/src/mesa/main/samplerobj.c b/src/mesa/main/samplerobj.c
index 4664cc3..5cff329 100644
--- a/src/mesa/main/samplerobj.c
+++ b/src/mesa/main/samplerobj.c
@@ -40,7 +40,7 @@
#include "main/samplerobj.h"
-static struct gl_sampler_object *
+struct gl_sampler_object *
_mesa_lookup_samplerobj(struct gl_context *ctx, GLuint name)
{
if (name == 0)
diff --git a/src/mesa/main/samplerobj.h b/src/mesa/main/samplerobj.h
index 3114257..69e3899 100644
--- a/src/mesa/main/samplerobj.h
+++ b/src/mesa/main/samplerobj.h
@@ -62,6 +62,8 @@ _mesa_reference_sampler_object(struct gl_context *ctx,
_mesa_reference_sampler_object_(ctx, ptr, samp);
}
+extern struct gl_sampler_object *
+_mesa_lookup_samplerobj(struct gl_context *ctx, GLuint name);
extern struct gl_sampler_object *
_mesa_new_sampler_object(struct gl_context *ctx, GLuint name);
--
1.7.8.6
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