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authorIan Romanick <[email protected]>2015-11-09 19:10:48 -0800
committerIan Romanick <[email protected]>2016-01-11 15:38:03 -0800
commit963065b76cbc254f2fbc6be4e0491264aeaec4ce (patch)
tree662fff04d307d8ef5fd8afb17a44b21612bbfd80
parent533320e4d1367f8acb81dab6e1a15bbc3ebb2385 (diff)
meta/blit: Don't pollute the sampler object namespace in _mesa_meta_setup_sampler
tl;dr: For many types of GL object, we can *NEVER* use the Gen function. In OpenGL ES (all versions!) and OpenGL compatibility profile, applications don't have to call Gen functions. The GL spec is very clear about how you can mix-and-match generated names and non-generated names: you can use any name you want for a particular object type until you call the Gen function for that object type. Here's the problem scenario: - Application calls a meta function that generates a name. The first Gen will probably return 1. - Application decides to use the same name for an object of the same type without calling Gen. Many demo programs use names 1, 2, 3, etc. without calling Gen. - Application calls the meta function again, and the meta function replaces the data. The application's data is lost, and the app fails. Have fun debugging that. Signed-off-by: Ian Romanick <[email protected]> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92363 Reviewed-by: Jason Ekstrand <[email protected]>
-rw-r--r--src/mesa/drivers/common/meta_blit.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/src/mesa/drivers/common/meta_blit.c b/src/mesa/drivers/common/meta_blit.c
index 07bd7e5016a..78434cfdcfe 100644
--- a/src/mesa/drivers/common/meta_blit.c
+++ b/src/mesa/drivers/common/meta_blit.c
@@ -848,8 +848,7 @@ _mesa_meta_fb_tex_blit_end(struct gl_context *ctx, GLenum target,
_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;
+ _mesa_reference_sampler_object(ctx, &blit->samp_obj, NULL);
if (blit->tempTex)
_mesa_DeleteTextures(1, &blit->tempTex);
@@ -899,16 +898,14 @@ _mesa_meta_setup_sampler(struct gl_context *ctx,
const struct gl_texture_object *texObj,
GLenum target, GLenum filter, GLuint srcLevel)
{
- GLuint sampler;
struct gl_sampler_object *samp_obj;
GLenum tex_filter = (filter == GL_SCALED_RESOLVE_FASTEST_EXT ||
filter == GL_SCALED_RESOLVE_NICEST_EXT) ?
GL_NEAREST : filter;
- _mesa_GenSamplers(1, &sampler);
-
- samp_obj = _mesa_lookup_samplerobj(ctx, sampler);
- assert(samp_obj != NULL && samp_obj->Name == sampler);
+ samp_obj = ctx->Driver.NewSamplerObject(ctx, 0xDEADBEEF);
+ if (samp_obj == NULL)
+ return NULL;
_mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, samp_obj);
_mesa_set_sampler_filters(ctx, samp_obj, tex_filter, tex_filter);