From ae50157363e828a50b249743d3f0b83322a3bc3a Mon Sep 17 00:00:00 2001 From: Ian Romanick Date: Tue, 10 Nov 2015 16:33:02 -0800 Subject: [PATCH] meta/decompress: Don't pollute the sampler object namespace 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 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92363 Reviewed-by: Jason Ekstrand --- src/mesa/drivers/common/meta.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c index 385ea6449b8..8f93b25c56d 100644 --- a/src/mesa/drivers/common/meta.c +++ b/src/mesa/drivers/common/meta.c @@ -2986,8 +2986,7 @@ meta_decompress_cleanup(struct gl_context *ctx, _mesa_reference_buffer_object(ctx, &decompress->buf_obj, NULL); } - if (decompress->samp_obj != NULL) - _mesa_DeleteSamplers(1, &decompress->samp_obj->Name); + _mesa_reference_sampler_object(ctx, &decompress->samp_obj, NULL); memset(decompress, 0, sizeof(*decompress)); } @@ -3114,12 +3113,21 @@ decompress_texture_image(struct gl_context *ctx, } if (decompress->samp_obj == NULL) { - GLuint sampler; + decompress->samp_obj = ctx->Driver.NewSamplerObject(ctx, 0xDEADBEEF); + if (decompress->samp_obj == NULL) { + _mesa_meta_end(ctx); - _mesa_GenSamplers(1, &sampler); - - decompress->samp_obj = _mesa_lookup_samplerobj(ctx, sampler); - assert(decompress->samp_obj != NULL && decompress->samp_obj->Name == sampler); + /* This is a bit lazy. Flag out of memory, and then don't bother to + * clean up. Once out of memory is flagged, the only realistic next + * move is to destroy the context. That will trigger all the right + * clean up. + * + * Returning true prevents other GetTexImage methods from attempting + * anything since they will likely fail too. + */ + _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGetTexImage"); + return true; + } _mesa_bind_sampler(ctx, ctx->Texture.CurrentUnit, decompress->samp_obj); /* nearest filtering */