[Mesa-dev] [PATCH] dri3_glx.c: Pass NULL DRI drawables into driver for None GLX drawables

[Xiong Zhang]

GLX_ARB_create_context spec says:
If either <draw> or <read> are not a valid GLX drawable, a GLXBadDrawable
error is generated, unless <draw> and <read> are both None and the OpenGL
version supported by <ctx> is 3.0 or greater.

So when both <draw> and <read> are None, it could pass NULL drawable into
driver instead of returing GLXBadDrawable.

https://bugs.freedesktop.org/show_bug.cgi?id=79629
Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
---
 src/glx/dri3_glx.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
index 1ddc723..9cd0aab 100644
--- a/src/glx/dri3_glx.c
+++ b/src/glx/dri3_glx.c
@@ -133,17 +133,24 @@ dri3_bind_context(struct glx_context *context, struct glx_context *old,
    struct dri3_context *pcp = (struct dri3_context *) context;
    struct dri3_screen *psc = (struct dri3_screen *) pcp->base.psc;
    struct dri3_drawable *pdraw, *pread;
+   __DRIdrawable *dri_draw = NULL, *dri_read = NULL;
 
    pdraw = (struct dri3_drawable *) driFetchDrawable(context, draw);
    pread = (struct dri3_drawable *) driFetchDrawable(context, read);
 
    driReleaseDrawables(&pcp->base);
 
-   if (pdraw == NULL || pread == NULL)
+   if ((pdraw == NULL && draw != None) ||
+		(pread == NULL && read != None))
       return GLXBadDrawable;
 
-   if (!(*psc->core->bindContext) (pcp->driContext,
-                                   pdraw->driDrawable, pread->driDrawable))
+   if (pdraw)
+	   dri_draw = pdraw->driDrawable;
+
+   if (pread)
+	   dri_read = pread->driDrawable;
+
+   if (!(*psc->core->bindContext) (pcp->driContext, dri_draw, dri_read))
       return GLXBadContext;
 
    return Success;
-- 
2.1.4