commit c47b289972a6c5ca0e30ff5618418e5ca91bd1ec
author Török Edvin <edwintorok@gmail.com> Sat Sep 04 13:48:24 2010 +0300
committer Ian Romanick <ian.d.romanick@intel.com> Tue Sep 07 12:27:07 2010 -0700
tree a3ae5456ffd3a84758b9cd9d6805bde7d5648ad9
parent 3ea3f5e0a542cfd9f9a3433515fd27e0a5d1b1ac

glsl2: check for _NumLinkedShaders being 0

Otherwise spring 0.82+.4.0 crashes when starting a game
because prog->_LinkedShaders[0] is NULL.

This also fixes piglit test cases glsl-link-empty-prog-0[12].

src/glsl/linker.cpp

diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index e0823c3..02c7c29 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -1476,7 +1476,7 @@
 
    assign_uniform_locations(prog);
 
-   if (prog->_LinkedShaders[0]->Type == GL_VERTEX_SHADER) {
+   if (prog->_NumLinkedShaders && prog->_LinkedShaders[0]->Type == GL_VERTEX_SHADER) {
       /* FINISHME: The value of the max_attribute_index parameter is
        * FINISHME: implementation dependent based on the value of
        * FINISHME: GL_MAX_VERTEX_ATTRIBS.  GL_MAX_VERTEX_ATTRIBS must be