fix and test glIsProgram

2 files changed, 5 insertions, 5 deletions

diff --git a/src/library_gl.js b/src/library_gl.js
index 964f3f40..8f692dbf 100644
--- a/src/library_gl.js
+++ b/src/library_gl.js
@@ -908,11 +908,9 @@ var LibraryGL = {
   },
 
   glIsProgram: function(program) {
-    var fb = GL.programs[program];
-    if (typeof(fb) == 'undefined') {
-      return 0;
-    }
-    return Module.ctx.isProgram(fb);
+    var program = GL.programs[program];
+    if (!program) return 0;
+    return Module.ctx.isProgram(program);
   },
 
   glBindAttribLocation__sig: 'viii',
diff --git a/tests/gl_ps.c b/tests/gl_ps.c
index 81579c1d..a8a6807f 100644
--- a/tests/gl_ps.c
+++ b/tests/gl_ps.c
@@ -78,6 +78,8 @@ void shaders() {
   glLinkProgram(program);
   glGetProgramiv(program, GL_LINK_STATUS, &ok);
   assert(ok);
+  assert(glIsProgram(program));
+  assert(!glIsProgram(-1));
 
   glUseProgram(program);