mesa: add KHR_no_error support for glGetUniformLocation()

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/mapi/glapi/gen/gl_API.xml

@@ -5427,7 +5427,7 @@
         <glx ignore="true"/>
     </function>
 
-    <function name="GetUniformLocation" es2="2.0">
+    <function name="GetUniformLocation" es2="2.0" no_error="true">
         <param name="program" type="GLuint"/>
         <param name="name" type="const GLchar *"/>
         <return type="GLint"/>

src/mesa/main/uniforms.c

@@ -1025,6 +1025,17 @@ _mesa_GetUniformLocation(GLuint programObj, const GLcharARB *name)
    return _mesa_program_resource_location(shProg, GL_UNIFORM, name);
 }
 
+GLint GLAPIENTRY
+_mesa_GetUniformLocation_no_error(GLuint programObj, const GLcharARB *name)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   struct gl_shader_program *shProg =
+      _mesa_lookup_shader_program(ctx, programObj);
+
+   return _mesa_program_resource_location(shProg, GL_UNIFORM, name);
+}
+
 GLuint GLAPIENTRY
 _mesa_GetUniformBlockIndex(GLuint program,
 			   const GLchar *uniformBlockName)

src/mesa/main/uniforms.h

@@ -224,6 +224,8 @@ void GLAPIENTRY
 _mesa_GetUniformdv(GLuint, GLint, GLdouble *);
 GLint GLAPIENTRY
 _mesa_GetUniformLocation(GLuint, const GLcharARB *);
+GLint GLAPIENTRY
+_mesa_GetUniformLocation_no_error(GLuint, const GLcharARB *);
 GLuint GLAPIENTRY
 _mesa_GetUniformBlockIndex(GLuint program,
 			   const GLchar *uniformBlockName);