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-rw-r--r--src/glsl/builtin_variables.cpp14
1 files changed, 13 insertions, 1 deletions
diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index ed6b922ca62..66b3abdd84c 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -870,13 +870,25 @@ generate_ARB_draw_instanced_variables(exec_list *instructions,
/* gl_InstanceIDARB is only available in the vertex shader.
*/
if (target == vertex_shader) {
- ir_variable *const inst =
+ ir_variable *inst =
add_variable(instructions, state->symbols,
"gl_InstanceIDARB", glsl_type::int_type,
ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
if (warn)
inst->warn_extension = "GL_ARB_draw_instanced";
+
+ /* Originally ARB_draw_instanced only specified that ARB decorated name.
+ * Since no vendor actually implemented that behavior and some apps use
+ * the undecorated name, the extension now specifies that both names are
+ * available.
+ */
+ inst = add_variable(instructions, state->symbols,
+ "gl_InstanceID", glsl_type::int_type,
+ ir_var_system_value, SYSTEM_VALUE_INSTANCE_ID);
+
+ if (warn)
+ inst->warn_extension = "GL_ARB_draw_instanced";
}
}