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path: root/mesalib/src/glsl/builtin_variables.cpp
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Diffstat (limited to 'mesalib/src/glsl/builtin_variables.cpp')
-rw-r--r--mesalib/src/glsl/builtin_variables.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/mesalib/src/glsl/builtin_variables.cpp b/mesalib/src/glsl/builtin_variables.cpp
index 9f9571619..34973023f 100644
--- a/mesalib/src/glsl/builtin_variables.cpp
+++ b/mesalib/src/glsl/builtin_variables.cpp
@@ -815,6 +815,8 @@ builtin_variable_generator::generate_vs_special_vars()
add_system_value(SYSTEM_VALUE_INSTANCE_ID, int_t, "gl_InstanceID");
if (state->AMD_vertex_shader_layer_enable)
add_output(VARYING_SLOT_LAYER, int_t, "gl_Layer");
+ if (state->AMD_vertex_shader_viewport_index_enable)
+ add_output(VARYING_SLOT_VIEWPORT, int_t, "gl_ViewportIndex");
if (compatibility) {
add_input(VERT_ATTRIB_POS, vec4_t, "gl_Vertex");
add_input(VERT_ATTRIB_NORMAL, vec3_t, "gl_Normal");