mesa: add support for AMD_vertex_shader_viewport_index

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Tested-by: Tobias Droste <tdroste@gmx.de>

src/mesa/main/extensions.c

@@ -323,6 +323,7 @@ static const struct extension extension_table[] = {
    { "GL_AMD_shader_stencil_export",               o(ARB_shader_stencil_export),               GL,             2009 },
    { "GL_AMD_shader_trinary_minmax",               o(dummy_true),                              GL,             2012 },
    { "GL_AMD_vertex_shader_layer",                 o(AMD_vertex_shader_layer),                 GLC,            2012 },
+   { "GL_AMD_vertex_shader_viewport_index",        o(AMD_vertex_shader_viewport_index),        GLC,            2012 },
    { "GL_APPLE_object_purgeable",                  o(APPLE_object_purgeable),                  GL,             2006 },
    { "GL_APPLE_packed_pixels",                     o(dummy_true),                              GLL,            2002 },
    { "GL_APPLE_texture_max_level",                 o(dummy_true),                                   ES1 | ES2, 2009 },

src/mesa/main/mtypes.h

@@ -3616,6 +3616,7 @@ struct gl_extensions
    GLboolean AMD_performance_monitor;
    GLboolean AMD_seamless_cubemap_per_texture;
    GLboolean AMD_vertex_shader_layer;
+   GLboolean AMD_vertex_shader_viewport_index;
    GLboolean APPLE_object_purgeable;
    GLboolean ATI_texture_compression_3dc;
    GLboolean ATI_texture_mirror_once;