nvc0: expose GLSL version 420 on GK104

Other chipsets will be added later.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -120,6 +120,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
       return 128 * 1024 * 1024;
    case PIPE_CAP_GLSL_FEATURE_LEVEL:
+      if (class_3d == NVE4_3D_CLASS)
+         return 420;
       return 410;
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return 8;