nvfx,nv50,nvc0: handle PIPE_CAP_GLSL_FEATURE_LEVEL

src/gallium/drivers/nv50/nv50_screen.c

@@ -110,6 +110,8 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_SM3:
       return 1;
+   case PIPE_CAP_GLSL_FEATURE_LEVEL:
+      return 120;
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return 8;
    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:

src/gallium/drivers/nvc0/nvc0_screen.c

@@ -97,6 +97,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
       return 1;
    case PIPE_CAP_SM3:
       return 1;
+   case PIPE_CAP_GLSL_FEATURE_LEVEL:
+      return 150;
    case PIPE_CAP_MAX_RENDER_TARGETS:
       return 8;
    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:

src/gallium/drivers/nvfx/nvfx_screen.c

@@ -34,6 +34,8 @@ nvfx_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_SM3:
 		/* TODO: >= nv4x support Shader Model 3.0 */
 		return 0;
+	case PIPE_CAP_GLSL_FEATURE_LEVEL:
+		return 120;
 	case PIPE_CAP_ANISOTROPIC_FILTER:
 		return 1;
 	case PIPE_CAP_POINT_SPRITE: