expose ARB_texture_view support to guest

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/virgl_hw.h

@@ -214,6 +214,7 @@ enum virgl_formats {
 /* These are used by the capability_bits field in virgl_caps_v2. */
 #define VIRGL_CAP_NONE 0
 #define VIRGL_CAP_TGSI_INVARIANT       (1 << 0)
+#define VIRGL_CAP_TEXTURE_VIEW         (1 << 1)
 
 struct virgl_caps_bool_set1 {
         unsigned indep_blend_enable:1;

src/vrend_renderer.c

@@ -7541,6 +7541,9 @@ void vrend_renderer_fill_caps(uint32_t set, uint32_t version,
    }
 
    caps->v2.capability_bits |= VIRGL_CAP_TGSI_INVARIANT;
+
+   if (gl_ver >= 43 || epoxy_has_gl_extension("GL_ARB_texture_view"))
+      caps->v2.capability_bits |= VIRGL_CAP_TEXTURE_VIEW;
 }
 
 GLint64 vrend_renderer_get_timestamp(void)