vrend: use bits in caps set v2

We don't need the entire 32 bits to report the presence of TGSI
invariant support.

Suggested-by: Gert Wollny <gert.wollny@collabora.com>
Suggested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/virgl_hw.h

@@ -211,6 +211,10 @@ enum virgl_formats {
    VIRGL_FORMAT_MAX,
 };
 
+/* These are used by the capability_bits field in virgl_caps_v2. */
+#define VIRGL_CAP_NONE 0
+#define VIRGL_CAP_TGSI_INVARIANT       (1 << 0)
+
 struct virgl_caps_bool_set1 {
         unsigned indep_blend_enable:1;
         unsigned indep_blend_func:1;
@@ -298,8 +302,8 @@ struct virgl_caps_v2 {
         int32_t max_texture_gather_offset;
         uint32_t texture_buffer_offset_alignment;
         uint32_t uniform_buffer_offset_alignment;
-        uint32_t tgsi_invariant;
         uint32_t shader_buffer_offset_alignment;
+        uint32_t capability_bits;
 };
 
 union virgl_caps {

src/vrend_renderer.c

@@ -7081,7 +7081,7 @@ void vrend_renderer_fill_caps(uint32_t set, uint32_t version,
       glGetIntegerv(GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT, (GLint*)&caps->v2.shader_buffer_offset_alignment);
    }
 
-   caps->v2.tgsi_invariant = 1;
+   caps->v2.capability_bits |= VIRGL_CAP_TGSI_INVARIANT;
 }
 
 GLint64 vrend_renderer_get_timestamp(void)