add a cap for TGSI precise modifiers

This way, mesa can know that the TGSI-parser groks the _PRECISE
modifier, and it doesn't need to cull them any more.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/virgl_hw.h

@@ -221,6 +221,7 @@ enum virgl_formats {
 #define VIRGL_CAP_TEXTURE_VIEW         (1 << 1)
 #define VIRGL_CAP_SET_MIN_SAMPLES      (1 << 2)
 #define VIRGL_CAP_COPY_IMAGE           (1 << 3)
+#define VIRGL_CAP_TGSI_PRECISE         (1 << 4)
 
 struct virgl_caps_bool_set1 {
         unsigned indep_blend_enable:1;

src/vrend_renderer.c

@@ -7753,7 +7753,7 @@ void vrend_renderer_fill_caps(uint32_t set, uint32_t version,
 
    caps->v1.max_samples = vrend_renderer_query_multisample_caps(max, &caps->v2);
 
-   caps->v2.capability_bits |= VIRGL_CAP_TGSI_INVARIANT | VIRGL_CAP_SET_MIN_SAMPLES;
+   caps->v2.capability_bits |= VIRGL_CAP_TGSI_INVARIANT | VIRGL_CAP_SET_MIN_SAMPLES | VIRGL_CAP_TGSI_PRECISE;
 
    if (gl_ver >= 44)
       glGetIntegerv(GL_MAX_VERTEX_ATTRIB_STRIDE, (GLint*)&caps->v2.max_vertex_attrib_stride);