mesa/st: emit string marker based on PIPE_CAP_STRING_MARKER

Fixes: 10ac88b72f ("mesa/st: drop emit string marker device table entry.")
Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18803>
(cherry picked from commit 37900ee2dd)

.pick_status.json

@@ -571,7 +571,7 @@
         "description": "mesa/st: emit string marker based on PIPE_CAP_STRING_MARKER",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "10ac88b72fac70eb3fa698179d48378600f59f74"
     },

src/mesa/main/debug_output.c

@@ -1089,7 +1089,7 @@ _mesa_DebugMessageInsert(GLenum source, GLenum type, GLuint id,
                  gl_enum_to_debug_severity(severity),
                  length, buf);
 
-   if (type == GL_DEBUG_TYPE_MARKER && ctx->pipe->emit_string_marker) {
+   if (type == GL_DEBUG_TYPE_MARKER && ctx->has_string_marker) {
       ctx->pipe->emit_string_marker(ctx->pipe, buf, length);
    }
 }

src/mesa/main/mtypes.h

@@ -3625,6 +3625,7 @@ struct gl_context
    struct st_config_options *st_opts;
    struct cso_context *cso_context;
    bool has_invalidate_buffer;
+   bool has_string_marker;
    /* On old libGL's for linux we need to invalidate the drawables
     * on glViewpport calls, this is set via a option.
     */

src/mesa/state_tracker/st_context.c

@@ -869,6 +869,9 @@ st_create_context(gl_api api, struct pipe_context *pipe,
    if (pipe->screen->get_param(pipe->screen, PIPE_CAP_INVALIDATE_BUFFER))
       ctx->has_invalidate_buffer = true;
 
+   if (pipe->screen->get_param(pipe->screen, PIPE_CAP_STRING_MARKER))
+      ctx->has_string_marker = true;
+
    st = st_create_context_priv(ctx, pipe, options);
    if (!st) {
       _mesa_free_context_data(ctx, true);