gallium/hud: dump hud_driver_query values to files

Dump values for every selected data source in GALLIUM_HUD.

Every data source has its own file and the filename is
equal to the data source identifier.

Set GALLIUM_HUD_DUMP_DIR to dump values to files in this directory.

No values are dumped if the environment variable is not set, the
directory doesn't exist or the user doesn't have write access.

Signed-off-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/hud/hud_context.c

@@ -33,6 +33,7 @@
  * Set GALLIUM_HUD=help for more info.
  */
 
+#include <inttypes.h>
 #include <signal.h>
 #include <stdio.h>
 
@@ -829,6 +830,9 @@ hud_graph_add_value(struct hud_graph *gr, uint64_t value)
    gr->current_value = value;
    value = value > gr->pane->ceiling ? gr->pane->ceiling : value;
 
+   if (gr->fd)
+      fprintf(gr->fd, "%" PRIu64 "\n", value);
+
    if (gr->index == gr->pane->max_num_vertices) {
       gr->vertices[0] = 0;
       gr->vertices[1] = gr->vertices[(gr->index-1)*2+1];
@@ -856,6 +860,8 @@ hud_graph_destroy(struct hud_graph *graph)
    FREE(graph->vertices);
    if (graph->free_query_data)
       graph->free_query_data(graph->query_data);
+   if (graph->fd)
+      fclose(graph->fd);
    FREE(graph);
 }
 

src/gallium/auxiliary/hud/hud_driver_query.c

@@ -351,6 +351,8 @@ hud_pipe_query_install(struct hud_batch_query_context **pbq,
 {
    struct hud_graph *gr;
    struct query_info *info;
+   const char *hud_dump_dir = getenv("GALLIUM_HUD_DUMP_DIR");
+   char *dump_file;
 
    gr = CALLOC_STRUCT(hud_graph);
    if (!gr)
@@ -378,6 +380,16 @@ hud_pipe_query_install(struct hud_batch_query_context **pbq,
       info->result_index = result_index;
    }
 
+   if (hud_dump_dir && access(hud_dump_dir, W_OK) == 0) {
+      dump_file = malloc(strlen(hud_dump_dir) + sizeof(gr->name));
+      if (dump_file) {
+         strcpy(dump_file, hud_dump_dir);
+         strcat(dump_file, gr->name);
+         gr->fd = fopen(dump_file, "w+");
+         free(dump_file);
+      }
+   }
+
    hud_pane_add_graph(pane, gr);
    pane->type = type; /* must be set before updating the max_value */
 

src/gallium/auxiliary/hud/hud_private.h

@@ -48,6 +48,7 @@ struct hud_graph {
    unsigned num_vertices;
    unsigned index; /* vertex index being updated */
    uint64_t current_value;
+   FILE *fd;
 };
 
 struct hud_pane {