Autoconfig extension with alternative name/vid/pid (#16990)

If there are several variants of a controller, but their button
layout is exactly the same, allow alternative identifiers, e.g.:
input_device_alt1
input_vendor_id_alt3
input_product_id_alt9

tasks/task_autodetect.c

@@ -112,51 +112,77 @@ static unsigned input_autoconfigure_get_config_file_affinity(
       autoconfig_handle_t *autoconfig_handle,
       config_file_t *config)
 {
-   int tmp_int         = 0;
-   uint16_t config_vid = 0;
-   uint16_t config_pid = 0;
-   bool pid_match      = false;
-   unsigned affinity   = 0;
-   struct config_entry_list
-      *entry           = NULL;
+   int i, tmp_int;
+   uint16_t config_vid;
+   uint16_t config_pid;
+   bool pid_match                  = false;
+   unsigned affinity;
+   unsigned max_affinity           = 0;
+   struct config_entry_list *entry = NULL;
+   char config_key[30];
+   char config_key_postfix[7];
 
-   /* Parse config file */
-   if (config_get_int(config, "input_vendor_id", &tmp_int))
-      config_vid = (uint16_t)tmp_int;
+   /* One main entry and up to 9 alternatives */
+   for (i=0 ; i < 10; i++)
+   {
+      config_vid = 0;
+      config_pid = 0;
+      tmp_int    = 0;
+      affinity   = 0;
 
-   if (config_get_int(config, "input_product_id", &tmp_int))
-      config_pid = (uint16_t)tmp_int;
+      if (i == 0)
+         config_key_postfix[0] = '\0';
+      else
+         snprintf(config_key_postfix, sizeof(config_key_postfix),
+                  "_alt%d",i);
+      
+      /* Parse config file */
+      snprintf(config_key, sizeof(config_key),
+                  "input_vendor_id%s",config_key_postfix);
+      if (config_get_int(config, config_key, &tmp_int))
+         config_vid = (uint16_t)tmp_int;
+
+      snprintf(config_key, sizeof(config_key),
+                  "input_product_id%s",config_key_postfix);
+      if (config_get_int(config, config_key, &tmp_int))
+         config_pid = (uint16_t)tmp_int;
 
    /* > Bliss-Box shenanigans... */
 #ifdef HAVE_BLISSBOX
-   if (autoconfig_handle->device_info.vid == BLISSBOX_VID)
-      config_pid = BLISSBOX_PID;
+      if (autoconfig_handle->device_info.vid == BLISSBOX_VID)
+         config_pid = BLISSBOX_PID;
 #endif
 
-   /* Check for matching VID+PID */
-   pid_match =    (autoconfig_handle->device_info.vid == config_vid)
-               && (autoconfig_handle->device_info.pid == config_pid)
-               && (autoconfig_handle->device_info.vid != 0)
-               && (autoconfig_handle->device_info.pid != 0);
+      /* Check for matching VID+PID */
+      pid_match =    (autoconfig_handle->device_info.vid == config_vid)
+                  && (autoconfig_handle->device_info.pid == config_pid)
+                  && (autoconfig_handle->device_info.vid != 0)
+                  && (autoconfig_handle->device_info.pid != 0);
 
-   /* > More Bliss-Box shenanigans... */
+      /* > More Bliss-Box shenanigans... */
 #ifdef HAVE_BLISSBOX
-   pid_match =     pid_match
-               && (autoconfig_handle->device_info.vid != BLISSBOX_VID)
-               && (autoconfig_handle->device_info.pid != BLISSBOX_PID);
+      pid_match =     pid_match
+                  && (autoconfig_handle->device_info.vid != BLISSBOX_VID)
+                  && (autoconfig_handle->device_info.pid != BLISSBOX_PID);
 #endif
 
-   if (pid_match)
-      affinity += 3;
+      if (pid_match)
+         affinity += 3;
 
-   /* Check for matching device name */
-   if (      (entry  = config_get_entry(config, "input_device"))
-         && !string_is_empty(entry->value)
-         &&  string_is_equal(entry->value,
-             autoconfig_handle->device_info.name))
-      affinity += 2;
+      /* Check for matching device name */
+      snprintf(config_key, sizeof(config_key),
+                  "input_device%s",config_key_postfix);
+      if (     (entry  = config_get_entry(config, config_key))
+            && !string_is_empty(entry->value)
+            &&  string_is_equal(entry->value,
+                autoconfig_handle->device_info.name))
+         affinity += 2;
 
-   return affinity;
+      if (max_affinity < affinity)
+         max_affinity = affinity;
+   }
+
+   return max_affinity;
 }
 
 /* 'Attaches' specified autoconfig file to autoconfig

tests-other/autoconf/TestpadD_alternative.cfg

@@ -0,0 +1,34 @@
+input_driver = "test"
+input_device = "Test joypad device D"
+input_vendor_id = 1
+input_product_id = 2
+input_device_alt1 = "Test joypad device E"
+input_device_alt8 = "Test joypad device F"
+input_vendor_id_alt8 = 21
+input_product_id_alt8 = 22
+input_device_display_name = "Test joypad device D/E/F"
+input_b_btn = "0"
+input_y_btn = "1"
+input_select_btn = "2"
+input_start_btn = "3"
+input_up_btn = "4"
+input_down_btn = "5"
+input_left_btn = "6"
+input_right_btn = "7"
+input_a_btn = "8"
+input_x_btn = "9"
+input_l_btn = "10"
+input_r_btn = "11"
+input_l2_btn = "12"
+input_r2_btn = "13"
+input_l3_btn = "14"
+input_r3_btn = "15"
+input_l_x_plus_axis = "+0"
+input_l_x_minus_axis = "-0"
+input_l_y_plus_axis = "+1"
+input_l_y_minus_axis = "-1"
+input_r_x_plus_axis = "+2"
+input_r_x_minus_axis = "-2"
+input_r_y_plus_axis = "+3"
+input_r_y_minus_axis = "-3"
+

tests-other/test_input_joypad_alternative_autoconfig.ratst

@@ -0,0 +1,18 @@
+[
+{
+  "action": 1,
+  "param_num": 0,
+  "param_str": "(0001:0002) Test joypad device D",
+  "frame": 0
+},
+{
+  "action": 1,
+  "param_num": 1,
+  "param_str": "(0003:0004) Test joypad device E"
+},
+{
+  "action": 1,
+  "param_num": 2,
+  "param_str": "(0015:0016) Test joypad device X"
+}
+]

tests-other/testinput_alternative_autoconfig.cfg

@@ -0,0 +1,19 @@
+# Test configuration file to be used with --appendconfig.
+# Sets up joypad driver, test input file for the joypad driver,
+# logging and autoconfig dir, and prevents saving.
+# Usage:
+#   retroarch --appendconfig tests-other/testinput_alternative_autoconfig.cfg\|tests-other/all_binds_empty.cfg
+
+# Test scenario:
+# - A device is connected with autoconfig profile
+# - A second device is connected which matches autoconfig profile alt1
+# - A third device is connected which matches autoconfig profile alt8 (only by vid/pid)
+# - VALIDATE: check that Player 1..3 have "Test joypad D/E/F" configured
+
+input_joypad_driver = "test"
+test_input_file_joypad = "tests-other/test_input_joypad_alternative_autoconfig.ratst"
+joypad_autoconfig_dir = "tests-other/autoconf"
+frontend_log_level = "0"
+libretro_log_level = "0"
+log_verbosity = "true"
+config_save_on_exit = "false"