Draft: CRT SwitchRes Linux EDID PoC

gfx/temp-hack/swedid-root

@@ -0,0 +1,53 @@
+#!/bin/bash
+
+# This script requires running as root. "sudo" is called from "gfx/video_crt_switch.c", thus requiring a sudoers rule to non-interactively grant root permissions when running "/usr/local/bin/swedid-root" (this script)
+# switchres binary must be in root's PATH
+
+# TODO: Get below values from RetroArch's video output settings instead of hardcoding.
+
+# Hardcode GPU number and Display name. Change these before running.
+_display="DP-1"
+_gpu="1"
+
+# Hardcode ini path or switchres monitor preset. Change this before running
+_sw_args="--ini /home/syboxez/.config/retroarch/config/switchres.ini"
+
+# Change $3 to $5 when no longer hardcoding Display or GPU
+if [ -z "$3" ]; then
+	echo "Usage: $0 [HRes] [VRes] [VFreq] [GPU Num] [Display]"
+	exit 1
+fi
+
+# Change $4 to $6 when no longer hardcoding
+if [ -n "$4" ]; then
+	echo "Too many arguments"
+	echo "Usage: $0 [HRes] [VRes] [VFreq] [GPU Num] [Display]"
+	exit 1
+fi
+
+# Backup EDID if backup doesn't exist
+# Currently hardcoding GPU number and display name. Change this before running!
+if [ ! -f /tmp/edid.bak ]; then
+	echo "Backing up EDID to /tmp/edid.bak"
+	dd if=/sys/class/drm/card"$_gpu"-"$_display"/edid of=/tmp/edid.bak bs=256
+else
+	echo "EDID already backed up to /tmp/edid.bak. Skipping backup."
+fi
+
+# TODO: Restore EDID after RA closes instead of attempting to use xrandr, which is what happens now.
+
+# Generate temperary working directory to generate EDID binary, then delete after applying
+_tmpdir=$(mktemp -d)
+if [ -z "$_tmpdir" ]; then
+        echo "_tmpdir doesn't exist"
+        exit 1
+fi
+cd "$_tmpdir"
+
+switchres $_sw_args --edid $1 $2 $3
+
+cat "$_tmpdir"/custom.bin > /sys/kernel/debug/dri/"$_gpu"/"$_display"/edid_override
+echo 1 > /sys/kernel/debug/dri/"$_gpu"/"$_display"/trigger_hotplug
+
+cd /tmp
+rm -rf "$_tmpdir"

gfx/video_crt_switch.c

@@ -293,6 +293,7 @@ static void switch_res_crt(
 {
    int w                   = native_width;
    int h                   = height;
+   char commandbuffer[256];
 
    /* Check if SR2 is loaded, if not, load it */
    if (crt_sr2_init(p_switch, monitor_index, crt_mode, super_width))
@@ -333,15 +334,11 @@ static void switch_res_crt(
       ret = sr_add_mode(w, h, rr, flags, &srm);
       if (!ret)
          RARCH_ERR("[CRT]: SR failed to add mode\n");
-      if (p_switch->kms_ctx)
-      {
-         get_modeline_for_kms(p_switch, &srm);
-         video_driver_set_video_mode(srm.width, srm.height, true);
-      }
-      else if (p_switch->khr_ctx)
-         RARCH_WARN("[CRT]: Vulkan -> Can't modeswitch for now\n");
-      else
-         ret = sr_set_mode(srm.id);
+
+      snprintf(commandbuffer, sizeof(commandbuffer), "/usr/bin/sudo /usr/local/bin/swedid-root %d %d %f", srm.width, srm.height, srm.vfreq);
+      printf("%s\n", commandbuffer);
+      ret = system(commandbuffer);
+
       if (!p_switch->kms_ctx && !ret)
          RARCH_ERR("[CRT]: SR failed to switch mode\n");
       p_switch->sr_core_hz = (float)srm.vfreq;