From 32c983ad43bf850ec16d34f4974d45daa0b8db2b Mon Sep 17 00:00:00 2001
From: Aarron Lee <aarron-lee@users.noreply.github.com>
Date: Wed, 9 Oct 2024 23:19:15 -0400
Subject: [PATCH] script: GPD Win 4 display configuration

This introduces a display configuration for the GPD Win 4 handheld.

Most of this display configuration was derived from the edid as-is,
excluding the dynamic_refresh_rates.

All refresh rates were all manually tested with the Steam slider,
and the device functioned as expected through multiple games.

This was tested on two separate GPD Win 4 devices.

Tested on:

Model DMI
  - G1618-04
Distro
  - Bazzite 40
Kernels
  - 6.9.12-210.fsync.fc40.x86_64
  - 6.11.2-201.fsync.fc40.x86_64

All refresh rates were tested with the following games:

- Ghost of Tsushima
- Nier Automata
- Metaphor: ReFantazio (Demo)
- Boomerang Fu

These games were tested with 35hz, 40hz, 50hz,
and had no observed issues:

- Crosscode
- Cult of Lamb
- Dave the Diver
- MDA Rain Code Plus
- Shantae and the Seven Sirens
---
 .../00-gamescope/displays/gpd.win4.lcd.lua    | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 scripts/00-gamescope/displays/gpd.win4.lcd.lua

diff --git a/scripts/00-gamescope/displays/gpd.win4.lcd.lua b/scripts/00-gamescope/displays/gpd.win4.lcd.lua
new file mode 100644
index 0000000000..5f5eec898c
--- /dev/null
+++ b/scripts/00-gamescope/displays/gpd.win4.lcd.lua
@@ -0,0 +1,60 @@
+-- colorimetry from edid
+local gpd_win4_lcd_colorimetry = {
+    r = { x = 0.6250, y = 0.3398 },
+    g = { x = 0.2802, y = 0.5947 },
+    b = { x = 0.1552, y = 0.0703 },
+    w = { x = 0.2832, y = 0.2978 }
+}
+
+gamescope.config.known_displays.gpd_win4_lcd = {
+    pretty_name = "GPD Win 4",
+    dynamic_refresh_rates = {
+        31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+        41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
+        51, 52, 53, 54, 55, 56, 57, 58, 59, 60
+    },
+    hdr = {
+        supported = false,
+        force_enabled = false,
+        eotf = gamescope.eotf.gamma22,
+        max_content_light_level = 400,
+        max_frame_average_luminance = 400,
+        min_content_light_level = 0.5
+    },
+    colorimetry = gpd_win4_lcd_colorimetry,
+    dynamic_modegen = function(base_mode, refresh)
+        debug("Generating mode "..refresh.."Hz for GPD Win 4")
+        local mode = base_mode
+
+        gamescope.modegen.set_resolution(mode, 1920, 1080)
+
+        -- Horizontal timings: Hfront, Hsync, Hback
+        gamescope.modegen.set_h_timings(mode, 72, 8, 16)
+        -- Vertical timings: Vfront, Vsync, Vback
+        gamescope.modegen.set_v_timings(mode, 14, 3, 13)
+
+        mode.clock = gamescope.modegen.calc_max_clock(mode, refresh)
+        mode.vrefresh = gamescope.modegen.calc_vrefresh(mode)
+
+        return mode
+    end,
+    matches = function(display)
+        -- There are multiple revisions of the GPD Win 4
+        -- They all should have the same panel
+        -- lcd_types is just in case there are different panels
+        local lcd_types = {
+            { vendor = "GPD", model = "G1618-04" },
+        }
+
+        for index, value in ipairs(lcd_types) do
+            if value.vendor == display.vendor and value.model == display.model then
+                debug("[gpd_win4_lcd] Matched vendor: "..value.vendor.." model: "..value.model)
+                return 5000
+            end
+        end
+
+        return -1
+    end
+}
+debug("Registered GPD Win 4 as a known display")
+--debug(inspect(gamescope.config.known_displays.gpd_win4_lcd))