From 8ae06f6f4b01c27322d5810326cce28c22a62c89 Mon Sep 17 00:00:00 2001
From: Will Xyen <willxinc@users.noreply.github.com>
Date: Mon, 23 Dec 2019 18:04:03 -0500
Subject: [PATCH] d3d9exhook: Add option to specify the display adapter to open

---
 src/main/d3d9exhook/config-gfx.c | 31 +++++++++++++++++++++++++++++++
 src/main/d3d9exhook/config-gfx.h |  1 +
 src/main/d3d9exhook/d3d9ex.c     |  7 +++++++
 3 files changed, 39 insertions(+)

diff --git a/src/main/d3d9exhook/config-gfx.c b/src/main/d3d9exhook/config-gfx.c
index 54703a5..51ba8a0 100644
--- a/src/main/d3d9exhook/config-gfx.c
+++ b/src/main/d3d9exhook/config-gfx.c
@@ -1,3 +1,5 @@
+#include <d3d9.h>
+
 #include <string.h>
 
 #include "cconfig/cconfig-util.h"
@@ -11,12 +13,14 @@
 #define D3D9EXHOOK_CONFIG_GFX_WINDOW_WIDTH_KEY "gfx.window_width"
 #define D3D9EXHOOK_CONFIG_GFX_WINDOW_HEIGHT_KEY "gfx.window_height"
 #define D3D9EXHOOK_CONFIG_GFX_FORCED_RR_KEY "gfx.forced_refresh_rate"
+#define D3D9EXHOOK_CONFIG_GFX_DEVICE_ADAPTER_KEY "gfx.device_adapter"
 
 #define D3D9EXHOOK_CONFIG_GFX_DEFAULT_FRAMED_VALUE false
 #define D3D9EXHOOK_CONFIG_GFX_DEFAULT_WINDOWED_VALUE false
 #define D3D9EXHOOK_CONFIG_GFX_DEFAULT_WINDOW_WIDTH_VALUE -1
 #define D3D9EXHOOK_CONFIG_GFX_DEFAULT_WINDOW_HEIGHT_VALUE -1
 #define D3D9EXHOOK_CONFIG_GFX_DEFAULT_FORCED_RR_VALUE -1
+#define D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE D3DADAPTER_DEFAULT
 
 void d3d9exhook_config_gfx_init(struct cconfig *config)
 {
@@ -49,6 +53,12 @@ void d3d9exhook_config_gfx_init(struct cconfig *config)
         D3D9EXHOOK_CONFIG_GFX_FORCED_RR_KEY,
         D3D9EXHOOK_CONFIG_GFX_DEFAULT_FORCED_RR_VALUE,
         "Forced refresh rate, -1 to not force any (try 59 or 60 if monitor check fails to lock on high refresh rate monitors)");
+
+    cconfig_util_set_int(
+        config,
+        D3D9EXHOOK_CONFIG_GFX_DEVICE_ADAPTER_KEY,
+        D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE,
+        "D3D9ex device adapter (monitor), 0 (D3DADAPTER_DEFAULT) to use default, 1, 2 etc. to use specified adapter");
 }
 
 void d3d9exhook_config_gfx_get(
@@ -113,4 +123,25 @@ void d3d9exhook_config_gfx_get(
             D3D9EXHOOK_CONFIG_GFX_FORCED_RR_KEY,
             D3D9EXHOOK_CONFIG_GFX_DEFAULT_FORCED_RR_VALUE);
     }
+
+    if (!cconfig_util_get_int(
+            config,
+            D3D9EXHOOK_CONFIG_GFX_DEVICE_ADAPTER_KEY,
+            &config_gfx->device_adapter,
+            D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE)) {
+        log_warning(
+            "Invalid value for key '%s' specified, fallback "
+            "to default '%d'",
+            D3D9EXHOOK_CONFIG_GFX_DEVICE_ADAPTER_KEY,
+            D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE);
+    }
+
+    if (config_gfx->device_adapter < 0) {
+        log_warning(
+            "Invalid value for key '%s' specified, fallback "
+            "to default '%d'",
+            D3D9EXHOOK_CONFIG_GFX_DEVICE_ADAPTER_KEY,
+            D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE);
+        config_gfx->device_adapter = D3D9EXHOOK_CONFIG_GFX_DEFAULT_DEVICE_ADAPTER_VALUE;
+    }
 }
diff --git a/src/main/d3d9exhook/config-gfx.h b/src/main/d3d9exhook/config-gfx.h
index 0dc9afe..c223df4 100644
--- a/src/main/d3d9exhook/config-gfx.h
+++ b/src/main/d3d9exhook/config-gfx.h
@@ -15,6 +15,7 @@ struct d3d9exhook_config_gfx {
     int32_t window_width;
     int32_t window_height;
     int32_t forced_refresh_rate;
+    int32_t device_adapter;
 };
 
 /**
diff --git a/src/main/d3d9exhook/d3d9ex.c b/src/main/d3d9exhook/d3d9ex.c
index 877a1a5..8a14419 100644
--- a/src/main/d3d9exhook/d3d9ex.c
+++ b/src/main/d3d9exhook/d3d9ex.c
@@ -86,6 +86,7 @@ static int32_t d3d9ex_force_refresh_rate = -1;
 static int32_t d3d9ex_window_width = -1;
 static int32_t d3d9ex_window_height = -1;
 static bool d3d9ex_window_framed;
+static int32_t d3d9ex_device_adapter = D3DADAPTER_DEFAULT;
 
 /* ------------------------------------------------------------------------- */
 
@@ -208,6 +209,11 @@ static HRESULT STDCALL my_CreateDeviceEx(
         }
     }
 
+    if (d3d9ex_device_adapter != D3DADAPTER_DEFAULT) {
+        log_info("Forcing adapter %d -> %d", adapter, d3d9ex_device_adapter);
+        adapter = d3d9ex_device_adapter;
+    }
+
     hr = IDirect3D9Ex_CreateDeviceEx(
         real, adapter, type, hwnd, flags, pp, fdm, pdev);
 
@@ -269,6 +275,7 @@ void d3d9ex_configure(struct d3d9exhook_config_gfx* gfx_config)
     d3d9ex_window_height = gfx_config->window_height;
 
     d3d9ex_force_refresh_rate = gfx_config->forced_refresh_rate;
+    d3d9ex_device_adapter = gfx_config->device_adapter;
 }
 
 /* ------------------------------------------------------------------------- */