From cf7d501bc457427387e4d3729a0c21ce93bcbf84 Mon Sep 17 00:00:00 2001
From: Quantum <quantum2048@gmail.com>
Date: Sun, 9 Jan 2022 22:23:59 -0500
Subject: [PATCH] [host] dxgi: allow copy backend selection

---
 .../platform/Windows/capture/DXGI/src/d3d11.c |  1 +
 .../platform/Windows/capture/DXGI/src/d3d12.c |  1 +
 host/platform/Windows/capture/DXGI/src/dxgi.c | 22 +++++++++++++++----
 .../Windows/capture/DXGI/src/dxgi_capture.h   |  1 +
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/host/platform/Windows/capture/DXGI/src/d3d11.c b/host/platform/Windows/capture/DXGI/src/d3d11.c
index eec0bf51..292d53b9 100644
--- a/host/platform/Windows/capture/DXGI/src/d3d11.c
+++ b/host/platform/Windows/capture/DXGI/src/d3d11.c
@@ -195,6 +195,7 @@ static void d3d11_preRelease(void)
 
 struct DXGICopyBackend copyBackendD3D11 = {
   .name         = "Direct3D 11",
+  .code         = "d3d11",
   .create       = d3d11_create,
   .free         = d3d11_free,
   .copyFrame    = d3d11_copyFrame,
diff --git a/host/platform/Windows/capture/DXGI/src/d3d12.c b/host/platform/Windows/capture/DXGI/src/d3d12.c
index cca2d90f..4968cda0 100644
--- a/host/platform/Windows/capture/DXGI/src/d3d12.c
+++ b/host/platform/Windows/capture/DXGI/src/d3d12.c
@@ -446,6 +446,7 @@ static void d3d12_preRelease(void)
 
 struct DXGICopyBackend copyBackendD3D12 = {
   .name         = "Direct3D 12",
+  .code         = "d3d12",
   .create       = d3d12_create,
   .free         = d3d12_free,
   .copyFrame    = d3d12_copyFrame,
diff --git a/host/platform/Windows/capture/DXGI/src/dxgi.c b/host/platform/Windows/capture/DXGI/src/dxgi.c
index 625a1220..340acee2 100644
--- a/host/platform/Windows/capture/DXGI/src/dxgi.c
+++ b/host/platform/Windows/capture/DXGI/src/dxgi.c
@@ -106,6 +106,13 @@ static void dxgi_initOptions(void)
       .type           = OPTION_TYPE_BOOL,
       .value.x_bool   = false
     },
+    {
+      .module         = "dxgi",
+      .name           = "copyBackend",
+      .description    = "The copy backend to use, i.e. d3d11 or d3d12",
+      .type           = OPTION_TYPE_STRING,
+      .value.x_string = "d3d11",
+    },
     {0}
   };
 
@@ -487,10 +494,17 @@ static bool dxgi_init(void)
       goto fail;
   }
 
+  const char * copyBackend = option_get_string("dxgi", "copyBackend");
   for (int i = 0; i < ARRAY_LENGTH(backends); ++i)
   {
-    if (backends[i]->create(this))
+    if (!strcasecmp(copyBackend, backends[i]->code))
     {
+      if (!backends[i]->create(this))
+      {
+        DEBUG_ERROR("Failed to initialize selected capture backend: %s", backends[i]->name);
+        goto fail;
+      }
+
       this->backend = backends[i];
       break;
     }
@@ -498,12 +512,12 @@ static bool dxgi_init(void)
 
   if (!this->backend)
   {
-    DEBUG_ERROR("Could not find a usable copy backend");
+    DEBUG_ERROR("Could not find copy backend: %s", copyBackend);
     goto fail;
   }
 
-  DEBUG_INFO("Copy backend     : %s", this->backend->name);
-  DEBUG_INFO("AcquireLock      : %s", this->useAcquireLock ? "enabled" : "disabled");
+  DEBUG_INFO("Copy backend      : %s", this->backend->name);
+  DEBUG_INFO("AcquireLock       : %s", this->useAcquireLock ? "enabled" : "disabled");
 
   for (int i = 0; i < this->maxTextures; ++i)
     this->texture[i].texDamageCount = -1;
diff --git a/host/platform/Windows/capture/DXGI/src/dxgi_capture.h b/host/platform/Windows/capture/DXGI/src/dxgi_capture.h
index 65e25456..72055acd 100644
--- a/host/platform/Windows/capture/DXGI/src/dxgi_capture.h
+++ b/host/platform/Windows/capture/DXGI/src/dxgi_capture.h
@@ -108,6 +108,7 @@ struct DXGIInterface
 struct DXGICopyBackend
 {
   const char * name;
+  const char * code;
   bool (*create)(struct DXGIInterface * intf);
   void (*free)(void);
   bool (*copyFrame)(Texture * tex, ID3D11Texture2D * src);