From 1eca0648f14047bde181f48ce928bef91c4f1c91 Mon Sep 17 00:00:00 2001
From: Tau <tau@nowhere>
Date: Thu, 8 Nov 2018 15:58:15 -0500
Subject: [PATCH] util/gfx.c: Add crude D3D9 window hook

---
 util/gfx.c       | 105 +++++++++++++++++++++++++++++++++++++++++++++++
 util/gfx.h       |   4 ++
 util/meson.build |   2 +
 3 files changed, 111 insertions(+)
 create mode 100644 util/gfx.c
 create mode 100644 util/gfx.h

diff --git a/util/gfx.c b/util/gfx.c
new file mode 100644
index 0000000..0cc557e
--- /dev/null
+++ b/util/gfx.c
@@ -0,0 +1,105 @@
+#include <windows.h>
+#include <d3d9.h>
+
+#include <stdlib.h>
+
+#include "hook/com-proxy.h"
+#include "hook/table.h"
+
+#include "util/dprintf.h"
+
+static HRESULT STDMETHODCALLTYPE my_CreateDevice(
+        IDirect3D9 *self,
+        UINT adapter,
+        D3DDEVTYPE type,
+        HWND hwnd,
+        DWORD flags,
+        D3DPRESENT_PARAMETERS *pp,
+        IDirect3DDevice9 **pdev);
+
+static IDirect3D9 * WINAPI my_Direct3DCreate9(UINT sdk_ver);
+
+static IDirect3D9 * (WINAPI *next_Direct3DCreate9)(UINT sdk_ver);
+
+static bool gfx_windowed;
+
+static const struct hook_symbol gfx_hooks[] = {
+    {
+        .name   = "Direct3DCreate9",
+        .patch  = my_Direct3DCreate9,
+        .link   = (void **) &next_Direct3DCreate9
+    },
+};
+
+void gfx_hook_init(void)
+{
+    hook_table_apply(NULL, "d3d9.dll", gfx_hooks, _countof(gfx_hooks));
+}
+
+void gfx_set_windowed(void)
+{
+    gfx_windowed = true;
+}
+
+static IDirect3D9 * WINAPI my_Direct3DCreate9(UINT sdk_ver)
+{
+    struct com_proxy *proxy;
+    IDirect3D9Vtbl *vtbl;
+    IDirect3D9 *api;
+    HRESULT hr;
+
+    dprintf("Direct3DCreate9 hook hit\n");
+
+    api = next_Direct3DCreate9(sdk_ver);
+
+    if (api == NULL) {
+        dprintf("next_Direct3DCreate9 returned NULL\n");
+
+        goto fail;
+    }
+
+    hr = com_proxy_wrap(&proxy, api, sizeof(*api->lpVtbl));
+
+    if (FAILED(hr)) {
+        dprintf("com_proxy_wrap returned %x\n", (int) hr);
+
+        goto fail;
+    }
+
+    vtbl = proxy->vptr;
+    vtbl->CreateDevice = my_CreateDevice;
+
+    return (IDirect3D9 *) proxy;
+
+fail:
+    if (api != NULL) {
+        IDirect3D9_Release(api);
+    }
+
+    return NULL;
+}
+
+static HRESULT STDMETHODCALLTYPE my_CreateDevice(
+        IDirect3D9 *self,
+        UINT adapter,
+        D3DDEVTYPE type,
+        HWND hwnd,
+        DWORD flags,
+        D3DPRESENT_PARAMETERS *pp,
+        IDirect3DDevice9 **pdev)
+{
+    struct com_proxy *proxy;
+    IDirect3D9 *real;
+
+    dprintf("IDirect3D9::CreateDevice hook hit\n");
+
+    proxy = com_proxy_downcast(self);
+    real = proxy->real;
+
+    if (gfx_windowed) {
+        pp->Windowed = TRUE;
+        pp->FullScreen_RefreshRateInHz = 0;
+    }
+
+    return IDirect3D9_CreateDevice(real, adapter, type, hwnd, flags, pp, pdev);
+}
diff --git a/util/gfx.h b/util/gfx.h
new file mode 100644
index 0000000..5c77059
--- /dev/null
+++ b/util/gfx.h
@@ -0,0 +1,4 @@
+#pragma once
+
+void gfx_hook_init(void);
+void gfx_set_windowed(void);
diff --git a/util/meson.build b/util/meson.build
index 7a8d6fa..1d69d09 100644
--- a/util/meson.build
+++ b/util/meson.build
@@ -15,6 +15,8 @@ util_lib = static_library(
         'dprintf.h',
         'dump.c',
         'dump.h',
+        'gfx.c',
+        'gfx.h',
         'setupapi.c',
         'setupapi.h',
     ],