From 4fd52c1567b0b91ca164c27e6324f2405b39e874 Mon Sep 17 00:00:00 2001
From: David Hackbarth <david@lyrebird-studio.com>
Date: Wed, 3 Sep 2025 12:18:51 +0200
Subject: [PATCH] add direct3d device init (WIP)

---
 GDP/D3D9/Direct3D.cpp | 34 ++++++++++++++++++++++++++++++++++
 GDP/D3D9/Direct3D.h   |  3 ++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/GDP/D3D9/Direct3D.cpp b/GDP/D3D9/Direct3D.cpp
index fd7e02f..dfaec76 100644
--- a/GDP/D3D9/Direct3D.cpp
+++ b/GDP/D3D9/Direct3D.cpp
@@ -1,16 +1,49 @@
 #include "Direct3D.h"
+#include "Utilities.h"
 
 INT Direct3D::init(HWND hWnd, UINT width, UINT height, BOOL isFullscreen)
 {
 	// 1. create connection to Direct3D API
+	IDirect3D9* pD3D = Direct3DCreate9(D3D_SDK_VERSION);
+	if (pD3D == nullptr) return 200;
 
 	// 2. check compatibility
+	UINT adapter = D3DADAPTER_DEFAULT;
+	D3DDEVTYPE devType = D3DDEVTYPE_HAL;
+	D3DCAPS9 caps = {};
+	HRESULT hr = pD3D->GetDeviceCaps(adapter, devType, &caps);
+	CheckFailed(hr, 210);
+
+	DWORD vertexProcessing = D3DCREATE_SOFTWARE_VERTEXPROCESSING; // fallback software fixed function pipeline
+	if (caps.VertexProcessingCaps == D3DDEVCAPS_HWTRANSFORMANDLIGHT)
+	{
+		// hardware support for fixed function pipeline
+		vertexProcessing = D3DCREATE_HARDWARE_VERTEXPROCESSING;
+	}
 
 	// 3. define presentation parameters
+	D3DPRESENT_PARAMETERS d3dpp = {};
+	d3dpp.hDeviceWindow = hWnd; // target render window
+	d3dpp.Windowed = !isFullscreen; // window or fullscreen mode
+	d3dpp.BackBufferCount = 1; // at least 1
+	d3dpp.BackBufferWidth = width;
+	d3dpp.BackBufferHeight = height;
+	d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8;
+	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
 
 	// 4. create Direct3D device
+	hr = pD3D->CreateDevice(
+		adapter,
+		devType,
+		hWnd,
+		vertexProcessing, // optional parameters
+		&d3dpp,
+		&_pD3DDevice
+	);
+	CheckFailed(hr, 220);
 
 	// 5. tidy up
+	safeRelease(pD3D);
 
 	return 0;
 }
@@ -25,4 +58,5 @@ void Direct3D::endScene()
 
 void Direct3D::deInit()
 {
+	safeRelease(_pD3DDevice);
 }
diff --git a/GDP/D3D9/Direct3D.h b/GDP/D3D9/Direct3D.h
index f8c0a26..eee05a9 100644
--- a/GDP/D3D9/Direct3D.h
+++ b/GDP/D3D9/Direct3D.h
@@ -14,6 +14,7 @@ public:
 	IDirect3DDevice9* getDevice() const { return _pD3DDevice; }
 
 private:
-	IDirect3DDevice9* _pD3DDevice = nullptr; // our interface for api communication
+	// COM object - Component Object Model
+	IDirect3DDevice9* _pD3DDevice = nullptr; // our interface for graphic card communication
 };