From 7aa8e8e79c91ff9247f2181f62afefb1ab88d55c Mon Sep 17 00:00:00 2001
From: David Hackbarth <david@lyrebird-studio.com>
Date: Wed, 10 Sep 2025 16:08:11 +0200
Subject: [PATCH] add mesh creation (WIP)

---
 GDP/D3D9/D3D9.vcxproj         |  1 +
 GDP/D3D9/D3D9.vcxproj.filters |  3 +++
 GDP/D3D9/Mesh.cpp             | 16 ++++++++++++++++
 GDP/D3D9/Vertex.h             | 14 ++++++++++++++
 4 files changed, 34 insertions(+)
 create mode 100644 GDP/D3D9/Vertex.h

diff --git a/GDP/D3D9/D3D9.vcxproj b/GDP/D3D9/D3D9.vcxproj
index ba356b8..0bfee2a 100644
--- a/GDP/D3D9/D3D9.vcxproj
+++ b/GDP/D3D9/D3D9.vcxproj
@@ -194,6 +194,7 @@
     <ClInclude Include="Mesh.h" />
     <ClInclude Include="Time.h" />
     <ClInclude Include="Utilities.h" />
+    <ClInclude Include="Vertex.h" />
     <ClInclude Include="Window.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
diff --git a/GDP/D3D9/D3D9.vcxproj.filters b/GDP/D3D9/D3D9.vcxproj.filters
index 8b4a2f3..a081ecc 100644
--- a/GDP/D3D9/D3D9.vcxproj.filters
+++ b/GDP/D3D9/D3D9.vcxproj.filters
@@ -68,5 +68,8 @@
     <ClInclude Include="Window.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="Vertex.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/GDP/D3D9/Mesh.cpp b/GDP/D3D9/Mesh.cpp
index 443ec79..2c47363 100644
--- a/GDP/D3D9/Mesh.cpp
+++ b/GDP/D3D9/Mesh.cpp
@@ -1,5 +1,6 @@
 #include "Mesh.h"
 #include "Utilities.h"
+#include "Vertex.h"
 
 UINT Mesh::init(IDirect3DDevice9* pD3DDevice)
 {
@@ -30,6 +31,21 @@ void Mesh::deInit()
 
 UINT Mesh::createVertexBuffer(IDirect3DDevice9* pD3DDevice)
 {
+    // 1. define mesh structure
+    _vertexCount = 3;
+    _vertexStride = sizeof(Vertex);
+
+    // 2. create vertex buffer WITHOUT data
+    HRESULT hr = pD3DDevice->CreateVertexBuffer(
+        _vertexCount * _vertexStride, // vertex buffer byte length
+        D3DUSAGE_WRITEONLY, // vertex buffer access mode
+        FVF, // FVF - Flexible Vertex Format
+        D3DPOOL_MANAGED, // video memory management
+        &_pVertexBuffer,
+        nullptr // not used anymore
+    );
+
+    // 3. fill vertex buffer with data
     return 0;
 }
 
diff --git a/GDP/D3D9/Vertex.h b/GDP/D3D9/Vertex.h
new file mode 100644
index 0000000..2b87067
--- /dev/null
+++ b/GDP/D3D9/Vertex.h
@@ -0,0 +1,14 @@
+#pragma once
+#include <d3d9.h>
+
+#define FVF D3DFVF_XYZ
+
+struct Vertex
+{
+	FLOAT x;
+	FLOAT y;
+	FLOAT z;
+
+	Vertex() : x(0.0f), y(0.0f), z(0.0f) {}
+	Vertex(FLOAT _x, FLOAT _y, FLOAT _z) : x(_x), y(_y), z(_z) {}
+};
\ No newline at end of file