# DirectX 9 Conversion Summary

## Conversion Status: Phase 1 Complete ✅

### Date: 2025-11-30
### Branch: dx9
### Commit: 97264e3

---

## What Was Done

### 1. Automated Conversions (✅ Complete)

#### Header Files
- **Changed**: `#include <d3d8.h>` → `#include <d3d9.h>`
- **Changed**: `#include <d3dx8.h>` → `#include <d3dx9.h>`
- **Files affected**: 64 header includes updated

#### Interface Types (1,002+ references)
- `LPDIRECT3D8` → `LPDIRECT3D9` (8 references)
- `LPDIRECT3DDEVICE8` → `LPDIRECT3DDEVICE9` (929 references)
- `IDirect3DTexture8` → `IDirect3DTexture9`
- `IDirect3DSurface8` → `IDirect3DSurface9`
- `IDirect3DVertexBuffer8` → `IDirect3DVertexBuffer9`
- `IDirect3DIndexBuffer8` → `IDirect3DIndexBuffer9`
- `IDirect3DCubeTexture8` → `IDirect3DCubeTexture9`
- `IDirect3DVolumeTexture8` → `IDirect3DVolumeTexture9`

#### Structures
- `D3DCAPS8` → `D3DCAPS9`
- `D3DADAPTER_IDENTIFIER8` → `D3DADAPTER_IDENTIFIER9`

#### API Functions
- `Direct3DCreate8()` → `Direct3DCreate9()`

#### Project Files
- **All .vcxproj files**: Library links updated
- **All .vcproj files**: Library links updated
- `d3d8.lib` → `d3d9.lib`
- `d3dx8.lib` → `d3dx9.lib`
- `d3dx8dt.lib` → `d3dx9d.lib`
- `dxerr8.lib` → `dxerr.lib`

### 2. Manual Fixes (✅ Complete)

#### d3dfont.h & d3dfont.cpp - Font System
**StateBlock API Changes**:
```cpp
// Before (DX8)
DWORD m_dwSavedStateBlock;
DWORD m_dwDrawTextStateBlock;

m_pd3dDevice->BeginStateBlock();
// ... set states ...
m_pd3dDevice->EndStateBlock(&m_dwSavedStateBlock);
m_pd3dDevice->CaptureStateBlock(m_dwSavedStateBlock);
m_pd3dDevice->ApplyStateBlock(m_dwSavedStateBlock);
m_pd3dDevice->DeleteStateBlock(m_dwSavedStateBlock);

// After (DX9)
IDirect3DStateBlock9* m_pSavedStateBlock;
IDirect3DStateBlock9* m_pDrawTextStateBlock;

m_pd3dDevice->BeginStateBlock();
// ... set states ...
m_pd3dDevice->EndStateBlock(&m_pSavedStateBlock);
m_pSavedStateBlock->Capture();
m_pSavedStateBlock->Apply();
m_pSavedStateBlock->Release();
```

**Render State Changes**:
- `D3DRS_EDGEANTIALIAS` → `D3DRS_ANTIALIASEDLINEENABLE`
- `D3DRS_VERTEXBLEND` value: `FALSE` → `D3DVBF_DISABLE`

**Sampler State Migration**:
```cpp
// Before (DX8)
SetTextureStageState(0, D3DTSS_MINFILTER, D3DTEXF_POINT);
SetTextureStageState(0, D3DTSS_MAGFILTER, D3DTEXF_POINT);
SetTextureStageState(0, D3DTSS_MIPFILTER, D3DTEXF_NONE);

// After (DX9)
SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_POINT);
SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_POINT);
SetSamplerState(0, D3DSAMP_MIPFILTER, D3DTEXF_NONE);
```

---

## Statistics

- **Total files modified**: 457 files
- **Insertions**: 1,608 lines
- **Deletions**: 1,260 lines
- **Net change**: +348 lines

### Affected Components
1. **Engine Core (Zalla3D Base Class)**: ✅
   - BaseGraphicsLayer.h/cpp
   - RenderDevice.h/cpp
   - EnumD3D.h/cpp
   - Texture.h/cpp
   - NTexture.h/cpp
   - d3dfont.h/cpp
   - VertexBuffer.h/cpp
   - RenderTargetTexture.h/cpp
   - etc.

2. **Engine Rendering (Zalla3D Scene Class)**: ✅
   - Z3DRenderable.h/cpp
   - Z3DTexture.h/cpp
   - Z3DGeneralChrModel.h/cpp
   - NMesh.h/cpp
   - OctreeScene.h/cpp
   - WaterW.h/cpp
   - etc.

3. **Effect System**: ✅
   - CGemRender.h/cpp
   - EffMeshloader.h/cpp
   - SMRHeader.h/cpp
   - etc.

4. **Client UI**: ✅
   - Sprite.h
   - RYLSpriteEX.h
   - GUITextEdit.h
   - GUITooltip.h
   - etc.

5. **Character Control**: ✅
   - CameraControl.h
   - CCameraScript.h
   - RYLObjectControl.h/cpp
   - etc.

---

## Known Issues & Warnings

### ⚠️ Requires DX9 Runtime
The converted code requires DirectX 9 runtime to be installed:
- **DLLs needed**: `d3d9.dll`, `d3dx9_43.dll` (or equivalent version)
- **Libraries needed**: `d3d9.lib`, `d3dx9.lib`

### ⚠️ Not Yet Tested
- **Compilation**: Not yet attempted
- **Runtime**: Not yet tested
- **Rendering correctness**: Not verified

### 🔍 Areas Needing Attention
1. **Shader Code**: Check vertex/pixel shader versions
2. **Texture Formats**: Some formats might behave differently
3. **Present Parameters**: Verify all D3DPRESENT_PARAMETERS fields
4. **Lock Flags**: `D3DLOCK_NOSYSLOCK` was removed in DX9
5. **Query System**: New query interfaces in DX9

---

## Next Steps

### Phase 2: Build & Fix Compilation Errors
1. ⏳ Set up DX9 SDK paths
2. ⏳ Attempt build
3. ⏳ Fix compilation errors
4. ⏳ Fix linker errors

### Phase 3: Runtime Testing
1. ⏳ Test device creation
2. ⏳ Test texture loading
3. ⏳ Test rendering pipeline
4. ⏳ Test UI rendering
5. ⏳ Test effects system
6. ⏳ Full game test

### Phase 4: Performance & Optimization
1. ⏳ Performance profiling
2. ⏳ Compare with DX8 baseline
3. ⏳ Optimize if needed
4. ⏳ Visual verification

### Phase 5: Documentation & Merge
1. ⏳ Update build documentation
2. ⏳ Update deployment guide
3. ⏳ Code review
4. ⏳ Merge to master

---

## Rollback Plan

If issues are encountered:
```bash
git checkout master  # Return to DX8 version
```

The original DX8 code is preserved in the `master` branch.

---

## Technical Notes

### DX8 vs DX9 Key Differences Applied

1. **StateBlock Management**:
   - DX8 used DWORD handles
   - DX9 uses COM interface pointers

2. **Sampler States**:
   - DX8: Part of texture stage states
   - DX9: Separate sampler states

3. **Render States**:
   - Some renamed or value changes
   - `D3DRS_EDGEANTIALIAS` → `D3DRS_ANTIALIASEDLINEENABLE`

4. **Shader Support**:
   - DX8: Up to VS 1.1, PS 1.4
   - DX9: Up to VS 3.0, PS 3.0 (depending on hardware)

### Files NOT Modified
- `/Client/Library/dxx8/*` - DX8 SDK samples preserved as reference
- Documentation files
- Resource files
- Build scripts

---

## Credits

**Conversion executed by**: Claude AI (Anthropic)
**Date**: November 30, 2025
**Method**: Automated sed scripts + manual StateBlock fixes
**Testing status**: Pending

---

## References

- [DirectX 9 SDK Documentation](https://docs.microsoft.com/en-us/windows/win32/direct3d9)
- [DX8 to DX9 Migration Guide](https://docs.microsoft.com/en-us/windows/win32/direct3d9/converting-to-directx-9)
- Migration Plan: `DX8_TO_DX9_MIGRATION_PLAN.md`