Backends: DX9: explicitely disable texture state stages after >= 1. (#4268)

imgui only uses texture stage state for stage 0
But any state set in stages >= 1 will affect rendering
Set stage 1 COLOROP to DISABLED, to deactivate stages >= 1

backends/imgui_impl_dx9.cpp

@@ -12,6 +12,7 @@
 
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
+//  2021-06-25: DirectX9: Explicitly disable texture state stages after >= 1.
 //  2021-05-19: DirectX9: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
 //  2021-04-23: DirectX9: Explicitly setting up more graphics states to increase compatibility with unusual non-default states.
 //  2021-03-18: DirectX9: Calling IDirect3DStateBlock9::Capture() after CreateStateBlock() as a workaround for state restoring issues (see #3857).
@@ -95,6 +96,8 @@ static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
     g_pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
+    g_pd3dDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE);
+    g_pd3dDevice->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_DISABLE);
     g_pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
     g_pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
 

docs/CHANGELOG.txt

@@ -55,6 +55,7 @@ Other Changes:
 - Backends: Win32: Rework to handle certains Windows 8.1/10 features without a manifest. (#4200, #4191)
   - ImGui_ImplWin32_GetDpiScaleForMonitor() will handle per-monitor DPI on Windows 10 without a manifest.
   - ImGui_ImplWin32_EnableDpiAwareness() will call SetProcessDpiAwareness() fallback on Windows 8.1 without a manifest.
+- Backends: DX9: Explicitly disable texture state stages after >= 1. (#4268) [@NZJenkins]
 - Backends: DX12: Fix texture casting crash on 32-bit systems (introduced on 2021/05/19 and v1.83) + added comments
   about building on 32-bit systems. (#4225) [@kingofthebongo2008]
 - Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)