From ae05f178c237820ad183ef47a6c08e164988226f Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 10 Feb 2014 10:02:51 -0800
Subject: [PATCH] Recreate render target textures when the D3D device is being
 reset, and notify the application using the SDL_RENDER_TARGETS_RESET event
 when this happens.

---
 include/SDL_events.h                 |  3 +++
 src/render/direct3d/SDL_render_d3d.c | 38 ++++++++++++++++++++++------
 2 files changed, 33 insertions(+), 8 deletions(-)

diff --git a/include/SDL_events.h b/include/SDL_events.h
index 9be48c3a5..0b848b944 100644
--- a/include/SDL_events.h
+++ b/include/SDL_events.h
@@ -134,6 +134,9 @@ typedef enum
     /* Drag and drop events */
     SDL_DROPFILE        = 0x1000, /**< The system requests a file open */
 
+    /* Render events */
+    SDL_RENDER_TARGETS_RESET = 0x2000, /**< The render targets have been reset */
+
     /** Events ::SDL_USEREVENT through ::SDL_LASTEVENT are for your use,
      *  and should be allocated with SDL_RegisterEvents()
      */
diff --git a/src/render/direct3d/SDL_render_d3d.c b/src/render/direct3d/SDL_render_d3d.c
index 63dfff61c..cf8f3fe04 100644
--- a/src/render/direct3d/SDL_render_d3d.c
+++ b/src/render/direct3d/SDL_render_d3d.c
@@ -474,6 +474,7 @@ D3D_Reset(SDL_Renderer * renderer)
 {
     D3D_RenderData *data = (D3D_RenderData *) renderer->driverdata;
     HRESULT result;
+    SDL_Texture *texture;
 
     /* Release the default render target before reset */
     if (data->defaultRenderTarget) {
@@ -481,6 +482,13 @@ D3D_Reset(SDL_Renderer * renderer)
         data->defaultRenderTarget = NULL;
     }
 
+    /* Release application render targets */
+    for (texture = renderer->textures; texture; texture = texture->next) {
+        if (texture->access == SDL_TEXTUREACCESS_TARGET) {
+            D3D_DestroyTexture(renderer, texture);
+        }
+    }
+
     result = IDirect3DDevice9_Reset(data->device, &data->pparams);
     if (FAILED(result)) {
         if (result == D3DERR_DEVICELOST) {
@@ -491,9 +499,24 @@ D3D_Reset(SDL_Renderer * renderer)
         }
     }
 
+    /* Allocate application render targets */
+    for (texture = renderer->textures; texture; texture = texture->next) {
+        if (texture->access == SDL_TEXTUREACCESS_TARGET) {
+            D3D_CreateTexture(renderer, texture);
+        }
+    }
+
     IDirect3DDevice9_GetRenderTarget(data->device, 0, &data->defaultRenderTarget);
     D3D_InitRenderState(data);
     D3D_UpdateViewport(renderer);
+
+    /* Let the application know that render targets were reset */
+    {
+        SDL_Event event;
+        event.type = SDL_RENDER_TARGETS_RESET;
+        SDL_PushEvent(&event);
+    }
+
     return 0;
 }
 
@@ -570,7 +593,7 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
         return NULL;
     }
 
-    if( D3D_LoadDLL( &data->d3dDLL, &data->d3d ) ) {
+    if (D3D_LoadDLL(&data->d3dDLL, &data->d3d)) {
         for (d3dxVersion=50;d3dxVersion>0;d3dxVersion--) {
             LPTSTR dllName;
             SDL_snprintf(d3dxDLLFile, sizeof(d3dxDLLFile), "D3DX9_%02d.dll", d3dxVersion);
@@ -644,13 +667,12 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
     pparams.SwapEffect = D3DSWAPEFFECT_DISCARD;
 
     if (window_flags & SDL_WINDOW_FULLSCREEN) {
-        if ( ( window_flags & SDL_WINDOW_FULLSCREEN_DESKTOP ) == SDL_WINDOW_FULLSCREEN_DESKTOP )  {
+        if ((window_flags & SDL_WINDOW_FULLSCREEN_DESKTOP) == SDL_WINDOW_FULLSCREEN_DESKTOP)  {
             pparams.Windowed = TRUE;
             pparams.FullScreen_RefreshRateInHz = 0;
         } else {
-        pparams.Windowed = FALSE;
-        pparams.FullScreen_RefreshRateInHz =
-            fullscreen_mode.refresh_rate;
+            pparams.Windowed = FALSE;
+            pparams.FullScreen_RefreshRateInHz = fullscreen_mode.refresh_rate;
         }
     } else {
         pparams.Windowed = TRUE;
@@ -663,8 +685,8 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
     }
 
     /* Get the adapter for the display that the window is on */
-    displayIndex = SDL_GetWindowDisplayIndex( window );
-    data->adapter = SDL_Direct3D9GetAdapterIndex( displayIndex );
+    displayIndex = SDL_GetWindowDisplayIndex(window);
+    data->adapter = SDL_Direct3D9GetAdapterIndex(displayIndex);
 
     IDirect3D9_GetDeviceCaps(data->d3d, data->adapter, D3DDEVTYPE_HAL, &caps);
 
@@ -1912,7 +1934,7 @@ SDL_RenderGetD3D9Device(SDL_Renderer * renderer)
 
     device = data->device;
     if (device) {
-        IDirect3DDevice9_AddRef( device );
+        IDirect3DDevice9_AddRef(device);
     }
 #endif /* SDL_VIDEO_RENDER_D3D && !SDL_RENDER_DISABLED */