From cf144f4fe9e24dbfbe89c2067ddf909968fde588 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Mon, 12 Jun 2023 19:43:26 -0500
Subject: [PATCH] GUI: DirectX 11 render backend, part 2

---
 src/gui/gui.cpp               |  3 ++-
 src/gui/gui.h                 |  1 +
 src/gui/render/abstract.cpp   |  5 ++++-
 src/gui/render/renderDX11.cpp | 22 +++++++++++++++++++++-
 src/gui/render/renderDX11.h   |  7 +++++--
 5 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 732ce5514..6ea8a941a 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -3420,6 +3420,7 @@ bool FurnaceGUI::loop() {
               logV("portrait: %d (%dx%d)",portrait,scrW,scrH);
               logD("window resized to %dx%d",scrW,scrH);
               updateWindow=true;
+              rend->resized(ev);
               break;
             case SDL_WINDOWEVENT_MOVED:
               scrX=ev.window.data1;
@@ -5824,8 +5825,8 @@ bool FurnaceGUI::loop() {
         }
       }
     }
-    rend->present();
     drawTimeEnd=SDL_GetPerformanceCounter();
+    rend->present();
     if (settings.renderClearPos) {
       rend->clear(uiColors[GUI_COLOR_BACKGROUND]);
     }
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 19fdb2817..81266e432 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1248,6 +1248,7 @@ class FurnaceGUIRender {
     virtual bool destroyTexture(void* which);
     virtual void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
     virtual void setBlendMode(FurnaceGUIBlendMode mode);
+    virtual void resized(const SDL_Event& ev);
     virtual void clear(ImVec4 color);
     virtual bool newFrame();
     virtual void createFontsTexture();
diff --git a/src/gui/render/abstract.cpp b/src/gui/render/abstract.cpp
index 996cf4e86..a45c4ecd2 100644
--- a/src/gui/render/abstract.cpp
+++ b/src/gui/render/abstract.cpp
@@ -49,6 +49,9 @@ void FurnaceGUIRender::setTextureBlendMode(void* which, FurnaceGUIBlendMode mode
 void FurnaceGUIRender::setBlendMode(FurnaceGUIBlendMode mode) {
 }
 
+void FurnaceGUIRender::resized(const SDL_Event& ev) {
+}
+
 void FurnaceGUIRender::clear(ImVec4 color) {
 }
 
@@ -97,4 +100,4 @@ void FurnaceGUIRender::quitGUI() {
 }
 
 FurnaceGUIRender::~FurnaceGUIRender() {
-}
\ No newline at end of file
+}
diff --git a/src/gui/render/renderDX11.cpp b/src/gui/render/renderDX11.cpp
index dcfb09984..767878ce7 100644
--- a/src/gui/render/renderDX11.cpp
+++ b/src/gui/render/renderDX11.cpp
@@ -48,6 +48,15 @@ bool FurnaceGUIRenderDX11::createRenderTarget() {
     return false;
   }
 
+  DXGI_SWAP_CHAIN_DESC chainDesc;
+  memset(&chainDesc,0,sizeof(chainDesc));
+  if (swapchain->GetDesc(&chainDesc)!=S_OK) {
+    logW("createRenderTarget: could not get swapchain desc!");
+  } else {
+    outW=chainDesc.BufferDesc.Width;
+    outH=chainDesc.BufferDesc.Height;
+  }
+
   result=swapchain->GetBuffer(0,IID_PPV_ARGS(&screen));
   if (result!=S_OK) {
     logW("createRenderTarget: could not get buffer! %.8x",result);
@@ -103,6 +112,15 @@ void FurnaceGUIRenderDX11::setTextureBlendMode(void* which, FurnaceGUIBlendMode
 void FurnaceGUIRenderDX11::setBlendMode(FurnaceGUIBlendMode mode) {
 }
 
+void FurnaceGUIRenderDX11::resized(const SDL_Event& ev) {
+  destroyRenderTarget();
+  swapchain->ResizeBuffers(0,0,0,DXGI_FORMAT_UNKNOWN,0);
+
+  
+
+  createRenderTarget();
+}
+
 void FurnaceGUIRenderDX11::clear(ImVec4 color) {
   float floatColor[4]={
     color.x*color.w,
@@ -141,7 +159,9 @@ void FurnaceGUIRenderDX11::present() {
 }
 
 bool FurnaceGUIRenderDX11::getOutputSize(int& w, int& h) {
-  return false;
+  w=outW;
+  h=outH;
+  return true;
 }
 
 int FurnaceGUIRenderDX11::getWindowFlags() {
diff --git a/src/gui/render/renderDX11.h b/src/gui/render/renderDX11.h
index 9db29851e..1a3d7dca1 100644
--- a/src/gui/render/renderDX11.h
+++ b/src/gui/render/renderDX11.h
@@ -31,8 +31,8 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
   ID3D11DeviceContext* context;
   ID3D11RenderTargetView* renderTarget;
   IDXGISwapChain* swapchain;
+  int outW, outH;
   float quadVertex[4][3];
-  unsigned int quadBuf;
 
   bool destroyRenderTarget();
   bool createRenderTarget();
@@ -46,6 +46,7 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
     bool destroyTexture(void* which);
     void setTextureBlendMode(void* which, FurnaceGUIBlendMode mode);
     void setBlendMode(FurnaceGUIBlendMode mode);
+    void resized(const SDL_Event& ev);
     void clear(ImVec4 color);
     bool newFrame();
     void createFontsTexture();
@@ -64,7 +65,9 @@ class FurnaceGUIRenderDX11: public FurnaceGUIRender {
       device(NULL),
       context(NULL),
       renderTarget(NULL),
-      swapchain(NULL) {
+      swapchain(NULL),
+      outW(0),
+      outH(0) {
       memset(quadVertex,0,4*3*sizeof(float));
     }
 };