From 1d43b112c95b86102a02675ba59765a09b24f588 Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Sun, 30 Sep 2018 01:02:48 +0200
Subject: [PATCH] switch to gdi on failure

---
 inc/main.h        |  2 +-
 inc/opengl.h      |  2 ++
 src/opengl.c      | 10 ++++++++++
 src/render.c      | 13 +------------
 src/render_d3d9.c | 20 ++++++++++++++++----
 src/render_soft.c |  6 ++++--
 6 files changed, 34 insertions(+), 19 deletions(-)

diff --git a/inc/main.h b/inc/main.h
index 89d1e09..0111d92 100644
--- a/inc/main.h
+++ b/inc/main.h
@@ -27,7 +27,7 @@
 #define WM_AUTORENDERER WM_USER+111
 #define WM_WINEFULLSCREEN WM_USER+112
 
-extern char OpenglVersion[];
+extern BOOL ShowDriverWarning;
 
 struct IDirectDrawImpl;
 struct IDirectDrawImplVtbl;
diff --git a/inc/opengl.h b/inc/opengl.h
index 2437ba5..32e3491 100644
--- a/inc/opengl.h
+++ b/inc/opengl.h
@@ -77,3 +77,5 @@ extern PFNGLTEXBUFFERPROC glTexBuffer;
 
 extern BOOL OpenGL_GotVersion2;
 extern BOOL OpenGL_GotVersion3;
+
+extern char OpenGL_Version[];
diff --git a/src/opengl.c b/src/opengl.c
index 6731c8f..3804ebf 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -71,6 +71,8 @@ PFNGLTEXBUFFERPROC glTexBuffer = NULL;
 BOOL OpenGL_GotVersion2;
 BOOL OpenGL_GotVersion3;
 
+char OpenGL_Version[128];
+
 void OpenGL_Init()
 {
     // Program
@@ -137,6 +139,14 @@ void OpenGL_Init()
     glTexBuffer = (PFNGLTEXBUFFERPROC)wglGetProcAddress("glTexBuffer");
 
     char *glversion = (char *)glGetString(GL_VERSION);
+    if (glversion)
+    {
+        strncpy(OpenGL_Version, glversion, sizeof(OpenGL_Version));
+        const char deli[2] = " ";
+        strtok(OpenGL_Version, deli);
+    }
+    else
+        OpenGL_Version[0] = '0';
 
     OpenGL_GotVersion2 = glGetUniformLocation && glActiveTexture && glUniform1i;
 
diff --git a/src/render.c b/src/render.c
index 28aec7a..73bc750 100644
--- a/src/render.c
+++ b/src/render.c
@@ -24,8 +24,6 @@
 
 #define TEXTURE_COUNT 4
 
-char OpenglVersion[128];
-
 static HGLRC OpenGLContext;
 static int MaxFPS;
 static BOOL VSyncEnabled;
@@ -92,6 +90,7 @@ DWORD WINAPI render_main(void)
 
     if (!UseOpenGL)
     {
+        ShowDriverWarning = TRUE;
         ddraw->renderer = render_soft_main;
         render_soft_main();
     }
@@ -104,16 +103,6 @@ static HGLRC CreateContext(HDC hdc)
     HGLRC context = wglCreateContext(hdc);
     BOOL madeCurrent = context && wglMakeCurrent(hdc, context);
 
-    char *glversion = (char *)glGetString(GL_VERSION);
-    if (glversion)
-    {
-        strncpy(OpenglVersion, glversion, sizeof(OpenglVersion));
-        const char deli[2] = " ";
-        strtok(OpenglVersion, deli);
-    }
-    else
-        OpenglVersion[0] = '0';
-
     if (!madeCurrent || (ddraw->autorenderer && glGetError() != GL_NO_ERROR))
     {
         if (madeCurrent)
diff --git a/src/render_d3d9.c b/src/render_d3d9.c
index 6196bda..858e534 100644
--- a/src/render_d3d9.c
+++ b/src/render_d3d9.c
@@ -33,6 +33,8 @@ IDirect3DTexture9 *PaletteTex;
 IDirect3DPixelShader9 *PixelShader;
 D3DPRESENT_PARAMETERS D3dpp;
 
+DWORD WINAPI render_soft_main(void);
+
 static void InitDirect3D(BOOL reset)
 {
     if (reset)
@@ -61,8 +63,8 @@ static void InitDirect3D(BOOL reset)
     float vpX = (float)ddraw->render.viewport.x;
     float vpY = (float)ddraw->render.viewport.y;
 
-    float vpW = (float)(ddraw->render.viewport.width + vpX);
-    float vpH = (float)(ddraw->render.viewport.height + vpY);
+    float vpW = (float)(ddraw->render.viewport.width + ddraw->render.viewport.x);
+    float vpH = (float)(ddraw->render.viewport.height + ddraw->render.viewport.y);
 
     typedef struct CUSTOMVERTEX { float x, y, z, rhw, u, v; } CUSTOMVERTEX;
     CUSTOMVERTEX vertices[] =
@@ -155,11 +157,12 @@ DWORD WINAPI render_d3d9_main(void)
                 &D3dpp,
                 &D3ddev);
 
-            InitDirect3D(FALSE);
+            if (D3ddev)
+                InitDirect3D(FALSE);
         }
     }
 
-    while (D3d && ddraw->render.run && WaitForSingleObject(ddraw->render.sem, INFINITE) != WAIT_FAILED)
+    while (D3ddev && ddraw->render.run && WaitForSingleObject(ddraw->render.sem, INFINITE) != WAIT_FAILED)
     {
 #if _DEBUG
         static DWORD tick_fps = 0;
@@ -281,5 +284,14 @@ DWORD WINAPI render_d3d9_main(void)
     if (hD3D9)
         FreeLibrary(hD3D9);
 
+    if (!D3ddev)
+    {
+        ShowDriverWarning = TRUE;
+        ddraw->renderer = render_soft_main;
+        render_soft_main();
+    }
+
+    D3ddev = NULL;
+
     return 0;
 }
diff --git a/src/render_soft.c b/src/render_soft.c
index c486c9c..98a275d 100644
--- a/src/render_soft.c
+++ b/src/render_soft.c
@@ -19,7 +19,9 @@
 
 #include "main.h"
 #include "surface.h"
+#include "opengl.h"
 
+BOOL ShowDriverWarning;
 
 static unsigned char getPixel(int x, int y)
 {
@@ -55,7 +57,7 @@ DWORD WINAPI render_soft_main(void)
 {
     DWORD warningEndTick = timeGetTime() + (15 * 1000);
     char warningText[512] = { 0 };
-    if (OpenglVersion[0])
+    if (ShowDriverWarning)
     {
         if (!ddraw->windowed)
             PostMessage(ddraw->hWnd, WM_AUTORENDERER, 0, 0);
@@ -63,7 +65,7 @@ DWORD WINAPI render_soft_main(void)
         _snprintf(
             warningText, sizeof(warningText), 
             "-WARNING- Using slow software rendering, please update your graphics card driver (%s)", 
-            strlen(OpenglVersion) > 10 ? "" : OpenglVersion);
+            strlen(OpenGL_Version) > 10 ? "" : OpenGL_Version);
     }
     else
         Sleep(500);