From b1dd75ed87b0e57ecd1b9b9ed9107b80cced92dc Mon Sep 17 00:00:00 2001
From: dmaivel <dvmaivel@gmail.com>
Date: Sat, 8 Jun 2024 20:21:07 -0400
Subject: [PATCH] Fix Windows ICD, applications above `1.1` run now

* add windrv.h, WinDrvSetModuleAddress to get actual proc address

* added wglGetExtensionsStringARB, wglCreateContextAttribsARB

* added wglGetPixelFormatAttribivARB/fvARB, wglChoosePixelFormatARB
---
 inc/client/platform/windrv.h |  8 +++++
 src/client/platform/windrv.c | 63 ++++++++++++++++++++++++++++++++----
 src/client/winmain.c         |  6 ++--
 3 files changed, 69 insertions(+), 8 deletions(-)
 create mode 100644 inc/client/platform/windrv.h

diff --git a/inc/client/platform/windrv.h b/inc/client/platform/windrv.h
new file mode 100644
index 0000000..1783014
--- /dev/null
+++ b/inc/client/platform/windrv.h
@@ -0,0 +1,8 @@
+#ifdef _WIN32
+#ifndef _WINDRV_H_
+#define _WINDRV_H_
+
+void WinDrvSetModuleAddress(HMODULE module);
+
+#endif
+#endif
\ No newline at end of file
diff --git a/src/client/platform/windrv.c b/src/client/platform/windrv.c
index a90a643..c0a7c9c 100644
--- a/src/client/platform/windrv.c
+++ b/src/client/platform/windrv.c
@@ -3,6 +3,7 @@
 #include <windows.h>
 #include <client/glimpl.h>
 #include <client/platform/gldrv.h>
+#include <client/platform/windrv.h>
 
 #include <stdbool.h>
 
@@ -42,6 +43,57 @@ static struct pfd_depth_info pfd_depths[4] = {
     { 24, 8 }
 };
 
+static HMODULE g_hModule = 0;
+
+void WinDrvSetModuleAddress(HMODULE module)
+{
+    g_hModule = module;
+}
+
+static const char *wgl_extensions = "WGL_ARB_create_context WGL_ARB_create_context_profile WGL_ARB_extensions_string WGL_ARB_pixel_format";
+
+const char* wglGetExtensionsStringARB(HDC hdc)
+{
+    return wgl_extensions;
+}
+
+HGLRC wglCreateContextAttribsARB(HDC hDC, HGLRC hShareContext, const int *attribList)
+{
+    return (HGLRC)1;
+}
+
+BOOL wglGetPixelFormatAttribivARB(HDC hdc,
+                                  int iPixelFormat,
+                                  int iLayerPlane,
+                                  UINT nAttributes,
+                                  const int *piAttributes,
+                                  int *piValues)
+{
+    return TRUE;
+}
+
+BOOL wglGetPixelFormatAttribfvARB(HDC hdc,
+                                  int iPixelFormat,
+                                  int iLayerPlane,
+                                  UINT nAttributes,
+                                  const int *piAttributes,
+                                  FLOAT *pfValues)
+{
+    return TRUE;
+}
+
+BOOL wglChoosePixelFormatARB(HDC hdc,
+                             const int *piAttribIList,
+                             const FLOAT *pfAttribFList,
+                             UINT nMaxFormats,
+                             int *piFormats,
+                             UINT *nNumFormats)
+{
+    *piFormats = 1;
+    *nNumFormats = 1;
+    return TRUE;
+}
+
 static void pfdAdd(
     bool doublebuffer, bool gdi, unsigned int accum,
     int rbits, int gbits, int bbits, int abits,
@@ -168,13 +220,12 @@ BOOL APIENTRY DrvShareLists(DHGLRC dhglrc1, DHGLRC dhglrc2)
 PROC APIENTRY DrvGetProcAddress(LPCSTR lpszProc)
 {
     /*
-     * WGL Extensions
+     * WGL extensions, GL functions
+     * a table for WGL extensions makes sense, but we export every function so a table isn't needed
+     * commented out || (lpszProc[0] == 'w' && lpszProc[1] == 'g' && lpszProc[2] == 'l'), some apps dont like that part
      */
-    if (lpszProc[0] == 'w' && lpszProc[1] == 'g' && lpszProc[2] == 'l')
-        return NULL;
-
-    if (lpszProc[0] == 'g' && lpszProc[1] == 'l')
-        return GetProcAddress(GetModuleHandleW(NULL), lpszProc);
+    if ((lpszProc[0] == 'g' && lpszProc[1] == 'l'))
+        return GetProcAddress(g_hModule, lpszProc);
 
     return NULL;
 }
diff --git a/src/client/winmain.c b/src/client/winmain.c
index f2713d4..0240c83 100644
--- a/src/client/winmain.c
+++ b/src/client/winmain.c
@@ -1,7 +1,7 @@
 #ifdef _WIN32 /* globbed */
 
 #include <windows.h>
-#include <client/platform/wgl.h>
+#include <client/platform/windrv.h>
 #include <client/glimpl.h>
 
 VOID Main()
@@ -14,8 +14,10 @@ VOID Main()
 
 BOOL APIENTRY DllMain(HMODULE module, DWORD reason, LPVOID reserved) 
 {
-    if (reason == DLL_PROCESS_ATTACH)
+    if (reason == DLL_PROCESS_ATTACH) {
+        WinDrvSetModuleAddress(module);
         Main();
+    }
     if (reason == DLL_PROCESS_DETACH)
         glimpl_goodbye();