From aae173486070968da8e29a3c8d29a83c3868f7ea Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sat, 17 Jun 2023 13:49:25 +0200
Subject: [PATCH 1/5] implement GetPrimaryBitDepth

---
 LEGO1/mxdirectdraw.cpp | 20 ++++++++++++++++++--
 LEGO1/mxdirectdraw.h   |  2 --
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/LEGO1/mxdirectdraw.cpp b/LEGO1/mxdirectdraw.cpp
index 2cd60b55..635c7bd8 100644
--- a/LEGO1/mxdirectdraw.cpp
+++ b/LEGO1/mxdirectdraw.cpp
@@ -2,6 +2,9 @@
 
 #include "mxdirectdraw.h"
 
+int g_paletteIndexed8 = 0;
+BOOL DAT_10100c70 = 0;
+
 HRESULT MxDirectDraw::SetEntries()
 {
   HRESULT ret;
@@ -49,11 +52,24 @@ void MxDirectDraw::FUN_1009e830(char *error_msg, HRESULT ret)
 
 int MxDirectDraw::GetPrimaryBitDepth()
 {
+  DWORD dwRGBBitCount;
   LPDIRECTDRAW pDDraw;
+  DDSURFACEDESC ddsd;
 
-  DirectDrawCreate(NULL, &pDDraw, NULL);
+  HRESULT result = DirectDrawCreate(NULL, &pDDraw, NULL);
+  dwRGBBitCount = 0;
+  if (!result)
+  {
+    memset(&ddsd, 0, sizeof(ddsd));
+    ddsd.dwSize = 108;
 
-  return 0;
+    pDDraw->GetDisplayMode(&ddsd);
+    dwRGBBitCount = ddsd.ddpfPixelFormat.dwRGBBitCount;
+    g_paletteIndexed8 = (ddsd.ddpfPixelFormat.dwFlags & DDPF_PALETTEINDEXED8) != 0;
+    pDDraw->Release();
+  }
+
+  return dwRGBBitCount;
 }
 
 int MxDirectDraw::Pause(int param_1)
diff --git a/LEGO1/mxdirectdraw.h b/LEGO1/mxdirectdraw.h
index 4f69de01..e2c70c95 100644
--- a/LEGO1/mxdirectdraw.h
+++ b/LEGO1/mxdirectdraw.h
@@ -32,6 +32,4 @@ class MxDirectDraw
 
 };
 
-BOOL DAT_10100c70 = 0;
-
 #endif // MXDIRECTDRAW_H

From 3a8cb2a50c6f48f17a7bc89314dd96b49dbf8f9f Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sat, 17 Jun 2023 13:57:53 +0200
Subject: [PATCH 2/5] use sizeof(ddsd) instead

---
 LEGO1/mxdirectdraw.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/LEGO1/mxdirectdraw.cpp b/LEGO1/mxdirectdraw.cpp
index 635c7bd8..b68968bc 100644
--- a/LEGO1/mxdirectdraw.cpp
+++ b/LEGO1/mxdirectdraw.cpp
@@ -61,7 +61,7 @@ int MxDirectDraw::GetPrimaryBitDepth()
   if (!result)
   {
     memset(&ddsd, 0, sizeof(ddsd));
-    ddsd.dwSize = 108;
+    ddsd.dwSize = sizeof(ddsd);
 
     pDDraw->GetDisplayMode(&ddsd);
     dwRGBBitCount = ddsd.ddpfPixelFormat.dwRGBBitCount;

From d9f10fe67b52bde8591e8b199dc45eb4804bb4af Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sat, 17 Jun 2023 15:03:59 +0200
Subject: [PATCH 3/5] name m_unk84c

---
 LEGO1/mxdirectdraw.cpp | 4 ++--
 LEGO1/mxdirectdraw.h   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/LEGO1/mxdirectdraw.cpp b/LEGO1/mxdirectdraw.cpp
index b68968bc..fbf2b4c3 100644
--- a/LEGO1/mxdirectdraw.cpp
+++ b/LEGO1/mxdirectdraw.cpp
@@ -85,7 +85,7 @@ int MxDirectDraw::Pause(int param_1)
       return 0;
     }
 
-    if (m_unk84c) {
+    if (m_fullScreen) {
       if (!FlipToGDISurface()) {
         return 0;
       }
@@ -112,7 +112,7 @@ HRESULT MxDirectDraw::FUN_1009e750()
 {
   HRESULT ret;
 
-  if (m_unk84c && m_unk848) {
+  if (m_fullScreen && m_unk848) {
     if (m_ddpal) {
       ret = m_ddpal->SetEntries(0, 0, 256, m_pal0);
       if (ret != DD_OK) {
diff --git a/LEGO1/mxdirectdraw.h b/LEGO1/mxdirectdraw.h
index e2c70c95..bf31d5ad 100644
--- a/LEGO1/mxdirectdraw.h
+++ b/LEGO1/mxdirectdraw.h
@@ -25,7 +25,7 @@ class MxDirectDraw
   PALETTEENTRY m_pal1[256]; // +0x42c
   HWND hWindow; // +0x83c
   long m_unk848;
-  long m_unk84c;
+  BOOL m_fullScreen;
   void (*m_unk85c)(char *, HRESULT, long); // error handler or logger?
   long m_unk864;
   long m_unk86c;

From ab0f319ef40f53a533774829f8d05f80c4ca9263 Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sat, 17 Jun 2023 15:15:04 +0200
Subject: [PATCH 4/5] use BOOL

---
 LEGO1/mxdirectdraw.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/LEGO1/mxdirectdraw.cpp b/LEGO1/mxdirectdraw.cpp
index fbf2b4c3..a2b22779 100644
--- a/LEGO1/mxdirectdraw.cpp
+++ b/LEGO1/mxdirectdraw.cpp
@@ -2,7 +2,7 @@
 
 #include "mxdirectdraw.h"
 
-int g_paletteIndexed8 = 0;
+BOOL g_paletteIndexed8 = 0;
 BOOL DAT_10100c70 = 0;
 
 HRESULT MxDirectDraw::SetEntries()

From 779be534641149de2731299accaed398b37530bd Mon Sep 17 00:00:00 2001
From: Christian Semmler <mail@csemmler.com>
Date: Sat, 17 Jun 2023 15:24:32 +0200
Subject: [PATCH 5/5] name m_unk848; it's also ddpfPixelFormat.dwFlags &
 DDPF_PALETTEINDEXED8

---
 LEGO1/mxdirectdraw.cpp | 4 ++--
 LEGO1/mxdirectdraw.h   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/LEGO1/mxdirectdraw.cpp b/LEGO1/mxdirectdraw.cpp
index a2b22779..2afabda9 100644
--- a/LEGO1/mxdirectdraw.cpp
+++ b/LEGO1/mxdirectdraw.cpp
@@ -9,7 +9,7 @@ HRESULT MxDirectDraw::SetEntries()
 {
   HRESULT ret;
 
-  if (m_unk848) {
+  if (m_paletteIndexed8) {
     if (m_ddpal) {
       ret = m_ddpal->SetEntries(0, 0, 256, m_pal1);
       if (ret != DD_OK) {
@@ -112,7 +112,7 @@ HRESULT MxDirectDraw::FUN_1009e750()
 {
   HRESULT ret;
 
-  if (m_fullScreen && m_unk848) {
+  if (m_fullScreen && m_paletteIndexed8) {
     if (m_ddpal) {
       ret = m_ddpal->SetEntries(0, 0, 256, m_pal0);
       if (ret != DD_OK) {
diff --git a/LEGO1/mxdirectdraw.h b/LEGO1/mxdirectdraw.h
index bf31d5ad..b372cc83 100644
--- a/LEGO1/mxdirectdraw.h
+++ b/LEGO1/mxdirectdraw.h
@@ -24,7 +24,7 @@ class MxDirectDraw
   PALETTEENTRY m_pal0[256]; // +0x2c
   PALETTEENTRY m_pal1[256]; // +0x42c
   HWND hWindow; // +0x83c
-  long m_unk848;
+  BOOL m_paletteIndexed8;
   BOOL m_fullScreen;
   void (*m_unk85c)(char *, HRESULT, long); // error handler or logger?
   long m_unk864;