From 8008a011097cc5bedb00bc7e83f482edbbda8714 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <anonymous.maarten@gmail.com>
Date: Fri, 20 Dec 2024 02:19:05 +0100
Subject: [PATCH] Implement MxDisplaySurface::FUN_100bc8b0

---
 .../legoomni/src/video/legovideomanager.cpp   |  8 +++--
 LEGO1/omni/include/mxdisplaysurface.h         |  2 +-
 LEGO1/omni/src/video/mxdisplaysurface.cpp     | 29 +++++++++++++++++--
 3 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/LEGO1/lego/legoomni/src/video/legovideomanager.cpp b/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
index e4c2a662..7805671a 100644
--- a/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
+++ b/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
@@ -417,7 +417,7 @@ void LegoVideoManager::DrawFPS()
 		SelectObject(dc, m_arialFont);
 		GetTextExtentPointA(dc, zeros, strlen(zeros), &m_fpsSize);
 		ReleaseDC(NULL, dc);
-		m_unk0x528 = m_displaySurface->FUN_100bc8b0();
+		m_unk0x528 = m_displaySurface->FUN_100bc8b0(m_fpsSize.cx, m_fpsSize.cy);
 		SetRect(&this->m_fpsRect, 0, 0, m_fpsSize.cx, m_fpsSize.cy);
 		if (m_unk0x528 == NULL) {
 			DeleteObject(m_arialFont);
@@ -428,7 +428,8 @@ void LegoVideoManager::DrawFPS()
 		color_key.dwColorSpaceHighValue = 0;
 		color_key.dwColorSpaceLowValue = 0;
 		m_unk0x528->SetColorKey(DDCKEY_SRCBLT, &color_key);
-		DDSURFACEDESC surfaceDesc = {0};
+		DDSURFACEDESC surfaceDesc;
+		memset(&surfaceDesc, 0, sizeof(surfaceDesc));
 		surfaceDesc.dwSize = sizeof(surfaceDesc);
 		if (m_unk0x528->Lock(NULL, &surfaceDesc, DDLOCK_WAIT, NULL) != DD_OK) {
 			m_unk0x528->Release();
@@ -457,7 +458,8 @@ void LegoVideoManager::DrawFPS()
 			char buffer[32];
 			int nb = sprintf(buffer, "%.02f", m_unk0x550 / (Timer()->GetTime() - m_unk0x54c) / 1000.f);
 			m_unk0x54c = Timer()->GetTime();
-			DDSURFACEDESC surfaceDesc = {0};
+			DDSURFACEDESC surfaceDesc;
+			memset(&surfaceDesc, 0, sizeof(surfaceDesc));
 			surfaceDesc.dwSize = sizeof(surfaceDesc);
 			if (m_unk0x528->Lock(NULL, &surfaceDesc, DDLOCK_WAIT, NULL) == DD_OK) {
 				DWORD i;
diff --git a/LEGO1/omni/include/mxdisplaysurface.h b/LEGO1/omni/include/mxdisplaysurface.h
index ba458d28..a3083f77 100644
--- a/LEGO1/omni/include/mxdisplaysurface.h
+++ b/LEGO1/omni/include/mxdisplaysurface.h
@@ -109,7 +109,7 @@ class MxDisplaySurface : public MxCore {
 		MxU8 p_bpp
 	);
 
-	IDirectDrawSurface* FUN_100bc8b0(void);
+	IDirectDrawSurface* FUN_100bc8b0(int width, int height);
 
 private:
 	MxU8 CountTotalBitsSetTo1(MxU32 p_param);
diff --git a/LEGO1/omni/src/video/mxdisplaysurface.cpp b/LEGO1/omni/src/video/mxdisplaysurface.cpp
index 4ff4f382..d3bf5677 100644
--- a/LEGO1/omni/src/video/mxdisplaysurface.cpp
+++ b/LEGO1/omni/src/video/mxdisplaysurface.cpp
@@ -1093,8 +1093,31 @@ MxBool MxDisplaySurface::VTable0x2c(
 	return 0;
 }
 
-// STUB: LEGO1 0x100bc8b0
-IDirectDrawSurface* MxDisplaySurface::FUN_100bc8b0(void)
+// FUNCTION: LEGO1 0x100bc8b0
+IDirectDrawSurface* MxDisplaySurface::FUN_100bc8b0(int width, int height)
 {
-	return NULL;
+	MxVideoManager *video_manager = MVideoManager();
+	IDirectDraw *ddraw = video_manager->GetDirectDraw();
+	MVideoManager();
+	DDSURFACEDESC surfaceDesc;
+	memset(&surfaceDesc, 0, sizeof(surfaceDesc));
+	surfaceDesc.dwSize = sizeof(surfaceDesc);
+	if (ddraw->GetDisplayMode(&surfaceDesc) != DD_OK) {
+		return NULL;
+	}
+	if (surfaceDesc.ddpfPixelFormat.dwRGBBitCount != 16) {
+		return NULL;
+	}
+	surfaceDesc.dwWidth = width;
+	surfaceDesc.dwHeight = height;
+	surfaceDesc.dwFlags = DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS;
+	surfaceDesc.ddsCaps.dwCaps = DDSCAPS_VIDEOMEMORY | DDSCAPS_OFFSCREENPLAIN;
+	IDirectDrawSurface *surface = NULL;
+	if (ddraw->CreateSurface(&surfaceDesc, &surface, NULL) != DD_OK) {
+		surfaceDesc.ddsCaps.dwCaps = (surfaceDesc.ddsCaps.dwCaps & ~DDSCAPS_VIDEOMEMORY) | DDSCAPS_SYSTEMMEMORY;
+		if (ddraw->CreateSurface(&surfaceDesc, &surface, NULL) != DD_OK) {
+			return NULL;
+		}
+	}
+	return surface;
 }