From 93012b62f491c322891976ccf60c4a5500cc32b5 Mon Sep 17 00:00:00 2001
From: Misha <106913236+MishaProductions@users.noreply.github.com>
Date: Sat, 20 Jan 2024 16:12:35 -0500
Subject: [PATCH] Implement MxDisplaySurface::CreateCursorSurface (#471)

* Update mxdisplaysurface.cpp

* Fixes

* Update legovideomanager.cpp

* Match to 100%

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>
---
 .../lego/legoomni/include/legovideomanager.h  |  4 +-
 .../legoomni/src/video/legovideomanager.cpp   | 19 ++---
 LEGO1/omni/include/mxdisplaysurface.h         |  2 +-
 LEGO1/omni/src/video/mxdisplaysurface.cpp     | 74 ++++++++++++++++++-
 4 files changed, 85 insertions(+), 14 deletions(-)

diff --git a/LEGO1/lego/legoomni/include/legovideomanager.h b/LEGO1/lego/legoomni/include/legovideomanager.h
index a9532e87..67a7805c 100644
--- a/LEGO1/lego/legoomni/include/legovideomanager.h
+++ b/LEGO1/lego/legoomni/include/legovideomanager.h
@@ -72,8 +72,8 @@ private:
 	MxS32 m_cursorYCopy;                  // 0x508
 	MxS32 m_cursorX;                      // 0x50c
 	MxS32 m_cursorY;                      // 0x510
-	LPDIRECTDRAWSURFACE m_unk0x514;       // 0x514
-	RECT m_unk0x518;                      // 0x518
+	LPDIRECTDRAWSURFACE m_cursorSurface;  // 0x514
+	RECT m_cursorRect;                    // 0x518
 	undefined4 m_unk0x528;                // 0x528
 	MxBool m_drawFPS;                     // 0x52c
 	RECT m_fpsRect;                       // 0x530
diff --git a/LEGO1/lego/legoomni/src/video/legovideomanager.cpp b/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
index 2a5d1643..f31879b3 100644
--- a/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
+++ b/LEGO1/lego/legoomni/src/video/legovideomanager.cpp
@@ -30,7 +30,7 @@ LegoVideoManager::LegoVideoManager()
 	m_cursorX = m_cursorY;
 	m_cursorYCopy = m_cursorY;
 	m_cursorXCopy = m_cursorY;
-	m_unk0x514 = NULL;
+	m_cursorSurface = NULL;
 	m_fullScreenMovie = FALSE;
 	m_drawFPS = FALSE;
 	m_unk0x528 = 0;
@@ -309,18 +309,19 @@ inline void LegoVideoManager::DrawCursor()
 
 	LPDIRECTDRAWSURFACE ddSurface2 = m_displaySurface->GetDirectDrawSurface2();
 
-	if (!m_unk0x514) {
-		m_unk0x518.top = 0;
-		m_unk0x518.left = 0;
-		m_unk0x518.bottom = 16;
-		m_unk0x518.right = 16;
-		m_unk0x514 = MxDisplaySurface::FUN_100bc070();
+	if (!m_cursorSurface) {
+		m_cursorRect.top = 0;
+		m_cursorRect.left = 0;
+		m_cursorRect.bottom = 16;
+		m_cursorRect.right = 16;
+		m_cursorSurface = MxDisplaySurface::CreateCursorSurface();
 
-		if (!m_unk0x514)
+		if (!m_cursorSurface)
 			m_drawCursor = FALSE;
 	}
 
-	ddSurface2->BltFast(m_cursorXCopy, m_cursorYCopy, m_unk0x514, &m_unk0x518, DDBLTFAST_WAIT | DDBLTFAST_SRCCOLORKEY);
+	ddSurface2
+		->BltFast(m_cursorXCopy, m_cursorYCopy, m_cursorSurface, &m_cursorRect, DDBLTFAST_WAIT | DDBLTFAST_SRCCOLORKEY);
 }
 
 // STUB: LEGO1 0x1007bbc0
diff --git a/LEGO1/omni/include/mxdisplaysurface.h b/LEGO1/omni/include/mxdisplaysurface.h
index dde3d086..1d26264c 100644
--- a/LEGO1/omni/include/mxdisplaysurface.h
+++ b/LEGO1/omni/include/mxdisplaysurface.h
@@ -91,7 +91,7 @@ public:
 	); // vtable+0x44
 
 	void ClearScreen();
-	static LPDIRECTDRAWSURFACE FUN_100bc070();
+	static LPDIRECTDRAWSURFACE CreateCursorSurface();
 
 	inline LPDIRECTDRAWSURFACE GetDirectDrawSurface1() { return this->m_ddSurface1; }
 	inline LPDIRECTDRAWSURFACE GetDirectDrawSurface2() { return this->m_ddSurface2; }
diff --git a/LEGO1/omni/src/video/mxdisplaysurface.cpp b/LEGO1/omni/src/video/mxdisplaysurface.cpp
index fe67aebb..a9dc2608 100644
--- a/LEGO1/omni/src/video/mxdisplaysurface.cpp
+++ b/LEGO1/omni/src/video/mxdisplaysurface.cpp
@@ -679,9 +679,79 @@ done:
 	return surface;
 }
 
-// STUB: LEGO1 0x100bc070
-LPDIRECTDRAWSURFACE MxDisplaySurface::FUN_100bc070()
+// FUNCTION: LEGO1 0x100bc070
+LPDIRECTDRAWSURFACE MxDisplaySurface::CreateCursorSurface()
 {
+	LPDIRECTDRAWSURFACE newSurface = NULL;
+	IDirectDraw* draw = MVideoManager()->GetDirectDraw();
+	MVideoManager();
+
+	DDSURFACEDESC ddsd;
+	memset(&ddsd, 0, sizeof(ddsd));
+	ddsd.dwSize = sizeof(ddsd);
+
+	if (draw->GetDisplayMode(&ddsd) != S_OK) {
+		return NULL;
+	}
+
+	if (ddsd.ddpfPixelFormat.dwRGBBitCount != 16) {
+		return NULL;
+	}
+
+	ddsd.dwWidth = 16;
+	ddsd.dwHeight = 16;
+	ddsd.dwFlags = DDSD_PIXELFORMAT | DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS;
+	ddsd.ddsCaps.dwCaps = DDSCAPS_VIDEOMEMORY | DDSCAPS_OFFSCREENPLAIN;
+
+	if (draw->CreateSurface(&ddsd, &newSurface, NULL) != S_OK) {
+		ddsd.ddsCaps.dwCaps &= ~DDSCAPS_VIDEOMEMORY;
+		ddsd.ddsCaps.dwCaps |= DDSCAPS_SYSTEMMEMORY;
+
+		if (draw->CreateSurface(&ddsd, &newSurface, NULL) != S_OK)
+			goto done;
+	}
+
+	memset(&ddsd, 0, sizeof(ddsd));
+	ddsd.dwSize = sizeof(ddsd);
+
+	if (newSurface->Lock(NULL, &ddsd, DDLOCK_WAIT, NULL) != S_OK)
+		goto done;
+	else {
+		MxU16* surface = (MxU16*) ddsd.lpSurface;
+		MxLong pitch = ddsd.lPitch;
+
+		// draw a simple cursor to the surface
+		for (MxS32 x = 0; x < 16; x++) {
+			MxU16* surface2 = surface;
+			for (MxS32 y = 0; y < 16; y++) {
+				if ((y > 10 || x) && (x > 10 || y) && x + y != 10) {
+					if (x + y > 10)
+						*surface2 = 31775;
+					else
+						*surface2 = -1;
+				}
+				else {
+					*surface2 = 0;
+				}
+				surface2++;
+			}
+			surface = (MxU16*) ((MxU8*) surface + pitch);
+		}
+
+		newSurface->Unlock(ddsd.lpSurface);
+		DDCOLORKEY colorkey;
+		colorkey.dwColorSpaceHighValue = 31775;
+		colorkey.dwColorSpaceLowValue = 31775;
+		newSurface->SetColorKey(DDCKEY_SRCBLT, &colorkey);
+
+		return newSurface;
+	}
+
+done:
+	if (newSurface) {
+		newSurface->Release();
+	}
+
 	return NULL;
 }