From 187395f382b19b9faa5af5d79212f6e107db8aaf Mon Sep 17 00:00:00 2001
From: stainless <>
Date: Tue, 9 Oct 2001 23:05:02 +0000
Subject: [PATCH] Added small screen to 512x384 video modes in the DOS port.

---
 zsnes/src/dos/dosintrf.asm  |  4 +-
 zsnes/src/dos/initvid.asm   |  1 +
 zsnes/src/video/copyvid.inc | 80 +++++++++++++++++++++++++++++++++++++
 3 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/zsnes/src/dos/dosintrf.asm b/zsnes/src/dos/dosintrf.asm
index 51517536..e94ccdb8 100644
--- a/zsnes/src/dos/dosintrf.asm
+++ b/zsnes/src/dos/dosintrf.asm
@@ -1014,7 +1014,7 @@ NEWSYM ClearScreen
 SECTION .data
 
 ; Total Number of Video Modes
-NEWSYM NumVideoModes, dd 15
+NEWSYM NumVideoModes, dd 17
 
 ; GUI Video Mode Names - Make sure that all names are of the same length
 ; and end with a NULL terminator
@@ -1048,7 +1048,7 @@ NEWSYM GUIEAVID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0     ; Eagle
 NEWSYM GUIIEVID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0     ; (Interp | Eagle)
 NEWSYM GUIFSVID, db 0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0     ; Full Screen
 NEWSYM GUIWSVID, db 0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0     ; (Full Scr. | Wide Scr.)
-NEWSYM GUISSVID, db 0,0,0,0,0,0,1,0,0,0,0,0,0,1,1,1,1,0     ; Small Screen
+NEWSYM GUISSVID, db 0,0,0,0,0,0,1,0,0,0,0,1,1,1,1,1,1,0     ; Small Screen
 NEWSYM GUITBVID, db 0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,0     ; Triple Buffering
 NEWSYM GUIHSVID, db 0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0     ; Half/Quarter Scanlines
 NEWSYM GUI2xVID, db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0     ; 2xSaI/Super Eagle Engines
diff --git a/zsnes/src/dos/initvid.asm b/zsnes/src/dos/initvid.asm
index d09a4452..11c13b06 100644
--- a/zsnes/src/dos/initvid.asm
+++ b/zsnes/src/dos/initvid.asm
@@ -363,6 +363,7 @@ NEWSYM dosinitvideo
 
 .initvesa2512x384x8
     mov byte[res640],2
+    mov byte[cbitmode],0
     mov word[vesa2_x],512
     mov word[vesa2_y],384
     mov byte[vesa2_bits],8
diff --git a/zsnes/src/video/copyvid.inc b/zsnes/src/video/copyvid.inc
index 94cbfacb..257e3a30 100644
--- a/zsnes/src/video/copyvid.inc
+++ b/zsnes/src/video/copyvid.inc
@@ -2257,6 +2257,8 @@ NEWSYM copyvesa2512x384x8b
     jne .startcopy
     ret
 .startcopy
+    cmp byte[smallscreenon],1
+    je near .smallscreen
     cmp byte[ForceNewGfxOff],0
     jne .nong16b
     cmp byte[newengen],0
@@ -2351,6 +2353,44 @@ NEWSYM copyvesa2512x384x8b
     jnz .b2
     jmp .returnloop
 
+.smallscreen
+    push es
+    mov ax,[vesa2selec]
+    mov es,ax
+    mov esi,[vidbuffer]
+    mov edi,[VidStartDraw]
+    add esi,16+256+32
+    add edi,72*512+128
+    cmp byte[resolutn],224
+    jne .ssres239
+    add edi,8*512
+.ssres239
+    xor eax,eax
+    mov dl,[resolutn]
+    dec dl
+    dec dl
+    cmp byte[MMXSupport],1
+    je .ssloopb
+.ssloopa
+    mov ecx,64
+    rep movsd
+    add esi,32
+    add edi,128*2
+    dec dl
+    jnz .ssloopa
+    jmp .done
+.ssloopb
+    mov ecx,16
+    MMXStuff
+    add esi,32
+    add edi,128*2
+    dec dl
+    jnz .ssloopb
+    emms
+.done
+    pop es
+    ret
+
 SECTION .bss
 .scratio resb 1
 .lastrep resb 1
@@ -5628,6 +5668,8 @@ NEWSYM copyvesa2512x384x16b
     jne .startcopy
     ret
 .startcopy
+    cmp byte[smallscreenon],1
+    je near .smallscreen
     push es
     mov byte[.lastrep],0
     mov ax,[vesa2selec]
@@ -5714,6 +5756,44 @@ NEWSYM copyvesa2512x384x16b
     jnz .b2
     jmp .returnloop
 
+.smallscreen
+    push es
+    mov ax,[vesa2selec]
+    mov es,ax
+    mov esi,[vidbuffer]
+    mov edi,[VidStartDraw]
+    add esi,16*2+256*2+32*2
+    add edi,72*512*2+128*2
+    cmp byte[resolutn],224
+    jne .ssres239
+    add edi,8*512*2
+.ssres239
+    xor eax,eax
+    mov dl,[resolutn]
+    dec dl
+    dec dl
+    cmp byte[MMXSupport],1
+    je .ssloopb
+.ssloopa
+    mov ecx,64*2
+    rep movsd
+    add esi,32*2
+    add edi,128*2*2
+    dec dl
+    jnz .ssloopa
+    jmp .done
+.ssloopb
+    mov ecx,16*2
+    MMXStuff
+    add esi,32*2
+    add edi,128*2*2
+    dec dl
+    jnz .ssloopb
+    emms
+.done
+    pop es
+    ret
+
 SECTION .bss
 .scratio resb 1
 .lastrep resb 1