SDL_riscosASM.S
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;
; SDL - Simple DirectMedia Layer
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; Copyright (C) 1997-2009 Sam Lantinga
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;
; This library is free software; you can redistribute it and/or
; modify it under the terms of the GNU Library General Public
; License as published by the Free Software Foundation; either
; version 2 of the License, or (at your option) any later version.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; Library General Public License for more details.
;
; You should have received a copy of the GNU Library General Public
; License along with this library; if not, write to the Free
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;
; Sam Lantinga
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; slouken@libsdl.org
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;
; Assembler routines for RISC OS display
;
AREA |C$$CODE|
EXPORT |RISCOS_Put32|
; Display 32bpp to 32bpp, 1:1
;
; Code provided by Adrain Lees
;
; entry a1 -> destination
; a2 = dest width in pixels
; a3 = dest line length in bytes
; a4 = dest height in scanlines
; arg5 -> source
; arg6 = byte offset from end of source line to start of next
Arg5 * 10*4
Arg6 * Arg5+4
RISCOS_Put32 ROUT
STMFD sp!,{a2,v1-v6,sl,fp,lr}
LDR ip,[sp,#Arg5]
MOV lr,a1
B ucp64lp
00 ;tail strip of 1-15 pixels
LDR v1,[ip],#4
01 SUBS a2,a2,#1
STR v1,[lr],#4
LDRHI v1,[ip],#4
BHI %01
B %02
ucp64end ADDS a2,a2,#16
BNE %00
02 SUBS a4,a4,#1 ;height--
LDRHI v1,[sp,#Arg6]
LDRHI a2,[sp] ;reload width
BLS %03
;move to start of next scanline
ADD lr,a1,a3
ADD a1,a1,a3
ADD ip,ip,v1
ucp64lp SUBS a2,a2,#16
BLO ucp64end
PLD [ip,#64]
LDR v1,[ip],#4
LDR v2,[ip],#4
LDR v3,[ip],#4
LDR v4,[ip],#4
LDR v5,[ip],#4
LDR v6,[ip],#4
LDR sl,[ip],#4
LDR fp,[ip],#4
STR v1,[lr],#4
STR v2,[lr],#4
STR v3,[lr],#4
STR v4,[lr],#4
STR v5,[lr],#4
STR v6,[lr],#4
STR sl,[lr],#4
STR fp,[lr],#4
PLD [ip,#64]
LDR v1,[ip],#4
LDR v2,[ip],#4
LDR v3,[ip],#4
LDR v4,[ip],#4
LDR v5,[ip],#4
LDR v6,[ip],#4
LDR sl,[ip],#4
LDR fp,[ip],#4
STR v1,[lr],#4
STR v2,[lr],#4
STR v3,[lr],#4
STR v4,[lr],#4
STR v5,[lr],#4
STR v6,[lr],#4
STR sl,[lr],#4
STR fp,[lr],#4
B ucp64lp
03 LDMFD sp!,{a2,v1-v6,sl,fp,pc}