;

;    SDL - Simple DirectMedia Layer

;    Copyright (C) 1997-2004 Sam Lantinga

;

;    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

;    slouken@libsdl.org

;

; 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}