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|
@ ScummVM Scumm Interpreter
@ Copyright (C) 2007 The ScummVM project
@
@ This program is free software@ you can redistribute it and/or
@ modify it under the terms of the GNU General Public License
@ as published by the Free Software Foundation@ either version 2
@ of the License, or (at your option) any later version.
@
@ This program 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 General Public License for more details.
@
@ You should have received a copy of the GNU General Public License
@ along with this program@ if not, write to the Free Software
@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
@
@ $URL: $
@ $Id: $
@
@ @author Robin Watts (robin@wss.co.uk)
.text
.global asmDrawStripToScreen
.global asmCopy8Col
.global Rescale_320x256xPAL8_To_256x256x1555
.global Rescale_320x256x1555_To_256x256x1555
@ ARM implementation of asmDrawStripToScreen.
@
@ C prototype would be:
@
@ extern "C" void asmDrawStripToScreen(int height,
@ int width,
@ byte const *text,
@ byte const *src,
@ byte *dst,
@ int vsPitch,
@ int vsScreenWidth,
@ int textSurfacePitch);
@
@ In addition, we assume that text, src and dst are all word (4 byte)
@ aligned. This is the same assumption that the old 'inline' version
@ made.
asmDrawStripToScreen:
@ r0 = height
@ r1 = width
@ r2 = text
@ r3 = src
MOV r12,r13
STMFD r13!,{r4-r7,r9-r11,R14}
LDMIA r12,{r4,r5,r6,r7}
@ r4 = dst
@ r5 = vsPitch
@ r6 = vmScreenWidth
@ r7 = textSurfacePitch
CMP r0,#0 @ If height<=0
MOVLE r0,#1 @ height=1
CMP r1,#4 @ If width<4
BLT end @ return
@ Width &= ~4 ? What's that about then? Width &= ~3 I could have
@ understood...
BIC r1,r1,#4
SUB r5,r5,r1 @ vsPitch -= width
SUB r6,r6,r1 @ vmScreenWidth -= width
SUB r7,r7,r1 @ textSurfacePitch -= width
MOV r10,#253
ORR r10,r10,r10,LSL #8
ORR r10,r10,r10,LSL #16 @ r10 = mask
yLoop:
MOV r14,r1 @ r14 = width
xLoop:
LDR r12,[r2],#4 @ r12 = [text]
LDR r11,[r3],#4 @ r11 = [src]
CMP r12,r10
BNE singleByteCompare
SUBS r14,r14,#4
STR r11,[r4], #4 @ r4 = [dst]
BGT xLoop
ADD r2,r2,r7 @ text += textSurfacePitch
ADD r3,r3,r5 @ src += vsPitch
ADD r4,r4,r6 @ dst += vmScreenWidth
SUBS r0,r0,#1
BGT yLoop
LDMFD r13!,{r4-r7,r9-r11,PC}
singleByteCompare:
MOV r9,r12,LSR #24 @ r9 = 1st byte of [text]
CMP r9,r10,LSR #24 @ if (r9 == mask)
MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src]
ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12
MOV r9,r12,LSR #24 @ r9 = 1st byte of [text]
CMP r9,r10,LSR #24 @ if (r9 == mask)
MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src]
ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12
MOV r9,r12,LSR #24 @ r9 = 1st byte of [text]
CMP r9,r10,LSR #24 @ if (r9 == mask)
MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src]
ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12
MOV r9,r12,LSR #24 @ r9 = 1st byte of [text]
CMP r9,r10,LSR #24 @ if (r9 == mask)
MOVEQ r9,r11,LSR #24 @ r9 = 1st byte of [src]
ORR r12,r9,r12,LSL #8 @ r12 = combine r9 and r12
STR r12,[r4],#4
SUBS r14,r14,#4
BGT xLoop
ADD r2,r2,r7 @ text += textSurfacePitch
ADD r3,r3,r5 @ src += vsPitch
ADD r4,r4,r6 @ dst += vmScreenWidth
SUBS r0,r0,#1
BGT yLoop
end:
LDMFD r13!,{r4-r7,r9-r11,PC}
@ ARM implementation of asmCopy8Col
@
@ C prototype would be:
@
@ extern "C" void asmCopy8Col(byte *dst,
@ int dstPitch,
@ const byte *src,
@ int height);
@
@ In addition, we assume that src and dst are both word (4 byte)
@ aligned. This is the same assumption that the old 'inline' version
@ made.
asmCopy8Col:
@ r0 = dst
@ r1 = dstPitch
@ r2 = src
@ r3 = height
STMFD r13!,{r14}
SUB r1,r1,#4
TST r3,#1
ADDNE r3,r3,#1
BNE roll2
yLoop2:
LDR r12,[r2],#4
LDR r14,[r2],r1
STR r12,[r0],#4
STR r14,[r0],r1
roll2:
LDR r12,[r2],#4
LDR r14,[r2],r1
SUBS r3,r3,#2
STR r12,[r0],#4
STR r14,[r0],r1
BNE yLoop2
LDMFD r13!,{PC}
@ ARM implementation of Rescale_320x256x1555_To_256x256x1555
@
@ C prototype would be:
@
@ extern "C" void Rescale_320x256x1555_To_256x256x1555(
@ u16 *dst,
@ const u16 *src,
@ int dstStride,
@ int srcStride);
Rescale_320x256x1555_To_256x256x1555:
@ r0 = dst
@ r1 = src
@ r2 = dstStride
@ r3 = srcStride
STMFD r13!,{r4-r5,r8-r11,r14}
SUB r2,r2,#64*5 @ srcStride -= line length
SUB r3,r3,#64*4 @ dstStride -= line length
MOV r8, #0x0000001F
ORR r8, r8,#0x00007C00
ORR r8, r8,#0x03E00000 @ r8 = mask
MOV r5, #200 @ r5 = y
yLoop3:
MOV r4, #64 @ r4 = x
xLoop3:
LDRH r9, [r0],#2 @ r9 = src0
LDRH r10,[r0],#2 @ r10= src1
LDRH r11,[r0],#2 @ r11= src2
LDRH r12,[r0],#2 @ r12= src3
LDRH r14,[r0],#2 @ r14= src4
ORR r9, r9, r9, LSL #16 @ r9 = src0 | src0
ORR r10,r10,r10,LSL #16 @ r10= src1 | src1
ORR r11,r11,r11,LSL #16 @ r11= src2 | src2
ORR r12,r12,r12,LSL #16 @ r12= src3 | src3
ORR r14,r14,r14,LSL #16 @ r13= src4 | src4
AND r9, r9, r8 @ r9 = 0 | G0 | 0 | B0 | 0 | R0
AND r10,r10,r8 @ r10= 0 | G1 | 0 | B1 | 0 | R1
AND r11,r11,r8 @ r11= 0 | G2 | 0 | B2 | 0 | R2
AND r12,r12,r8 @ r12= 0 | G3 | 0 | B3 | 0 | R3
AND r14,r14,r8 @ r14= 0 | G4 | 0 | B4 | 0 | R4
ADD r9, r9, r9, LSL #1 @ r9 = 3*src0
ADD r9, r9, r10 @ r9 = dst0<<2
ADD r10,r10,r11 @ r10= dst1
ADD r11,r11,r12 @ r11= dst2
ADD r12,r12,r14 @ r12= src3 + src4
ADD r12,r12,r14,LSL #1 @ r12= src3 + src4*3 = dst3<<2
AND r9, r8, r9, LSR #2 @ r9 = dst0 (split)
AND r10,r8, r10,LSR #1 @ r10= dst1 (split)
AND r11,r8, r11,LSR #1 @ r11= dst2 (split)
AND r12,r8, r12,LSR #2 @ r12= dst3 (split)
ORR r9, r9, r9, LSR #16 @ r9 = dst0
ORR r10,r10,r10,LSR #16 @ r10= dst1
ORR r11,r11,r11,LSR #16 @ r11= dst2
ORR r12,r12,r12,LSR #16 @ r12= dst3
ORR r9, r9, #0x8000
ORR r10,r10,#0x8000
ORR r11,r11,#0x8000
ORR r12,r12,#0x8000
STRH r9, [r1],#2
STRH r10,[r1],#2
STRH r11,[r1],#2
STRH r12,[r1],#2
SUBS r4,r4,#1
BGT xLoop3
ADD r0,r0,r2,LSL #1
ADD r1,r2,r3,LSL #1
SUBS r5,r5,#1
BGT yLoop3
LDMFD r13!,{r4-r5,r8-r11,PC}
@ ARM implementation of Rescale_320x256xPAL8_To_256x256x1555
@
@ C prototype would be:
@
@ extern "C" void Rescale_320x256xPAL8_To_256x256x1555(
@ u16 *dst,
@ const u8 *src,
@ int dstStride,
@ int srcStride,
@ const u16 *pal);
@
@ This is a slight reordering of the params from the existing C one.
@ Sorry, but it makes the code easier.
Rescale_320x256xPAL8_To_256x256x1555:
@ r0 = dst
@ r1 = src
@ r2 = dstStride
@ r3 = srcStride
STMFD r13!,{r4-r5,r8-r11,r14}
MOV r8, #0x0000001F
ORR r8, r8,#0x00007C00
ORR r8, r8,#0x03E00000 @ r8 = mask
LDR r9, [r13,#7*4] @ r9 = palette
SUB r13,r13,#256*4 @ r13 = 1K of space on the stack.
MOV r5, r13 @ r5 points to this space
MOV r14,#256
palLoop:
LDRH r10,[r9],#2 @ r10 = palette entry
SUBS r14,r14,#1
ORR r10,r10,r10,LSL #16
AND r10,r10,r8 @ r10 = separated palette entry
STR r10,[r5], #4
BGT palLoop
SUB r2,r2,#64*5 @ srcStride -= line length
SUB r3,r3,#64*4 @ dstStride -= line length
MOV r5,#200 @ r5 = y
yLoop4:
MOV r4,#64 @ r4 = x
xLoop4:
LDRB r9, [r0],#1 @ r9 = src0
LDRB r10,[r0],#1 @ r10= src1
LDRB r11,[r0],#1 @ r11= src2
LDRB r12,[r0],#1 @ r12= src3
LDRB r14,[r0],#1 @ r14= src4
LDR r9, [r13,r9, LSL #2] @ r9 = pal[src0]
LDR r10,[r13,r10,LSL #2] @ r10= pal[src1]
LDR r11,[r13,r11,LSL #2] @ r11= pal[src2]
LDR r12,[r13,r12,LSL #2] @ r12= pal[src3]
LDR r14,[r13,r14,LSL #2] @ r13= pal[src4]
ADD r9, r9, r9, LSL #1 @ r9 = 3*src0
ADD r9, r9, r10 @ r9 = dst0<<2
ADD r10,r10,r11 @ r10= dst1
ADD r11,r11,r12 @ r11= dst2
ADD r12,r12,r14 @ r12= src3 + src4
ADD r12,r12,r14,LSL #1 @ r12= src3 + src4*3 = dst3<<2
AND r9, r8, r9, LSR #2 @ r9 = dst0 (split)
AND r10,r8, r10,LSR #1 @ r10= dst1 (split)
AND r11,r8, r11,LSR #1 @ r11= dst2 (split)
AND r12,r8, r12,LSR #2 @ r12= dst3 (split)
ORR r9, r9, r9, LSR #16 @ r9 = dst0
ORR r10,r10,r10,LSR #16 @ r10= dst1
ORR r11,r11,r11,LSR #16 @ r11= dst2
ORR r12,r12,r12,LSR #16 @ r12= dst3
ORR r9, r9, #0x8000
ORR r10,r10,#0x8000
ORR r11,r11,#0x8000
ORR r12,r12,#0x8000
STRH r9, [r1],#2
STRH r10,[r1],#2
STRH r11,[r1],#2
STRH r12,[r1],#2
SUBS r4,r4,#1
BGT xLoop4
ADD r0,r0,r2
ADD r1,r2,r3,LSL #1
SUBS r5,r5,#1
BGT yLoop4
ADD r13,r13,#256*4
LDMFD r13!,{r4-r5,r8-r11,PC}
|
