diff options
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/platform/ds/arm9/source/blitters_arm.s | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/backends/platform/ds/arm9/source/blitters_arm.s b/backends/platform/ds/arm9/source/blitters_arm.s index 5f7df298b4..48ec316675 100644 --- a/backends/platform/ds/arm9/source/blitters_arm.s +++ b/backends/platform/ds/arm9/source/blitters_arm.s @@ -20,149 +20,12 @@ @ @ @author Robin Watts (robin@wss.co.uk) - .global asmDrawStripToScreen - .global asmCopy8Col .global Rescale_320x256xPAL8_To_256x256x1555 .global Rescale_320x256x1555_To_256x256x1555 .section .itcm,"ax", %progbits .align 2 .code 32 - @ 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: |