diff options
Diffstat (limited to 'engines/scumm/gfxARM.s')
| -rw-r--r-- | engines/scumm/gfxARM.s | 79 |
1 files changed, 34 insertions, 45 deletions
diff --git a/engines/scumm/gfxARM.s b/engines/scumm/gfxARM.s index 83aaa78927..f3a1f20303 100644 --- a/engines/scumm/gfxARM.s +++ b/engines/scumm/gfxARM.s @@ -24,7 +24,7 @@ .global asmDrawStripToScreen .global asmCopy8Col - + @ ARM implementation of asmDrawStripToScreen. @ @ C prototype would be: @@ -47,7 +47,7 @@ asmDrawStripToScreen: @ r2 = text @ r3 = src MOV r12,r13 - STMFD r13!,{r4-r7,r9-r11,R14} + STMFD r13!,{r4-r11,R14} LDMIA r12,{r4,r5,r6,r7} @ r4 = dst @ r5 = vsPitch @@ -69,57 +69,46 @@ asmDrawStripToScreen: MOV r10,#253 ORR r10,r10,r10,LSL #8 ORR r10,r10,r10,LSL #16 @ r10 = mask -yLoop: - MOV r14,r1 @ r14 = width + MOV r8,#0x7F + ORR r8, r8, r8, LSL #8 + ORR r8, r8, r8, LSL #16 @ r8 = 7f7f7f7f + STR r1,[r13,#-4]! @ Stack width + B xLoop + +notEntirelyTransparent: + AND r14,r9, r8 @ r14 = mask & 7f7f7f7f + ADD r14,r14,r8 @ r14 = (mask & 7f7f7f7f)+7f7f7f7f + ORR r14,r14,r9 @ r14 |= mask + BIC r14,r14,r8 @ r14 &= 80808080 + ADD r14,r8, r14,LSR #7 @ r14 = (rx>>7) + 7f7f7f7f + EOR r14,r14,r8 @ r14 ^= 7f7f7f7f + @ So bytes of r14 are 00 where source was matching value,FF otherwise + BIC r11,r11,r14 + AND r12,r12,r14 + ORR r12,r11,r12 + STR r12,[r4],#4 + SUBS r1,r1,#4 + BLE endXLoop xLoop: - LDR r12,[r2],#4 @ r12 = [text] - LDR r11,[r3],#4 @ r11 = [src] - CMP r12,r10 - BNE singleByteCompare - SUBS r14,r14,#4 + LDR r12,[r2],#4 @ r12 = temp = [text] + LDR r11,[r3],#4 @ r11 = [src] + @ Stall + EORS r9, r12,r10 @ r9 = mask = temp ^ TRANSPARENCY + BNE notEntirelyTransparent + SUBS r1, r1, #4 STR r11,[r4], #4 @ r4 = [dst] BGT xLoop - +endXLoop: 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 + LDRGT r1,[r13] @ r14 = width 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 + ADD r13,r13,#4 end: - LDMFD r13!,{r4-r7,r9-r11,PC} - + LDMFD r13!,{r4-r11,PC} + @ ARM implementation of asmCopy8Col @ @ C prototype would be: @@ -156,4 +145,4 @@ roll2: STR r14,[r0],r1 BNE yLoop2 - LDMFD r13!,{PC} + LDMFD r13!,{PC} |