diff options
Diffstat (limited to 'src/post/goom/ppc_zoom_ultimate.s')
| -rw-r--r-- | src/post/goom/ppc_zoom_ultimate.s | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/post/goom/ppc_zoom_ultimate.s b/src/post/goom/ppc_zoom_ultimate.s new file mode 100644 index 000000000..171f9674a --- /dev/null +++ b/src/post/goom/ppc_zoom_ultimate.s @@ -0,0 +1,149 @@ +.data +.text +.section regular,__DATA +.globl _ppc_zoom ;// name of the function to call by C program + +; notes : +; this routine dynamically computes and applies a zoom filter +; do not use r0, r1, r2 and r13 +; registers are not saved so the call to this function must be the last thing done in the calling C function + +; parameters : +; r3 <=> unsigned int * frompixmap +; r4 <=> unsigned int * topixmap +; r5 <=> unsigned int sizeX (in pixels) +; r6 <=> unsigned int sizeY (in pixels) +; r7 <=> unsigned int * brutS +; r8 <=> unsigned int * brutD +; r9 <=> unsigned int buffratio + +; globals after init +; r3 <=> frompixmap - 1 byte needed for preincremental fetch (replaces r3) +; r4 <=> topixmap - 1 byte needed for preincremental fetch (replaces r4) +; r5 <=> ax = x max in 16th of pixels (replaces old r5) +; r6 <=> ay = y max in 16th of pixels (replaces old r6) +; r15 <=> row size in bytes +; r16 <=> 0xFF00FF (mask for parallel 32 bits pixs computing) +; r30 <=> brutS - 1 byte needed for preincremental fetch (replaces r7) +; r31 <=> brutD - 1 byte needed for preincremental fetch (replaces r8) + + + +_ppc_zoom: + +; init +li r16,0xFF +mullw r17,r5,r6 ; number of pixels to compute +subi r30,r8,4 +mulli r15,r5,4 +slwi r16,r16,16 +subi r5,r5,1 +subi r6,r6,1 +mtspr ctr,r17 ; number of pixels to compute +subi r31,r7,4 +subi r4,r4,4 +ori r16,r16,0xFF +mulli r5,r5,16 +mulli r6,r6,16 + + +boucle: + +; computes dynamically the position to fetch +lwzu r8,4(r30) ; px2 +lwzu r17,4(r31) ; px +lwzu r10,4(r30) ; py2 +lwzu r29,4(r31) ; py +sub r8,r8,r17 +sub r10,r10,r29 +mullw r8,r8,r9 +mullw r10,r10,r9 +srawi r8,r8,16 +srawi r10,r10,16 +add r17,r17,r8 +add r29,r29,r10 + + +; if px>ax or py>ay or px<0 or py <0 goto outofrange +cmpw cr1,r17,r5 +bgt- cr1,outofrange +cmpwi cr1,r17,0 +blt- cr1,outofrange +cmpw cr1,r29,r6 +bgt- cr1,outofrange +cmpwi cr1,r29,0 +blt- cr1,outofrange + + +; computes the attenuation coeffs +andi. r8,r17,0x0F ;coefh +andi. r10,r29,0x0F ;coefv +subfic r18,r8,15 ;diffcoefh +subfic r7,r10,15 ;diffcoefv +mullw r21,r18,r7 ; coeff +mullw r22,r8,r7 ; coeff << 8 +mullw r23,r18,r10 ; coeff << 16 +mullw r24,r8,r10 ; coeff << 24 + + +; calcul de l adresse du point d origine +srawi r17,r17,4 ; pertedec +srawi r29,r29,4 ; pertedec +srwi r7,r15,2 +mullw r29, r29,r7 +add r17,r17,r29 +slwi r17,r17,2 +add r17,r17,r3 + + +; computes final pixel color +lwz r25,0(r17) ; chargement de col1 ->r25 +and r8, r25,r16 +lwz r26,4(r17) ; chargement de col2 ->r26 +mullw r8, r8, r21 +andi. r18, r25,0xFF00 +add r17,r17,r15 +and r10, r26,r16 +mullw r18, r18, r21 +lwz r27,0(r17) ; chargement de col3 ->r27 +mullw r10, r10, r22 +andi. r29, r26, 0xFF00 +lwz r28,4(r17) ; chargement de col4 ->r28 +add r8, r8,r10 +mullw r29, r29, r22 +and r10, r27,r16 +add r18, r18, r29 +mullw r10, r10, r23 +andi. r29, r27, 0xFF00 +add r8, r8,r10 +mullw r29, r29, r23 +and r10, r28,r16 +add r18, r18, r29 +mullw r10, r10, r24 +andi. r29, r28, 0xFF00 +add r8, r8,r10 +mullw r29, r29, r24 + +srawi r7,r8,8 +add r18, r18, r29 +and r7, r7,r16 + +srawi r18, r18, 8 +andi. r18,r18,0xFF00 +or r7, r18, r7 + +b end ;goto end + + +; if out of range +outofrange: +li r7,0 + +end: +stwu r7, 4(r4) + + +bdnz+ boucle + + +blr |