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/*
* Written by José Fonseca <j_r_fonseca@yahoo.co.uk>
*/
#include "matypes.h"
/* integer multiplication - alpha plus one
*
* makes the following approximation to the division (Sree)
*
* rgb*a/255 ~= (rgb*(a+1)) >> 256
*
* which is the fastest method that satisfies the following OpenGL criteria
*
* 0*0 = 0 and 255*255 = 255
*
* note that MX1 is a register with 0xffffffffffffffff constant which can be easily obtained making
*
* PCMPEQW ( MX1, MX1 )
*/
#define GMB_MULT_AP1( MP1, MA1, MP2, MA2, MX1 ) \
PSUBW ( MX1, MA1 ) /* a1 + 1 | a1 + 1 | a1 + 1 | a1 + 1 */ ;\
TWO(PSUBW ( MX1, MA2 )) /* a2 + 1 | a2 + 1 | a2 + 1 | a2 + 1 */ ;\
;\
PMULLW ( MP1, MA1 ) /* t1 = p1*a1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = p2*a2 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* t1 >> 8 ~= t1/255 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* t2 >> 8 ~= t2/255 */
/* integer multiplication - geometric series
*
* takes the geometric series approximation to the division
*
* t/255 = (t >> 8) + (t >> 16) + (t >> 24) ..
*
* in this case just the first two terms to fit in 16bit arithmetic
*
* t/255 ~= (t + (t >> 8)) >> 8
*
* note that just by itself it doesn't satisfies the OpenGL criteria, as 255*255 = 254,
* so the special case a = 255 must be accounted or roundoff must be used
*/
#define GMB_MULT_GS( MP1, MA1, MP2, MA2 ) \
PMULLW ( MP1, MA1 ) /* t1 = p1*a1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = p2*a2 */ ;\
;\
MOVQ ( MA1, MP1 ) ;\
TWO(MOVQ ( MA2, MP2 )) ;\
;\
PSRLW ( CONST(8), MP1 ) /* t1 >> 8 */ ;\
TWO(PSRLW ( CONST(8), MP2 )) /* t2 >> 8 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) ~= (t2/255) << 8 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* sa1 | sb1 | sg1 | sr1 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* sa2 | sb2 | sg2 | sr2 */
/* integer multiplication - geometric series plus rounding
*
* when using a geometric series division instead of truncating the result
* use roundoff in the approximation (Jim Blinn)
*
* t = rgb*a + 0x80
*
* achieving the exact results
*
* note that M80 is register with the 0x0080008000800080 constant
*/
#define GMB_MULT_GSR( MP1, MA1, MP2, MA2, M80 ) \
PMULLW ( MP1, MA1 ) /* t1 = p1*a1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = p2*a2 */ ;\
;\
PADDW ( M80, MA1 ) /* t1 += 0x80 */ ;\
TWO(PADDW ( M80, MA2 )) /* t2 += 0x80 */ ;\
;\
MOVQ ( MA1, MP1 ) ;\
TWO(MOVQ ( MA2, MP2 )) ;\
;\
PSRLW ( CONST(8), MP1 ) /* t1 >> 8 */ ;\
TWO(PSRLW ( CONST(8), MP2 )) /* t2 >> 8 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) ~= (t2/255) << 8 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* sa1 | sb1 | sg1 | sr1 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* sa2 | sb2 | sg2 | sr2 */
/* linear interpolation - geometric series
*/
#define GMB_LERP_GS( MP1, MQ1, MA1, MP2, MQ2, MA2) \
PSUBW ( MQ1, MP1 ) /* pa1 - qa1 | pb1 - qb1 | pg1 - qg1 | pr1 - qr1 */ ;\
TWO(PSUBW ( MQ2, MP2 )) /* pa2 - qa2 | pb2 - qb2 | pg2 - qg2 | pr2 - qr2 */ ;\
;\
PSLLW ( CONST(8), MQ1 ) /* q1 << 8 */ ;\
TWO(PSLLW ( CONST(8), MQ2 )) /* q2 << 8 */ ;\
;\
PMULLW ( MP1, MA1 ) /* t1 = (q1 - p1)*pa1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = (q2 - p2)*pa2 */ ;\
;\
MOVQ ( MA1, MP1 ) ;\
TWO(MOVQ ( MA2, MP2 )) ;\
;\
PSRLW ( CONST(8), MP1 ) /* t1 >> 8 */ ;\
TWO(PSRLW ( CONST(8), MP2 )) /* t2 >> 8 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) ~= (t2/255) << 8 */ ;\
;\
PADDW ( MQ1, MA1 ) /* (t1/255 + q1) << 8 */ ;\
TWO(PADDW ( MQ2, MA2 )) /* (t2/255 + q2) << 8 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* sa1 | sb1 | sg1 | sr1 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* sa2 | sb2 | sg2 | sr2 */
/* linear interpolation - geometric series with roundoff
*
* this is a generalization of Blinn's formula to signed arithmetic
*
* note that M80 is a register with the 0x0080008000800080 constant
*/
#define GMB_LERP_GSR( MP1, MQ1, MA1, MP2, MQ2, MA2, M80) \
PSUBW ( MQ1, MP1 ) /* pa1 - qa1 | pb1 - qb1 | pg1 - qg1 | pr1 - qr1 */ ;\
TWO(PSUBW ( MQ2, MP2 )) /* pa2 - qa2 | pb2 - qb2 | pg2 - qg2 | pr2 - qr2 */ ;\
;\
PSLLW ( CONST(8), MQ1 ) /* q1 << 8 */ ;\
TWO(PSLLW ( CONST(8), MQ2 )) /* q2 << 8 */ ;\
;\
PMULLW ( MP1, MA1 ) /* t1 = (q1 - p1)*pa1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = (q2 - p2)*pa2 */ ;\
;\
PSRLW ( CONST(15), MP1 ) /* q1 > p1 ? 1 : 0 */ ;\
TWO(PSRLW ( CONST(15), MP2 )) /* q2 > q2 ? 1 : 0 */ ;\
;\
PSLLW ( CONST(8), MP1 ) /* q1 > p1 ? 0x100 : 0 */ ;\
TWO(PSLLW ( CONST(8), MP2 )) /* q2 > q2 ? 0x100 : 0 */ ;\
;\
PSUBW ( MP1, MA1 ) /* t1 -=? 0x100 */ ;\
TWO(PSUBW ( MP2, MA2 )) /* t2 -=? 0x100 */ ;\
;\
PADDW ( M80, MA1 ) /* t1 += 0x80 */ ;\
TWO(PADDW ( M80, MA2 )) /* t2 += 0x80 */ ;\
;\
MOVQ ( MA1, MP1 ) ;\
TWO(MOVQ ( MA2, MP2 )) ;\
;\
PSRLW ( CONST(8), MP1 ) /* t1 >> 8 */ ;\
TWO(PSRLW ( CONST(8), MP2 )) /* t2 >> 8 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) ~= (t2/255) << 8 */ ;\
;\
PADDW ( MQ1, MA1 ) /* (t1/255 + q1) << 8 */ ;\
TWO(PADDW ( MQ2, MA2 )) /* (t2/255 + q2) << 8 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* sa1 | sb1 | sg1 | sr1 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* sa2 | sb2 | sg2 | sr2 */
/* linear interpolation - geometric series with correction
*
* instead of the roundoff this adds a small correction to satisfy the OpenGL criteria
*
* t/255 ~= (t + (t >> 8) + (t >> 15)) >> 8
*
* note that although is faster than rounding off it doesn't give always the exact results
*/
#define GMB_LERP_GSC( MP1, MQ1, MA1, MP2, MQ2, MA2) \
PSUBW ( MQ1, MP1 ) /* pa1 - qa1 | pb1 - qb1 | pg1 - qg1 | pr1 - qr1 */ ;\
TWO(PSUBW ( MQ2, MP2 )) /* pa2 - qa2 | pb2 - qb2 | pg2 - qg2 | pr2 - qr2 */ ;\
;\
PSLLW ( CONST(8), MQ1 ) /* q1 << 8 */ ;\
TWO(PSLLW ( CONST(8), MQ2 )) /* q2 << 8 */ ;\
;\
PMULLW ( MP1, MA1 ) /* t1 = (q1 - p1)*pa1 */ ;\
TWO(PMULLW ( MP2, MA2 )) /* t2 = (q2 - p2)*pa2 */ ;\
;\
MOVQ ( MA1, MP1 ) ;\
TWO(MOVQ ( MA2, MP2 )) ;\
;\
PSRLW ( CONST(8), MP1 ) /* t1 >> 8 */ ;\
TWO(PSRLW ( CONST(8), MP2 )) /* t2 >> 8 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) ~= (t2/255) << 8 */ ;\
;\
PSRLW ( CONST(7), MP1 ) /* t1 >> 15 */ ;\
TWO(PSRLW ( CONST(7), MP2 )) /* t2 >> 15 */ ;\
;\
PADDW ( MP1, MA1 ) /* t1 + (t1 >> 8) + (t1 >>15) ~= (t1/255) << 8 */ ;\
TWO(PADDW ( MP2, MA2 )) /* t2 + (t2 >> 8) + (t2 >>15) ~= (t2/255) << 8 */ ;\
;\
PADDW ( MQ1, MA1 ) /* (t1/255 + q1) << 8 */ ;\
TWO(PADDW ( MQ2, MA2 )) /* (t2/255 + q2) << 8 */ ;\
;\
PSRLW ( CONST(8), MA1 ) /* sa1 | sb1 | sg1 | sr1 */ ;\
TWO(PSRLW ( CONST(8), MA2 )) /* sa2 | sb2 | sg2 | sr2 */
/* common blending initialization code
*/
#if 0 /* rounding not used */
SEG_DATA
ALIGNDATA8
const_80:
D_LONG 0x00800080, 0x00800080
#define GMB_INIT( M00, M80 ) \
PXOR ( M00, M00 ) /* 0x0000 | 0x0000 | 0x0000 | 0x0000 */
MOVQ ( CONTENT(const_80), M80 ) /* 0xffff | 0xffff | 0xffff | 0xffff */
#else
#define GMB_INIT( M00 ) \
PXOR ( M00, M00 ) /* 0x0000 | 0x0000 | 0x0000 | 0x0000 */
#endif
/* common blending loading code
*
* note that M00 is a register with 0x0000000000000000 constant which can be easily obtained making
*
* PXOR ( M00, M00 )
*/
#define GMB_LOAD(rgba, dest, MP1, MQ1, MA1, MP2, MQ2, MA2, M00) \
ONE(MOVD ( REGIND(rgba), MP1 )) /* | | | | qa1 | qb1 | qg1 | qr1 */ ;\
ONE(MOVD ( REGIND(dest), MQ1 )) /* | | | | pa1 | pb1 | pg1 | pr1 */ ;\
;\
TWO(MOVQ ( REGIND(rgba), MP1 )) /* qa2 | qb2 | qg2 | qr2 | qa1 | qb1 | qg1 | qr1 */ ;\
TWO(MOVQ ( REGIND(dest), MQ1 )) /* pa2 | pb2 | pg2 | pr2 | pa1 | pb1 | pg1 | pr1 */ ;\
;\
TWO(MOVQ ( MP1, MP2 )) ;\
TWO(MOVQ ( MQ1, MQ2 )) ;\
;\
PUNPCKLBW ( M00, MQ1 ) /* qa1 | qb1 | qg1 | qr1 */ ;\
TWO(PUNPCKHBW ( M00, MQ2 )) /* qa2 | qb2 | qg2 | qr2 */ ;\
PUNPCKLBW ( M00, MP1 ) /* pa1 | pb1 | pg1 | pr1 */ ;\
TWO(PUNPCKHBW ( M00, MP2 )) /* pa2 | pb2 | pg2 | pr2 */ ;\
;\
MOVQ ( MP1, MA1 ) ;\
TWO(MOVQ ( MP2, MA2 )) ;\
;\
PUNPCKHWD ( MA1, MA1 ) /* pa1 | pa1 | | */ ;\
TWO(PUNPCKHWD ( MA2, MA2 )) /* pa2 | pa2 | | */ ;\
PUNPCKHDQ ( MA1, MA1 ) /* pa1 | pa1 | pa1 | pa1 */ ;\
TWO(PUNPCKHDQ ( MA2, MA2 )) /* pa2 | pa2 | pa2 | pa2 */
/* common blending storing code
*/
#define GMB_STORE(rgba, MA1, MA2) \
PACKUSWB ( MA2, MA1 ) /* sa2 | sb2 | sg2 | sr2 | sa1 | sb1 | sg1 | sr1 */ ;\
;\
ONE(MOVD ( MA1, REGIND(rgba) )) ;\
TWO(MOVQ ( MA1, REGIND(rgba) ))
SEG_TEXT
/* common transparency blending mode
*/
#define TAG(x) x##_transparency
#define INIT \
GMB_INIT( MM0 )
#define MAIN \
GMB_LOAD( EDI, ESI, MM1, MM2, MM3, MM4, MM5, MM6, MM0) ;\
GMB_LERP_GSC( MM1, MM2, MM3, MM4, MM5, MM6 ) ;\
GMB_STORE( EDI, MM3, MM6 )
#include "mmx_blendtmp.h"
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