diff options
Diffstat (limited to 'WinQuake/d_parta.s')
| -rw-r--r-- | WinQuake/d_parta.s | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/WinQuake/d_parta.s b/WinQuake/d_parta.s new file mode 100644 index 0000000..b32f1bc --- /dev/null +++ b/WinQuake/d_parta.s @@ -0,0 +1,477 @@ +/* +Copyright (C) 1996-1997 Id Software, Inc. + +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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +*/ +// +// d_parta.s +// x86 assembly-language 8-bpp particle-drawing code. +// + +#include "asm_i386.h" +#include "quakeasm.h" +#include "d_ifacea.h" +#include "asm_draw.h" + +#if id386 + +//---------------------------------------------------------------------- +// 8-bpp particle drawing code. +//---------------------------------------------------------------------- + +//FIXME: comments, full optimization + +//---------------------------------------------------------------------- +// 8-bpp particle queueing code. +//---------------------------------------------------------------------- + + .text + +#define P 12+4 + + .align 4 +.globl C(D_DrawParticle) +C(D_DrawParticle): + pushl %ebp // preserve caller's stack frame + pushl %edi // preserve register variables + pushl %ebx + + movl P(%esp),%edi + +// FIXME: better FP overlap in general here + +// transform point +// VectorSubtract (p->org, r_origin, local); + flds C(r_origin) + fsubrs pt_org(%edi) + flds pt_org+4(%edi) + fsubs C(r_origin)+4 + flds pt_org+8(%edi) + fsubs C(r_origin)+8 + fxch %st(2) // local[0] | local[1] | local[2] + +// transformed[2] = DotProduct(local, r_ppn); + flds C(r_ppn) // r_ppn[0] | local[0] | local[1] | local[2] + fmul %st(1),%st(0) // dot0 | local[0] | local[1] | local[2] + flds C(r_ppn)+4 // r_ppn[1] | dot0 | local[0] | local[1] | local[2] + fmul %st(3),%st(0) // dot1 | dot0 | local[0] | local[1] | local[2] + flds C(r_ppn)+8 // r_ppn[2] | dot1 | dot0 | local[0] | + // local[1] | local[2] + fmul %st(5),%st(0) // dot2 | dot1 | dot0 | local[0] | local[1] | local[2] + fxch %st(2) // dot0 | dot1 | dot2 | local[0] | local[1] | local[2] + faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[0] | local[1] | + // local[2] + faddp %st(0),%st(1) // z | local[0] | local[1] | local[2] + fld %st(0) // z | z | local[0] | local[1] | + // local[2] + fdivrs float_1 // 1/z | z | local[0] | local[1] | local[2] + fxch %st(1) // z | 1/z | local[0] | local[1] | local[2] + +// if (transformed[2] < PARTICLE_Z_CLIP) +// return; + fcomps float_particle_z_clip // 1/z | local[0] | local[1] | local[2] + fxch %st(3) // local[2] | local[0] | local[1] | 1/z + + flds C(r_pup) // r_pup[0] | local[2] | local[0] | local[1] | 1/z + fmul %st(2),%st(0) // dot0 | local[2] | local[0] | local[1] | 1/z + flds C(r_pup)+4 // r_pup[1] | dot0 | local[2] | local[0] | + // local[1] | 1/z + + fnstsw %ax + testb $1,%ah + jnz LPop6AndDone + +// transformed[1] = DotProduct(local, r_pup); + fmul %st(4),%st(0) // dot1 | dot0 | local[2] | local[0] | local[1] | 1/z + flds C(r_pup)+8 // r_pup[2] | dot1 | dot0 | local[2] | + // local[0] | local[1] | 1/z + fmul %st(3),%st(0) // dot2 | dot1 | dot0 | local[2] | local[0] | + // local[1] | 1/z + fxch %st(2) // dot0 | dot1 | dot2 | local[2] | local[0] | + // local[1] | 1/z + faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[2] | local[0] | + // local[1] | 1/z + faddp %st(0),%st(1) // y | local[2] | local[0] | local[1] | 1/z + fxch %st(3) // local[1] | local[2] | local[0] | y | 1/z + +// transformed[0] = DotProduct(local, r_pright); + fmuls C(r_pright)+4 // dot1 | local[2] | local[0] | y | 1/z + fxch %st(2) // local[0] | local[2] | dot1 | y | 1/z + fmuls C(r_pright) // dot0 | local[2] | dot1 | y | 1/z + fxch %st(1) // local[2] | dot0 | dot1 | y | 1/z + fmuls C(r_pright)+8 // dot2 | dot0 | dot1 | y | 1/z + fxch %st(2) // dot1 | dot0 | dot2 | y | 1/z + faddp %st(0),%st(1) // dot1 + dot0 | dot2 | y | 1/z + + faddp %st(0),%st(1) // x | y | 1/z + fxch %st(1) // y | x | 1/z + +// project the point + fmul %st(2),%st(0) // y/z | x | 1/z + fxch %st(1) // x | y/z | 1/z + fmul %st(2),%st(0) // x/z | y/z | 1/z + fxch %st(1) // y/z | x/z | 1/z + fsubrs C(ycenter) // v | x/z | 1/z + fxch %st(1) // x/z | v | 1/z + fadds C(xcenter) // u | v | 1/z +// FIXME: preadjust xcenter and ycenter + fxch %st(1) // v | u | 1/z + fadds float_point5 // v | u | 1/z + fxch %st(1) // u | v | 1/z + fadds float_point5 // u | v | 1/z + fxch %st(2) // 1/z | v | u + fmuls DP_32768 // 1/z * 0x8000 | v | u + fxch %st(2) // u | v | 1/z * 0x8000 + +// FIXME: use Terje's fp->int trick here? +// FIXME: check we're getting proper rounding here + fistpl DP_u // v | 1/z * 0x8000 + fistpl DP_v // 1/z * 0x8000 + + movl DP_u,%eax + movl DP_v,%edx + +// if ((v > d_vrectbottom_particle) || +// (u > d_vrectright_particle) || +// (v < d_vrecty) || +// (u < d_vrectx)) +// { +// continue; +// } + + movl C(d_vrectbottom_particle),%ebx + movl C(d_vrectright_particle),%ecx + cmpl %ebx,%edx + jg LPop1AndDone + cmpl %ecx,%eax + jg LPop1AndDone + movl C(d_vrecty),%ebx + movl C(d_vrectx),%ecx + cmpl %ebx,%edx + jl LPop1AndDone + + cmpl %ecx,%eax + jl LPop1AndDone + + flds pt_color(%edi) // color | 1/z * 0x8000 +// FIXME: use Terje's fast fp->int trick? + fistpl DP_Color // 1/z * 0x8000 + + movl C(d_viewbuffer),%ebx + + addl %eax,%ebx + movl C(d_scantable)(,%edx,4),%edi // point to the pixel + + imull C(d_zrowbytes),%edx // point to the z pixel + + leal (%edx,%eax,2),%edx + movl C(d_pzbuffer),%eax + + fistpl izi + + addl %ebx,%edi + addl %eax,%edx + +// pix = izi >> d_pix_shift; + + movl izi,%eax + movl C(d_pix_shift),%ecx + shrl %cl,%eax + movl izi,%ebp + +// if (pix < d_pix_min) +// pix = d_pix_min; +// else if (pix > d_pix_max) +// pix = d_pix_max; + + movl C(d_pix_min),%ebx + movl C(d_pix_max),%ecx + cmpl %ebx,%eax + jnl LTestPixMax + movl %ebx,%eax + jmp LTestDone + +LTestPixMax: + cmpl %ecx,%eax + jng LTestDone + movl %ecx,%eax +LTestDone: + + movb DP_Color,%ch + + movl C(d_y_aspect_shift),%ebx + testl %ebx,%ebx + jnz LDefault + + cmpl $4,%eax + ja LDefault + + jmp DP_EntryTable-4(,%eax,4) + +// 1x1 +.globl DP_1x1 +DP_1x1: + cmpw %bp,(%edx) // just one pixel to do + jg LDone + movw %bp,(%edx) + movb %ch,(%edi) + jmp LDone + +// 2x2 +.globl DP_2x2 +DP_2x2: + pushl %esi + movl C(screenwidth),%ebx + movl C(d_zrowbytes),%esi + + cmpw %bp,(%edx) + jg L2x2_1 + movw %bp,(%edx) + movb %ch,(%edi) +L2x2_1: + cmpw %bp,2(%edx) + jg L2x2_2 + movw %bp,2(%edx) + movb %ch,1(%edi) +L2x2_2: + cmpw %bp,(%edx,%esi,1) + jg L2x2_3 + movw %bp,(%edx,%esi,1) + movb %ch,(%edi,%ebx,1) +L2x2_3: + cmpw %bp,2(%edx,%esi,1) + jg L2x2_4 + movw %bp,2(%edx,%esi,1) + movb %ch,1(%edi,%ebx,1) +L2x2_4: + + popl %esi + jmp LDone + +// 3x3 +.globl DP_3x3 +DP_3x3: + pushl %esi + movl C(screenwidth),%ebx + movl C(d_zrowbytes),%esi + + cmpw %bp,(%edx) + jg L3x3_1 + movw %bp,(%edx) + movb %ch,(%edi) +L3x3_1: + cmpw %bp,2(%edx) + jg L3x3_2 + movw %bp,2(%edx) + movb %ch,1(%edi) +L3x3_2: + cmpw %bp,4(%edx) + jg L3x3_3 + movw %bp,4(%edx) + movb %ch,2(%edi) +L3x3_3: + + cmpw %bp,(%edx,%esi,1) + jg L3x3_4 + movw %bp,(%edx,%esi,1) + movb %ch,(%edi,%ebx,1) +L3x3_4: + cmpw %bp,2(%edx,%esi,1) + jg L3x3_5 + movw %bp,2(%edx,%esi,1) + movb %ch,1(%edi,%ebx,1) +L3x3_5: + cmpw %bp,4(%edx,%esi,1) + jg L3x3_6 + movw %bp,4(%edx,%esi,1) + movb %ch,2(%edi,%ebx,1) +L3x3_6: + + cmpw %bp,(%edx,%esi,2) + jg L3x3_7 + movw %bp,(%edx,%esi,2) + movb %ch,(%edi,%ebx,2) +L3x3_7: + cmpw %bp,2(%edx,%esi,2) + jg L3x3_8 + movw %bp,2(%edx,%esi,2) + movb %ch,1(%edi,%ebx,2) +L3x3_8: + cmpw %bp,4(%edx,%esi,2) + jg L3x3_9 + movw %bp,4(%edx,%esi,2) + movb %ch,2(%edi,%ebx,2) +L3x3_9: + + popl %esi + jmp LDone + + +// 4x4 +.globl DP_4x4 +DP_4x4: + pushl %esi + movl C(screenwidth),%ebx + movl C(d_zrowbytes),%esi + + cmpw %bp,(%edx) + jg L4x4_1 + movw %bp,(%edx) + movb %ch,(%edi) +L4x4_1: + cmpw %bp,2(%edx) + jg L4x4_2 + movw %bp,2(%edx) + movb %ch,1(%edi) +L4x4_2: + cmpw %bp,4(%edx) + jg L4x4_3 + movw %bp,4(%edx) + movb %ch,2(%edi) +L4x4_3: + cmpw %bp,6(%edx) + jg L4x4_4 + movw %bp,6(%edx) + movb %ch,3(%edi) +L4x4_4: + + cmpw %bp,(%edx,%esi,1) + jg L4x4_5 + movw %bp,(%edx,%esi,1) + movb %ch,(%edi,%ebx,1) +L4x4_5: + cmpw %bp,2(%edx,%esi,1) + jg L4x4_6 + movw %bp,2(%edx,%esi,1) + movb %ch,1(%edi,%ebx,1) +L4x4_6: + cmpw %bp,4(%edx,%esi,1) + jg L4x4_7 + movw %bp,4(%edx,%esi,1) + movb %ch,2(%edi,%ebx,1) +L4x4_7: + cmpw %bp,6(%edx,%esi,1) + jg L4x4_8 + movw %bp,6(%edx,%esi,1) + movb %ch,3(%edi,%ebx,1) +L4x4_8: + + leal (%edx,%esi,2),%edx + leal (%edi,%ebx,2),%edi + + cmpw %bp,(%edx) + jg L4x4_9 + movw %bp,(%edx) + movb %ch,(%edi) +L4x4_9: + cmpw %bp,2(%edx) + jg L4x4_10 + movw %bp,2(%edx) + movb %ch,1(%edi) +L4x4_10: + cmpw %bp,4(%edx) + jg L4x4_11 + movw %bp,4(%edx) + movb %ch,2(%edi) +L4x4_11: + cmpw %bp,6(%edx) + jg L4x4_12 + movw %bp,6(%edx) + movb %ch,3(%edi) +L4x4_12: + + cmpw %bp,(%edx,%esi,1) + jg L4x4_13 + movw %bp,(%edx,%esi,1) + movb %ch,(%edi,%ebx,1) +L4x4_13: + cmpw %bp,2(%edx,%esi,1) + jg L4x4_14 + movw %bp,2(%edx,%esi,1) + movb %ch,1(%edi,%ebx,1) +L4x4_14: + cmpw %bp,4(%edx,%esi,1) + jg L4x4_15 + movw %bp,4(%edx,%esi,1) + movb %ch,2(%edi,%ebx,1) +L4x4_15: + cmpw %bp,6(%edx,%esi,1) + jg L4x4_16 + movw %bp,6(%edx,%esi,1) + movb %ch,3(%edi,%ebx,1) +L4x4_16: + + popl %esi + jmp LDone + +// default case, handling any size particle +LDefault: + +// count = pix << d_y_aspect_shift; + + movl %eax,%ebx + movl %eax,DP_Pix + movb C(d_y_aspect_shift),%cl + shll %cl,%ebx + +// for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth) +// { +// for (i=0 ; i<pix ; i++) +// { +// if (pz[i] <= izi) +// { +// pz[i] = izi; +// pdest[i] = color; +// } +// } +// } + +LGenRowLoop: + movl DP_Pix,%eax + +LGenColLoop: + cmpw %bp,-2(%edx,%eax,2) + jg LGSkip + movw %bp,-2(%edx,%eax,2) + movb %ch,-1(%edi,%eax,1) +LGSkip: + decl %eax // --pix + jnz LGenColLoop + + addl C(d_zrowbytes),%edx + addl C(screenwidth),%edi + + decl %ebx // --count + jnz LGenRowLoop + +LDone: + popl %ebx // restore register variables + popl %edi + popl %ebp // restore the caller's stack frame + ret + +LPop6AndDone: + fstp %st(0) + fstp %st(0) + fstp %st(0) + fstp %st(0) + fstp %st(0) +LPop1AndDone: + fstp %st(0) + jmp LDone + +#endif // id386 |