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https://git.code.sf.net/p/quake/quakeforge-old
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477 lines
9.9 KiB
ArmAsm
477 lines
9.9 KiB
ArmAsm
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//
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// d_parta.s
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// x86 assembly-language 8-bpp particle-drawing code.
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//
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#include "asm_i386.h"
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#include "quakeasm.h"
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#include "d_ifacea.h"
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#include "asm_draw.h"
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#if id386
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//----------------------------------------------------------------------
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// 8-bpp particle drawing code.
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//----------------------------------------------------------------------
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//FIXME: comments, full optimization
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//----------------------------------------------------------------------
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// 8-bpp particle queueing code.
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//----------------------------------------------------------------------
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.text
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#define P 12+4
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.align 4
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.globl C(D_DrawParticle)
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C(D_DrawParticle):
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pushl %ebp // preserve caller's stack frame
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pushl %edi // preserve register variables
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pushl %ebx
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movl P(%esp),%edi
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// FIXME: better FP overlap in general here
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// transform point
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// VectorSubtract (p->org, r_origin, local);
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flds C(r_origin)
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fsubrs pt_org(%edi)
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flds pt_org+4(%edi)
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fsubs C(r_origin)+4
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flds pt_org+8(%edi)
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fsubs C(r_origin)+8
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fxch %st(2) // local[0] | local[1] | local[2]
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// transformed[2] = DotProduct(local, r_ppn);
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flds C(r_ppn) // r_ppn[0] | local[0] | local[1] | local[2]
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fmul %st(1),%st(0) // dot0 | local[0] | local[1] | local[2]
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flds C(r_ppn)+4 // r_ppn[1] | dot0 | local[0] | local[1] | local[2]
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fmul %st(3),%st(0) // dot1 | dot0 | local[0] | local[1] | local[2]
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flds C(r_ppn)+8 // r_ppn[2] | dot1 | dot0 | local[0] |
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// local[1] | local[2]
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fmul %st(5),%st(0) // dot2 | dot1 | dot0 | local[0] | local[1] | local[2]
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fxch %st(2) // dot0 | dot1 | dot2 | local[0] | local[1] | local[2]
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faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[0] | local[1] |
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// local[2]
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faddp %st(0),%st(1) // z | local[0] | local[1] | local[2]
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fld %st(0) // z | z | local[0] | local[1] |
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// local[2]
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fdivrs float_1 // 1/z | z | local[0] | local[1] | local[2]
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fxch %st(1) // z | 1/z | local[0] | local[1] | local[2]
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// if (transformed[2] < PARTICLE_Z_CLIP)
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// return;
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fcomps float_particle_z_clip // 1/z | local[0] | local[1] | local[2]
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fxch %st(3) // local[2] | local[0] | local[1] | 1/z
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flds C(r_pup) // r_pup[0] | local[2] | local[0] | local[1] | 1/z
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fmul %st(2),%st(0) // dot0 | local[2] | local[0] | local[1] | 1/z
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flds C(r_pup)+4 // r_pup[1] | dot0 | local[2] | local[0] |
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// local[1] | 1/z
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fnstsw %ax
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testb $1,%ah
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jnz LPop6AndDone
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// transformed[1] = DotProduct(local, r_pup);
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fmul %st(4),%st(0) // dot1 | dot0 | local[2] | local[0] | local[1] | 1/z
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flds C(r_pup)+8 // r_pup[2] | dot1 | dot0 | local[2] |
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// local[0] | local[1] | 1/z
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fmul %st(3),%st(0) // dot2 | dot1 | dot0 | local[2] | local[0] |
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// local[1] | 1/z
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fxch %st(2) // dot0 | dot1 | dot2 | local[2] | local[0] |
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// local[1] | 1/z
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faddp %st(0),%st(1) // dot0 + dot1 | dot2 | local[2] | local[0] |
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// local[1] | 1/z
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faddp %st(0),%st(1) // y | local[2] | local[0] | local[1] | 1/z
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fxch %st(3) // local[1] | local[2] | local[0] | y | 1/z
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// transformed[0] = DotProduct(local, r_pright);
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fmuls C(r_pright)+4 // dot1 | local[2] | local[0] | y | 1/z
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fxch %st(2) // local[0] | local[2] | dot1 | y | 1/z
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fmuls C(r_pright) // dot0 | local[2] | dot1 | y | 1/z
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fxch %st(1) // local[2] | dot0 | dot1 | y | 1/z
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fmuls C(r_pright)+8 // dot2 | dot0 | dot1 | y | 1/z
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fxch %st(2) // dot1 | dot0 | dot2 | y | 1/z
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faddp %st(0),%st(1) // dot1 + dot0 | dot2 | y | 1/z
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faddp %st(0),%st(1) // x | y | 1/z
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fxch %st(1) // y | x | 1/z
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// project the point
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fmul %st(2),%st(0) // y/z | x | 1/z
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fxch %st(1) // x | y/z | 1/z
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fmul %st(2),%st(0) // x/z | y/z | 1/z
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fxch %st(1) // y/z | x/z | 1/z
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fsubrs C(ycenter) // v | x/z | 1/z
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fxch %st(1) // x/z | v | 1/z
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fadds C(xcenter) // u | v | 1/z
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// FIXME: preadjust xcenter and ycenter
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fxch %st(1) // v | u | 1/z
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fadds float_point5 // v | u | 1/z
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fxch %st(1) // u | v | 1/z
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fadds float_point5 // u | v | 1/z
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fxch %st(2) // 1/z | v | u
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fmuls DP_32768 // 1/z * 0x8000 | v | u
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fxch %st(2) // u | v | 1/z * 0x8000
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// FIXME: use Terje's fp->int trick here?
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// FIXME: check we're getting proper rounding here
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fistpl DP_u // v | 1/z * 0x8000
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fistpl DP_v // 1/z * 0x8000
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movl DP_u,%eax
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movl DP_v,%edx
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// if ((v > d_vrectbottom_particle) ||
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// (u > d_vrectright_particle) ||
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// (v < d_vrecty) ||
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// (u < d_vrectx))
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// {
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// continue;
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// }
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movl C(d_vrectbottom_particle),%ebx
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movl C(d_vrectright_particle),%ecx
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cmpl %ebx,%edx
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jg LPop1AndDone
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cmpl %ecx,%eax
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jg LPop1AndDone
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movl C(d_vrecty),%ebx
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movl C(d_vrectx),%ecx
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cmpl %ebx,%edx
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jl LPop1AndDone
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cmpl %ecx,%eax
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jl LPop1AndDone
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flds pt_color(%edi) // color | 1/z * 0x8000
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// FIXME: use Terje's fast fp->int trick?
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fistpl DP_Color // 1/z * 0x8000
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movl C(d_viewbuffer),%ebx
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addl %eax,%ebx
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movl C(d_scantable)(,%edx,4),%edi // point to the pixel
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imull C(d_zrowbytes),%edx // point to the z pixel
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leal (%edx,%eax,2),%edx
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movl C(d_pzbuffer),%eax
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fistpl izi
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addl %ebx,%edi
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addl %eax,%edx
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// pix = izi >> d_pix_shift;
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movl izi,%eax
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movl C(d_pix_shift),%ecx
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shrl %cl,%eax
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movl izi,%ebp
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// if (pix < d_pix_min)
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// pix = d_pix_min;
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// else if (pix > d_pix_max)
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// pix = d_pix_max;
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movl C(d_pix_min),%ebx
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movl C(d_pix_max),%ecx
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cmpl %ebx,%eax
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jnl LTestPixMax
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movl %ebx,%eax
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jmp LTestDone
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LTestPixMax:
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cmpl %ecx,%eax
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jng LTestDone
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movl %ecx,%eax
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LTestDone:
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movb DP_Color,%ch
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movl C(d_y_aspect_shift),%ebx
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testl %ebx,%ebx
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jnz LDefault
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cmpl $4,%eax
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ja LDefault
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jmp DP_EntryTable-4(,%eax,4)
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// 1x1
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.globl DP_1x1
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DP_1x1:
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cmpw %bp,(%edx) // just one pixel to do
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jg LDone
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movw %bp,(%edx)
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movb %ch,(%edi)
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jmp LDone
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// 2x2
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.globl DP_2x2
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DP_2x2:
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pushl %esi
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movl C(screenwidth),%ebx
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movl C(d_zrowbytes),%esi
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cmpw %bp,(%edx)
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jg L2x2_1
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movw %bp,(%edx)
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movb %ch,(%edi)
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L2x2_1:
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cmpw %bp,2(%edx)
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jg L2x2_2
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movw %bp,2(%edx)
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movb %ch,1(%edi)
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L2x2_2:
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cmpw %bp,(%edx,%esi,1)
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jg L2x2_3
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movw %bp,(%edx,%esi,1)
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movb %ch,(%edi,%ebx,1)
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L2x2_3:
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cmpw %bp,2(%edx,%esi,1)
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jg L2x2_4
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movw %bp,2(%edx,%esi,1)
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movb %ch,1(%edi,%ebx,1)
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L2x2_4:
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popl %esi
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jmp LDone
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// 3x3
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.globl DP_3x3
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DP_3x3:
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pushl %esi
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movl C(screenwidth),%ebx
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movl C(d_zrowbytes),%esi
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cmpw %bp,(%edx)
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jg L3x3_1
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movw %bp,(%edx)
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movb %ch,(%edi)
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L3x3_1:
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cmpw %bp,2(%edx)
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jg L3x3_2
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movw %bp,2(%edx)
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movb %ch,1(%edi)
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L3x3_2:
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cmpw %bp,4(%edx)
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jg L3x3_3
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movw %bp,4(%edx)
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movb %ch,2(%edi)
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L3x3_3:
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cmpw %bp,(%edx,%esi,1)
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jg L3x3_4
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movw %bp,(%edx,%esi,1)
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movb %ch,(%edi,%ebx,1)
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L3x3_4:
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cmpw %bp,2(%edx,%esi,1)
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jg L3x3_5
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movw %bp,2(%edx,%esi,1)
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movb %ch,1(%edi,%ebx,1)
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L3x3_5:
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cmpw %bp,4(%edx,%esi,1)
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jg L3x3_6
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movw %bp,4(%edx,%esi,1)
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movb %ch,2(%edi,%ebx,1)
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L3x3_6:
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cmpw %bp,(%edx,%esi,2)
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jg L3x3_7
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movw %bp,(%edx,%esi,2)
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movb %ch,(%edi,%ebx,2)
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L3x3_7:
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cmpw %bp,2(%edx,%esi,2)
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jg L3x3_8
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movw %bp,2(%edx,%esi,2)
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movb %ch,1(%edi,%ebx,2)
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L3x3_8:
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cmpw %bp,4(%edx,%esi,2)
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jg L3x3_9
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movw %bp,4(%edx,%esi,2)
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movb %ch,2(%edi,%ebx,2)
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L3x3_9:
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popl %esi
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jmp LDone
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// 4x4
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.globl DP_4x4
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DP_4x4:
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pushl %esi
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movl C(screenwidth),%ebx
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movl C(d_zrowbytes),%esi
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cmpw %bp,(%edx)
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jg L4x4_1
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movw %bp,(%edx)
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movb %ch,(%edi)
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L4x4_1:
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cmpw %bp,2(%edx)
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jg L4x4_2
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movw %bp,2(%edx)
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movb %ch,1(%edi)
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L4x4_2:
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cmpw %bp,4(%edx)
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jg L4x4_3
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movw %bp,4(%edx)
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movb %ch,2(%edi)
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L4x4_3:
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cmpw %bp,6(%edx)
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jg L4x4_4
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movw %bp,6(%edx)
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movb %ch,3(%edi)
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L4x4_4:
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cmpw %bp,(%edx,%esi,1)
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jg L4x4_5
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movw %bp,(%edx,%esi,1)
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movb %ch,(%edi,%ebx,1)
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L4x4_5:
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cmpw %bp,2(%edx,%esi,1)
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jg L4x4_6
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movw %bp,2(%edx,%esi,1)
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movb %ch,1(%edi,%ebx,1)
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L4x4_6:
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cmpw %bp,4(%edx,%esi,1)
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jg L4x4_7
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movw %bp,4(%edx,%esi,1)
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movb %ch,2(%edi,%ebx,1)
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L4x4_7:
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cmpw %bp,6(%edx,%esi,1)
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jg L4x4_8
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movw %bp,6(%edx,%esi,1)
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movb %ch,3(%edi,%ebx,1)
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L4x4_8:
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leal (%edx,%esi,2),%edx
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leal (%edi,%ebx,2),%edi
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cmpw %bp,(%edx)
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jg L4x4_9
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movw %bp,(%edx)
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movb %ch,(%edi)
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L4x4_9:
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cmpw %bp,2(%edx)
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jg L4x4_10
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movw %bp,2(%edx)
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movb %ch,1(%edi)
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L4x4_10:
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cmpw %bp,4(%edx)
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jg L4x4_11
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movw %bp,4(%edx)
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movb %ch,2(%edi)
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L4x4_11:
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cmpw %bp,6(%edx)
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jg L4x4_12
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movw %bp,6(%edx)
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movb %ch,3(%edi)
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L4x4_12:
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cmpw %bp,(%edx,%esi,1)
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jg L4x4_13
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movw %bp,(%edx,%esi,1)
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movb %ch,(%edi,%ebx,1)
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L4x4_13:
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cmpw %bp,2(%edx,%esi,1)
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jg L4x4_14
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movw %bp,2(%edx,%esi,1)
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movb %ch,1(%edi,%ebx,1)
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L4x4_14:
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cmpw %bp,4(%edx,%esi,1)
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jg L4x4_15
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movw %bp,4(%edx,%esi,1)
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movb %ch,2(%edi,%ebx,1)
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L4x4_15:
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cmpw %bp,6(%edx,%esi,1)
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jg L4x4_16
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movw %bp,6(%edx,%esi,1)
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movb %ch,3(%edi,%ebx,1)
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L4x4_16:
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popl %esi
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jmp LDone
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// default case, handling any size particle
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LDefault:
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// count = pix << d_y_aspect_shift;
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movl %eax,%ebx
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movl %eax,DP_Pix
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movb C(d_y_aspect_shift),%cl
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shll %cl,%ebx
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// for ( ; count ; count--, pz += d_zwidth, pdest += screenwidth)
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// {
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// for (i=0 ; i<pix ; i++)
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// {
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// if (pz[i] <= izi)
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// {
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// pz[i] = izi;
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// pdest[i] = color;
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// }
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// }
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// }
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LGenRowLoop:
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movl DP_Pix,%eax
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LGenColLoop:
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cmpw %bp,-2(%edx,%eax,2)
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jg LGSkip
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movw %bp,-2(%edx,%eax,2)
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movb %ch,-1(%edi,%eax,1)
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LGSkip:
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decl %eax // --pix
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jnz LGenColLoop
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addl C(d_zrowbytes),%edx
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addl C(screenwidth),%edi
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decl %ebx // --count
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jnz LGenRowLoop
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LDone:
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popl %ebx // restore register variables
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popl %edi
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popl %ebp // restore the caller's stack frame
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ret
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LPop6AndDone:
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fstp %st(0)
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fstp %st(0)
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fstp %st(0)
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fstp %st(0)
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fstp %st(0)
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LPop1AndDone:
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fstp %st(0)
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jmp LDone
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#endif // id386
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