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/*
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
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