?? r_drawa.s

?? 著名游戲quake2原代碼最新版本(vc6.0可以編譯的)
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	jz		LDoFirst
	cmpl	%eax,et_u(%esi)
	jl		LNotFirst
LDoFirst:

//		edge->next = newedges[v];
//		newedges[v] = edge;
	movl	%esi,et_next(%edi)
	movl	%edi,C(newedges)(,%ebx,4)

	jmp		LSetRemove

//	}

LNotFirst:

//	else
//	{
//		pcheck = newedges[v];
//
//		while (pcheck->next && pcheck->next->u < u_check)
//			pcheck = pcheck->next;
LFindInsertLoop:
	movl	%esi,%edx
	movl	et_next(%esi),%esi
	testl	%esi,%esi
	jz		LInsertFound
	cmpl	%eax,et_u(%esi)
	jl		LFindInsertLoop

LInsertFound:

//		edge->next = pcheck->next;
//		pcheck->next = edge;
	movl	%esi,et_next(%edi)
	movl	%edi,et_next(%edx)

//	}

LSetRemove:

//	edge->nextremove = removeedges[v2];
//	removeedges[v2] = edge;
	movl	C(removeedges)(,%ecx,4),%eax
	movl	%edi,C(removeedges)(,%ecx,4)
	movl	%eax,et_nextremove(%edi)

Ldone:
	movl	Lstack,%esp			// clear temporary variables from stack

	popl	%ebx				// restore register variables
	popl	%edi
	popl	%esi
	ret

// at least one point is clipped

Lp2:
	testl	%eax,%eax
	jns		Lp1

//			else
//			{
//			// point 0 is clipped

//				if (d1 < 0)
//				{
	movl	Ld1,%eax
	testl	%eax,%eax
	jns		Lp3

//				// both points are clipped
//				// we do cache fully clipped edges
//					if (!leftclipped)
	movl	C(r_leftclipped),%eax
	movl	C(r_pedge),%ecx
	testl	%eax,%eax
	jnz		Ldone

//						r_pedge->framecount = r_framecount;
	movl	C(r_framecount),%eax
	andl	$(FRAMECOUNT_MASK),%eax
	orl		$(FULLY_CLIPPED_CACHED),%eax
	movl	%eax,C(cacheoffset)

//					return;
	jmp		Ldone

//				}

Lp1:

//			// point 0 is unclipped
//				if (d1 >= 0)
//				{
//				// both points are unclipped
//					continue;

//			// only point 1 is clipped

//				f = d0 / (d0 - d1);
	flds	Ld0
	flds	Ld1
	fsubr	%st(1),%st(0)

//			// we don't cache partially clipped edges
	movl	$0x7FFFFFFF,C(cacheoffset)

	fdivrp	%st(0),%st(1)

	subl	$(mv_size),%esp			// allocate space for clipvert

//				clipvert.position[0] = pv0->position[0] +
//						f * (pv1->position[0] - pv0->position[0]);
//				clipvert.position[1] = pv0->position[1] +
//						f * (pv1->position[1] - pv0->position[1]);
//				clipvert.position[2] = pv0->position[2] +
//						f * (pv1->position[2] - pv0->position[2]);
	flds	mv_position+8(%edx)
	fsubs	mv_position+8(%esi)
	flds	mv_position+4(%edx)
	fsubs	mv_position+4(%esi)
	flds	mv_position+0(%edx)
	fsubs	mv_position+0(%esi)		// 0 | 1 | 2

// replace pv1 with the clip point
	movl	%esp,%edx
	movl	cp_leftedge(%ebx),%eax
	testb	%al,%al

	fmul	%st(3),%st(0)
	fxch	%st(1)					// 1 | 0 | 2
	fmul	%st(3),%st(0)
	fxch	%st(2)					// 2 | 0 | 1
	fmulp	%st(0),%st(3)			// 0 | 1 | 2
	fadds	mv_position+0(%esi)
	fxch	%st(1)					// 1 | 0 | 2
	fadds	mv_position+4(%esi)
	fxch	%st(2)					// 2 | 0 | 1
	fadds	mv_position+8(%esi)
	fxch	%st(1)					// 0 | 2 | 1
	fstps	mv_position+0(%esp)		// 2 | 1
	fstps	mv_position+8(%esp)		// 1
	fstps	mv_position+4(%esp)

//				if (clip->leftedge)
//				{
	jz		Ltestright

//					r_leftclipped = true;
//					r_leftexit = clipvert;
	movl	$1,C(r_leftclipped)
	movl	mv_position+0(%esp),%eax
	movl	%eax,C(r_leftexit)+mv_position+0
	movl	mv_position+4(%esp),%eax
	movl	%eax,C(r_leftexit)+mv_position+4
	movl	mv_position+8(%esp),%eax
	movl	%eax,C(r_leftexit)+mv_position+8

	jmp		Lcontinue

//				}

Ltestright:
//				else if (clip->rightedge)
//				{
	testb	%ah,%ah
	jz		Lcontinue

//					r_rightclipped = true;
//					r_rightexit = clipvert;
	movl	$1,C(r_rightclipped)
	movl	mv_position+0(%esp),%eax
	movl	%eax,C(r_rightexit)+mv_position+0
	movl	mv_position+4(%esp),%eax
	movl	%eax,C(r_rightexit)+mv_position+4
	movl	mv_position+8(%esp),%eax
	movl	%eax,C(r_rightexit)+mv_position+8

//				}
//
//				R_ClipEdge (pv0, &clipvert, clip->next);
//				return;
//			}
	jmp		Lcontinue

//			}

Lp3:

//			// only point 0 is clipped
//				r_lastvertvalid = false;

	movl	$0,C(r_lastvertvalid)

//				f = d0 / (d0 - d1);
	flds	Ld0
	flds	Ld1
	fsubr	%st(1),%st(0)

//			// we don't cache partially clipped edges
	movl	$0x7FFFFFFF,C(cacheoffset)

	fdivrp	%st(0),%st(1)

	subl	$(mv_size),%esp			// allocate space for clipvert

//				clipvert.position[0] = pv0->position[0] +
//						f * (pv1->position[0] - pv0->position[0]);
//				clipvert.position[1] = pv0->position[1] +
//						f * (pv1->position[1] - pv0->position[1]);
//				clipvert.position[2] = pv0->position[2] +
//						f * (pv1->position[2] - pv0->position[2]);
	flds	mv_position+8(%edx)
	fsubs	mv_position+8(%esi)
	flds	mv_position+4(%edx)
	fsubs	mv_position+4(%esi)
	flds	mv_position+0(%edx)
	fsubs	mv_position+0(%esi)		// 0 | 1 | 2

	movl	cp_leftedge(%ebx),%eax
	testb	%al,%al

	fmul	%st(3),%st(0)
	fxch	%st(1)					// 1 | 0 | 2
	fmul	%st(3),%st(0)
	fxch	%st(2)					// 2 | 0 | 1
	fmulp	%st(0),%st(3)			// 0 | 1 | 2
	fadds	mv_position+0(%esi)
	fxch	%st(1)					// 1 | 0 | 2
	fadds	mv_position+4(%esi)
	fxch	%st(2)					// 2 | 0 | 1
	fadds	mv_position+8(%esi)
	fxch	%st(1)					// 0 | 2 | 1
	fstps	mv_position+0(%esp)		// 2 | 1
	fstps	mv_position+8(%esp)		// 1
	fstps	mv_position+4(%esp)

// replace pv0 with the clip point
	movl	%esp,%esi

//				if (clip->leftedge)
//				{
	jz		Ltestright2

//					r_leftclipped = true;
//					r_leftenter = clipvert;
	movl	$1,C(r_leftclipped)
	movl	mv_position+0(%esp),%eax
	movl	%eax,C(r_leftenter)+mv_position+0
	movl	mv_position+4(%esp),%eax
	movl	%eax,C(r_leftenter)+mv_position+4
	movl	mv_position+8(%esp),%eax
	movl	%eax,C(r_leftenter)+mv_position+8

	jmp		Lcontinue

//				}

Ltestright2:
//				else if (clip->rightedge)
//				{
	testb	%ah,%ah
	jz		Lcontinue

//					r_rightclipped = true;
//					r_rightenter = clipvert;
	movl	$1,C(r_rightclipped)
	movl	mv_position+0(%esp),%eax
	movl	%eax,C(r_rightenter)+mv_position+0
	movl	mv_position+4(%esp),%eax
	movl	%eax,C(r_rightenter)+mv_position+4
	movl	mv_position+8(%esp),%eax
	movl	%eax,C(r_rightenter)+mv_position+8

//				}
	jmp		Lcontinue

// %esi = vec3_t point to transform and project
// %edx preserved
LTransformAndProject:

//	// transform and project
//		VectorSubtract (world, modelorg, local);
	flds	mv_position+0(%esi)
	fsubs	C(modelorg)+0
	flds	mv_position+4(%esi)
	fsubs	C(modelorg)+4
	flds	mv_position+8(%esi)	
	fsubs	C(modelorg)+8
	fxch	%st(2)				// local[0] | local[1] | local[2]

//		TransformVector (local, transformed);
//	
//		if (transformed[2] < NEAR_CLIP)
//			transformed[2] = NEAR_CLIP;
//	
//		lzi0 = 1.0 / transformed[2];
	fld		%st(0)				// local[0] | local[0] | local[1] | local[2]
	fmuls	C(vpn)+0			// zm0 | local[0] | local[1] | local[2]
	fld		%st(1)				// local[0] | zm0 | local[0] | local[1] |
								//  local[2]
	fmuls	C(vright)+0			// xm0 | zm0 | local[0] | local[1] | local[2]
	fxch	%st(2)				// local[0] | zm0 | xm0 | local[1] | local[2]
	fmuls	C(vup)+0			// ym0 |  zm0 | xm0 | local[1] | local[2]
	fld		%st(3)				// local[1] | ym0 |  zm0 | xm0 | local[1] |
								//  local[2]
	fmuls	C(vpn)+4			// zm1 | ym0 | zm0 | xm0 | local[1] |
								//  local[2]
	fld		%st(4)				// local[1] | zm1 | ym0 | zm0 | xm0 |
								//  local[1] | local[2]
	fmuls	C(vright)+4			// xm1 | zm1 | ym0 |  zm0 | xm0 |
								//  local[1] | local[2]
	fxch	%st(5)				// local[1] | zm1 | ym0 | zm0 | xm0 |
								//  xm1 | local[2]
	fmuls	C(vup)+4			// ym1 | zm1 | ym0 | zm0 | xm0 |
								//  xm1 | local[2]
	fxch	%st(1)				// zm1 | ym1 | ym0 | zm0 | xm0 |
								//  xm1 | local[2]
	faddp	%st(0),%st(3)		// ym1 | ym0 | zm2 | xm0 | xm1 | local[2]
	fxch	%st(3)				// xm0 | ym0 | zm2 | ym1 | xm1 | local[2]
	faddp	%st(0),%st(4)		// ym0 | zm2 | ym1 | xm2 | local[2]
	faddp	%st(0),%st(2)		// zm2 | ym2 | xm2 | local[2]
	fld		%st(3)				// local[2] | zm2 | ym2 | xm2 | local[2]
	fmuls	C(vpn)+8			// zm3 | zm2 | ym2 | xm2 | local[2]
	fld		%st(4)				// local[2] | zm3 | zm2 | ym2 | xm2 | local[2]
	fmuls	C(vright)+8			// xm3 | zm3 | zm2 | ym2 | xm2 | local[2]
	fxch	%st(5)				// local[2] | zm3 | zm2 | ym2 | xm2 | xm3
	fmuls	C(vup)+8			// ym3 | zm3 | zm2 | ym2 | xm2 | xm3
	fxch	%st(1)				// zm3 | ym3 | zm2 | ym2 | xm2 | xm3
	faddp	%st(0),%st(2)		// ym3 | zm4 | ym2 | xm2 | xm3
	fxch	%st(4)				// xm3 | zm4 | ym2 | xm2 | ym3
	faddp	%st(0),%st(3)		// zm4 | ym2 | xm4 | ym3
	fxch	%st(1)				// ym2 | zm4 | xm4 | ym3
	faddp	%st(0),%st(3)		// zm4 | xm4 | ym4

	fcoms	Lfp_near_clip
	fnstsw	%ax
	testb	$1,%ah
	jz		LNoClip
	fstp	%st(0)
	flds	Lfp_near_clip

LNoClip:

	fdivrs	float_1				// lzi0 | x | y
	fxch	%st(1)				// x | lzi0 | y

//	// FIXME: build x/yscale into transform?
//		scale = xscale * lzi0;
//		u0 = (xcenter + scale*transformed[0]);
	flds	C(xscale)			// xscale | x | lzi0 | y
	fmul	%st(2),%st(0)		// scale | x | lzi0 | y
	fmulp	%st(0),%st(1)		// scale*x | lzi0 | y
	fadds	C(xcenter)			// u0 | lzi0 | y

//		if (u0 < r_refdef.fvrectx_adj)
//			u0 = r_refdef.fvrectx_adj;
//		if (u0 > r_refdef.fvrectright_adj)
//			u0 = r_refdef.fvrectright_adj;
// FIXME: use integer compares of floats?
	fcoms	C(r_refdef)+rd_fvrectx_adj
	fnstsw	%ax
	testb	$1,%ah
	jz		LClampP0
	fstp	%st(0)
	flds	C(r_refdef)+rd_fvrectx_adj
LClampP0:
	fcoms	C(r_refdef)+rd_fvrectright_adj
	fnstsw	%ax
	testb	$0x45,%ah
	jnz		LClampP1
	fstp	%st(0)
	flds	C(r_refdef)+rd_fvrectright_adj
LClampP1:

	fld		%st(1)				// lzi0 | u0 | lzi0 | y

//		scale = yscale * lzi0;
//		v0 = (ycenter - scale*transformed[1]);
	fmuls	C(yscale)			// scale | u0 | lzi0 | y
	fmulp	%st(0),%st(3)		// u0 | lzi0 | scale*y
	fxch	%st(2)				// scale*y | lzi0 | u0
	fsubrs	C(ycenter)			// v0 | lzi0 | u0

//		if (v0 < r_refdef.fvrecty_adj)
//			v0 = r_refdef.fvrecty_adj;
//		if (v0 > r_refdef.fvrectbottom_adj)
//			v0 = r_refdef.fvrectbottom_adj;
// FIXME: use integer compares of floats?
	fcoms	C(r_refdef)+rd_fvrecty_adj
	fnstsw	%ax
	testb	$1,%ah
	jz		LClampP2
	fstp	%st(0)
	flds	C(r_refdef)+rd_fvrecty_adj
LClampP2:
	fcoms	C(r_refdef)+rd_fvrectbottom_adj
	fnstsw	%ax
	testb	$0x45,%ah
	jnz		LClampP3
	fstp	%st(0)
	flds	C(r_refdef)+rd_fvrectbottom_adj
LClampP3:
	ret

#endif	// id386
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