ref: 02611e064eceed8d8cda8cc4d6e60f8f1833ea72
dir: /u/r_drawa.s/
// // r_drawa.s // x86 assembly-language edge clipping and emission code // #include "asm_i386.h" #include "quakeasm.h" #include "asm_draw.h" #include "d_ifacea.h" #ifdef id386 // !!! if these are changed, they must be changed in r_draw.c too !!! #define FULLY_CLIPPED_CACHED 0x80000000 #define FRAMECOUNT_MASK 0x7FFFFFFF .data Ld0: .single 0.0 Ld1: .single 0.0 Lstack: .long 0 Lfp_near_clip: .single NEAR_CLIP Lceilv0: .long 0 Lv: .long 0 Lu0: .long 0 Lv0: .long 0 Lzi0: .long 0 .text //---------------------------------------------------------------------- // edge clipping code //---------------------------------------------------------------------- #define pv0 4+12 #define pv1 8+12 #define clip 12+12 .align 4 .globl C(R_ClipEdge) C(R_ClipEdge): pushl %esi // preserve register variables pushl %edi pushl %ebx movl %esp,Lstack // for clearing the stack later // float d0, d1, f; // mvertex_t clipvert; movl clip(%esp),%ebx movl pv0(%esp),%esi movl pv1(%esp),%edx // if (clip) // { testl %ebx,%ebx jz Lemit // do // { Lcliploop: // d0 = DotProduct (pv0->position, clip->normal) - clip->dist; // d1 = DotProduct (pv1->position, clip->normal) - clip->dist; flds mv_position+0(%esi) fmuls cp_normal+0(%ebx) flds mv_position+4(%esi) fmuls cp_normal+4(%ebx) flds mv_position+8(%esi) fmuls cp_normal+8(%ebx) fxch %st(1) faddp %st(0),%st(2) // d0mul2 | d0add0 flds mv_position+0(%edx) fmuls cp_normal+0(%ebx) flds mv_position+4(%edx) fmuls cp_normal+4(%ebx) flds mv_position+8(%edx) fmuls cp_normal+8(%ebx) fxch %st(1) faddp %st(0),%st(2) // d1mul2 | d1add0 | d0mul2 | d0add0 fxch %st(3) // d0add0 | d1add0 | d0mul2 | d1mul2 faddp %st(0),%st(2) // d1add0 | dot0 | d1mul2 faddp %st(0),%st(2) // dot0 | dot1 fsubs cp_dist(%ebx) // d0 | dot1 fxch %st(1) // dot1 | d0 fsubs cp_dist(%ebx) // d1 | d0 fxch %st(1) fstps Ld0 fstps Ld1 // if (d0 >= 0) // { movl Ld0,%eax movl Ld1,%ecx orl %eax,%ecx js Lp2 // both points are unclipped Lcontinue: // // R_ClipEdge (&clipvert, pv1, clip->next); // return; // } // } while ((clip = clip->next) != NULL); movl cp_next(%ebx),%ebx testl %ebx,%ebx jnz Lcliploop // } //// add the edge // R_EmitEdge (pv0, pv1); Lemit: // // set integer rounding to ceil mode, set to single precision // // FIXME: do away with by manually extracting integers from floats? // FIXME: set less often fldcw ceil_cw // edge_t *edge, *pcheck; // int u_check; // float u, u_step; // vec3_t local, transformed; // float *world; // int v, v2, ceilv0; // float scale, lzi0, u0, v0; // int side; // if (r_lastvertvalid) // { cmpl $0,C(r_lastvertvalid) jz LCalcFirst // u0 = r_u1; // v0 = r_v1; // lzi0 = r_lzi1; // ceilv0 = r_ceilv1; movl C(r_lzi1),%eax movl C(r_u1),%ecx movl %eax,Lzi0 movl %ecx,Lu0 movl C(r_v1),%ecx movl C(r_ceilv1),%eax movl %ecx,Lv0 movl %eax,Lceilv0 jmp LCalcSecond // } LCalcFirst: // else // { // world = &pv0->position[0]; call LTransformAndProject // v0 | lzi0 | u0 fsts Lv0 fxch %st(2) // u0 | lzi0 | v0 fstps Lu0 // lzi0 | v0 fstps Lzi0 // v0 // ceilv0 = (int)(v0 - 2000) + 2000; // ceil(v0); fistpl Lceilv0 // } LCalcSecond: // world = &pv1->position[0]; movl %edx,%esi call LTransformAndProject // v1 | lzi1 | u1 flds Lu0 // u0 | v1 | lzi1 | u1 fxch %st(3) // u1 | v1 | lzi1 | u0 flds Lzi0 // lzi0 | u1 | v1 | lzi1 | u0 fxch %st(3) // lzi1 | u1 | v1 | lzi0 | u0 flds Lv0 // v0 | lzi1 | u1 | v1 | lzi0 | u0 fxch %st(3) // v1 | lzi1 | u1 | v0 | lzi0 | u0 // r_ceilv1 = (int)(r_v1 - 2000) + 2000; // ceil(r_v1); fistl C(r_ceilv1) fldcw single_cw // put back normal floating-point state fsts C(r_v1) fxch %st(4) // lzi0 | lzi1 | u1 | v0 | v1 | u0 // if (r_lzi1 > lzi0) // lzi0 = r_lzi1; fcom %st(1) fnstsw %ax testb $1,%ah jz LP0 fstp %st(0) fld %st(0) LP0: fxch %st(1) // lzi1 | lzi0 | u1 | v0 | v1 | u0 fstps C(r_lzi1) // lzi0 | u1 | v0 | v1 | u0 fxch %st(1) fsts C(r_u1) fxch %st(1) // if (lzi0 > r_nearzi) // for mipmap finding // r_nearzi = lzi0; fcoms C(r_nearzi) fnstsw %ax testb $0x45,%ah jnz LP1 fsts C(r_nearzi) LP1: // // for right edges, all we want is the effect on 1/z // if (r_nearzionly) // return; movl C(r_nearzionly),%eax testl %eax,%eax jz LP2 LPop5AndDone: movl C(cacheoffset),%eax movl C(r_framecount),%edx cmpl $0x7FFFFFFF,%eax jz LDoPop andl $(FRAMECOUNT_MASK),%edx orl $(FULLY_CLIPPED_CACHED),%edx movl %edx,C(cacheoffset) LDoPop: fstp %st(0) // u1 | v0 | v1 | u0 fstp %st(0) // v0 | v1 | u0 fstp %st(0) // v1 | u0 fstp %st(0) // u0 fstp %st(0) jmp Ldone LP2: // // create the edge // if (ceilv0 == r_ceilv1) // return; // horizontal edge movl Lceilv0,%ebx movl C(edge_p),%edi movl C(r_ceilv1),%ecx movl %edi,%edx movl C(r_pedge),%esi addl $(et_size),%edx cmpl %ecx,%ebx jz LPop5AndDone movl C(r_pedge),%eax movl %eax,et_owner(%edi) // side = ceilv0 > r_ceilv1; // // edge->nearzi = lzi0; fstps et_nearzi(%edi) // u1 | v0 | v1 | u0 // if (side == 1) // { jc LSide0 LSide1: // // leading edge (go from p2 to p1) // u_step = ((u0 - r_u1) / (v0 - r_v1)); fsubrp %st(0),%st(3) // v0 | v1 | u0-u1 fsub %st(1),%st(0) // v0-v1 | v1 | u0-u1 fdivrp %st(0),%st(2) // v1 | ustep // r_emitted = 1; movl $1,C(r_emitted) // edge = edge_p++; movl %edx,C(edge_p) // pretouch next edge movl (%edx),%eax // v2 = ceilv0 - 1; // v = r_ceilv1; movl %ecx,%eax leal -1(%ebx),%ecx movl %eax,%ebx // edge->surfs[0] = 0; // edge->surfs[1] = surface_p - surfaces; movl C(surface_p),%eax movl C(surfaces),%esi subl %edx,%edx subl %esi,%eax shrl $(SURF_T_SHIFT),%eax movl %edx,et_surfs(%edi) movl %eax,et_surfs+2(%edi) subl %esi,%esi // u = r_u1 + ((float)v - r_v1) * u_step; movl %ebx,Lv fildl Lv // v | v1 | ustep fsubp %st(0),%st(1) // v-v1 | ustep fmul %st(1),%st(0) // (v-v1)*ustep | ustep fadds C(r_u1) // u | ustep jmp LSideDone // } LSide0: // else // { // // trailing edge (go from p1 to p2) // u_step = ((r_u1 - u0) / (r_v1 - v0)); fsub %st(3),%st(0) // u1-u0 | v0 | v1 | u0 fxch %st(2) // v1 | v0 | u1-u0 | u0 fsub %st(1),%st(0) // v1-v0 | v0 | u1-u0 | u0 fdivrp %st(0),%st(2) // v0 | ustep | u0 // r_emitted = 1; movl $1,C(r_emitted) // edge = edge_p++; movl %edx,C(edge_p) // pretouch next edge movl (%edx),%eax // v = ceilv0; // v2 = r_ceilv1 - 1; decl %ecx // edge->surfs[0] = surface_p - surfaces; // edge->surfs[1] = 0; movl C(surface_p),%eax movl C(surfaces),%esi subl %edx,%edx subl %esi,%eax shrl $(SURF_T_SHIFT),%eax movl %edx,et_surfs+2(%edi) movl %eax,et_surfs(%edi) movl $1,%esi // u = u0 + ((float)v - v0) * u_step; movl %ebx,Lv fildl Lv // v | v0 | ustep | u0 fsubp %st(0),%st(1) // v-v0 | ustep | u0 fmul %st(1),%st(0) // (v-v0)*ustep | ustep | u0 faddp %st(0),%st(2) // ustep | u fxch %st(1) // u | ustep // } LSideDone: // edge->u_step = u_step*0x100000; // edge->u = u*0x100000 + 0xFFFFF; fmuls fp_1m // u*0x100000 | ustep fxch %st(1) // ustep | u*0x100000 fmuls fp_1m // ustep*0x100000 | u*0x100000 fxch %st(1) // u*0x100000 | ustep*0x100000 fadds fp_1m_minus_1 // u*0x100000 + 0xFFFFF | ustep*0x100000 fxch %st(1) // ustep*0x100000 | u*0x100000 + 0xFFFFF fistpl et_u_step(%edi) // u*0x100000 + 0xFFFFF fistpl et_u(%edi) // // we need to do this to avoid stepping off the edges if a very nearly // // horizontal edge is less than epsilon above a scan, and numeric error // // causes it to incorrectly extend to the scan, and the extension of the // // line goes off the edge of the screen // // FIXME: is this actually needed? // if (edge->u < r_refdef.vrect_x_adj_shift20) // edge->u = r_refdef.vrect_x_adj_shift20; // if (edge->u > r_refdef.vrectright_adj_shift20) // edge->u = r_refdef.vrectright_adj_shift20; movl et_u(%edi),%eax movl C(r_refdef)+rd_vrect_x_adj_shift20,%edx cmpl %edx,%eax jl LP4 movl C(r_refdef)+rd_vrectright_adj_shift20,%edx cmpl %edx,%eax jng LP5 LP4: movl %edx,et_u(%edi) movl %edx,%eax LP5: // // sort the edge in normally // u_check = edge->u; // // if (edge->surfs[0]) // u_check++; // sort trailers after leaders addl %esi,%eax // if (!newedges[v] || newedges[v]->u >= u_check) // { movl C(newedges)(,%ebx,4),%esi testl %esi,%esi 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