/* $XConsortium: miFillArea.c,v 5.10 94/04/17 20:37:05 hersh Exp $ */ /* Copyright (c) 1989, 1990, 1991 X Consortium Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the X Consortium shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the X Consortium. Copyright 1989, 1990, 1991 by Sun Microsystems, Inc. All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Sun Microsystems, not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. SUN MICROSYSTEMS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SUN MICROSYSTEMS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "miLUT.h" #include "misc.h" #include "miscstruct.h" #include "ddpex3.h" #include "PEXErr.h" #include "miStruct.h" #include "PEXprotost.h" #include "miRender.h" #include "extnsionst.h" #include "gcstruct.h" #include "ddpex2.h" #include "miLight.h" #include "miClip.h" #include static ddpex3rtn Complete_FillArea_Facetlist(); static ddpex3rtn Calculate_FillArea_Facet_Normal(); static ddpex3rtn Calculate_FillArea_Vertex_Color_and_Normal(); /*++ | | Function Name: miFillArea | | Function Description: | Handles the Fill area 3D, Fill area 2D, Fill area 3D with data, | Fill are set 2D, Fill are set 3D, Fill are set 3D with data ocs. | | Note(s): | --*/ ddpex3rtn miFillArea(pRend, pExecuteOC) /* in */ ddRendererPtr pRend; /* renderer handle */ miGenericStr *pExecuteOC; /* out */ { /* calls */ ddpex3rtn miTransform(); ddpex3rtn miConvertVertexColors(); ddpex3rtn miConvertFacetColors(); ddpex3rtn miLightFillArea(); ddpex3rtn miClipFillArea(); ddpex3rtn miCullFillArea(); ddpex3rtn miRenderFillArea(); /* Local variable definitions */ miFillAreaStruct *ddFill = (miFillAreaStruct *)(pExecuteOC+1); miListHeader *input_list = &ddFill->points; /* Input points */ ddBitmaskShort shape = ddFill->shape; /* shape hint */ ddUCHAR noEdges = ddFill->ignoreEdges; /* edge flag*/ listofddFacet *input_facet = ddFill->pFacets; /* facets */ miDDContext *pddc = (miDDContext *)(pRend->pDDContext); miListHeader *color_list, *mc_list, *mc_clist, *wc_list, *light_list, *cc_list, *clip_list, *dcue_list, *cull_list, *dc_list; listofddFacet *color_facet, *mc_facet, *wc_facet, *light_facet, *cc_facet, *clip_facet, *cull_facet, *dc_facet; listofddPoint *sp; int i, j; ddUSHORT clip_mode; ddpex3rtn status; ddPointType out_type; /* * Convert per-vertex and per-facet colors to rendering color model. * Note that this implementation only supports rgb float. */ if (DD_IsVertColour(input_list->type)) { if (status = miConvertVertexColors(pRend, input_list, PEXRdrColourModelRGB, &color_list)) return (status); } else { color_list = input_list; } if ((input_facet) && (DD_IsFacetColour(input_facet->type))) { if (status = miConvertFacetColors(pRend, input_facet, PEXRdrColourModelRGB, &color_facet)) return (status); } else { color_facet = input_facet; } /* Check for Model clipping */ if (pddc->Dynamic->pPCAttr->modelClip == PEXClip) { /* Compute modelling coord version of clipping volume */ ComputeMCVolume(pRend, pddc); clip_mode = MI_MCLIP; /* Tranform points to 4D for clipping */ out_type = color_list->type; if (status = miTransform(pddc, color_list, &mc_clist, ident4x4, ident4x4, DD_SetVert4D(out_type))) return (status); if (status = miClipFillArea(pddc, mc_clist, color_facet, &mc_list, &mc_facet, clip_mode)) return (status); /* if nothing left after modeling clip, return early */ if (mc_list->numLists <= 0) return(Success); } else { mc_list = color_list; mc_facet = color_facet; } clip_mode = MI_VCLIP; /* * First, check lighting requirements */ if (pddc->Static.attrs->reflModel != PEXReflectionNoShading) { /* Transform to WC prior to applying lighting */ out_type = mc_list->type; if (DD_IsVertNormal(out_type)) VALIDATEINVTRMCTOWCXFRM(pddc); if (status = miTransform(pddc, mc_list, &wc_list, pddc->Dynamic->mc_to_wc_xform, pddc->Static.misc.inv_tr_mc_to_wc_xform, DD_SetVert4D(out_type))) return (status); /* Transform facet normals if necessary */ if ((mc_facet) && (mc_facet->numFacets > 0) && (DD_IsFacetNormal(mc_facet->type))) { VALIDATEINVTRMCTOWCXFRM(pddc); if (status = miFacetTransform(pddc, mc_facet, &wc_facet, pddc->Static.misc.inv_tr_mc_to_wc_xform)) return (status); } else wc_facet = mc_facet; /* Apply lighting */ if (status = miLightFillArea(pRend, pddc, wc_list, wc_facet, &light_list, &light_facet)) return (status); /* Transform to CC for clipping */ if (DD_IsVertNormal(light_list->type)) VALIDATEINVTRWCTOCCXFRM(pddc); if (status = miTransform(pddc, light_list, &cc_list, pddc->Dynamic->wc_to_cc_xform, pddc->Static.misc.inv_tr_wc_to_cc_xform, light_list->type)) return (status); /* Transform facet normals if necessary */ if ( (light_facet) && (light_facet->numFacets > 0) && (DD_IsFacetNormal(light_facet->type)) ) { VALIDATEINVTRWCTOCCXFRM(pddc); if (status = miFacetTransform(pddc, light_facet, &cc_facet, pddc->Static.misc.inv_tr_wc_to_cc_xform)) return (status); } else cc_facet = light_facet; } else { out_type = mc_list->type; if (DD_IsVertNormal(out_type)) VALIDATEINVTRMCTOCCXFRM(pddc); if (status = miTransform(pddc, mc_list, &cc_list, pddc->Dynamic->mc_to_cc_xform, pddc->Static.misc.inv_tr_mc_to_cc_xform, DD_SetVert4D(out_type))) return (status); if ((mc_facet) && (mc_facet->numFacets > 0) && (DD_IsFacetNormal(mc_facet->type))) { VALIDATEINVTRMCTOCCXFRM(pddc); if (status = miFacetTransform(pddc, mc_facet, &cc_facet, pddc->Static.misc.inv_tr_mc_to_cc_xform)) return (status); } else cc_facet = mc_facet; } /* View clip primitive */ if (status = miClipFillArea(pddc, cc_list, cc_facet, &clip_list, &clip_facet, clip_mode)) return (status); /* if nothing left after view clip, return early */ if (clip_list->numLists <= 0) return(Success); /* Now cull according to current culling mode */ if (pddc->Dynamic->pPCAttr->cullMode) { if (status = miCullFillArea(pddc, clip_list, clip_facet, &cull_list, &cull_facet)) return (status); /* if nothing left after culling, return early */ if (cull_list->numLists <= 0) return(Success); clip_list = cull_list; clip_facet = cull_facet; } else { cull_list = clip_list; cull_facet = clip_facet; } /* DEPTH CUEING */ if (pddc->Dynamic->pPCAttr->depthCueIndex) { miDepthCueFillArea(pRend, cull_list, cull_facet, &dcue_list); cull_list = dcue_list; } /* Lastly, transform to DC coordinates */ out_type = cull_list->type; DD_SetVert2D(out_type); DD_SetVertShort(out_type); if (DD_IsVertNormal(out_type)) VALIDATEINVTRCCTODCXFRM(pddc); if (status = miTransform(pddc, cull_list, &dc_list, pddc->Dynamic->cc_to_dc_xform, pddc->Static.misc.inv_tr_cc_to_dc_xform, out_type) ) return (status); /* Transform facet normals if necessary */ if ( (clip_facet) && (clip_facet->numFacets > 0) && (DD_IsFacetNormal(clip_facet->type)) ) { VALIDATEINVTRCCTODCXFRM(pddc); if (status = miFacetTransform(pddc, clip_facet, &dc_facet, pddc->Static.misc.inv_tr_cc_to_dc_xform)) return (status); } else dc_facet = clip_facet; return (pddc->Static.RenderProcs[FILLAREA_RENDER_TABLE_INDEX](pRend, pddc, dc_list, dc_facet, shape, noEdges)); } /*++ | | Function Name: miClipFillArea | | Function Description: | Handles the fill area 3D, fill area 2D, | and fill area set 3D with data ocs. | | Note(s): | | This routine uses a Sutherland-Hodgman approach for | polygon clipping. (See, for example, Rodger's "Procedural | Elements for Computer Graphics", pp 169-179)). | Each list is clipped successively against each (enabled) | clipping boundary. | --*/ ddpex3rtn miClipFillArea(pddc, input_vert, input_fct, output_vert, output_fct, clip_mode) /* in */ miDDContext *pddc; miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ miListHeader **output_vert; /* output vertex data */ listofddFacet **output_fct; /* output facet data */ ddUSHORT clip_mode; /* view or model clipping */ { /* calls */ ddpex3rtn miCloseFillArea(); /* uses */ ddPointUnion in_ptP, in_ptQ; ddPointUnion out_pt; float t_ptP, t_ptQ; char *in_fct, *out_fct; int point_size; int facet_size; int num_points; int extra_point; int vert_count; miListHeader *input, *output, *list1, *list2; listofddPoint *pddilist; listofddPoint *pddolist; listofddFacet *finput, *foutput, *fct_list1, *fct_list2; int num_lists; int i, j, k, num_planes; ddUSHORT clipflags; ddUSHORT current_clip; int edge_offset, clip_code, pts_inlist; ddULONG *edge_ptr; ddHalfSpace *MC_HSpace; ddpex3rtn status; char do_edges, outside; /* flag to indicate current */ /* point of interest is outside */ /* Vertex data must be homogeneous for view clipping */ if ((clip_mode == MI_VCLIP) && !(DD_IsVert4D(input_vert->type))) return(1); /* Insure that the polygon bounds form closed contours */ if (status = miCloseFillArea(input_vert)) return(status); /* PHIGS specifies a single facet for a set of fill areas */ *output_fct = input_fct; /* * Use the pre-defined clip lists for output * Note that two buffers are used in "ping-pong" fashion: * first the first buffer is used for output, then the second. */ list1 = MI_NEXTTEMPDATALIST(pddc); MI_ALLOCLISTHEADER(list1, MI_ROUND_LISTHEADERCOUNT(input_vert->numLists)); if (!list1->ddList) return(BadAlloc); list2 = MI_NEXTTEMPDATALIST(pddc); MI_ALLOCLISTHEADER(list2, MI_ROUND_LISTHEADERCOUNT(input_vert->numLists)); if (!list2->ddList) return(BadAlloc); /* * Must have edge flags in vertex if edges are to be drawn - * otherwise, cannot determine wich edges are "original" and * which edges where added by the clipper. */ if (pddc->Static.attrs->edges != PEXOff) { do_edges = PEXOn; if (!(DD_IsVertEdge(input_vert->type))) { if (status = miAddEdgeFlag(pddc, input_vert, &list1)) return(status); input = list1; } else input = input_vert; } else { do_edges = PEXOff; /* Allocate an initial number of headers */ input = input_vert; } /* Note that adding edges will change the input type */ list1->type = input->type; list2->type = input->type; list1->flags = input->flags; list2->flags = input->flags; output = list2; /* Get point size so that this works for all point types */ DD_VertPointSize(input->type, point_size); DD_VertOffsetEdge(input->type, edge_offset); /* * Each list is now clipped in turn against each (enabled) boundary. */ if (clip_mode == MI_MCLIP) { num_planes = pddc->Static.misc.ms_MCV->numObj; MC_HSpace = (ddHalfSpace *)(pddc->Static.misc.ms_MCV->pList); } else num_planes = 6; /* view clipping to a cube */ for (i = 0; i < num_planes; i++) { current_clip = 1 << i; /* current_clip is new clip bound */ num_lists = 0; /* Restart list counter each pass */ for (j = 0, pddilist = input->ddList, pddolist = output->ddList, output->numLists = 0; j < input->numLists; j++) { /* Don't process if no points */ if ((vert_count = pddilist->numPoints) <= 0) { pddilist++; continue; } /* * Insure sufficient room for each vertex. * Note that twice the vertex count is an upper-bound for * a clipped polygon (although there is probably a "tighter fit"). */ MI_ALLOCLISTOFDDPOINT(pddolist, 2*vert_count, point_size); if (!(out_pt.ptr = (char *)pddolist->pts.ptr)) return(BadAlloc); pts_inlist = 0; clip_code = 0; /* Aquire two points */ /* and generate clip code */ in_ptP.ptr = pddilist->pts.ptr; COMPUTE_CLIP_PARAMS(in_ptP,t_ptP,0,clip_mode, current_clip,MC_HSpace,clip_code); if(!(clip_code)) { COPY_POINT(in_ptP, out_pt, point_size); ++pts_inlist; out_pt.ptr += point_size; } in_ptQ.ptr = in_ptP.ptr + point_size; for (k = 1; k < pddilist->numPoints; k++){ COMPUTE_CLIP_PARAMS(in_ptQ, t_ptQ, 1, clip_mode, current_clip,MC_HSpace,clip_code); switch(clip_code) { case 0: /* both P and Q are in bounds */ COPY_POINT(in_ptQ, out_pt, point_size); out_pt.ptr += point_size; ++pts_inlist; outside = PEXOff; break; case 1: /* P is out, Q is in */ CLIP_AND_COPY(input->type, in_ptP, t_ptP, in_ptQ, t_ptQ, out_pt); out_pt.ptr += point_size; COPY_POINT(in_ptQ, out_pt, point_size); out_pt.ptr += point_size; pts_inlist += 2; outside = PEXOff; break; case 2: /* P is in, Q is out */ CLIP_AND_COPY(input->type, in_ptQ, t_ptQ, in_ptP, t_ptP, out_pt); if (do_edges == PEXOn) { edge_ptr = (ddULONG *)(out_pt.ptr + edge_offset); *edge_ptr = 0; } out_pt.ptr += point_size; ++pts_inlist; outside = PEXOn; break; case 3: /* both are out */ outside = PEXOn; break; } in_ptP.ptr = in_ptQ.ptr; t_ptP = t_ptQ; in_ptQ.ptr += point_size; clip_code >>= 1; } if (pts_inlist > 1) { if (outside == PEXOn) { /* special case where last segment clipped out. Need to close the fill area */ COPY_POINT(pddolist->pts, out_pt, point_size); pts_inlist++; } pddolist->numPoints = pts_inlist; pddolist++; num_lists++; } /* Now, skip to next input list */ pddilist++; } /* Complete initialization of output list header */ output->numLists = num_lists; /* Use result of previous clip for input to next clip */ input = output; if (output == list2) output = list1; else output = list2; if (clip_mode == MI_MCLIP) MC_HSpace++; } /* end of processing for all planes */ /* Current input list is last processed (clipped) list */ *output_vert = input; return (Success); } /*++ | | miLightFillArea(pRend, pddc, input_vert, input_fct, output_vert, output_fct) | | Perform lighting calculations for the vertex or facet | data provided according to the current attributes. | --*/ ddpex3rtn miLightFillArea(pRend, pddc, input_vert, input_fct, output_vert, output_fct) ddRendererPtr pRend; /* renderer handle */ miDDContext *pddc; /* dd Context pointer */ miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ miListHeader **output_vert; /* output vertex data */ listofddFacet **output_fct; /* output facet data */ { /* calls */ ddpex3rtn miApply_Lighting(); ddpex3rtn miFilterPath(); /* uses */ listofddFacet *fct_list; miListHeader *out_vert; ddRgbFloatNormal *in_fct; ddRgbFloatColour *out_fct; listofddPoint *pddilist; listofddPoint *pddolist; ddRgbFloatNormalPoint4D *in_pt; ddRgbFloatPoint4D *out_pt; int i, j; ddpex3rtn status; /* * First, Insure that the vertex and/or facet data * is sufficient for the current Surface Interpolation method. * Note that this implementation does not support * PEXSurfaceInterpDotProduct and PEXSurfaceInterpNormal and * that these surface interpolation types are approximated by * PEXSurfaceInterpColour. The cases dealt with here, therefore, * are constant surface color (thus a single color is computed * per facet) and interpolated surface color (thus a color * per verted is required). */ switch(pddc->Static.attrs->surfInterp) { case PEXSurfaceInterpNone: /* * Insure that input facet data is in proper format * for flat shading. */ if ((!input_fct) || (input_fct->numFacets == 0) || (!( (DD_IsFacetColour(input_fct->type)) && (DD_IsFacetNormal(input_fct->type))))) { Complete_FillArea_Facetlist(pddc, input_vert, input_fct, output_fct); input_fct = *output_fct; } /* * Should have facets with normals and surface colors now. * Since we are flat shading, there is no further use * for per-vertex color or normal data (however, leave * any edge information). Remove it to prevent confusion * further down the pipeline. */ if ( (DD_IsVertNormal(input_vert->type)) || (DD_IsVertNormal(input_vert->type)) ) { if (status = miFilterPath(pddc, input_vert, output_vert, ((1 << 3) | 1) )) return(status); } else { *output_vert = input_vert; } /* * allocate storage for the facet list * Note that the output facet list only contains colors. */ *output_fct = fct_list = MI_NEXTTEMPFACETLIST(pddc); fct_list->numFacets = input_fct->numFacets; fct_list->type = DD_FACET_RGBFLOAT; MI_ALLOCLISTOFDDFACET(fct_list, input_fct->numFacets, sizeof(ddRgbFloatColour)); if (!(out_fct = fct_list->facets.pFacetRgbFloat)) return(BadAlloc); in_fct = input_fct->facets.pFacetRgbFloatN; pddilist = input_vert->ddList; /* * Compute lighted facet color for each facet. * Facet color is simply the sum of the lighting contributions * from each light source. */ for (i= 0; i < input_fct->numFacets; i++) { if (status = miApply_Lighting(pRend, pddc, pddilist->pts.p4Dpt, &(in_fct->colour), &(in_fct->normal), out_fct )) return(status); in_fct++; out_fct++; pddilist++; } break; case PEXSurfaceInterpColour: case PEXSurfaceInterpDotProduct: case PEXSurfaceInterpNormal: if ( (!DD_IsVertColour(input_vert->type)) || (!DD_IsVertNormal(input_vert->type)) ) { Calculate_FillArea_Vertex_Color_and_Normal(pddc, input_vert, input_fct, output_vert); input_vert = *output_vert; } /* No further need for per facet data */ *output_fct = 0; /* Perform shading on a per-vertex basis */ if (pddc->Static.attrs->reflModel != PEXReflectionNoShading) { /* Use one of the pre-defined 4D list for output */ *output_vert = out_vert = MI_NEXTTEMPDATALIST(pddc); /* Insure sufficient room for each header */ MI_ALLOCLISTHEADER(out_vert, input_vert->numLists) if (!out_vert->ddList) return(BadAlloc); out_vert->type = DD_RGBFLOAT_POINT4D; out_vert->numLists = input_vert->numLists; out_vert->flags = input_vert->flags; pddilist = input_vert->ddList; pddolist = out_vert->ddList; for (i = 0; i < input_vert->numLists; i++) { pddolist->numPoints = pddilist->numPoints; MI_ALLOCLISTOFDDPOINT(pddolist,(pddilist->numPoints+1), sizeof(ddRgbFloatPoint4D)); if (!(out_pt = pddolist->pts.pRgbFloatpt4D)) return(BadAlloc); in_pt = pddilist->pts.pRgbFloatNpt4D; for (j = 0; j < pddilist->numPoints; j++) { out_pt->pt = in_pt->pt; if (status = miApply_Lighting(pRend, pddc, &(in_pt->pt), &(in_pt->colour), &(in_pt->normal), &(out_pt->colour))) return(status); in_pt++; out_pt++; } pddilist++; pddolist++; } } break; default: *output_vert = input_vert; *output_fct = input_fct; } return(Success); } /*++ | | miCullFillArea(pddc, input_vert, input_fct, output_vert, output_fct) | | Perform lighting calculations for the vertex or facet | data provided according to the current attributes. | --*/ ddpex3rtn miCullFillArea(pddc, input_vert, input_fct, output_vert, output_fct) miDDContext *pddc; /* dd Context pointer */ miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ miListHeader **output_vert; /* output vertex data */ listofddFacet **output_fct; /* output facet data */ { /* uses */ miListHeader *out_vert; listofddPoint *pddilist; listofddPoint *pddolist; listofddFacet *fct_list; ddFacetUnion in_fct; ddFacetUnion out_fct; listofddPoint temp; int i, j; char accept; char return_facet_list; int numLists=0; int point_size, facet_size; /* * Create facet normals if necessary. These are used to determine * if the facet is to be culled. Note: only return a facet list * if a valid facet list is input. */ if ( (!input_fct) || (input_fct->numFacets <= 0) ) { Calculate_FillArea_Facet_Normal(pddc, input_vert, (listofddFacet *)0, &input_fct); return_facet_list = 0; *output_fct = 0; } else { if (!(DD_IsFacetNormal(input_fct->type))) { Calculate_FillArea_Facet_Normal(pddc, input_vert, input_fct, output_fct); input_fct = *output_fct; } return_facet_list = 1; } /* * allocate storage for the output vertex and facet list */ *output_vert = out_vert = MI_NEXTTEMPDATALIST(pddc); out_vert->type = input_vert->type; out_vert->flags = input_vert->flags; MI_ALLOCLISTHEADER(out_vert, input_vert->numLists) if (!out_vert->ddList) return(BadAlloc); pddilist = input_vert->ddList; pddolist = out_vert->ddList; DD_VertPointSize(input_vert->type, point_size); fct_list = MI_NEXTTEMPFACETLIST(pddc); fct_list->type = input_fct->type; DDFacetSIZE(input_fct->type, facet_size); MI_ALLOCLISTOFDDFACET(fct_list, input_fct->numFacets, facet_size); out_fct = fct_list->facets; if (!out_fct.pNoFacet) return(BadAlloc); in_fct = input_fct->facets; /* * This test is performed in NPC space. As a result, * the sign of the z component of the facet normal * indicates the direction in which the facet is pointing. * Therefore if the cullmode is PEXBackFaces and the * z component is negative, reject the facet. Similarily, * if the z component of the normal is positive, and * the cullmode is PEXFrontFaces, also reject the face. * Lastly, note that it is not necessary to copy the vertex * data - it is sufficient to copy the listofddPoint header. * To avoid alloc problems, however, the headers * are interchanged. (As opposed to over-writing the destination * header) */ for (i= 0; i < input_fct->numFacets; i++) { accept = 0; if (pddc->Dynamic->pPCAttr->cullMode == PEXBackFaces) { if (DD_IsFacetColour(input_fct->type)) { if (in_fct.pFacetRgbFloatN->normal.z >= 0) accept = 1; } else if (in_fct.pFacetN->z >= 0) accept = 1; } else /* pddc->Dynamic->pPCAttr->cullMode == PEXFrontFaces */ { if (DD_IsFacetColour(input_fct->type)) { if (in_fct.pFacetRgbFloatN->normal.z < 0) accept = 1; } else if (in_fct.pFacetN->z < 0) accept = 1; } if (accept) { /* First, swap the listofddPoint headers */ temp = *pddilist; *pddilist = *pddolist; *(pddolist++) = temp; /* Now, copy the facet info */ if (DD_IsFacetColour(input_fct->type)) *(out_fct.pFacetRgbFloatN++) = *in_fct.pFacetRgbFloatN; else *(out_fct.pFacetN++) = *in_fct.pFacetN; numLists++; } pddilist++; if (DD_IsFacetColour(input_fct->type)) in_fct.pFacetRgbFloatN++; else in_fct.pFacetN++; } out_vert->numLists = numLists; fct_list->numFacets = numLists; /* * Only return facet list if one was passed in. Reduces the * information that must be processed by the rest of the pipeline. */ if (return_facet_list) *output_fct = fct_list; return(Success); } /*++ | | Function Name: miCloseFillArea | | Function Description: | Close each bound in a list of vertex lists. "Closing" | a bound means insuring that the last point in the | bound is the same as the first point. This routine is | used, for example, to close each bound in a polygon | prior to "hollow" style rendering. | | Note(s): | Note this routine does its work in place - the input | list of vertices is (potentially) modified. | --*/ ddpex3rtn miCloseFillArea(vinput) /* in */ miListHeader *vinput; { /* uses */ char *first_pt, *last_pt; listofddPoint *pddlist; int vert_count; int point_size; int i, j; int close; pddlist = vinput->ddList; DD_VertPointSize(vinput->type, point_size); /* * Close each list. */ for (i = 0; i < vinput->numLists; i++) { if ((vert_count = pddlist->numPoints) <= 1) { pddlist++; continue; } close = 1; /* * Insure that the list forms a closed bound. * Note that comparison is point type dependant. */ first_pt = (char *)pddlist->pts.p4Dpt; last_pt = ((char *)pddlist->pts.p4Dpt) + (vert_count-1)*point_size; if (DD_IsVertFloat(vinput->type)) { if ((DD_IsVert2D(vinput->type)) && (((ddCoord4D *)first_pt)->x == ((ddCoord4D *)last_pt)->x) && (((ddCoord4D *)first_pt)->y == ((ddCoord4D *)last_pt)->y)) close = 0; else if ((DD_IsVert3D(vinput->type)) && (((ddCoord4D *)first_pt)->x == ((ddCoord4D *)last_pt)->x) && (((ddCoord4D *)first_pt)->y == ((ddCoord4D *)last_pt)->y) && (((ddCoord4D *)first_pt)->z == ((ddCoord4D *)last_pt)->z)) close = 0; else if ((((ddCoord4D *)first_pt)->x == ((ddCoord4D *)last_pt)->x) && (((ddCoord4D *)first_pt)->y == ((ddCoord4D *)last_pt)->y) && (((ddCoord4D *)first_pt)->z == ((ddCoord4D *)last_pt)->z) && (((ddCoord4D *)first_pt)->w == ((ddCoord4D *)last_pt)->w)) close = 0; } else { if ((DD_IsVert2D(vinput->type)) && (((ddCoord3DS *)first_pt)->x == ((ddCoord3DS *)last_pt)->x) && (((ddCoord3DS *)first_pt)->y == ((ddCoord3DS *)last_pt)->y)) close = 0; else if ((((ddCoord3DS *)first_pt)->x == ((ddCoord3DS *)last_pt)->x) && (((ddCoord3DS *)first_pt)->y == ((ddCoord3DS *)last_pt)->y) && (((ddCoord3DS *)first_pt)->z == ((ddCoord3DS *)last_pt)->z)) close = 0; } /* * if close is set then need to close the bound. * Copy the first point to one poast the last point * in the bound. */ if (close) { /* Insure sufficient room for each vertex */ MI_ALLOCLISTOFDDPOINT(pddlist, vert_count+1, point_size); if (!pddlist->pts.p2DSpt) return(BadAlloc); /* Insure realloc didn't move array */ first_pt = (char *)pddlist->pts.p4Dpt; last_pt = ((char *)pddlist->pts.p4Dpt) + (vert_count * point_size); /* copy first point to end of list */ /* JSH - assuming copy may overlap */ memmove( last_pt, first_pt, point_size); /* Increment point count */ pddlist->numPoints += 1; } /* Now, ski to next input list */ pddlist++; } return (Success); } /*++ | | Complete_FillArea_Facetlist(pddc, input_vert, input_fct, output_fct) | | Create an output facet list with facet color and normal using | proper precedence rules. | --*/ static ddpex3rtn Complete_FillArea_Facetlist(pddc, input_vert, input_fct, output_fct) miDDContext *pddc; miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ listofddFacet **output_fct; /* output facet data */ { listofddFacet *fct_list; ddRgbFloatNormal *out_fct; listofddPoint *pddlist; char *in_pt; ddFacetUnion in_fct; int point_size, color_offset, normal_offset; int numPoints; ddCoord3D *vert1, *vert2, *vert3; int i,j; int point_count; float length; char have_colors, have_normals, done; have_colors = have_normals = 0; /* What data must be added to output facet list ? */ if ((input_fct) && (input_fct->type != DD_FACET_NONE)) { in_fct.pNoFacet = input_fct->facets.pNoFacet; if DD_IsFacetNormal(input_fct->type) have_normals = ~0; if DD_IsFacetColour(input_fct->type) have_colors = ~0; } if ((have_colors) && (have_normals)) { /* Why are we here? */ *output_fct = input_fct; return(Success); } /* * Allocate storage for the facet list */ fct_list = MI_NEXTTEMPFACETLIST(pddc); MI_ALLOCLISTOFDDFACET(fct_list, 1, sizeof(ddRgbFloatNormal)); if (!fct_list->facets.pFacetRgbFloatN) return(BadAlloc); out_fct = (ddRgbFloatNormal *)fct_list->facets.pFacetRgbFloatN; DD_VertPointSize(input_vert->type, point_size); /* * Compute "intrinsic" color of facet. * There is a "hierarchy" of sources for a facet's intrinsic * color: * vertex_color present? facet_color = vertex_color * else facet_color present? facet_color = facet_color * else facet_color = PC_surface_color * Obviously there is no pre-defined facet color in this routine, * so either use vertex color or surface color from PC. */ if (DD_IsVertColour(input_vert->type)) { /* Compute average facet color */ point_count = 0; pddlist = input_vert->ddList; out_fct->colour.red=out_fct->colour.green=out_fct->colour.blue=0.0; for (i = 0; i < input_vert->numLists; i++, pddlist++) { in_pt = pddlist->pts.ptr; for (j = 0; j < input_vert->numLists; j++, in_pt += point_size, point_count++) { out_fct->colour.red += ((ddRgbFloatPoint4D *)in_pt)->colour.red; out_fct->colour.green += ((ddRgbFloatPoint4D *)in_pt)->colour.green; out_fct->colour.blue += ((ddRgbFloatPoint4D *)in_pt)->colour.blue; } } out_fct->colour.red /= point_count; out_fct->colour.green /= point_count; out_fct->colour.blue /= point_count; } else if (have_colors) { out_fct->colour = *in_fct.pFacetRgbFloat; } else { /* use front face colors. This needs to get generalized to deal with back-facing attributes*/ out_fct->colour = pddc->Static.attrs->surfaceColour.colour.rgbFloat; } if (!(have_normals)) { done = PEXOff; pddlist = input_vert->ddList; for (j = 0; ((j < input_vert->numLists) && !(done)); j++) { /* Don't process if insufficient number of points */ if ((numPoints = pddlist->numPoints) > 2) { in_pt = pddlist->pts.ptr; /* * Compute surface normal. * The Surface normal is the cross product of the first * three non-colinear points. */ vert1 = ((ddCoord3D *)in_pt); in_pt += point_size; vert2 = ((ddCoord3D *)in_pt); in_pt += point_size; vert3 = ((ddCoord3D *)in_pt); in_pt += point_size; numPoints -= 3; CROSS_PRODUCT(vert1, vert2, vert3, &(out_fct->normal)); NORMALIZE_VECTOR(&(out_fct->normal), length); while (NEAR_ZERO(length) && (numPoints > 0)) { vert1 = vert2; vert2 = vert3; vert3 = ((ddCoord3D *)in_pt); in_pt += point_size; CROSS_PRODUCT(vert1, vert2, vert3, &(out_fct->normal)); NORMALIZE_VECTOR(&(out_fct->normal), length); numPoints--; } if (!(NEAR_ZERO(length))) done = PEXOn; /* :-) */ } pddlist++; } } else { /* use input facet normals */ out_fct->normal = *in_fct.pFacetN; } fct_list->type = DD_FACET_RGBFLOAT_NORM; fct_list->numFacets = 1; *output_fct = fct_list; return(Success); } /*++ | | Calculate_FillArea_Facet_Normal | | Add facet normals to a facet list. | --*/ static ddpex3rtn Calculate_FillArea_Facet_Normal(pddc, input_vert, input_fct, output_fct) miDDContext *pddc; miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ listofddFacet **output_fct; /* output facet data */ { listofddFacet *fct_list; ddRgbFloatColour *in_fct; ddFacetUnion out_fct; listofddPoint *pddlist; char *in_pt; ddVector3D normal; int point_size; int numPoints; ddCoord3D *vert1, *vert2, *vert3; int numfacets; int i, j; float length; char done; /* Some quick error checking */ if ((input_fct) && (DD_IsFacetNormal(input_fct->type))) return(Success); /* * Allocate storage for the output facet list */ fct_list = MI_NEXTTEMPFACETLIST(pddc); if ((input_fct) && DD_IsFacetColour(input_fct->type)) { in_fct = input_fct->facets.pFacetRgbFloat; fct_list->type = DD_FACET_RGBFLOAT_NORM; numfacets = 1; MI_ALLOCLISTOFDDFACET(fct_list, 1, sizeof(ddRgbFloatNormal)); } else { in_fct = 0; fct_list->type = DD_FACET_NORM; numfacets = 1; MI_ALLOCLISTOFDDFACET(fct_list, 1, sizeof(ddVector3D)); } fct_list->numFacets = numfacets; if (!fct_list->facets.pNoFacet) return(BadAlloc); out_fct = fct_list->facets; DD_VertPointSize(input_vert->type, point_size); pddlist = input_vert->ddList; /* Copy the input facet color */ if (in_fct) { *out_fct.pFacetRgbFloat = *in_fct; in_fct++; } done = PEXOff; for(i = 0; ((i < input_vert->numLists) && (!(done))); i++) { if ((numPoints = pddlist->numPoints) > 2) { in_pt = pddlist->pts.ptr; /* * Compute surface normal. * The Surface normal is the cross product of the first * three non-colinear points. */ numPoints -= 3; vert1 = ((ddCoord3D *)in_pt); in_pt += point_size; vert2 = ((ddCoord3D *)in_pt); in_pt += point_size; vert3 = ((ddCoord3D *)in_pt); in_pt += point_size; CROSS_PRODUCT(vert1, vert2, vert3, &normal); NORMALIZE_VECTOR(&normal, length); while (NEAR_ZERO(length) && (--numPoints >= 0)) { vert1 = vert2; vert2 = vert3; vert3 = ((ddCoord3D *)in_pt); in_pt += point_size; CROSS_PRODUCT(vert1, vert2, vert3, &normal); NORMALIZE_VECTOR(&normal, length); } /* Initialize to some arbitrary value if degenerate */ if (!NEAR_ZERO(length)) { done = PEXOn; if (in_fct) (out_fct.pFacetRgbFloatN++)->normal = normal; else *(out_fct.pFacetN++) = normal; } } pddlist++; } *output_fct = fct_list; return(Success); } /*++ | | Calculate_FillArea_Vertex_Color_and_Normal | | Add vertex normals and colors to a vertex list. | --*/ static ddpex3rtn Calculate_FillArea_Vertex_Color_and_Normal(pddc, input_vert, input_fct, output_vert) miDDContext *pddc; miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ miListHeader **output_vert; /* output vertex data */ { miListHeader *out_vert; listofddFacet *fct_list; ddRgbFloatNormal *out_fct; listofddPoint *pddilist; listofddPoint *pddolist; ddRgbFloatNormalPoint4D *out_pt; ddPointUnion in_pt; ddFacetUnion in_fct; int point_size, facet_size; int numFacets=0; int numPoints; int i,j; char done; /* Some quick error checking */ if ((DD_IsVertNormal(input_vert->type)) && (DD_IsVertColour(input_vert->type))) return(Success); /* Use one of the pre-defined 4D list for output */ *output_vert = out_vert = MI_NEXTTEMPDATALIST(pddc); /* Insure sufficient room for each header */ MI_ALLOCLISTHEADER(out_vert, input_vert->numLists) if (!out_vert->ddList) return(BadAlloc); out_vert->type = DD_RGBFLOAT_NORM_POINT4D; out_vert->numLists = input_vert->numLists; out_vert->flags = input_vert->flags; pddilist = input_vert->ddList; pddolist = out_vert->ddList; DD_VertPointSize(input_vert->type, point_size); /* Compute facet normals if no per-vertex normals with data */ if (!(DD_IsVertNormal(input_vert->type))) { if (!(input_fct)) { if (i = Calculate_FillArea_Facet_Normal(pddc, input_vert, input_fct, &fct_list)) return(i); input_fct = fct_list; } else if (!(DD_IsFacetNormal(input_fct->type))) { if (i = Calculate_FillArea_Facet_Normal(pddc, input_vert, input_fct, &fct_list)) return(i); input_fct = fct_list; } } if ((input_fct) && (input_fct->numFacets > 0)) in_fct = input_fct->facets; else in_fct.pNoFacet = 0; DDFacetSIZE(input_fct->type, facet_size); done = PEXOff; for (i = 0; i < input_vert->numLists; i++) { pddolist->numPoints = pddilist->numPoints; MI_ALLOCLISTOFDDPOINT(pddolist,(pddilist->numPoints+1), sizeof(ddRgbFloatNormalPoint4D)); if (!(out_pt = pddolist->pts.pRgbFloatNpt4D)) return(BadAlloc); in_pt = pddilist->pts; for (j = 0; j < pddilist->numPoints; j++) { /* First copy over coordinate data */ out_pt->pt = *in_pt.p4Dpt; /* * Next color * Colour is derived first from the vertex, second from the * facet, and third from the current PC attributes. */ if (DD_IsVertColour(input_vert->type)) out_pt->colour = in_pt.pRgbFloatpt4D->colour; else if ((in_fct.pNoFacet) && (DD_IsFacetColour(input_fct->type))) out_pt->colour = *in_fct.pFacetRgbFloat; else out_pt->colour = pddc->Static.attrs->surfaceColour.colour.rgbFloat; /* * Next normals * Colour is derived first from the vertex, second from the * facet (note that we insured above that there were facet normals). */ if (DD_IsVertNormal(input_vert->type)) out_pt->normal = in_pt.pNpt4D->normal; else if (DD_IsFacetColour(input_fct->type)) out_pt->normal = in_fct.pFacetRgbFloatN->normal; else out_pt->normal = *in_fct.pFacetN; out_pt++; in_pt.ptr += point_size; } pddilist++; pddolist++; } return(Success); } /*++ | | DepthCueFillArea(pRend, input_vert, input_fct, output_vert) | | Applies depth cueing to the vertex colors in a FillArea data list | --*/ ddpex3rtn miDepthCueFillArea(pRend, input_vert, input_fct, output_vert) ddRendererPtr pRend; /* renderer handle */ miListHeader *input_vert; /* input vertex data */ listofddFacet *input_fct; /* input facet data */ miListHeader **output_vert; /* output vertex data */ { miDDContext *pddc = (miDDContext *)(pRend->pDDContext); miListHeader *out_vert; listofddFacet *fct_list; ddRgbFloatNormal *out_fct; listofddPoint *pddilist; listofddPoint *pddolist; ddPointUnion in_pt, out_pt; ddRgbFloatColour *in_color; ddFacetUnion in_fct; int point_size, facet_size; int numFacets=0; int numPoints; int i,j,outpoint_size; miColourEntry *pintcolour; ddFLOAT pt_depth; ddULONG colourindex; ddColourSpecifier intcolour; ddUSHORT status; ddDepthCueEntry *dcue_entry; /* look for empty list header */ if (input_vert->numLists == 0) return(Success); /* validate CC version of Depth Cue information */ if (pddc->Static.misc.flags & CC_DCUEVERSION) Compute_CC_Dcue(pRend, pddc); /* check to make sure depth cuing is enabled */ if (pddc->Static.misc.cc_dcue_entry.mode == PEXOff) { *output_vert = input_vert; return(Success); } /* Else, depth cue! Use one of the pre-defined 4D list for output */ *output_vert = out_vert = MI_NEXTTEMPDATALIST(pddc); /* Insure sufficient room for each header */ MI_ALLOCLISTHEADER(out_vert, input_vert->numLists) if (!out_vert->ddList) return(BadAlloc); out_vert->type = input_vert->type; DD_SetVertRGBFLOAT(out_vert->type); out_vert->numLists = input_vert->numLists; out_vert->flags = input_vert->flags; pddilist = input_vert->ddList; pddolist = out_vert->ddList; DD_VertPointSize(input_vert->type, point_size); if ((input_fct) && (input_fct->numFacets > 0)){ in_fct = input_fct->facets; DDFacetSIZE(input_fct->type, facet_size); } else in_fct.pNoFacet = 0; /* Get current surface color if appropriate */ if (!(DD_IsVertColour(input_vert->type)) && (pddc->Static.attrs->surfaceColour.colourType == PEXIndexedColour)) { if ((InquireLUTEntryAddress (PEXColourLUT, pRend->lut[PEXColourLUT], pddc->Static.attrs->surfaceColour.colour.indexed.index, &status, (ddPointer *)&pintcolour)) == PEXLookupTableError) return (PEXLookupTableError); } DD_VertPointSize(out_vert->type, outpoint_size); for (i = 0; i < input_vert->numLists; i++) { pddolist->numPoints = pddilist->numPoints; MI_ALLOCLISTOFDDPOINT(pddolist,(pddilist->numPoints+1), outpoint_size); if (!(out_pt.ptr = pddolist->pts.ptr)) return(BadAlloc); in_pt = pddilist->pts; for (j = 0; j < pddilist->numPoints; j++) { /* First copy over coordinate data */ pt_depth = in_pt.p4Dpt->z; *out_pt.p4Dpt = *in_pt.p4Dpt; in_pt.p4Dpt++; out_pt.p4Dpt++; /* * Next color * Colour is derived first from the vertex, second from the * facet, and third from the current PC attributes. */ if (DD_IsVertColour(input_vert->type)){ in_color = in_pt.pRgbFloatClr; in_pt.pRgbFloatClr++; } else { if ((in_fct.pNoFacet) && (DD_IsFacetColour(input_fct->type))) in_color = in_fct.pFacetRgbFloat; else { if (pddc->Static.attrs->surfaceColour.colourType == PEXIndexedColour) in_color = &pintcolour->entry.colour.rgbFloat; else in_color = &(pddc->Static.attrs->surfaceColour.colour.rgbFloat); } } APPLY_DEPTH_CUEING(pddc->Static.misc.cc_dcue_entry, pt_depth, in_color, out_pt.pRgbFloatClr) out_pt.pRgbFloatClr++; /* * Next normals * Colour is derived first from the vertex, second from the * facet (note that we insured above that there were facet normals). */ if DD_IsVertNormal(input_vert->type) { *out_pt.pNormal = *in_pt.pNormal; in_pt.pNormal++; out_pt.pNormal++; } /* Next pass along edge info if there is any */ if (DD_IsVertEdge(out_vert->type)) { *out_pt.pEdge = *in_pt.pEdge; in_pt.pEdge++; out_pt.pEdge++; } } pddilist++; pddolist++; } return(Success); }