X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=tools%2Fropesim%2Fsrc%2Fmeshload.c;fp=tools%2Fropesim%2Fsrc%2Fmeshload.c;h=3a1fc7011f5b8d6963f0d5598c6160eebc97ee62;hp=0000000000000000000000000000000000000000;hb=be72aee3c4a0a5516bdccf06c5419efe3e026ee4;hpb=e8b26db00c934d141f16652cb8dcbeae23b17e48

diff --git a/tools/ropesim/src/meshload.c b/tools/ropesim/src/meshload.c
new file mode 100644
index 0000000..3a1fc70
--- /dev/null
+++ b/tools/ropesim/src/meshload.c
@@ -0,0 +1,398 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <assert.h>
+#include "cmesh.h"
+
+#ifdef USE_ASSIMP
+#include <assimp/cimport.h>
+#include <assimp/postprocess.h>
+#include <assimp/mesh.h>
+#include <assimp/scene.h>
+#include <assimp/types.h>
+#else
+#include "dynarr.h"
+#include "rbtree.h"
+#endif
+
+
+#ifdef USE_ASSIMP
+
+static int add_mesh(struct cmesh *mesh, struct aiMesh *aimesh);
+
+#define AIPPFLAGS \
+	(aiProcess_JoinIdenticalVertices | aiProcess_PreTransformVertices | \
+	 aiProcess_Triangulate | aiProcess_SortByPType | aiProcess_FlipUVs)
+
+int cmesh_load(struct cmesh *mesh, const char *fname)
+{
+	int i;
+	const struct aiScene *aiscn;
+
+	if(!(aiscn = aiImportFile(fname, AIPPFLAGS))) {
+		fprintf(stderr, "failed to open mesh file: %s\n", fname);
+		return -1;
+	}
+
+	for(i=0; i<(int)aiscn->mNumMeshes; i++) {
+		add_mesh(mesh, aiscn->mMeshes[i]);
+	}
+
+	aiReleaseImport(aiscn);
+	return 0;
+}
+
+static int add_mesh(struct cmesh *mesh, struct aiMesh *aim)
+{
+	int i, j, voffs, foffs;
+
+	voffs = cmesh_attrib_count(mesh, CMESH_ATTR_VERTEX);
+	foffs = cmesh_poly_count(mesh);
+
+	for(i=0; i<aim->mNumVertices; i++) {
+		struct aiVector3D *v = aim->mVertices + i;
+		cmesh_push_attrib3f(mesh, CMESH_ATTR_VERTEX, v->x, v->y, v->z);
+
+		if(aim->mNormals) {
+			v = aim->mNormals + i;
+			cmesh_push_attrib3f(mesh, CMESH_ATTR_NORMAL, v->x, v->y, v->z);
+		}
+		if(aim->mTangents) {
+			v = aim->mTangents + i;
+			cmesh_push_attrib3f(mesh, CMESH_ATTR_TANGENT, v->x, v->y, v->z);
+		}
+		if(aim->mColors[0]) {
+			struct aiColor4D *col = aim->mColors[0] + i;
+			cmesh_push_attrib4f(mesh, CMESH_ATTR_COLOR, col->r, col->g, col->b, col->a);
+		}
+		if(aim->mTextureCoords[0]) {
+			v = aim->mTextureCoords[0] + i;
+			cmesh_push_attrib2f(mesh, CMESH_ATTR_TEXCOORD, v->x, v->y);
+		}
+		if(aim->mTextureCoords[1]) {
+			v = aim->mTextureCoords[1] + i;
+			cmesh_push_attrib2f(mesh, CMESH_ATTR_TEXCOORD2, v->x, v->y);
+		}
+	}
+
+	if(aim->mFaces) {
+		for(i=0; i<aim->mNumFaces; i++) {
+			assert(aim->mFaces[i].mNumIndices == 3);
+			for(j=0; j<3; j++) {
+				cmesh_push_index(mesh, aim->mFaces[i].mIndices[j] + voffs);
+			}
+		}
+		cmesh_submesh(mesh, aim->mName.data, foffs, aim->mNumFaces);
+	}
+	return 0;
+}
+
+#else
+
+struct vertex_pos {
+	float x, y, z;
+};
+
+struct facevertex {
+	int vidx, tidx, nidx;
+};
+
+static char *clean_line(char *s);
+static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn);
+static int cmp_facevert(const void *ap, const void *bp);
+static void free_rbnode_key(struct rbnode *n, void *cls);
+
+/* merge of different indices per attribute happens during face processing.
+ *
+ * A triplet of (vertex index/texcoord index/normal index) is used as the key
+ * to search in a balanced binary search tree for vertex buffer index assigned
+ * to the same triplet if it has been encountered before. That index is
+ * appended to the index buffer.
+ *
+ * If a particular triplet has not been encountered before, a new vertex is
+ * appended to the vertex buffer. The index of this new vertex is appended to
+ * the index buffer, and also inserted into the tree for future searches.
+ */
+int cmesh_load(struct cmesh *mesh, const char *fname)
+{
+	int i, line_num = 0, result = -1;
+	int found_quad = 0;
+	FILE *fp = 0;
+	char buf[256];
+	struct vertex_pos *varr = 0;
+	cgm_vec3 *narr = 0;
+	cgm_vec2 *tarr = 0;
+	struct rbtree *rbtree = 0;
+	char *subname = 0;
+	int substart = 0, subcount = 0;
+
+	if(!(fp = fopen(fname, "rb"))) {
+		fprintf(stderr, "load_mesh: failed to open file: %s\n", fname);
+		goto err;
+	}
+
+	if(!(rbtree = rb_create(cmp_facevert))) {
+		fprintf(stderr, "load_mesh: failed to create facevertex binary search tree\n");
+		goto err;
+	}
+	rb_set_delete_func(rbtree, free_rbnode_key, 0);
+
+	if(!(varr = dynarr_alloc(0, sizeof *varr)) ||
+			!(narr = dynarr_alloc(0, sizeof *narr)) ||
+			!(tarr = dynarr_alloc(0, sizeof *tarr))) {
+		fprintf(stderr, "load_mesh: failed to allocate resizable vertex array\n");
+		goto err;
+	}
+
+	while(fgets(buf, sizeof buf, fp)) {
+		char *line = clean_line(buf);
+		++line_num;
+
+		if(!*line) continue;
+
+		switch(line[0]) {
+		case 'v':
+			if(isspace(line[1])) {
+				/* vertex */
+				struct vertex_pos v;
+				int num;
+
+				num = sscanf(line + 2, "%f %f %f", &v.x, &v.y, &v.z);
+				if(num < 3) {
+					fprintf(stderr, "%s:%d: invalid vertex definition: \"%s\"\n", fname, line_num, line);
+					goto err;
+				}
+				if(!(varr = dynarr_push(varr, &v))) {
+					fprintf(stderr, "load_mesh: failed to resize vertex buffer\n");
+					goto err;
+				}
+
+			} else if(line[1] == 't' && isspace(line[2])) {
+				/* texcoord */
+				cgm_vec2 tc;
+				if(sscanf(line + 3, "%f %f", &tc.x, &tc.y) != 2) {
+					fprintf(stderr, "%s:%d: invalid texcoord definition: \"%s\"\n", fname, line_num, line);
+					goto err;
+				}
+				tc.y = 1.0f - tc.y;
+				if(!(tarr = dynarr_push(tarr, &tc))) {
+					fprintf(stderr, "load_mesh: failed to resize texcoord buffer\n");
+					goto err;
+				}
+
+			} else if(line[1] == 'n' && isspace(line[2])) {
+				/* normal */
+				cgm_vec3 norm;
+				if(sscanf(line + 3, "%f %f %f", &norm.x, &norm.y, &norm.z) != 3) {
+					fprintf(stderr, "%s:%d: invalid normal definition: \"%s\"\n", fname, line_num, line);
+					goto err;
+				}
+				if(!(narr = dynarr_push(narr, &norm))) {
+					fprintf(stderr, "load_mesh: failed to resize normal buffer\n");
+					goto err;
+				}
+			}
+			break;
+
+		case 'f':
+			if(isspace(line[1])) {
+				/* face */
+				char *ptr = line + 2;
+				struct facevertex fv;
+				struct rbnode *node;
+				int vsz = dynarr_size(varr);
+				int tsz = dynarr_size(tarr);
+				int nsz = dynarr_size(narr);
+
+				for(i=0; i<4; i++) {
+					if(!(ptr = parse_face_vert(ptr, &fv, vsz, tsz, nsz))) {
+						if(i < 3 || found_quad) {
+							fprintf(stderr, "%s:%d: invalid face definition: \"%s\"\n", fname, line_num, line);
+							goto err;
+						} else {
+							break;
+						}
+					}
+
+					if((node = rb_find(rbtree, &fv))) {
+						unsigned int idx = (unsigned int)node->data;
+						assert(idx < cmesh_attrib_count(mesh, CMESH_ATTR_VERTEX));
+						if(cmesh_push_index(mesh, idx) == -1) {
+							fprintf(stderr, "load_mesh: failed to resize index array\n");
+							goto err;
+						}
+						subcount++;	/* inc number of submesh indices, in case we have submeshes */
+					} else {
+						unsigned int newidx = cmesh_attrib_count(mesh, CMESH_ATTR_VERTEX);
+						struct facevertex *newfv;
+						struct vertex_pos *vptr = varr + fv.vidx;
+
+						if(cmesh_push_attrib3f(mesh, CMESH_ATTR_VERTEX, vptr->x, vptr->y, vptr->z) == -1) {
+							fprintf(stderr, "load_mesh: failed to resize vertex array\n");
+							goto err;
+						}
+						if(fv.nidx >= 0) {
+							float nx = narr[fv.nidx].x;
+							float ny = narr[fv.nidx].y;
+							float nz = narr[fv.nidx].z;
+							if(cmesh_push_attrib3f(mesh, CMESH_ATTR_NORMAL, nx, ny, nz) == -1) {
+								fprintf(stderr, "load_mesh: failed to resize normal array\n");
+								goto err;
+							}
+						}
+						if(fv.tidx >= 0) {
+							float tu = tarr[fv.tidx].x;
+							float tv = tarr[fv.tidx].y;
+							if(cmesh_push_attrib2f(mesh, CMESH_ATTR_TEXCOORD, tu, tv) == -1) {
+								fprintf(stderr, "load_mesh: failed to resize texcoord array\n");
+								goto err;
+							}
+						}
+
+						if(cmesh_push_index(mesh, newidx) == -1) {
+							fprintf(stderr, "load_mesh: failed to resize index array\n");
+							goto err;
+						}
+						subcount++;	/* inc number of submesh indices, in case we have submeshes */
+
+						if((newfv = malloc(sizeof *newfv))) {
+							*newfv = fv;
+						}
+						if(!newfv || rb_insert(rbtree, newfv, (void*)newidx) == -1) {
+							fprintf(stderr, "load_mesh: failed to insert facevertex to the binary search tree\n");
+							goto err;
+						}
+					}
+				}
+				if(i > 3) found_quad = 1;
+			}
+			break;
+
+		case 'o':
+			if(subcount > 0) {
+				printf("adding submesh: %s\n", subname);
+				cmesh_submesh(mesh, subname, substart / 3, subcount / 3);
+			}
+			free(subname);
+			if((subname = malloc(strlen(line)))) {
+				strcpy(subname, clean_line(line + 2));
+			}
+			substart += subcount;
+			subcount = 0;
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	if(subcount > 0) {
+		/* don't add the final submesh if we never found another. an obj file with a
+		 * single 'o' for the whole list of faces, is a single mesh without submeshes
+		 */
+		if(cmesh_submesh_count(mesh) > 0) {
+			printf("adding submesh: %s\n", subname);
+			cmesh_submesh(mesh, subname, substart / 3, subcount / 3);
+		} else {
+			/* ... but use the 'o' name as the name of the mesh instead of the filename */
+			if(subname && *subname) {
+				cmesh_set_name(mesh, subname);
+			}
+		}
+	}
+
+	result = 0;	/* success */
+
+	printf("loaded %s mesh: %s (%d submeshes): %d vertices, %d faces\n",
+			found_quad ? "quad" : "triangle", fname, cmesh_submesh_count(mesh),
+			cmesh_attrib_count(mesh, CMESH_ATTR_VERTEX), cmesh_poly_count(mesh));
+
+err:
+	if(fp) fclose(fp);
+	dynarr_free(varr);
+	dynarr_free(narr);
+	dynarr_free(tarr);
+	rb_free(rbtree);
+	free(subname);
+	return result;
+}
+
+
+static char *clean_line(char *s)
+{
+	char *end;
+
+	while(*s && isspace(*s)) ++s;
+	if(!*s) return 0;
+
+	end = s;
+	while(*end && *end != '#') ++end;
+	*end-- = 0;
+
+	while(end > s && isspace(*end)) {
+		*end-- = 0;
+	}
+
+	return s;
+}
+
+static char *parse_idx(char *ptr, int *idx, int arrsz)
+{
+	char *endp;
+	int val = strtol(ptr, &endp, 10);
+	if(endp == ptr) return 0;
+
+	if(val < 0) {	/* convert negative indices */
+		*idx = arrsz + val;
+	} else {
+		*idx = val - 1;	/* indices in obj are 1-based */
+	}
+	return endp;
+}
+
+/* possible face-vertex definitions:
+ * 1. vertex
+ * 2. vertex/texcoord
+ * 3. vertex//normal
+ * 4. vertex/texcoord/normal
+ */
+static char *parse_face_vert(char *ptr, struct facevertex *fv, int numv, int numt, int numn)
+{
+	if(!(ptr = parse_idx(ptr, &fv->vidx, numv)))
+		return 0;
+	if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
+
+	if(*++ptr == '/') {	/* no texcoord */
+		fv->tidx = -1;
+		++ptr;
+	} else {
+		if(!(ptr = parse_idx(ptr, &fv->tidx, numt)))
+			return 0;
+		if(*ptr != '/') return (!*ptr || isspace(*ptr)) ? ptr : 0;
+		++ptr;
+	}
+
+	if(!(ptr = parse_idx(ptr, &fv->nidx, numn)))
+		return 0;
+	return (!*ptr || isspace(*ptr)) ? ptr : 0;
+}
+
+static int cmp_facevert(const void *ap, const void *bp)
+{
+	const struct facevertex *a = ap;
+	const struct facevertex *b = bp;
+
+	if(a->vidx == b->vidx) {
+		if(a->tidx == b->tidx) {
+			return a->nidx - b->nidx;
+		}
+		return a->tidx - b->tidx;
+	}
+	return a->vidx - b->vidx;
+}
+
+static void free_rbnode_key(struct rbnode *n, void *cls)
+{
+	free(n->key);
+}
+#endif