commit d2e10e8b4e1f8b692033c09e68502b15d85c372e
Author: Vincent Forest <vincent.forest@meso-star.com>
Date: Wed, 21 May 2025 17:44:57 +0200
Filtering repeated triangles
Implement an API that proposes the beginnings of a structure from a soup
of triangles, filtering out repeated triangles while building an indexed
mesh of the remaining triangles.
While the code compiles without error or warning, nothing has yet been
tested.
Diffstat:
| A | COPYING | | | 674 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Makefile | | | 161 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | README.md | | | 24 | ++++++++++++++++++++++++ |
| A | config.mk | | | 82 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/suniq.c | | | 416 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/suniq.h | | | 121 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | suniq.pc.in | | | 10 | ++++++++++ |
7 files changed, 1488 insertions(+), 0 deletions(-)
diff --git a/COPYING b/COPYING
@@ -0,0 +1,674 @@
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,161 @@
+# Copyright (C) 2025 |Méso|Star> (contact@meso-star.com)
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+.POSIX:
+
+include config.mk
+
+LIBNAME_STATIC = libsuniq.a
+LIBNAME_SHARED = libsuniq.so
+LIBNAME = $(LIBNAME_$(LIB_TYPE))
+
+default: library
+all: default tests util
+
+################################################################################
+# Library
+################################################################################
+SRC = src/suniq.c
+OBJ = $(SRC:.c=.o)
+DEP = $(SRC:.c=.d)
+
+CFLAGS_LIB = $(CFLAGS_SO) $(INCS) -DSUNIQ_SHARED_BUILD
+LDFLAGS_LIB = $(LDFLAGS_SO) $(LIBS)
+
+library: .config $(DEP)
+ @$(MAKE) -fMakefile $$(for i in $(DEP); do echo -f $${i}; done) \
+ $$(if [ -n "$(LIBNAME)" ]; then\
+ echo "$(LIBNAME)";\
+ else\
+ echo "$(LIBNAME_SHARED)";\
+ fi)
+
+$(DEP) $(OBJ): config.mk
+
+$(LIBNAME_SHARED): $(OBJ)
+ $(CC) $(CFLAGS_LIB) -o $@ $(OBJ) $(LDFLAGS_LIB)
+
+$(LIBNAME_STATIC): libsuniq.o
+ $(AR) -rc $@ $?
+ $(RANLIB) $@
+
+libsmsh.o: $(OBJ)
+ $(LD) -r $(OBJ) -o $@
+ $(OBJCOPY) $(OCPFLAGS) $@
+
+.config: config.mk
+ $(PKG_CONFIG) --atleast-version $(RSYS_VERSION) rsys
+ @echo "config done" > $@
+
+.SUFFIXES: .c .d .o
+.c.d:
+ @$(CC) $(CFLAGS_LIB) -MM -MT "$(@:.d=.o) $@" $< -MF $@
+
+.c.o:
+ $(CC) $(CFLAGS_LIB) -c $< -o $@
+
+################################################################################
+# Miscellaneous
+################################################################################
+pkg:
+ sed -e 's#@PREFIX@#$(PREFIX)#g' \
+ -e 's#@VERSION@#$(VERSION)#g' \
+ -e 's#@RSYS_VERSION@#$(RSYS_VERSION)#g' \
+ suniq.pc.in > suniq.pc
+
+suniq-local.pc: suniq.pc.in
+ sed -e '1d'\
+ -e 's#^includedir=.*#includedir=./src/#'\
+ -e 's#^libdir=.*#libdir=./#'\
+ -e 's#@VERSION@#$(VERSION)#g'\
+ -e 's#@RSYS_VERSION@#$(RSYS_VERSION)#g'\
+ smeteo.pc.in > $@
+
+install: library util pkg
+ install() { mode="$$1"; prefix="$$2"; shift 2; \
+ mkdir -p "$${prefix}"; \
+ cp "$$@" "$${prefix}"; \
+ chmod "$${mode}" "$$@"; \
+ }; \
+ install 755 "$(DESTDIR)$(LIBPREFIX)" $(LIBNAME); \
+ install 644 "$(DESTDIR)$(LIBPREFIX)/pkgconfig" suniq.pc; \
+ install 644 "$(DESTDIR)$(INCPREFIX)/star" src/suniq.h; \
+ install 644 "$(DESTDIR)$(PREFIX)/share/doc/star-uniq" COPYING README.md
+
+uninstall:
+ rm -f "$(DESTDIR)$(LIBPREFIX)/$(LIBNAME)"
+ rm -f "$(DESTDIR)$(LIBPREFIX)/pkgconfig/suniq.pc"
+ rm -f "$(DESTDIR)$(INCPREFIX)/star/suniq.h"
+ rm -f "$(DESTDIR)$(PREFIX)/share/doc/star-uniq/COPYING"
+ rm -f "$(DESTDIR)$(PREFIX)/share/doc/star-uniq/README.md"
+
+clean: #clean_test
+ rm -f $(DEP) $(OBJ) $(LIBNAME)
+ rm -f .config libsuniq.o suniq.pc suniq-local.pc
+
+################################################################################
+# Tests
+################################################################################
+TEST_SRC = #src/test_suniq.c
+TEST_OBJ = $(TEST_SRC:.c=.o)
+TEST_DEP = $(TEST_SRC:.c=.d)
+TEST_TGT = $(TEST_SRC:.c=.t)
+
+PKG_CONFIG_LOCAL = PKG_CONFIG_PATH="./:$${PKG_CONFIG_PATH}" $(PKG_CONFIG)
+INCS_TEST = $$($(PKG_CONFIG_LOCAL) $(PCFLAGS) --cflags rsys suniq-local.pc)
+LIBS_TEST = $$($(PKG_CONFIG_LOCAL) $(PCFLAGS) --libs rsys suniq-local.pc)
+
+CFLAGS_TEST = -std=c89 $(CFLAGS_EXE) $(INCS_TEST)
+LDFLAGS_TEST = $(LDFLAGS_EXE) $(LIBS_TEST)
+
+tests: library $(TEST_DEP) $(TEST_BIN)
+ @$(MAKE) -fMakefile \
+ $$(for i in $(TEST_DEP); do echo -f"$${i}"; done) \
+ $$(for i in $(TEST_TGT); do echo -f"$${i}"; done) \
+ test_list
+
+$(TEST_TGT):
+ @{ \
+ exe="$$(basename "$@" ".t")"; \
+ printf '%s: %s\n' "$${exe}" $(@:.t=.o); \
+ printf 'test_list: %s\n' "$${exe}"; \
+ } > $@
+
+$(TEST_DEP): config.mk suniq-local.pc
+ @$(CC) $(CFLAGS_TEST) -MM -MT "$(@:.d=.o) $@" $(@:.d=.c) -MF $@
+
+$(TEST_OBJ): config.mk suniq-local.pc
+ $(CC) $(CFLAGS_TEST) -c $(@:.o=.c) -o $@
+
+test_suniq \
+: config.mk suniq-local.pc $(LIBNAME)
+ $(CC) $(CFLAGS_TEST) -o $@ src/$@.o $(LDFLAGS_TEST)
+
+clean_test:
+ rm -f $(TEST_DEP) $(TEST_OBJ) $(TEST_TGT)
+ for i in $(TEST_SRC); do rm -f "$$(basename "$${i}" ".c")"; done
+
+test: tests
+ @err=0; \
+ for i in $(TEST_SRC); do \
+ test="$$(basename "$${i}" ".c")"; \
+ if "./$${test}" > /dev/null 2>&1; then \
+ printf '%s\n' "$${test}"; \
+ else \
+ >&2 printf '%s: error %s\n' "$${test}" "$$?"; \
+ err=$$((err+1)); \
+ fi \
+ done; \
+ [ "$${err}" -eq 0 ]
diff --git a/README.md b/README.md
@@ -0,0 +1,24 @@
+# Star Uniq
+
+Filter out repeated triangles.
+
+## Requirements
+
+- C compiler
+- POSIX make
+- pkg-config
+- [RSys](https://gitlab.com/vaplv/rsys/)
+
+## Installation
+
+Edit config.mk as needed, then run:
+
+ make clean install
+
+## License
+
+Copyright (C) 2025 |Méso|Star> (contact@meso-star.com)
+
+Star-STL is free software released under GPL v3+ license: GNU GPL
+version 3 or later. You are welcome to redistribute it under certain
+conditions; refer to the COPYING file for details.
diff --git a/config.mk b/config.mk
@@ -0,0 +1,82 @@
+VERSION = 0.0.0
+PREFIX = /usr/local
+
+LIB_TYPE = SHARED
+#LIB_TYPE = STATIC
+
+BUILD_TYPE = RELEASE
+#BUILD_TYPE = DEBUG
+
+BINPREFIX = $(PREFIX)/bin
+LIBPREFIX = $(PREFIX)/lib
+INCPREFIX = $(PREFIX)/include
+MANPREFIX = $(PREFIX)/share/man
+
+################################################################################
+# Tools
+################################################################################
+AR = ar
+CC = cc
+LD = ld
+OBJCOPY = objcopy
+PKG_CONFIG = pkg-config
+RANLIB = ranlib
+
+################################################################################
+# Dependencies
+################################################################################
+PCFLAGS_SHARED =
+PCFLAGS_STATIC = --static
+PCFLAGS = $(PCFLAGS_$(LIB_TYPE))
+
+RSYS_VERSION = 0.14
+INCS = $$($(PKG_CONFIG) $(PCFLAGS) --cflags rsys)
+LIBS = $$($(PKG_CONFIG) $(PCFLAGS) --libs rsys)
+
+################################################################################
+# Compilation options
+################################################################################
+WFLAGS =\
+ -Wall\
+ -Wcast-align\
+ -Wconversion\
+ -Wextra\
+ -Wmissing-declarations\
+ -Wmissing-prototypes\
+ -Wshadow
+
+CFLAGS_HARDENED =\
+ -D_FORTIFY_SOURCES=2\
+ -fcf-protection=full\
+ -fstack-clash-protection\
+ -fstack-protector-strong
+
+CFLAGS_COMMON =\
+ -std=c89\
+ -pedantic\
+ -fvisibility=hidden\
+ -fstrict-aliasing\
+ $(CFLAGS_HARDENED)\
+ $(WFLAGS)
+
+CFLAGS_DEBUG = -g $(CFLAGS_COMMON)
+CFLAGS_RELEASE = -O2 -DNDEBUG $(CFLAGS_COMMON)
+CFLAGS = $(CFLAGS_$(BUILD_TYPE))
+
+CFLAGS_SO = $(CFLAGS) -fPIC
+CFLAGS_EXE = $(CFLAGS) -fPIE
+
+################################################################################
+# Linker options
+################################################################################
+LDFLAGS_HARDENED = -Wl,-z,relro,-z,now
+LDFLAGS_DEBUG = $(LDFLAGS_HARDENED)
+LDFLAGS_RELEASE = -s $(LDFLAGS_HARDENED)
+LDFLAGS = $(LDFLAGS_$(BUILD_TYPE))
+
+LDFLAGS_SO = $(LDFLAGS) -shared -Wl,--no-undefined
+LDFLAGS_EXE = $(LDFLAGS) -pie
+
+OCPFLAGS_DEBUG = --localize-hidden
+OCPFLAGS_RELEASE = --localize-hidden --strip-unneeded
+OCPFLAGS = $(OCPFLAGS_$(BUILD_TYPE))
diff --git a/src/suniq.c b/src/suniq.c
@@ -0,0 +1,416 @@
+/* Copyright (C) 2025 |Méso|Star> (contact@meso-star.com)
+ *
+ * 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 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "suniq.h"
+
+#include <rsys/double3.h>
+#include <rsys/dynamic_array_double.h>
+#include <rsys/dynamic_array_size_t.h>
+#include <rsys/hash_table.h>
+#include <rsys/mem_allocator.h>
+#include <rsys/ref_count.h>
+
+struct pos { double xyz[3]; };
+static const struct pos POS_NULL = {0};
+
+static INLINE size_t
+pos_hash(const struct pos* pos)
+{
+ ASSERT(pos);
+ return (size_t)hash_fnv64(pos->xyz, sizeof(pos->xyz));
+}
+
+static INLINE char
+pos_eq(const struct pos* a, const struct pos* b)
+{
+ ASSERT(a && b);
+ return (char)d3_eq(a->xyz, b->xyz);
+}
+
+struct key {
+ double sorted_vertices__[3][3]; /* Internal data */
+};
+static const struct key KEY_NULL = {0};
+
+static INLINE size_t
+key_hash(const struct key* key)
+{
+ double d[9];
+ ASSERT(key);
+ d3_set(d+0, key->sorted_vertices__[0]);
+ d3_set(d+3, key->sorted_vertices__[1]);
+ d3_set(d+6, key->sorted_vertices__[2]);
+ return (size_t)hash_fnv64(d, sizeof(d));
+}
+
+static INLINE char
+key_eq(const struct key* a, const struct key* b)
+{
+ ASSERT(a && b);
+ return (char)
+ ( d3_eq(a->sorted_vertices__[0], b->sorted_vertices__[0])
+ && d3_eq(a->sorted_vertices__[1], b->sorted_vertices__[1])
+ && d3_eq(a->sorted_vertices__[2], b->sorted_vertices__[2]));
+}
+
+/* Generate the hash table that maps a triangle key to an index */
+#define HTABLE_NAME key2itri
+#define HTABLE_KEY struct key
+#define HTABLE_KEY_FUNCTOR_HASH key_hash
+#define HTABLE_KEY_FUNCTOR_EQ key_eq
+#define HTABLE_DATA size_t
+#include <rsys/hash_table.h>
+
+/* Generate the hash table that maps a position to an index */
+#define HTABLE_NAME pos2ivtx
+#define HTABLE_KEY struct pos
+#define HTABLE_KEY_FUNCTOR_HASH pos_hash
+#define HTABLE_KEY_FUNCTOR_EQ pos_eq
+#define HTABLE_DATA size_t
+#include <rsys/hash_table.h>
+
+struct suniq {
+ struct mem_allocator* allocator;
+
+ struct htable_key2itri key2itri;
+ struct htable_pos2ivtx pos2ivtx;
+
+ struct darray_size_t indices; /* List of size_t[3] */
+ struct darray_double positions; /* List of double[3] */
+ ref_T ref;
+};
+
+/*******************************************************************************
+ * Helper functions
+ ******************************************************************************/
+/* Return an integer greater than, equal to, or less than 0, if a is greater
+ * than, equal to, or less than b, respectively */
+static INLINE int
+cmp_d3(const double a[3], const double b[3])
+{
+ ASSERT(a && b);
+ return a[0] < b[0] ? -1 : a[0] > b[0] ? +1
+ : a[1] < b[1] ? -1 : a[1] > b[1] ? +1
+ : a[2] < b[2] ? -1 : a[2] > b[2] ? +1
+ : 0;
+}
+
+static void
+key_setup(struct key* key, const struct suniq_triangle* tri)
+{
+ double (*v)[3] = NULL;
+
+ ASSERT(key && tri);
+
+ d3_set(key->sorted_vertices__[0], tri->vertices[0]);
+ d3_set(key->sorted_vertices__[1], tri->vertices[1]);
+ d3_set(key->sorted_vertices__[2], tri->vertices[2]);
+
+ #define SWAP3(A, B) { \
+ SWAP(double, A[0], B[0]); \
+ SWAP(double, A[1], B[1]); \
+ SWAP(double, A[2], B[2]); \
+ } (void)0
+
+ /* Bubble sort (ascending order) */
+ v = key->sorted_vertices__;
+ if(cmp_d3(v[0], v[1]) > 0) SWAP3(v[0], v[1]);
+ if(cmp_d3(v[1], v[2]) > 0) SWAP3(v[1], v[2]);
+ if(cmp_d3(v[0], v[1]) > 0) SWAP3(v[0], v[1]);
+
+ #undef SWAP3
+}
+
+static res_T
+save_vertex(struct suniq* suniq, const struct pos* vertex, size_t* out_ivtx)
+{
+ size_t ivtx = SIZE_MAX; /* Vertex index */
+ int i = 0;
+ res_T res = RES_OK;
+
+ ASSERT(suniq && vertex && out_ivtx);
+
+ /* Define the vertex index */
+ ivtx = darray_double_size_get(&suniq->positions) / 3/*#coords per vertex*/;
+
+ /* Save vertex coordinates */
+ FOR_EACH(i, 0, 3) {
+ res = darray_double_push_back(&suniq->positions, &vertex->xyz[i]);
+ if(res != RES_OK) goto error;
+ }
+
+ /* Register the vertex */
+ res = htable_pos2ivtx_set(&suniq->pos2ivtx, vertex, &ivtx);
+ if(res != RES_OK) goto error;
+
+exit:
+ *out_ivtx = ivtx;
+ return res;
+error:
+ ivtx = SIZE_MAX;
+ goto exit;
+}
+
+static res_T
+register_vertex(struct suniq* suniq, const double vertex[3], size_t* out_id)
+{
+ struct pos pos = POS_NULL;
+ size_t* vertex_exist = NULL;
+ size_t id = SIZE_MAX;
+ res_T res = RES_OK;
+
+ ASSERT(suniq && vertex && out_id);
+
+ d3_set(pos.xyz, vertex);
+
+ vertex_exist = htable_pos2ivtx_find(&suniq->pos2ivtx, &pos);
+ if(vertex_exist) {
+ id = *vertex_exist;
+ } else {
+ res = save_vertex(suniq, &pos, &id);
+ if(res != RES_OK) goto error;
+ }
+
+exit:
+ *out_id = id;
+ return res;
+error:
+ id = SIZE_MAX;
+ goto exit;
+}
+
+static res_T
+save_triangle
+ (struct suniq* suniq,
+ const struct suniq_triangle* triangle,
+ const struct key* key,
+ size_t* out_itri)
+{
+ size_t itri = SIZE_MAX; /* Trinngle index */
+ int i = 0;
+ res_T res = RES_OK;
+
+ ASSERT(suniq && triangle && key && out_itri);
+
+ /* Define the triangle index */
+ itri = darray_size_t_size_get(&suniq->indices) / 3/*#verices par triangle*/;
+
+ /* Save triangle indices */
+ FOR_EACH(i, 0, 3) {
+ size_t ivtx = 0;
+
+ res = register_vertex(suniq, triangle->vertices[i], &ivtx);
+ if(res != RES_OK) goto error;
+ res = darray_size_t_push_back(&suniq->indices, &ivtx);
+ if(res != RES_OK) goto error;
+ }
+
+ /* Register the triangle */
+ res = htable_key2itri_set(&suniq->key2itri, key, &itri);
+ if(res != RES_OK) goto error;
+
+exit:
+ *out_itri = itri;
+ return res;
+error:
+ itri = SIZE_MAX;
+ goto exit;
+}
+
+static void
+release_suniq(ref_T* ref)
+{
+ struct suniq* suniq = CONTAINER_OF(ref, struct suniq, ref);
+
+ ASSERT(ref);
+
+ htable_key2itri_release(&suniq->key2itri);
+ htable_pos2ivtx_release(&suniq->pos2ivtx);
+ darray_size_t_release(&suniq->indices);
+ darray_double_release(&suniq->positions);
+ MEM_RM(suniq->allocator, suniq);
+}
+
+/*******************************************************************************
+ * Exported functions
+ ******************************************************************************/
+res_T
+suniq_create(const struct suniq_create_args* args, struct suniq** out_suniq)
+{
+ struct mem_allocator* allocator = NULL;
+ struct suniq* suniq = NULL;
+ res_T res = RES_OK;
+
+ if(!args || !out_suniq) { res = RES_BAD_ARG; goto error; }
+
+ allocator = args->allocator ? args->allocator : &mem_default_allocator;
+ suniq = MEM_CALLOC(allocator, 1, sizeof(*suniq));
+ if(!suniq) { res = RES_MEM_ERR; goto error; }
+
+ ref_init(&suniq->ref);
+ suniq->allocator = allocator;
+ htable_key2itri_init(suniq->allocator, &suniq->key2itri);
+ htable_pos2ivtx_init(suniq->allocator, &suniq->pos2ivtx);
+ darray_size_t_init(suniq->allocator, &suniq->indices);
+ darray_double_init(suniq->allocator, &suniq->positions);
+
+exit:
+ if(out_suniq) *out_suniq = suniq;
+ return res;
+error:
+ if(suniq) { SUNIQ(ref_put(suniq)); suniq = NULL; }
+ goto exit;
+}
+
+res_T
+suniq_ref_get(struct suniq* suniq)
+{
+ return suniq ? ref_get(&suniq->ref), RES_OK : RES_BAD_ARG;
+}
+
+res_T
+suniq_ref_put(struct suniq* suniq)
+{
+ return suniq ? ref_put(&suniq->ref, release_suniq), RES_OK : RES_BAD_ARG;
+}
+
+res_T
+suniq_register_triangle
+ (struct suniq* suniq,
+ const struct suniq_triangle* tri,
+ size_t* out_id) /* Can be NULL */
+{
+ struct key key = KEY_NULL;
+ size_t* triangle_exist = NULL;
+ size_t id = SIZE_MAX; /* Index of the triangle */
+ res_T res = RES_OK;
+
+ if(!suniq || !tri) { res = RES_BAD_ARG; goto error; }
+
+ key_setup(&key, tri);
+
+ triangle_exist = htable_key2itri_find(&suniq->key2itri, &key);
+ if(triangle_exist) {
+ id = *triangle_exist;
+ } else {
+ res = save_triangle(suniq, tri, &key, &id);
+ if(res != RES_OK) goto error;
+ }
+
+exit:
+ if(out_id) *out_id = id;
+ return res;
+error:
+ id = SIZE_MAX;
+ goto exit;
+}
+
+res_T
+suniq_get_triangle
+ (const struct suniq* suniq,
+ const size_t id,
+ struct suniq_triangle* triangle)
+{
+ struct suniq_desc desc = SUNIQ_DESC_NULL;
+ res_T res = RES_OK;
+
+ if((res = suniq_get_desc(suniq, &desc)) != RES_OK) goto error;
+ if((res = suniq_desc_get_triangle(&desc, id, triangle)) != RES_OK) goto error;
+
+exit:
+ return res;
+error:
+ goto exit;
+}
+
+res_T
+suniq_get_desc(const struct suniq* suniq, struct suniq_desc* desc)
+{
+ if(!suniq || !desc) return RES_BAD_ARG;
+ desc->indices = darray_size_t_cdata_get(&suniq->indices);
+ desc->positions = darray_double_cdata_get(&suniq->positions);
+ desc->ntriangles = darray_size_t_size_get(&suniq->indices)/3/*#ids*/;
+ desc->nvertices = darray_double_size_get(&suniq->positions)/3/*#coords*/;
+ return RES_OK;
+}
+
+res_T
+suniq_desc_get_vertex
+ (const struct suniq_desc* desc,
+ const size_t ivertex,
+ double vertex[3])
+{
+ if(!desc || ivertex >= desc->nvertices || !vertex) return RES_BAD_ARG;
+
+ vertex[0] = desc->positions[ivertex*3/*#coords per vertex*/+0];
+ vertex[1] = desc->positions[ivertex*3/*#coords per vertex*/+1];
+ vertex[2] = desc->positions[ivertex*3/*#coords per vertex*/+2];
+
+ return RES_OK;
+}
+
+res_T
+suniq_desc_get_triangle_indices
+ (const struct suniq_desc* desc,
+ const size_t itriangle,
+ size_t indices[3])
+{
+ if(!desc || itriangle >= desc->ntriangles || !indices) return RES_BAD_ARG;
+
+ indices[0] = desc->indices[itriangle*3/*#indices per triangle*/+0];
+ indices[1] = desc->indices[itriangle*3/*#indices per triangle*/+1];
+ indices[2] = desc->indices[itriangle*3/*#indices per triangle*/+2];
+
+ return RES_OK;
+}
+
+res_T
+suniq_desc_get_triangle
+ (const struct suniq_desc* desc,
+ const size_t itriangle,
+ struct suniq_triangle* triangle)
+{
+ size_t indices[3] = {0,0,0};
+ int i = 0;
+ res_T res = RES_OK;
+
+ if(!triangle) { res = RES_BAD_ARG; goto error; }
+
+ res = suniq_desc_get_triangle_indices(desc, itriangle, indices);
+ if(res != RES_OK) goto error;
+
+ FOR_EACH(i, 0, 3) {
+ res = suniq_desc_get_vertex(desc, indices[i], triangle->vertices[i]);
+ if(res != RES_OK) goto error;
+ }
+
+exit:
+ return res;
+error:
+ goto exit;
+}
+
+res_T
+suniq_clear(struct suniq* suniq)
+{
+ if(!suniq) return RES_BAD_ARG;
+
+ htable_key2itri_clear(&suniq->key2itri);
+ htable_pos2ivtx_clear(&suniq->pos2ivtx);
+ darray_size_t_clear(&suniq->indices);
+ darray_double_clear(&suniq->positions);
+
+ return RES_OK;
+}
diff --git a/src/suniq.h b/src/suniq.h
@@ -0,0 +1,121 @@
+/* Copyright (C) 2025 |Méso|Star> (contact@meso-star.com)
+ *
+ * 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 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifndef SUNIQ_H
+#define SUNIQ_H
+
+#include <rsys/rsys.h>
+
+/* Library symbol management */
+#if defined(SUNIQ_SHARED_BUILD)
+ #define SUNIQ_API extern EXPORT_SYM
+#else
+ #define SUNIQ_API extern IMPORT_SYM
+#endif
+
+/* Help macro which, in debug mode, stops execution when API functions fail
+ * To be used when calling functions for which there is no error handling */
+#ifndef NDEBUG
+ #define SUNIQ(Func) ASSERT(suniq_ ## Func == RES_OK)
+#else
+ #define SUNIQ(Func) suniq_ ## Func
+#endif
+
+/* Forward declaration of opaque data types */
+struct logger;
+struct mem_allocator;
+
+struct suniq_create_args {
+ struct mem_allocator* allocator; /* NULL <=> use default allocator */
+};
+#define SUNIQ_CREATE_ARGS_DEFAULT__ {NULL}
+static const struct suniq_create_args SUNIQ_CREATE_ARGS_DEFAULT =
+ SUNIQ_CREATE_ARGS_DEFAULT__;
+
+struct suniq_triangle {
+ double vertices[3][3];
+};
+#define SUNIQ_TRIANGLE_NULL__ {{{0,0,0},{0,0,0},{0,0,0}}}
+static const struct suniq_triangle SUNIQ_TRIANGLE_NULL = SUNIQ_TRIANGLE_NULL__;
+
+struct suniq_desc {
+ const size_t* indices;
+ const double* positions;
+ size_t ntriangles;
+ size_t nvertices;
+};
+#define SUNIQ_DESC_NULL__ {NULL,NULL,0,0}
+static const struct suniq_desc SUNIQ_DESC_NULL = SUNIQ_DESC_NULL__;
+
+/* Forward declaration of opaque data types */
+struct suniq;
+
+BEGIN_DECLS
+
+SUNIQ_API res_T
+suniq_create
+ (const struct suniq_create_args* args,
+ struct suniq** suniq);
+
+SUNIQ_API res_T
+suniq_ref_get
+ (struct suniq* suniq);
+
+SUNIQ_API res_T
+suniq_ref_put
+ (struct suniq* suniq);
+
+SUNIQ_API res_T
+suniq_register_triangle
+ (struct suniq* suniq,
+ const struct suniq_triangle* triangle,
+ size_t* id); /* NULL <=> do not return the triangle identifier */
+
+SUNIQ_API res_T
+suniq_get_triangle
+ (const struct suniq* suniq,
+ const size_t id,
+ struct suniq_triangle* triangle);
+
+SUNIQ_API res_T
+suniq_get_desc
+ (const struct suniq* suniq,
+ struct suniq_desc* desc);
+
+SUNIQ_API res_T
+suniq_desc_get_vertex
+ (const struct suniq_desc* desc,
+ const size_t ivertex,
+ double vertex[3]);
+
+SUNIQ_API res_T
+suniq_desc_get_triangle_indices
+ (const struct suniq_desc* desc,
+ const size_t itriangle,
+ size_t indices[3]);
+
+SUNIQ_API res_T
+suniq_desc_get_triangle
+ (const struct suniq_desc* desc,
+ const size_t itriangle,
+ struct suniq_triangle* triangle);
+
+SUNIQ_API res_T
+suniq_clear
+ (struct suniq* suniq);
+
+END_DECLS
+
+#endif /* SUNIQ_H */
diff --git a/suniq.pc.in b/suniq.pc.in
@@ -0,0 +1,10 @@
+prefix=@PREFIX@
+includedir=${prefix}/include
+libdir=${prefix}/lib
+
+Requires: rsys >= @RSYS_VERSION@
+Name: Star-Uniq
+Description: Filter out repeated triangles
+Version: @VERSION@
+Libs: -L${libdir} -lsuniq
+CFlags: -I${includedir}
