solstice

commit 23a0f784333e50b0299ace85216a458a8c4e7fa8
parent 4e0b67f94c022c5cde8e504b241b83d3006aec49
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Wed, 22 Feb 2017 17:16:14 +0100

First implementation of the dump_obj functionality

Diffstat:
M
cmake/CMakeLists.txt
 | 
1
+
M
src/solstice_c.h
 | 
4
++++
A
src/solstice_dump_obj.c
 | 
98
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3 files changed, 103 insertions(+), 0 deletions(-)
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
@@ -86,6 +86,7 @@ set(SOLSTICE_FILES_SRC
   solstice.c
   solstice_args.c
   solstice_draw.c
+  solstice_dump_obj.c
   solstice_entity.c
   solstice_material.c
   solstice_node.c
diff --git a/src/solstice_c.h b/src/solstice_c.h
@@ -50,6 +50,10 @@ solstice_solve
   (struct solstice* solstice);
 
 extern LOCAL_SYM res_T
+solstice_dump_obj
+  (struct solstice* solstice);
+
+extern LOCAL_SYM res_T
 solstice_create_sun
   (struct solstice* solstice);
 
diff --git a/src/solstice_dump_obj.c b/src/solstice_dump_obj.c
@@ -0,0 +1,98 @@
+/* Copyright (C) CNRS 2016-2017
+ *
+ * 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/>. */
+
+#include "solstice_c.h"
+#include <solstice/ssol.h>
+
+struct dump_context {
+  FILE* output;
+  size_t ids_offset;
+};
+
+/*******************************************************************************
+ * Helper functions
+ ******************************************************************************/
+static void
+dump_instantiated_shaded_shape
+  (struct ssol_instantiated_shaded_shape* sshape, struct dump_context* ctx)
+{
+  unsigned i, ntris, nverts;
+  ASSERT(sshape && ctx);
+
+  SSOL(shape_get_vertices_count(sshape->shape, &nverts));
+  FOR_EACH(i, 0, nverts) {
+    double pos[3];
+    SSOL(instantiated_shaded_shape_get_vertex_attrib
+      (sshape, i, SSOL_POSITION, pos));
+    fprintf(ctx->output, "v %g %g %g\n", SPLIT3(pos));
+  }
+
+  SSOL(shape_get_triangles_count(sshape->shape, &ntris));
+  FOR_EACH(i, 0, ntris) {
+    unsigned ids[3];
+    SSOL(shape_get_triangle_indices(sshape->shape, i, ids));
+    /* Note that in the obj fileformat the first index is 1 rather than 0 */
+    fprintf(ctx->output, "f %lu %lu %lu\n",
+      (unsigned long)(ids[0] + 1 + ctx->ids_offset),
+      (unsigned long)(ids[1] + 1 + ctx->ids_offset),
+      (unsigned long)(ids[2] + 1 + ctx->ids_offset));
+  }
+
+  ctx->ids_offset += nverts;
+}
+
+static res_T
+dump_instance(struct ssol_instance* instance, void* context)
+{
+  struct dump_context* ctx = context;
+  size_t i, n;
+  ASSERT(instance && ctx);
+
+  SSOL(instance_get_shaded_shapes_count(instance, &n));
+  FOR_EACH(i, 0, n) {
+    struct ssol_instantiated_shaded_shape sshape;
+
+    SSOL(instance_get_shaded_shape(instance, i, &sshape));
+    dump_instantiated_shaded_shape(&sshape, ctx);
+  }
+
+  return RES_OK;
+}
+
+/*******************************************************************************
+ * Local functions
+ ******************************************************************************/
+res_T
+solstice_dump_obj(struct solstice* solstice)
+{
+  struct dump_context ctx;
+  res_T res = RES_OK;
+  ASSERT(solstice);
+
+  ctx.output = solstice->output;
+  ctx.ids_offset = 0;
+
+  res = ssol_scene_for_each_instance(solstice->scene, dump_instance, &ctx);
+  if(res != RES_OK) {
+    fprintf(stderr, "Could not dump the solstice geometry.\n");
+    goto error;
+  }
+
+exit:
+  return res;
+error:
+  goto exit;
+}
+