diff options
Diffstat (limited to 'source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc')
| -rw-r--r-- | source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc | 58 |
1 files changed, 55 insertions, 3 deletions
diff --git a/source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc b/source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc index a627e7261e3..ee55dd1e45a 100644 --- a/source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc +++ b/source/blender/io/wavefront_obj/importer/obj_import_file_reader.cc @@ -5,12 +5,15 @@ */ #include "BLI_map.hh" +#include "BLI_math_color.h" #include "BLI_string_ref.hh" #include "BLI_vector.hh" #include "obj_import_file_reader.hh" #include "obj_import_string_utils.hh" +#include <charconv> + namespace blender::io::obj { using std::string; @@ -34,6 +37,7 @@ static Geometry *create_geometry(Geometry *const prev_geometry, g->geom_type_ = new_type; g->geometry_name_ = name.is_empty() ? "New object" : name; g->vertex_start_ = global_vertices.vertices.size(); + g->vertex_color_start_ = global_vertices.vertex_colors.size(); r_offset.set_index_offset(g->vertex_start_); return g; }; @@ -71,9 +75,51 @@ static void geom_add_vertex(Geometry *geom, GlobalVertices &r_global_vertices) { float3 vert; - parse_floats(p, end, 0.0f, vert, 3); + p = parse_floats(p, end, 0.0f, vert, 3); r_global_vertices.vertices.append(vert); geom->vertex_count_++; + /* OBJ extension: `xyzrgb` vertex colors, when the vertex position + * is followed by 3 more RGB color components. See + * http://paulbourke.net/dataformats/obj/colour.html */ + if (p < end) { + float3 srgb; + p = parse_floats(p, end, -1.0f, srgb, 3); + if (srgb.x >= 0 && srgb.y >= 0 && srgb.z >= 0) { + float3 linear; + srgb_to_linearrgb_v3_v3(linear, srgb); + r_global_vertices.vertex_colors.append(linear); + geom->vertex_color_count_++; + } + } +} + +static void geom_add_mrgb_colors(Geometry *geom, + const char *p, + const char *end, + GlobalVertices &r_global_vertices) +{ + /* MRGB color extension, in the form of + * "#MRGB MMRRGGBBMMRRGGBB ..." + * http://paulbourke.net/dataformats/obj/colour.html */ + p = drop_whitespace(p, end); + const int mrgb_length = 8; + while (p + mrgb_length <= end) { + uint32_t value = 0; + std::from_chars_result res = std::from_chars(p, p + mrgb_length, value, 16); + if (res.ec == std::errc::invalid_argument || res.ec == std::errc::result_out_of_range) { + return; + } + unsigned char srgb[4]; + srgb[0] = (value >> 16) & 0xFF; + srgb[1] = (value >> 8) & 0xFF; + srgb[2] = value & 0xFF; + srgb[3] = 0xFF; + float linear[4]; + srgb_to_linearrgb_uchar4(linear, srgb); + r_global_vertices.vertex_colors.append({linear[0], linear[1], linear[2]}); + geom->vertex_color_count_++; + p += mrgb_length; + } } static void geom_add_vertex_normal(Geometry *geom, @@ -149,7 +195,7 @@ static void geom_add_polygon(Geometry *geom, if (p < end && *p == '/') { ++p; p = parse_int(p, end, INT32_MAX, corner.vertex_normal_index, false); - got_normal = corner.uv_vert_index != INT32_MAX; + got_normal = corner.vertex_normal_index != INT32_MAX; } } /* Always keep stored indices non-negative and zero-based. */ @@ -172,7 +218,10 @@ static void geom_add_polygon(Geometry *geom, face_valid = false; } } - if (got_normal) { + /* Ignore corner normal index, if the geometry does not have any normals. + * Some obj files out there do have face definitions that refer to normal indices, + * without any normals being present (T98782). */ + if (got_normal && geom->has_vertex_normals_) { corner.vertex_normal_index += corner.vertex_normal_index < 0 ? global_vertices.vertex_normals.size() : -1; @@ -482,6 +531,9 @@ void OBJParser::parse(Vector<std::unique_ptr<Geometry>> &r_all_geometries, else if (parse_keyword(p, end, "mtllib")) { add_mtl_library(StringRef(p, end).trim()); } + else if (parse_keyword(p, end, "#MRGB")) { + geom_add_mrgb_colors(curr_geom, p, end, r_global_vertices); + } /* Comments. */ else if (*p == '#') { /* Nothing to do. */ |