Fix crash when reading mtllib command

Neptilo · web-flow · commit 7712f1bebdc8 · 2019-01-04T13:57:34.000+01:00
The code was assuming the mtllib command to be near the beginning of the file, and therefore to always be read by the first thread.
diff --git a/experimental/tinyobj_loader_opt.h b/experimental/tinyobj_loader_opt.h
@@ -1414,8 +1414,9 @@ bool parseObj(attrib_t *attrib, std::vector<shape_t> *shapes,
             }
 
             if (command.type == COMMAND_MTLLIB) {
+              // Save the indices of the `mtllib` command in `commands` to easily find it later
               mtllib_t_index = t;
-              mtllib_i_index = commands->size();
+              mtllib_i_index = commands[t].size();
             }
 
             commands[t].emplace_back(std::move(command));

Original file line number	Diff line number	Diff line change
`@@ -1414,8 +1414,9 @@ bool parseObj(attrib_t attrib, std::vector<shape_t> shapes,`
`1414`	`1414`	`}`
`1415`	`1415`
`1416`	`1416`	`if (command.type == COMMAND_MTLLIB) {`
	`1417`	+ // Save the indices of the `mtllib` command in `commands` to easily find it later
`1417`	`1418`	`mtllib_t_index = t;`
`1418`		`- mtllib_i_index = commands->size();`
	`1419`	`+ mtllib_i_index = commands[t].size();`
`1419`	`1420`	`}`
`1420`	`1421`
`1421`	`1422`	`commands[t].emplace_back(std::move(command));`