tr_model_iqm: parallel IQM model loading

Author: illwieckz

src/engine/renderer/tr_model_iqm.cpp

@@ -33,6 +33,7 @@ Maryland 20850 USA.
 */
 
 #include "tr_local.h"
+#include "framework/Omp.h"
 #include "GeometryOptimiser.h"
 
 /* Flags -O2, -O3 and -0s produce SIGBUS in R_LoadIQModel() on armhf,
@@ -833,12 +834,15 @@ bool R_LoadIQModel( model_t *mod, const void *buffer, int filesize,
 		i16vec4_t *qtangentbuf = static_cast<i16vec4_t *>(
 			ri.Hunk_AllocateTempMemory( sizeof( i16vec4_t ) * IQModel->num_vertexes ) );
 
-		for(int i = 0; i < IQModel->num_vertexes; i++ ) {
+		auto task = [&]( const size_t& i ) -> void
+		{
 			R_TBNtoQtangents( &IQModel->tangents[ 3 * i ],
 					  &IQModel->bitangents[ 3 * i ],
 					  &IQModel->normals[ 3 * i ],
 					  qtangentbuf[ i ] );
-		}
+		};
+
+		Omp::Tasker( task, IQModel->num_vertexes );
 
 		const vertexAttributeSpec_t attrs[] {
 			{ ATTR_INDEX_BONE_FACTORS, GL_UNSIGNED_SHORT, GL_UNSIGNED_SHORT, boneFactorBuf, 4, sizeof( u16vec4_t ), 0 },