diff --git a/openglgeometrybank.cpp b/openglgeometrybank.cpp
index 89692b57..c1a7ca0a 100644
--- a/openglgeometrybank.cpp
+++ b/openglgeometrybank.cpp
@@ -75,9 +75,6 @@ opengl_vbogeometrybank::draw_( gfx::geometry_handle const &Geometry, gfx::stream
             chunk.vertices.data() );
         chunkrecord.is_good = true;
     }
-    if( m_activestreams != Streams ) {
-        bind_streams( Units, Streams );
-    }
     // ...render...
     if( chunkrecord.index_count > 0 ) {
 /*
@@ -86,13 +83,28 @@ opengl_vbogeometrybank::draw_( gfx::geometry_handle const &Geometry, gfx::stream
             chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
             chunkrecord.vertex_offset );
 */
-        ::glDrawRangeElementsBaseVertex(
-            chunk.type,
-            0, chunkrecord.vertex_count,
-            chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
-            chunkrecord.vertex_offset );
+        if (GLAD_GL_VERSION_3_2 || GLAD_GL_ARB_draw_elements_base_vertex) {
+            if( m_activestreams != Streams ) {
+                bind_streams( Units, Streams );
+            }
+            ::glDrawRangeElementsBaseVertex(
+                chunk.type,
+                0, chunkrecord.vertex_count,
+                chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ),
+                chunkrecord.vertex_offset );
+        }
+        else {
+            bind_streams( Units, Streams, chunkrecord.vertex_offset );
+            ::glDrawRangeElements(
+                chunk.type,
+                0, chunkrecord.vertex_count,
+                chunkrecord.index_count, GL_UNSIGNED_INT, reinterpret_cast<void const *>( chunkrecord.index_offset * sizeof( gfx::basic_index ) ) );
+        }
     }
     else {
+        if( m_activestreams != Streams ) {
+            bind_streams( Units, Streams );
+        }
         ::glDrawArrays( chunk.type, chunkrecord.vertex_offset, chunkrecord.vertex_count );
     }
     // ...post-render cleanup
@@ -211,10 +223,10 @@ opengl_vbogeometrybank::delete_buffer() {
 }
 
 void
-opengl_vbogeometrybank::bind_streams( gfx::stream_units const &Units, unsigned int const Streams ) {
+opengl_vbogeometrybank::bind_streams( gfx::stream_units const &Units, unsigned int const Streams, size_t offset ) {
 
     if( Streams & gfx::stream::position ) {
-        ::glVertexPointer( 3, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 0 ) );
+        ::glVertexPointer( 3, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( sizeof( gfx::basic_vertex ) * offset ) );
         ::glEnableClientState( GL_VERTEX_ARRAY );
     }
     else {
@@ -222,14 +234,14 @@ opengl_vbogeometrybank::bind_streams( gfx::stream_units const &Units, unsigned i
     }
     // NOTE: normal and color streams share the data, making them effectively mutually exclusive
     if( Streams & gfx::stream::normal ) {
-        ::glNormalPointer( GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 12 ) );
+        ::glNormalPointer( GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 12 + sizeof( gfx::basic_vertex ) * offset ) );
         ::glEnableClientState( GL_NORMAL_ARRAY );
     }
     else {
         ::glDisableClientState( GL_NORMAL_ARRAY );
     }
     if( Streams & gfx::stream::color ) {
-        ::glColorPointer( 3, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 12 ) );
+        ::glColorPointer( 3, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 12 + sizeof( gfx::basic_vertex ) * offset ) );
         ::glEnableClientState( GL_COLOR_ARRAY );
     }
     else {
@@ -238,7 +250,7 @@ opengl_vbogeometrybank::bind_streams( gfx::stream_units const &Units, unsigned i
     if( Streams & gfx::stream::texture ) {
         for( auto unit : Units.texture ) {
             ::glClientActiveTexture( GL_TEXTURE0 + unit );
-            ::glTexCoordPointer( 2, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 24 ) );
+            ::glTexCoordPointer( 2, GL_FLOAT, sizeof( gfx::basic_vertex ), reinterpret_cast<void const *>( 24 + sizeof( gfx::basic_vertex ) * offset ) );
             ::glEnableClientState( GL_TEXTURE_COORD_ARRAY );
         }
         m_activetexturearrays = Units.texture;
diff --git a/openglgeometrybank.h b/openglgeometrybank.h
index 53843f55..7e1d243c 100644
--- a/openglgeometrybank.h
+++ b/openglgeometrybank.h
@@ -63,7 +63,7 @@ private:
         delete_buffer();
     static
     void
-        bind_streams( gfx::stream_units const &Units, unsigned int const Streams );
+        bind_streams(gfx::stream_units const &Units, unsigned int const Streams , size_t offset = 0);
     static
     void
         release_streams();
@@ -121,4 +121,4 @@ private:
 
 };
 
-} // namespace gfx
\ No newline at end of file
+} // namespace gfx
diff --git a/ref/glad/include/glad/glad.h b/ref/glad/include/glad/glad.h
index 6c80e5ec..5f7d0308 100644
--- a/ref/glad/include/glad/glad.h
+++ b/ref/glad/include/glad/glad.h
@@ -1,6 +1,6 @@
 /*
 
-    OpenGL, OpenGL ES loader generated by glad 0.1.34 on Wed Jan 20 19:37:38 2021.
+    OpenGL, OpenGL ES loader generated by glad 0.1.34 on Fri Jan 22 22:11:52 2021.
 
     Language/Generator: C/C++
     Specification: gl
@@ -9,6 +9,7 @@
     Extensions:
         GL_ARB_clip_control,
         GL_ARB_direct_state_access,
+        GL_ARB_draw_elements_base_vertex,
         GL_ARB_multi_bind,
         GL_ARB_texture_filter_anisotropic,
         GL_EXT_clip_control,
@@ -26,9 +27,9 @@
     Reproducible: False
 
     Commandline:
-        --profile="compatibility" --api="gl=3.3,gles2=3.2" --generator="c" --spec="gl" --no-loader --extensions="GL_ARB_clip_control,GL_ARB_direct_state_access,GL_ARB_multi_bind,GL_ARB_texture_filter_anisotropic,GL_EXT_clip_control,GL_EXT_framebuffer_object,GL_EXT_geometry_shader,GL_EXT_texture_compression_s3tc,GL_EXT_texture_filter_anisotropic,GL_EXT_texture_sRGB,GL_GREMEDY_string_marker,GL_KHR_debug,GL_OES_draw_elements_base_vertex"
+        --profile="compatibility" --api="gl=3.3,gles2=3.2" --generator="c" --spec="gl" --no-loader --extensions="GL_ARB_clip_control,GL_ARB_direct_state_access,GL_ARB_draw_elements_base_vertex,GL_ARB_multi_bind,GL_ARB_texture_filter_anisotropic,GL_EXT_clip_control,GL_EXT_framebuffer_object,GL_EXT_geometry_shader,GL_EXT_texture_compression_s3tc,GL_EXT_texture_filter_anisotropic,GL_EXT_texture_sRGB,GL_GREMEDY_string_marker,GL_KHR_debug,GL_OES_draw_elements_base_vertex"
     Online:
-        https://glad.dav1d.de/#profile=compatibility&language=c&specification=gl&api=gl%3D3.3&api=gles2%3D3.2&extensions=GL_ARB_clip_control&extensions=GL_ARB_direct_state_access&extensions=GL_ARB_multi_bind&extensions=GL_ARB_texture_filter_anisotropic&extensions=GL_EXT_clip_control&extensions=GL_EXT_framebuffer_object&extensions=GL_EXT_geometry_shader&extensions=GL_EXT_texture_compression_s3tc&extensions=GL_EXT_texture_filter_anisotropic&extensions=GL_EXT_texture_sRGB&extensions=GL_GREMEDY_string_marker&extensions=GL_KHR_debug&extensions=GL_OES_draw_elements_base_vertex
+        https://glad.dav1d.de/#profile=compatibility&language=c&specification=gl&api=gl%3D3.3&api=gles2%3D3.2&extensions=GL_ARB_clip_control&extensions=GL_ARB_direct_state_access&extensions=GL_ARB_draw_elements_base_vertex&extensions=GL_ARB_multi_bind&extensions=GL_ARB_texture_filter_anisotropic&extensions=GL_EXT_clip_control&extensions=GL_EXT_framebuffer_object&extensions=GL_EXT_geometry_shader&extensions=GL_EXT_texture_compression_s3tc&extensions=GL_EXT_texture_filter_anisotropic&extensions=GL_EXT_texture_sRGB&extensions=GL_GREMEDY_string_marker&extensions=GL_KHR_debug&extensions=GL_OES_draw_elements_base_vertex
 */
 
 
@@ -4774,6 +4775,10 @@ typedef void (APIENTRYP PFNGLGETQUERYBUFFEROBJECTUIVPROC)(GLuint id, GLuint buff
 GLAPI PFNGLGETQUERYBUFFEROBJECTUIVPROC glad_glGetQueryBufferObjectuiv;
 #define glGetQueryBufferObjectuiv glad_glGetQueryBufferObjectuiv
 #endif
+#ifndef GL_ARB_draw_elements_base_vertex
+#define GL_ARB_draw_elements_base_vertex 1
+GLAPI int GLAD_GL_ARB_draw_elements_base_vertex;
+#endif
 #ifndef GL_ARB_multi_bind
 #define GL_ARB_multi_bind 1
 GLAPI int GLAD_GL_ARB_multi_bind;
diff --git a/ref/glad/src/glad.c b/ref/glad/src/glad.c
index b0e9bde2..37e97449 100644
--- a/ref/glad/src/glad.c
+++ b/ref/glad/src/glad.c
@@ -1,6 +1,6 @@
 /*
 
-    OpenGL, OpenGL ES loader generated by glad 0.1.34 on Wed Jan 20 19:37:38 2021.
+    OpenGL, OpenGL ES loader generated by glad 0.1.34 on Fri Jan 22 22:11:52 2021.
 
     Language/Generator: C/C++
     Specification: gl
@@ -9,6 +9,7 @@
     Extensions:
         GL_ARB_clip_control,
         GL_ARB_direct_state_access,
+        GL_ARB_draw_elements_base_vertex,
         GL_ARB_multi_bind,
         GL_ARB_texture_filter_anisotropic,
         GL_EXT_clip_control,
@@ -26,9 +27,9 @@
     Reproducible: False
 
     Commandline:
-        --profile="compatibility" --api="gl=3.3,gles2=3.2" --generator="c" --spec="gl" --no-loader --extensions="GL_ARB_clip_control,GL_ARB_direct_state_access,GL_ARB_multi_bind,GL_ARB_texture_filter_anisotropic,GL_EXT_clip_control,GL_EXT_framebuffer_object,GL_EXT_geometry_shader,GL_EXT_texture_compression_s3tc,GL_EXT_texture_filter_anisotropic,GL_EXT_texture_sRGB,GL_GREMEDY_string_marker,GL_KHR_debug,GL_OES_draw_elements_base_vertex"
+        --profile="compatibility" --api="gl=3.3,gles2=3.2" --generator="c" --spec="gl" --no-loader --extensions="GL_ARB_clip_control,GL_ARB_direct_state_access,GL_ARB_draw_elements_base_vertex,GL_ARB_multi_bind,GL_ARB_texture_filter_anisotropic,GL_EXT_clip_control,GL_EXT_framebuffer_object,GL_EXT_geometry_shader,GL_EXT_texture_compression_s3tc,GL_EXT_texture_filter_anisotropic,GL_EXT_texture_sRGB,GL_GREMEDY_string_marker,GL_KHR_debug,GL_OES_draw_elements_base_vertex"
     Online:
-        https://glad.dav1d.de/#profile=compatibility&language=c&specification=gl&api=gl%3D3.3&api=gles2%3D3.2&extensions=GL_ARB_clip_control&extensions=GL_ARB_direct_state_access&extensions=GL_ARB_multi_bind&extensions=GL_ARB_texture_filter_anisotropic&extensions=GL_EXT_clip_control&extensions=GL_EXT_framebuffer_object&extensions=GL_EXT_geometry_shader&extensions=GL_EXT_texture_compression_s3tc&extensions=GL_EXT_texture_filter_anisotropic&extensions=GL_EXT_texture_sRGB&extensions=GL_GREMEDY_string_marker&extensions=GL_KHR_debug&extensions=GL_OES_draw_elements_base_vertex
+        https://glad.dav1d.de/#profile=compatibility&language=c&specification=gl&api=gl%3D3.3&api=gles2%3D3.2&extensions=GL_ARB_clip_control&extensions=GL_ARB_direct_state_access&extensions=GL_ARB_draw_elements_base_vertex&extensions=GL_ARB_multi_bind&extensions=GL_ARB_texture_filter_anisotropic&extensions=GL_EXT_clip_control&extensions=GL_EXT_framebuffer_object&extensions=GL_EXT_geometry_shader&extensions=GL_EXT_texture_compression_s3tc&extensions=GL_EXT_texture_filter_anisotropic&extensions=GL_EXT_texture_sRGB&extensions=GL_GREMEDY_string_marker&extensions=GL_KHR_debug&extensions=GL_OES_draw_elements_base_vertex
 */
 
 #include <stdio.h>
@@ -985,6 +986,7 @@ PFNGLWINDOWPOS3SPROC glad_glWindowPos3s = NULL;
 PFNGLWINDOWPOS3SVPROC glad_glWindowPos3sv = NULL;
 int GLAD_GL_ARB_clip_control = 0;
 int GLAD_GL_ARB_direct_state_access = 0;
+int GLAD_GL_ARB_draw_elements_base_vertex = 0;
 int GLAD_GL_ARB_multi_bind = 0;
 int GLAD_GL_ARB_texture_filter_anisotropic = 0;
 int GLAD_GL_EXT_clip_control = 0;
@@ -2002,6 +2004,13 @@ static void load_GL_ARB_direct_state_access(GLADloadproc load) {
 	glad_glGetQueryBufferObjectui64v = (PFNGLGETQUERYBUFFEROBJECTUI64VPROC)load("glGetQueryBufferObjectui64v");
 	glad_glGetQueryBufferObjectuiv = (PFNGLGETQUERYBUFFEROBJECTUIVPROC)load("glGetQueryBufferObjectuiv");
 }
+static void load_GL_ARB_draw_elements_base_vertex(GLADloadproc load) {
+	if(!GLAD_GL_ARB_draw_elements_base_vertex) return;
+	glad_glDrawElementsBaseVertex = (PFNGLDRAWELEMENTSBASEVERTEXPROC)load("glDrawElementsBaseVertex");
+	glad_glDrawRangeElementsBaseVertex = (PFNGLDRAWRANGEELEMENTSBASEVERTEXPROC)load("glDrawRangeElementsBaseVertex");
+	glad_glDrawElementsInstancedBaseVertex = (PFNGLDRAWELEMENTSINSTANCEDBASEVERTEXPROC)load("glDrawElementsInstancedBaseVertex");
+	glad_glMultiDrawElementsBaseVertex = (PFNGLMULTIDRAWELEMENTSBASEVERTEXPROC)load("glMultiDrawElementsBaseVertex");
+}
 static void load_GL_ARB_multi_bind(GLADloadproc load) {
 	if(!GLAD_GL_ARB_multi_bind) return;
 	glad_glBindBuffersBase = (PFNGLBINDBUFFERSBASEPROC)load("glBindBuffersBase");
@@ -2064,6 +2073,7 @@ static int find_extensionsGL(void) {
 	if (!get_exts()) return 0;
 	GLAD_GL_ARB_clip_control = has_ext("GL_ARB_clip_control");
 	GLAD_GL_ARB_direct_state_access = has_ext("GL_ARB_direct_state_access");
+	GLAD_GL_ARB_draw_elements_base_vertex = has_ext("GL_ARB_draw_elements_base_vertex");
 	GLAD_GL_ARB_multi_bind = has_ext("GL_ARB_multi_bind");
 	GLAD_GL_ARB_texture_filter_anisotropic = has_ext("GL_ARB_texture_filter_anisotropic");
 	GLAD_GL_EXT_framebuffer_object = has_ext("GL_EXT_framebuffer_object");
@@ -2152,6 +2162,7 @@ int gladLoadGLLoader(GLADloadproc load) {
 	if (!find_extensionsGL()) return 0;
 	load_GL_ARB_clip_control(load);
 	load_GL_ARB_direct_state_access(load);
+	load_GL_ARB_draw_elements_base_vertex(load);
 	load_GL_ARB_multi_bind(load);
 	load_GL_EXT_framebuffer_object(load);
 	load_GL_GREMEDY_string_marker(load);