void HexagonMirrorApp::drawInstanced( const gl::VboMesh &vbo, size_t instanceCount )
{
if( vbo.getNumIndices() > 0 )
drawRangeInstanced( vbo, (size_t)0, vbo.getNumIndices(), instanceCount );
else
drawArraysInstanced( vbo, 0, vbo.getNumVertices(), instanceCount );
}
void HexagonMirrorApp::drawRangeInstanced( const gl::VboMesh &vbo, size_t startIndex, size_t indexCount, size_t instanceCount )
{
if( vbo.getNumIndices() <= 0 )
return;
vbo.enableClientStates();
vbo.bindAllData();
#if( defined GLEE_ARB_draw_instanced )
glDrawElementsInstancedARB( vbo.getPrimitiveType(), indexCount, GL_UNSIGNED_INT, (GLvoid*)( sizeof(uint32_t) * startIndex ), instanceCount );
#elif( defined GLEE_EXT_draw_instanced )
glDrawElementsInstancedEXT( vbo.getPrimitiveType(), indexCount, GL_UNSIGNED_INT, (GLvoid*)( sizeof(uint32_t) * startIndex ), instanceCount );
#else
// fall back to rendering a single instance
glDrawElements( vbo.getPrimitiveType(), indexCount, GL_UNSIGNED_INT, (GLvoid*)( sizeof(uint32_t) * startIndex ) );
#endif
gl::VboMesh::unbindBuffers();
vbo.disableClientStates();
}