function WebGLIndexedBufferRenderer( gl, extensions, info, capabilities ) { const isWebGL2 = capabilities.isWebGL2; let mode; function setMode( value ) { mode = value; } let type, bytesPerElement; function setIndex( value ) { type = value.type; bytesPerElement = value.bytesPerElement; } function render( start, count ) { gl.drawElements( mode, count, type, start * bytesPerElement ); info.update( count, mode, 1 ); } function renderInstances( start, count, primcount ) { if ( primcount === 0 ) return; let extension, methodName; if ( isWebGL2 ) { extension = gl; methodName = 'drawElementsInstanced'; } else { extension = extensions.get( 'ANGLE_instanced_arrays' ); methodName = 'drawElementsInstancedANGLE'; if ( extension === null ) { console.error( 'THREE.WebGLIndexedBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' ); return; } } extension[ methodName ]( mode, count, type, start * bytesPerElement, primcount ); info.update( count, mode, primcount ); } // this.setMode = setMode; this.setIndex = setIndex; this.render = render; this.renderInstances = renderInstances; } export { WebGLIndexedBufferRenderer };