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/**
* @author mrdoob / http://mrdoob.com/
*/
function WebGLIndexedBufferRenderer( gl, extensions, info, capabilities ) {
var isWebGL2 = capabilities.isWebGL2;
var mode;
function setMode( value ) {
mode = value;
}
var 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 );
}
function renderInstances( geometry, start, count, primcount ) {
if ( primcount === 0 ) return;
var 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 };