three/src/renderers/webgl/WebGLBufferRenderer.js

JavaScript 3D library

function WebGLBufferRenderer( gl, extensions, info ) {

	let mode;

	function setMode( value ) {

		mode = value;

	}

	function render( start, count ) {

		gl.drawArrays( mode, start, count );

		info.update( count, mode, 1 );

	}

	function renderInstances( start, count, primcount ) {

		if ( primcount === 0 ) return;

		gl.drawArraysInstanced( mode, start, count, primcount );

		info.update( count, mode, primcount );

	}

	function renderMultiDraw( starts, counts, drawCount ) {

		if ( drawCount === 0 ) return;

		const extension = extensions.get( 'WEBGL_multi_draw' );
		extension.multiDrawArraysWEBGL( mode, starts, 0, counts, 0, drawCount );

		let elementCount = 0;
		for ( let i = 0; i < drawCount; i ++ ) {

			elementCount += counts[ i ];

		}

		info.update( elementCount, mode, 1 );

	}

	//

	this.setMode = setMode;
	this.render = render;
	this.renderInstances = renderInstances;
	this.renderMultiDraw = renderMultiDraw;

}


export { WebGLBufferRenderer };