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' ); if ( extension === null ) { for ( let i = 0; i < drawCount; i ++ ) { this.render( starts[ i ], counts[ i ] ); } } else { 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 };