first commit

public/sdk/three/jsm/renderers/webgl/WebGLBufferRenderer.js

@@ -0,0 +1,145 @@
+class WebGLBufferRenderer {
+
+	constructor( backend ) {
+
+		this.gl = backend.gl;
+		this.extensions = backend.extensions;
+		this.info = backend.renderer.info;
+		this.mode = null;
+		this.index = 0;
+		this.type = null;
+		this.object = null;
+
+	}
+
+	render( start, count ) {
+
+		const { gl, mode, object, type, info, index } = this;
+
+		if ( index !== 0 ) {
+
+			gl.drawElements( mode, count, type, start );
+
+		} else {
+
+			gl.drawArrays( mode, start, count );
+
+		}
+
+		info.update( object, count, mode, 1 );
+
+	}
+
+	renderInstances( start, count, primcount ) {
+
+		const { gl, mode, type, index, object, info } = this;
+
+		if ( primcount === 0 ) return;
+
+		if ( index !== 0 ) {
+
+			gl.drawElementsInstanced( mode, count, type, start, primcount );
+
+		} else {
+
+			gl.drawArraysInstanced( mode, start, count, primcount );
+
+		}
+
+		info.update( object, count, mode, primcount );
+
+	}
+
+	renderMultiDraw( starts, counts, drawCount ) {
+
+		const { extensions, mode, object, info } = this;
+
+		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 {
+
+			if ( this.index !== 0 ) {
+
+				extension.multiDrawElementsWEBGL( mode, counts, 0, this.type, starts, 0, drawCount );
+
+			} else {
+
+				extension.multiDrawArraysWEBGL( mode, starts, 0, counts, 0, drawCount );
+
+			}
+
+			let elementCount = 0;
+			for ( let i = 0; i < drawCount; i ++ ) {
+
+				elementCount += counts[ i ];
+
+			}
+
+			info.update( object, elementCount, mode, 1 );
+
+		}
+
+	}
+
+	renderMultiDrawInstances( starts, counts, drawCount, primcount ) {
+
+		const { extensions, mode, object, info } = this;
+
+		if ( drawCount === 0 ) return;
+
+		const extension = extensions.get( 'WEBGL_multi_draw' );
+
+		if ( extension === null ) {
+
+			for ( let i = 0; i < drawCount; i ++ ) {
+
+				this.renderInstances( starts[ i ], counts[ i ], primcount[ i ] );
+
+			}
+
+		} else {
+
+			if ( this.index !== 0 ) {
+
+				extension.multiDrawElementsInstancedWEBGL( mode, counts, 0, this.type, starts, 0, primcount, 0, drawCount );
+
+			} else {
+
+				extension.multiDrawArraysInstancedWEBGL( mode, starts, 0, counts, 0, primcount, 0, drawCount );
+
+			}
+
+			let elementCount = 0;
+
+			for ( let i = 0; i < drawCount; i ++ ) {
+
+				elementCount += counts[ i ];
+
+			}
+
+			for ( let i = 0; i < primcount.length; i ++ ) {
+
+				info.update( object, elementCount, mode, primcount[ i ] );
+
+			}
+
+		}
+
+	}
+
+	//
+
+}
+
+
+export { WebGLBufferRenderer };