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