| function WebGLBufferRenderer( gl, extensions, info, capabilities ) { |
|
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| const isWebGL2 = capabilities.isWebGL2; |
|
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| let mode; |
|
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| function setMode( value ) { |
|
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| mode = value; |
|
|
| } |
|
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| function render( start, count ) { |
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| gl.drawArrays( mode, start, count ); |
|
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| info.update( count, mode, 1 ); |
|
|
| } |
|
|
| function renderInstances( start, count, primcount ) { |
|
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| if ( primcount === 0 ) return; |
|
|
| let extension, methodName; |
|
|
| if ( isWebGL2 ) { |
|
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| extension = gl; |
| methodName = 'drawArraysInstanced'; |
|
|
| } else { |
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| extension = extensions.get( 'ANGLE_instanced_arrays' ); |
| methodName = 'drawArraysInstancedANGLE'; |
|
|
| if ( extension === null ) { |
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| console.error( 'THREE.WebGLBufferRenderer: using THREE.InstancedBufferGeometry but hardware does not support extension ANGLE_instanced_arrays.' ); |
| return; |
|
|
| } |
|
|
| } |
|
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| extension[ methodName ]( mode, start, count, primcount ); |
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| info.update( count, mode, primcount ); |
|
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| } |
|
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| function renderMultiDraw( starts, counts, drawCount ) { |
|
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| if ( drawCount === 0 ) return; |
|
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| const extension = extensions.get( 'WEBGL_multi_draw' ); |
| if ( extension === null ) { |
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| for ( let i = 0; i < drawCount; i ++ ) { |
|
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| this.render( starts[ i ], counts[ i ] ); |
|
|
| } |
|
|
| } else { |
|
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| extension.multiDrawArraysWEBGL( mode, starts, 0, counts, 0, drawCount ); |
|
|
| let elementCount = 0; |
| for ( let i = 0; i < drawCount; i ++ ) { |
|
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| elementCount += counts[ i ]; |
|
|
| } |
|
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| info.update( elementCount, mode, 1 ); |
|
|
| } |
|
|
| } |
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| |
|
|
| this.setMode = setMode; |
| this.render = render; |
| this.renderInstances = renderInstances; |
| this.renderMultiDraw = renderMultiDraw; |
|
|
| } |
|
|
|
|
| export { WebGLBufferRenderer }; |
|
|
