112 lines
3.3 KiB
JavaScript
112 lines
3.3 KiB
JavaScript
define([
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'../Core/BoundingRectangle',
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'../Core/defined',
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'../Core/defineProperties',
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'../Core/destroyObject',
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'../Core/PixelFormat',
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'../Renderer/Framebuffer',
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'../Renderer/PixelDatatype',
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'../Renderer/RenderState',
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'../Renderer/Sampler',
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'../Renderer/Texture',
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'../Renderer/TextureMagnificationFilter',
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'../Renderer/TextureMinificationFilter',
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'../Renderer/TextureWrap',
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'../Shaders/BrdfLutGeneratorFS'
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], function(
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BoundingRectangle,
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defined,
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defineProperties,
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destroyObject,
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PixelFormat,
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Framebuffer,
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PixelDatatype,
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RenderState,
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Sampler,
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Texture,
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TextureMagnificationFilter,
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TextureMinificationFilter,
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TextureWrap,
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BrdfLutGeneratorFS) {
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'use strict';
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/**
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* @private
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*/
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function BrdfLutGenerator() {
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this._framebuffer = undefined;
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this._colorTexture = undefined;
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this._drawCommand = undefined;
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}
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defineProperties(BrdfLutGenerator.prototype, {
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colorTexture : {
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get : function() {
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return this._colorTexture;
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}
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}
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});
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function createCommand(generator, context) {
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var framebuffer = generator._framebuffer;
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var drawCommand = context.createViewportQuadCommand(BrdfLutGeneratorFS, {
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framebuffer : framebuffer,
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renderState : RenderState.fromCache({
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viewport : new BoundingRectangle(0.0, 0.0, 256.0, 256.0)
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})
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});
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generator._drawCommand = drawCommand;
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}
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function createFramebuffer(generator, context) {
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var colorTexture = new Texture({
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context : context,
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width : 256,
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height: 256,
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pixelFormat : PixelFormat.RGBA,
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pixelDatatype : PixelDatatype.UNSIGNED_BYTE,
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sampler : new Sampler({
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wrapS : TextureWrap.CLAMP_TO_EDGE,
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wrapT : TextureWrap.CLAMP_TO_EDGE,
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minificationFilter : TextureMinificationFilter.NEAREST,
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magnificationFilter : TextureMagnificationFilter.NEAREST
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})
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});
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generator._colorTexture = colorTexture;
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var framebuffer = new Framebuffer({
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context : context,
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colorTextures : [colorTexture],
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destroyAttachments : false
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});
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generator._framebuffer = framebuffer;
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}
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BrdfLutGenerator.prototype.update = function(frameState) {
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if (!defined(this._colorTexture)) {
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var context = frameState.context;
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createFramebuffer(this, context);
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createCommand(this, context);
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this._drawCommand.execute(context);
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this._framebuffer = this._framebuffer && this._framebuffer.destroy();
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this._drawCommand.shaderProgram = this._drawCommand.shaderProgram && this._drawCommand.shaderProgram.destroy();
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}
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};
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BrdfLutGenerator.prototype.isDestroyed = function() {
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return false;
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};
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BrdfLutGenerator.prototype.destroy = function() {
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this._colorTexture = this._colorTexture && this._colorTexture.destroy();
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return destroyObject(this);
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};
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return BrdfLutGenerator;
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});
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