javascript
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three.js
zrkadlo https://github.com/tazdij/three.js.git


			
				
					
						
						
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		<h1>[name]</h1>

		<p class="desc">Uniforms 是 [link:https://www.opengl.org/documentation/glsl/ GLSL] 着色器中的全局变量。
		</p>

		<h2>代码示例</h2>
		<p>
			When declaring a uniform of a [page:ShaderMaterial], it is declared by value or by object.
		</p>
		<code>
		uniforms: {
			time: { value: 1.0 },
			resolution: new Uniform( new Vector2() )
		};
		</code>

		<h2>Uniform 种类</h2>

		<p>
			每个 Uniform 必须包括一个 *value* 属性。value 的类型必须和下表中 GLSL 的基本类型相对应。同样，Uniform 的结构体和队列
			也是支持的。 GLSL基本类型队列必须要么被显示声明为一个 THREE 对象的队列，要么被声明为一个包含所有对象数据的队列。这就是说，
			队列中的 GLSL 基础类型不能再是一个队列。举例，一个有 5 个 *vec2* 元素的队列，必须是一个包含 5 个 [page:Vector2] 的队列数组，
			或包含 10 个 *number* 的队列。

		</p>
		<table>
			<caption><a id="uniform-types">Uniform 类型</a></caption>
			<thead>
				<tr>
					<th>GLSL 类型</th>
					<th>JavaScript 类型</th>
				</tr>
			</thead>
			<tbody>

				<tr>
					<td>int</td>
					<td>[page:Number]</td>
				</tr>
				<tr>
					<td>uint (WebGL 2)</td>
					<td>[page:Number]</td>
				</tr>
				<tr>
					<td>float</td>
					<td>[page:Number]</td>
				</tr>
				<tr>
					<td>bool</td>
					<td>[page:Boolean]</td>
				</tr>
				<tr>
					<td>bool</td>
					<td>[page:Number]</td>
				</tr>

				<tr>
					<td>vec2</td>
					<td>[page:Vector2 THREE.Vector2]</td>
				</tr>
				<tr>
					<td>vec2</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>vec2</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>vec3</td>
					<td>[page:Vector3 THREE.Vector3]</td>
				</tr>
				<tr>
					<td>vec3</td>
					<td>[page:Color THREE.Color]</td>
				</tr>
				<tr>
					<td>vec3</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>vec3</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>vec4</td>
					<td>[page:Vector4 THREE.Vector4]</td>
				</tr>
				<tr>
					<td>vec4</td>
					<td>[page:Quaternion THREE.Quaternion]</td>
				</tr>
				<tr>
					<td>vec4</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>vec4</td>
					<td>[page:Array Array] (*)</td>
				</tr>

				<tr>
					<td>mat2</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>mat2</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>mat3</td>
					<td>[page:Matrix3 THREE.Matrix3]</td>
				</tr>
				<tr>
					<td>mat3</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>mat3</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>mat4</td>
					<td>[page:Matrix3 THREE.Matrix4]</td>
				</tr>
				<tr>
					<td>mat4</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>mat4</td>
					<td>[page:Array Array] (*)</td>
				</tr>

				<tr>
					<td>ivec2, bvec2</td>
					<td>[page:Float32Array Float32Array] (*)</td>
				</tr>
				<tr>
					<td>ivec2, bvec2</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>ivec3, bvec3</td>
					<td>[page:Int32Array Int32Array] (*)</td>
				</tr>
				<tr>
					<td>ivec3, bvec3</td>
					<td>[page:Array Array] (*)</td>
				</tr>
				<tr>
					<td>ivec4, bvec4</td>
					<td>[page:Int32Array Int32Array] (*)</td>
				</tr>
				<tr>
					<td>ivec4, bvec4</td>
					<td>[page:Array Array] (*)</td>
				</tr>

				<tr>
					<td>sampler2D</td>
					<td>[page:Texture THREE.Texture]</td>
				</tr>
				<tr>
					<td>samplerCube</td>
					<td>[page:CubeTexture THREE.CubeTexture]</td>
				</tr>

			</tbody>
		</table>

		<p>
		(*) 与最内层队列中 GSLS 的类型保持一致。包含队列中所有矢量的元素或矩阵中的元素。
		</p>

		<h2>Structured Uniforms</h2>

		<p>
			Sometimes you want to organize uniforms as *structs* in your shader code. The following style must be used so *three.js* is able
			to process structured uniform data.
		</p>
		<code>
		uniforms = {
			data: {
				value: {
					position: new Vector3(),
					direction: new Vector3( 0, 0, 1 )
				 }
			}
		};
		</code>
		This definition can be mapped on the following GLSL code:
		<code>
		struct Data {
			vec3 position;
			vec3 direction;
		};

		uniform Data data;
		</code>

		<h2>Structured Uniforms with Arrays</h2>

		<p>
			It's also possible to manage *structs* in arrays. The syntax for this use case looks like so:
		</p>
		<code>
		var entry1 = {
			position: new Vector3(),
			direction: new Vector3( 0, 0, 1 )
		};
		var entry2 = {
			position: new Vector3( 1, 1, 1 ),
			direction: new Vector3( 0, 1, 0 )
		};

		uniforms = {
			data: {
				value: [ entry1, entry2 ]
			}
		};
		</code>
		This definition can be mapped on the following GLSL code:
		<code>
		struct Data {
			vec3 position;
			vec3 direction;
		};

		uniform Data data[ 2 ];
		</code>

		<h2>构造函数</h2>

		<h3>[name]( [param:Object value] )</h3>
		<p>
		value -- 包含需要设置 Uniform 数据的对象。 数据类型必须是上述类型中的一种。
		</p>

		<h2>属性</h2>

		<h3>[property:Object value]</h3>
		<p>
			当前 uniform 的值。
		</p>

		<h2>方法</h2>

		<h3>[method:Uniform clone]()</h3>
		<p>
			返回该 Uniform 的克隆。<br />
			如果 Uniform 的 value 属性是一个带 clone() 方法的 [page:Object]，则克隆该对象时，value 的 clone() 方法也会被调用，否则克隆时只会使用赋值语句。
			队列中的值会在该 Uniform 和 被克隆对象间共享。
		</p>

		<h2>源代码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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