WebGLProgram
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2023-12-01
发送到顶点着色器和片元着色器的GLSL程序的构造函数, 包含默认的变量(uniforms)和属性
内置的变量(uniforms)和属性
顶点着色器(无条件的):
// = object.matrixWorld uniform mat4 modelMatrix; // = camera.matrixWorldInverse * object.matrixWorld uniform mat4 modelViewMatrix; // = camera.projectionMatrix uniform mat4 projectionMatrix; // = camera.matrixWorldInverse uniform mat4 viewMatrix; // = inverse transpose of modelViewMatrix uniform mat3 normalMatrix; // = camera position in world space uniform vec3 cameraPosition;
// default vertex attributes provided by Geometry and BufferGeometry attribute vec3 position; attribute vec3 normal; attribute vec2 uv;
注意,可以通过以下方式计算顶点着色器中顶点的位置:
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );或者也可以这样:
gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4( position, 1.0 );
顶点着色器(有条件的):
#if defined( USE_COLOR_ALPHA ) // vertex color attribute with alpha attribute vec4 color; #elif defined( USE_COLOR ) // vertex color attribute attribute vec3 color; #endif
#ifdef USE_MORPHTARGETS attribute vec3 morphTarget0; attribute vec3 morphTarget1; attribute vec3 morphTarget2; attribute vec3 morphTarget3; #ifdef USE_MORPHNORMALS attribute vec3 morphNormal0; attribute vec3 morphNormal1; attribute vec3 morphNormal2; attribute vec3 morphNormal3; #else attribute vec3 morphTarget4; attribute vec3 morphTarget5; attribute vec3 morphTarget6; attribute vec3 morphTarget7; #endif #endif
#ifdef USE_SKINNING attribute vec4 skinIndex; attribute vec4 skinWeight; #endif
片元着色器:
uniform mat4 viewMatrix; uniform vec3 cameraPosition;
构造器
WebGLProgram( renderer : WebGLRenderer, cacheKey : String, parameters : Object )
参数详见WebGLRenderer.
属性
.name : String
The name of the respective shader program.
.id : String
The identifier of this instance.
.cacheKey : String
This key enables the reusability of a single WebGLProgram for different materials.
.usedTimes : Integer
How many times this instance is used for rendering render items.
.program : Object
The actual shader program.
.vertexShader : WebGLShader
An instance of WebGLShader representing the vertex shader.
.fragmentShader : WebGLShader
An instance of WebGLShader representing the frament shader.
方法
.getUniforms () : Object
返回所有活动态的变量(uniform)位置的name-value映射
.getAttributes () : Object
返回所有活动态的顶点属性位置的name-value映射
.destroy () : null
Destroys an instance of WebGLProgram.