---------------------------------------------------Qt3D ShaderProgrameQt3D GLSL 渲染器Shader示例可参考：    http://blog.csdn.net/candycat1992/article/details/44039077    https://www.shadertoy.com/http://blog.csdn.net/candycat1992/article/details/44039077faq: shader的输入参数怎么各家都不一样，到底是如何定义的---------------------------------------------------概念    渲染代码可由ShaderProgram对象封装    参数的传递比ShaderEffect复杂得多，好麻烦    要求输出的参数是一致的（gl_Position, gl_FragColor)    Qt3D默认提供的参数    attribute highp vec4 vertexPosition;   // 顶点位置    attribute highp vec3 vertexNormal;     // 顶点法线    attribute highp vec2 vertexTexCoord;   // 顶点纹理坐标    uniform highp mat4 mvp;                // ？    uniform highp mat4 modelMatrix;        // ?    uniform highp vec3 cameraPosition;     // 相机位置    uniform mat4 modelView;                // ?    uniform mat4 modelNormalMatrix;        // ?常用的方法   normalize   dot   min/mix/max/pow/   textureCube    highp vec4 surface = texture2D(surfaceTexture, texCoord);    highp vec3 reflectedDirection = reflect(viewDirection, normalize(normal));    textureCube(skyboxTexture, reflectedDirection).rgbVertexShader    // Qt 3D默认提供的参数      attribute vec3 vertexPosition;      attribute vec3 vertexNormal;      uniform mat4 modelView;      uniform mat4 modelNormalMatrix;      uniform mat4 mvp;      // 自己提供的参数      uniform vec3 lightPosition;      varying vec3 reflectVec;      varying vec3 viewVec;      varying float NdotL;      void main( void )      {          vec3 ecPos = ( modelView * vec4( vertexPosition, 1.0 ) ).xyz;          vec3 normal = normalize( modelNormalMatrix * vec4( vertexNormal, 1.0 ) ).xyz;          vec3 lightVec = normalize( lightPosition - ecPos );          reflectVec = normalize( reflect( -lightVec, normal ) );          viewVec = normalize( -ecPos );          NdotL = ( dot( lightVec, normal ) + 1.0 ) * 0.5;          gl_Position = mvp * vec4( vertexPosition, 1.0 );      }  FragmentShader    // 自己提供的参数      uniform vec3 surfaceColor;      uniform vec3 warmColor;      uniform vec3 coolColor;      uniform float diffuseWarm;      uniform float diffuseCool;      varying vec3 reflectVec;      varying vec3 viewVec;      varying float NdotL;      void main( void )      {          vec3 kcool    = min( coolColor + diffuseCool * surfaceColor, 1.0 );          vec3 kwarm    = min( warmColor + diffuseWarm * surfaceColor, 1.0 );          vec3 kfinal   = mix( kcool, kwarm, NdotL );          float spec = max( dot( reflectVec, viewVec ), 0.0 );          spec = pow( spec, 32.0 );          gl_FragColor = vec4( min( kfinal + spec, 1.0 ), 1.0 );      }    cinematic3d/BackgroundCubeMap.qml        ShaderProgram {        id: gles2SkyboxShader        vertexShaderCode: "            attribute vec3 vertexPosition;            varying vec3 texCoord0;            uniform mat4 mvp;            void main()            {                texCoord0 = vertexPosition.xyz;                gl_Position = vec4(mvp * vec4(vertexPosition, 1.0)).xyww; // Fail depth test always against any rendered pixel            }            "        fragmentShaderCode: "            varying highp vec3 texCoord0;            uniform samplerCube skyboxTexture;            void main()            {                gl_FragColor = textureCube(skyboxTexture, texCoord0);            }            "    }    // 二维贴图材质Texture2D {    property alias source: image.source    minificationFilter: Texture.LinearMipMapLinear    magnificationFilter: Texture.Linear    generateMipMaps: true    wrapMode {        x: WrapMode.ClampToEdge        y: WrapMode.ClampToEdge    }    TextureImage {id: image}}