zoukankan      html  css  js  c++  java
  • GLSL Versions和GLSL ES Versions 对比

    You can use the #version command as the first line of your shader to specify GLSL version:

    #version 120
    
    void main() {
        gl_FragColor = vec4(1.0);
    }

    GLSL versions are released alongside GL versions. See the following charts to decide which version you would like to target.

    GLSL Versions

    OpenGL Version GLSL Version
    2.0 110
    2.1 120
    3.0 130
    3.1 140
    3.2 150
    3.3 330
    4.0 400
    4.1 410
    4.2 420
    4.3 430

    GLSL ES Versions (Android, iOS, WebGL)

    OpenGL ES has its own Shading Language, and the versioning starts fresh. It is based on OpenGL Shading Language version 1.10.

    OpenGL ES Version GLSL ES Version
    2.0 100
    3.0 300

    So, for example, if a feature is available in GLSL 120, it probably won't be available in GLSL ES 100 unless the ES compiler specifically allows it.

    Differences at a Glance

    Differences between (desktop) GLSL versions.

    Version 100

    Vertex shader:

    uniform mat4 projTrans;
    
    attribute vec2 Position;
    attribute vec2 TexCoord;
    
    varying vec2 vTexCoord;
    
    void main() {
        vTexCoord = TexCoord;
        gl_Position = u_projView * vec4(Position, 0.0, 1.0);
    }

    Fragment shader:

    uniform sampler2D tex0;
    
    varying vec2 vTexCoord;
    
    void main() {
        vec4 color = texture2D(tex0, vTexCoord);
        gl_FragColor = color;
    }

    Version 330

    As of GLSL 130+, in and out are used instead of attribute and varying. GLSL 330+ includes other features like layout qualifiers and changes texture2D to texture.

    Vertex shader:

    #version 330
    
    uniform mat4 projTrans;
    
    layout(location = 0) in vec2 Position;
    layout(location = 1) in vec2 TexCoord;
    
    out vec2 vTexCoord;
    
    void main() {
        vTexCoord = TexCoord;
        gl_Position = u_projView * vec4(Position, 0, 1);
    }

    Fragment shader:

    #version 330
    uniform sampler2D tex0;
    
    in vec2 vTexCoord;
    
    //use your own output instead of gl_FragColor 
    out vec4 fragColor;
    
    void main() {
        //'texture' instead of 'texture2D'
        fragColor = texture(tex0, vTexCoord);
    }

    Other Significant Changes

    GLSL 120 Additions

    • You can initialize arrays within a shader, like so:
    float a[5] = float[5](3.4, 4.2, 5.0, 5.2, 1.1);
    float b[5] = float[](3.4, 4.2, 5.0, 5.2, 1.1);

    However, the above is not supported on Mac OSX Snow Leopard, even with GLSL 120. (1)

    • You can initialize uniforms in a shader, and the value will be set at link time:
    uniform float val = 1.0;
    • You can use built-ins like sin() when setting a const value
    • Integers are implicitly converted to floats when necessary, for example:
    float f = 1.0; <-- valid
    float g = 1; <-- only supported in GLSL 120
    vec2 v = vec2(1, 2.0); <-- only supported in GLSL 120
    • You can use f to define a float: float f = 2.5f;

    GLSL 130 Additions

    • int and uint support (and bitwise operations with them)
    • switch statement support
    • New built-ins: trunc(), round(), roundEven(), isnan(), isinf(), modf()
    • Fragment output can be user-defined
    • Input and output is declared with in and out syntax instead of attribute and varying

    GLSL 150 Additions

    • texture() should now be used instead of texture2D()

    GLSL 330 Additions

    • Layout qualifiers can declare the location of vertex shader inputs and fragment shader outputs, eg:
    layout(location = 2) in vec3 values[4];

    Formally this was only possible with ARB_explicit_attrib_location extension

  • 相关阅读:
    ToolbarLayout的使用
    设置NavigationView子布局Menu图片的颜色
    设置RecyclerView显示滚动条(这里演示垂直的滚动条,水平的道理一样)
    在使用ToolBar + AppBarLayout,实现上划隐藏Toolbar功能,遇到了一个坑。
    Android中设置Imageview的图片充满整个布局
    Android透明状态栏设置
    关于NavigationView中item的字体颜色和icon选中状态颜色
    dp、sp 、 px之间的相互转化的工具类
    今天使用JNI时,出现了一个错误:java.lang.UnsatisfiedLinkError : dlopen failed: library //dlopen打开失败
    kubernetes的几个概念
  • 原文地址:https://www.cnblogs.com/beeasy/p/6339313.html
Copyright © 2011-2022 走看看