OpenGL 与 GLSL 版本号
2017-05-11 10:02
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来自:https://github.com/mattdesl/lwjgl-basics/wiki/GLSL-Versions
You can use the
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.
Vertex shader:
You can initialize uniforms in a shader, and the value will be set at link time:
Integers are implicitly converted to floats when necessary, for example:
New built-ins:
Fragment output can be user-defined
Input and output is declared with
You can use the
#versioncommand 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 |
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+,inand
outare used instead of
attributeand
varying. GLSL 330+ includes other features like layout qualifiers and changes
texture2Dto
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
constvalue
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 120You can use
fto define a float:
float f = 2.5f;
GLSL 130 Additions
intand
uintsupport (and bitwise operations with them)
switchstatement support
New built-ins:
trunc(),
round(),
roundEven(),
isnan(),
isinf(),
modf()
Fragment output can be user-defined
Input and output is declared with
inand
outsyntax instead of
attributeand
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_locationextension
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