[GLSL] Variables | 逍遙文工作室

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[GLSL] Variables

2011 年 07 月 10 日

vertex shader和pixel shader可以使用的變數型態有些差異，從字面意義來記憶比較實際。

Variables

Declaring and using variables in GLSL is similar to using variables in C.

There are four options for variable qualifiers:

const – A constant.

varying – Read-only in a fragment shader, readable/writable in the vertex shader. Used to communicate between the two shaders.

uniform – Global read-only variables available to vertex and fragment shaders which can’t be changed inside glBegin() and glEnd() calls.

attribute – Global read-only variables only available to the vertex shader (and not the fragment shader). Passed from an OpenGL program, these can be changed on a per vertex level.

參考：Tutorials » GLSL 1.2 Tutorial » Data Types and Variables 。

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