1

OpenGL Considerations

CuriousTorvald edited this page 2023-03-02 14:16:33 +09:00

Table of Contents

• GL Versions
• GLSL Versions

GL Versions

GL Version 3.2 is forced

Because of the limited OpenGL support of macOS, we change the ingame target GL version to 3.2; this includes the GLSL shader version (which is 1.50)

The modules that creates Lwjgl3ApplicationConfiguration must add following option to the app config:

appConfig = new Lwjgl3ApplicationConfiguration();
appConfig.setOpenGLEmulation(Lwjgl3ApplicationConfiguration.GLEmulation.GL30, 3, 2);
...

GLSL Versions

GLSL Version 1.50 is forced

Every GLSL code must start with following line:

#version 150
...

and as this change brings significant syntax change, following replacement conventions also apply:

Vertex Shaders

old	new
attribute <type> <identifier>	in <type> <identifier>
varying <type> <identifier>	out <type> <identifier>

Fragment Shaders

old	new
varying <type> <identifier>	in <type> <identifier>
gl_FragColor = ...	out vec4 fragColor; fragColor = ...