分析一下这段 opengl vertex的代码： // __multiversion__ // this signals the loading code to prepend either #version 100 or #version 300 es as apropriate. // to use centroid sampling we need to have version 300 es shaders, which requires changing: // attribute to in // varying to out when in vertex shaders or in when in fragment shaders // defining an out vec4 fragcolor and replacing uses of gl_fragcolor with fragcolor // texture2d to texture #if __version__ >= 300 #define attribute in #define varying out
这段代码主要是处理不同版本的 OpenGL 着色器代码的兼容性。 `__multiversion__` 指令通常用于指示加载代码根据情况在前面添加适当的 `#version 100` 或 `#version 300 es` 版本声明。 对于版本 300 es 的着色器，有一些特定的更改要求： - 将 `attribute` 改为 `in` ，用于在顶点着色器中定义输入变量。 - 将 `varying` 改为 `out` （在顶点着色器中）或 `in` （在片段着色器中），用于在不同着色器阶段之间传递变量。 通过条件编译指令 `#if __version__ >= 300` 来根据版本号决定是否应用这些更改，以确保代码在不同版本的 OpenGL ES 中能够正确编译和运行。 [2024-10-19 19:43:44 | AI写代码神器 | 191点数解答]
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