分析一下这段代码： // version 300 code #ifdef msaa_framebuffer_enabled #define _centroid centroid #else #define _centroid #endif _centroid in vec2 uv; #define varying in #define texture2d texture out vec4 fragcolor; #define gl_fragcolor fragcolor #else // version 100 code varying vec2 uv; #endif uniform vec4 current_color; uniform sampler2d texture_0; void main() { vec4 diffuse = texture2d( texture_0, uv ); #ifdef alpha_test if(diffuse.a < 0.5) discard; #endif gl_fragcolor = current_color
这段代码是一个针对不同版本的着色器代码的处理逻辑。根据不同的条件，使用不同的宏和变量赋值来生成适应不同版本的着色器代码。 首先，根据预定义的宏`msaa_framebuffer_enabled`的值，决定`_centroid`的定义。如果`msaa_framebuffer_enabled`被定义，那么`_centroid`被定义为`centroid`；否则，`_centroid`被定义为空字符串。 然后，根据预定义的宏`msaa_framebuffer_enabled`的值，决定`in vec2 uv`的定义。如果`msaa_framebuffer_enabled`被定义，那么`uv`被定义为`_centroid`；否则，`uv`被定义为空字符串。 接着，根据预定义的宏`msaa_framebuffer_enabled`的值，决定其他的宏和变量的定义。如果`msaa_framebuffer_enabled`被定义，那么`varying`被定义为`in`，`texture2d`被定义为`texture`，`out vec4 fragcolor`被定义为`gl_fragcolor`。如果`msaa_framebuffer_enabled`未被定义，那么没有这些宏和变量的定义。 根据预定义的宏`alpha_test`的值，决定是否进行片段丢弃判定。如果`alpha_test`被定义，且`diffuse.a`小于0.5，那么执行`discard`操作丢弃当前片段。无论是否进行了片段丢弃，最后将`current_color`赋值给`gl_fragcolor`。 总体来说，这段代码是根据不同版本的条件进行了宏定义和变量赋值，并进行了片段丢弃判定，最后将颜色值赋给`gl_fragcolor`。 [2024-10-20 09:28:34 | AI写代码神器 | 741点数解答]
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