分析一下这段代码： 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 * diffuse; }
这段代码是一个shader程序，它使用了varying变量uv作为纹理坐标，uniform变量current_color和texture_0作为当前颜色和纹理，然后对每个像素进行处理。 在main函数中，首先从纹理texture_0中获取对应uv坐标的颜色值diffuse。然后，根据条件编译指令#ifdef alpha_test进行alpha测试，如果diffuse的alpha值小于0.5，则放弃这个像素。将current_color和diffuse相乘得到最终颜色，并赋值给内置的gl_fragcolor变量。 总体来说，这段代码的作用是根据纹理和颜色来计算每个像素的最终颜色，并在满足条件的情况下进行alpha测试。 [2024-10-20 09:29:24 | AI写代码神器 | 331点数解答]
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