skybox_fs.c

static const char* skybox_fs = "#version 330 core\n"
"\n"
"out vec4 FragColor;\n"
"\n"
"in vec3 TexCoords;\n"
"\n"
"uniform samplerCube skybox;\n"
"\n"
"void main()\n"
"{\n"
"  FragColor = texture(skybox, TexCoords);\n"
"}\n"
;