remove glm swizzling for better debugability

engine/util.h

@@ -19,6 +19,14 @@ glm::vec3 convert_rgb2hsv(const glm::vec3 c);
 size_t curl_data_handler(void *contents, size_t size, size_t nmemb, void *userp);
 size_t curl_data_write(void *ptr, size_t size, size_t nmemb, FILE *stream);
 void check_OpenGLError(const char* stmt, const char* fname, int line);
+inline glm::vec2 xy(const glm::vec4& v) { return glm::vec2(v.x, v.y); }
+inline glm::vec3 xyz(const glm::vec4& v) { return glm::vec3(v.x, v.y, v.z); }
+inline glm::vec2 zw(const glm::vec4& v) { return glm::vec2(v.z, v.w); }
+inline glm::ivec2 xy(const glm::ivec4& v) { return glm::ivec2(v.x, v.y); }
+inline glm::ivec3 xyz(const glm::ivec4& v) { return glm::ivec3(v.x, v.y, v.z); }
+inline glm::ivec2 zw(const glm::ivec4& v) { return glm::ivec2(v.z, v.w); }
+
+inline glm::vec2 xy(const glm::vec3& v) { return glm::vec2(v.x, v.y); }
 
 template<typename T, int N> struct cbuffer
 {