#memoryless

Zeus had been in Omnipotence City arguing how much of threat his own father was to not only the Olympians but the entire world as a whole. He was just talking with Odin when he sensed something and it made him steer his attention and his attitude suddenly shifted and he apologized but it seemed a matter had arisen and he had to leave immediately, he disappeared and reappeared in the mess of a huge battle, the destruction was appalling, he would have to work double time to repair the damage, the mortals were tenacious but even they worked at a slow pace. Looking around he saw a Titan, but...it was dead. Titans were the leftovers from the war with his father, incredibly strong and even more dangerous, and he made it quite clear to his children that under no circumstance should they challenge a Titan by themselves, then he saw a sight that made him worry, a very bloodied Diana but she looked lost and that was even more troublesome, he saw her stumble a bit and he was over there in seconds. 

Shader는 왜 어려운가?

 병렬연산은 GPU가 빠른 일처리를 가능하게 하는 장점이기도 하지만, 프로그래머의 입장에서, 그 코딩이 상당히 까다로워지는 주된 요인이 되기도 한다.

1. Blind 

GPU의 병렬 파이프라인들은 개개인마다 독립적이다. 쉽게말해, 현재 픽셀에서 처리되는 결과물은 바로 옆픽셀에서 전혀 알길이 없다. 

이렇게 Blind한 속성을 지닌 병렬연산에서, 오직 자신의 위치좌표만을 참조하여 타 픽셀과의 차이를 만들어가야 하기때문에, 코딩하기가 어렵다.

2. Memoryless

GLSL은 메모리의 특정 주소로 접근하고, 값을 빼오는 일이 어렵다.(잘은 모르지만 CUDA의 경우는 이것이 가능하여 상당히 효율적으로 병렬연산을 처리할 수 있다고 들었다.)

그래서 개인적으로, GLSL코딩은 마치 매 프레임마다 값이 새로 생성되는 지역변수만을 가지고 그림을 그리는것과 같은 느낌을 받았다.