fragment shader

基本解釋

Inorder to program Cg vertex and fragment shaders, it is important to understandthe input and ouput of each shader.
為了對頂點和片段著色器進行編程，理解每個著色器的輸入和輸出是很重要的。
The output from a fragment shader is a list of colors for each of the color buffers being written to, a depth value, and a stencil value.
片段著色器的輸出結(jié)果是深度值、模板值和即將寫入顏色緩存的顏色值。
Rendering without a fragment shader is useful when rendering only a primitive's default depth information to the depth buffer, such as when performing Occlusion Query tests.
當你只需要將圖元的深度信息寫入深度緩存時（例如在施展遮擋查詢測試時），不使用片段著色器的渲染過程就很有用。