镶嵌着色器-OpenGL [英] Tessellation Shader - OpenGL

问题描述

layout (vertices = 3) out;

void main(void)
{
    if (gl_InvocationID == 0)
    {
        gl_TessLevelInner[0] = 5.0;
        gl_TessLevelOuter[0] = 5.0;
        gl_TessLevelOuter[1] = 5.0;
        gl_TessLevelOuter[2] = 5.0;
    }
    gl_out[gl_InvocationID].gl_Position = gl_in[gl_InvocationID].gl_Position;
}

节选自:尼古拉斯·海梅尔. "OpenGL SuperBible:

Excerpt From: Haemel, Nicholas. "OpenGL SuperBible:

我如何理解TessLevelInner和Outer，为什么ID 0被列出两次?

How can i understand TessLevelInner and Outer and why is the id 0 listed two times?

推荐答案

我如何理解gl_TessLevelInner和gl_TessLevelOuter?

请参阅: gl_TessLevelInner ，顾名思义，它们控制要处理的图元的内部和外部镶嵌因子级别.下图显示了各种内部/外部级别设置的结果.

As their names imply, they control the inner and outer tessellation factor levels for the primitive being processed. Below is an image illustrating the results of various inner/outer level settings.

来源: http://antongerdelan.net/opengl/tessellation.html

为什么索引0被使用两次?

它被使用两次，因为它正在访问两个不同的对象.索引0的首次使用是

It is used twice because it is accessing two different objects. The first use of index 0 is with

gl_TessLevelInner[0]

第二个是

gl_TessLevelOuter[0]

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