几何着色器

#version 430
layout(triangles) in;           //输入图元类型
layout(triangle_strip，max_vertices = 256) out;      //输出图元类型

/*---------------------内置输入变量---------------------
in int gl_PrimitiveIDIn;    //图元索引
in gl_PerVertex
{
vec4 gl_Position;
float gl_PointSize;
float gl_ClipDistance[];
} gl_in[];
-----------------------------------------------------*/

/*---------------------内置输出变量---------------------
out int gl_PrimitiveID;
out vec4 gl_Position;
out float gl_PointSize;
out float gl_ClipDistance[];
-----------------------------------------------------*/

//自定义输入
in vec2 uvInGS;

//自定义输出
out vec2 uvInFS;

void main()
{
for each primitive
{
for each vertex
{
gl_Position = ...
uvInFS = ...
EmitVertex();   //为当前图元添加一个顶点
}
EndPrimitive();     //结束当前图元
}
}