变量和数据类型
//布尔类型. true,false;
bool bDone = false;
//整形数据类型
int iValue = 42;
//无符号整型
uint uiValue = 3929u;
//浮点型
float fValue = 3.14159f
向量数据类型
//声明向量：4分量的float类型
vec4 V1;
//声明并对向量进行构造
vec4 V2 = vec4(1,2,3,4);
//向量运算，赋值/加/标量相乘
vec4 v;
vec4 vOldPos = vec4(1,2,3,4);
vec4 vOffset = vec4(1,2,3,4);
v = vOldPos + vOffset;
v = vNewPos;
v += vec4(10,10,10,10);
v = vOldPos * vOffset;
v *= 5;
//向量中元素获取和赋值：xyz
v1.x = 3.0f
v1.xy = vec2(3.0f,4.0f);
v1.xyz = vec3(3,0f,4,0f,5.0f);
//通过rgba赋值
v1.r = 3.0f;
v1.rgba = vec4(1.0f,1.0f,1.0f,1.0f);
//通过纹理坐标赋值
v1.st = vec2(1.0f,0.0f);
//错误：混值赋值
v1.st = v2.xt; //不可以
v1.st = v2.xy; //可以，不建议
//多个元素交换
v1.rgba = v2.bgra;
v2.bgra = v1.rgba;
//单个之间赋值
v1.r = v2.b;
v1.g = v2.g;
v1.b = v2.r;
v1.a = v2.a;
//单个之间赋值
v1.x = vOtherVerex.x +5.0f;
v1.y = vOtherVerex.y +4.0f;
v1.z = vOtherVerex.z +3.0f;
v1.xyz = vOtherVerex.xyz + vec3(5.0f,4.0f,3.0f);
矩阵
//创建
mat4 m1,m2,m3;
//运算构造
/// 单位矩阵
mat4 m2 = mat4(1.0f,0.0f,0.0f,0.0f
0.0f,1.0f,0.0f,0.0f,
0.0f,0.0f,1.0f,0.0f,
0.0f,0.0f,0.0f,1.0f);
mat4 m4 = mat4(1.0f);
/// 构造
mat4 m3 = mat4(0.5,0.5,0.5,0.5,
0.5,0.5,0.5,0.5,
0.5,0.5,0.5,0.5,
0.5,0.5,0.5,0.5)
m1 = m2 * m3;
数组
float floatArray[4];
vec4 vecArray[2];
float a[4] = float[](1.0,2.0,3.0,4.0);
vec2 c[2] = vec2[2](vec2(1.0,2.0),vec2(3.0,4.0));
结构体：
struct myStruct{
vec4 color;
float start;
float end;
}fogVar;
fogVar = myStruct(vec4(1.0,0.0,0.0,1.0),0.5,2.0);
vec4 color = fogVar.color;
float start = fogVar.start;
函数:不允许递归
定义函数的3个修饰符
in:默认修饰符，传入韩式中，函数不能对其进行修改
inout:可以进行修改
out : 函数返回值，可以进行修改
//常量
Const float zero = 0.0;
vec4 myFunc(inout float myfloa,out vec4 m1, mat4 m2){
}
vec4 diffuse(vec3 normal ,vec3 light, vec4 baseColor)
{
return baseColor * dot(normal,light);
}