Arithmetic

矩阵基本的运算

mat2 m = mat2(1, 2,
              3, 4);
mat2 w = mat2(7, 8,
              9, 10);

//Component wise addition
mat2 h = m + w;

//Now: h = mat2(8,  10,
//              12, 14)

//Scalar multiplication
mat2 j = 2.0 * m;
//Now: j = mat2(2, 4,
//              6, 8)

Instead, the * operator has the effect of multiplying matrices and transforming vectors:

mat2 m = mat2(1, 2,
3, 4);

vec2 v = m * vec2(1, 2); //v = vec2(7, 10)

//In GLSL, switching order of arguments is equivalent
//to transposing:
vec2 u = vec2(1, 2) * m; //u = vec2(5, 11)