Aggregate Operations and Constructors - OpenGL ES 2.0 / GLSL 1.0

Matrix Constructor Examples [5.4]

mat2(float)                        // init diagonal
mat2(vec2, vec2);                  // column-major order
mat2(float, float, float, float);  // column-major order

Structure Constructor Example [5.4.3]

struct light {float intensity; vec3 pos; };
light lightVar = light(3.0, vec3(1.0, 2.0, 3.0));

Matrix Components [5.6]

Access components of a matrix with array subscripting syntax.
For example:

mat4 m;             // m represents a matrix
m[1] = vec4(2.0);   // sets second column to all 2.0
m[0][0] = 1.0;      // sets upper left element to 1.0
m[2][3] = 2.0;      // sets 4th element of 3rd column to 2.0

Examples of operations on matrices and vectors:

m = f * m;                // scalar * matrix component-wise
v = f * v;                // scalar * vector component-wise
v = v * v;                // vector * vector component-wise
m = m +/- m;              // matrix component-wise addition/subtraction
m = m * m;                // linear algebraic multiply
m = v * m;                // row vector * matrix linear algebraic multiply
m = m * v;                // matrix * column vector linear algebraic multiply
f = dot(v, v);            // vector dot product
v = cross(v, v);          // vector cross product
m = matrixCompMult(m, m); // component-wise multiply

Structure Operations [5.7]

Select structure fields using the period (.) operator. Other operators include:

.	field selector
== !=	equality
=	assignment

Array Operations [4.1.9]

Array elements are accessed using the array subscript
operator “[ ]”. For example:

diffuseColor += lightIntensity[3] * NdotL;