Created
June 18, 2017 17:51
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///matrix_ortho(x,y, width,height, znear,zfar) | |
// Thanks, mesa! | |
// Source from src/mesa/math/m_matrix.c:1019 | |
// Modified according to the formula at the bottom of | |
// https://msdn.microsoft.com/en-us/library/windows/desktop/bb205347(v=vs.85).aspx | |
var _x,_y,w,h; | |
_x = argument0; | |
_y = argument1; | |
w = argument2; | |
h = argument3; | |
var m, left, right, bottom, top, nearval, farval; | |
left = _x-w/2; | |
right = _x+w/2; | |
bottom = _y+h/2; | |
top = _y-h/2; | |
nearval = argument4; | |
farval = argument5; | |
// #define M(row,col) m[col*4+row] | |
m[0 + 4*0] = 2.0 / (right-left); | |
m[0 + 4*1] = 0.0; | |
m[0 + 4*2] = 0.0; | |
m[0 + 4*3] = (left+right) / (left-right); | |
m[1 + 4*0] = 0.0; | |
m[1 + 4*1] = 2.0 / (top-bottom); | |
m[1 + 4*2] = 0.0; | |
m[1 + 4*3] = (top+bottom) / (bottom-top); | |
m[2 + 4*0] = 0.0; | |
m[2 + 4*1] = 0.0; | |
m[2 + 4*2] = 1 / (farval-nearval); | |
m[2 + 4*3] = nearval / (nearval-farval); | |
m[3 + 4*0] = 0.0; | |
m[3 + 4*1] = 0.0; | |
m[3 + 4*2] = 0.0; | |
m[3 + 4*3] = 1.0; | |
return m; |
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