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v/vlib/glm/glm.v
2019-08-07 09:53:33 +02:00

323 lines
6.2 KiB
Go

// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module glm
import math
/*
#flag -lmyglm
# f32* myglm_ortho(f32, f32, f32, f32);
# f32* myglm_translate(f32, f32, f32);
*/
// # f32* myglm_rotate(f32 *m, f32 angle, f32, f32, f32);
// # f32* myglm_perspective(f32, f32, f32, f32);
// # f32* myglm_look_at(glm__Vec3, glm__Vec3, glm__Vec3);
// # glm__Vec3 myglm_mult(glm__Vec3, glm__Vec3);
// # glm__Vec3 myglm_cross(glm__Vec3, glm__Vec3);
// # glm__Vec3 myglm_normalize(glm__Vec3);
struct Mat4 {
pub:
data *f32
}
struct Vec2 {
x f32
y f32
}
struct Vec3 {
x f32
y f32
z f32
}
pub fn vec3(x, y, z f32) Vec3 {
res := Vec3 {
x: x,
y: y,
z: z,
}
return res
}
fn mat4(f *f32) Mat4 {
res := Mat4 {
data: f
}
return res
}
fn (v Vec3) str() string {
return 'Vec3{ $v.x, $v.y, $v.z }'
}
fn (v Vec2) str() string {
return 'Vec3{ $v.x, $v.y }'
}
fn (m Mat4) str() string {
mut s := '[ '
for i := 0; i < 4; i++ {
if i != 0 {
s += ' '
}
for j := 0; j < 4; j++ {
val := m.data[i * 4 + j]
s += '${val:.2f} '
}
if i != 3 {
s += '\n'
}
}
s += ']'
return s
}
fn vec2(x, y int) Vec2 {
res := Vec2 {
x: x,
y: y,
}
return res
}
fn (a Vec3) add(b Vec3) Vec3 {
res := Vec3 {
x: a.x + b.x,
y: a.y + b.y,
z: a.z + b.z,
}
return res
}
fn (a Vec3) sub(b Vec3) Vec3 {
res := Vec3 {
x: a.x - b.x,
y: a.y - b.y,
z: a.z - b.z,
}
return res
}
// fn (a Vec3) mult(b Vec3) Vec3 {
// # return myglm_mult(a,b);
// }
fn (a Vec3) mult_scalar(b f32) Vec3 {
res := Vec3 {
x: a.x * b,
y: a.y * b,
z: a.z * b,
}
return res
}
fn (a Vec3) print() {
x := a.x
y := a.y
z := a.z
C.printf('vec3{%f,%f,%f}\n',x,y,z)
// println('vec3{$x,$y,$z}')
}
/*
fn rotate(m Mat4, angle f32, vec Vec3) Mat4 {
// # t_mat4 m;
// println('rotate done')
# return glm__mat4( myglm_rotate(m.data, angle, vec.x,vec.y,vec.z) );
return Mat4{}
}
*/
fn f32_calloc(n int) *f32 {
return *f32(calloc(n * sizeof(f32)))
}
// fn translate(vec Vec3) *f32 {
pub fn translate(m Mat4, v Vec3) Mat4 {
// # return glm__mat4(myglm_translate(vec.x,vec.y,vec.z) );
a := m.data
mut out := f32_calloc(16)
x := v.x
y := v.y
z := v.z
a00 := a[0]a01 := a[1]a02 := a[2]a03 := a[3]
a10 := a[4]a11 := a[5]a12 := a[6]a13 := a[7]
a20 := a[8]a21 := a[9]a22 := a[10]a23 := a[11]
out[0] = a00 out[1] = a01 out[2] = a02 out[3] = a03
out[4] = a10 out[5] = a11 out[6] = a12 out[7] = a13
out[8] = a20 out[9] = a21 out[10] = a22 out[11] = a23
out[12] = a00 * x + a10 * y + a20 * z + a[12]
out[13] = a01 * x + a11 * y + a21 * z + a[13]
out[14] = a02 * x + a12 * y + a22 * z + a[14]
out[15] = a03 * x + a13 * y + a23 * z + a[15]
return mat4(out)
}
/*
fn normalize(vec Vec3) Vec3 {
# return myglm_normalize(vec);
return Vec3{}
}
*/
// https://github.com/g-truc/glm/blob/0ceb2b755fb155d593854aefe3e45d416ce153a4/glm/ext/matrix_clip_space.inl
pub fn ortho(left, right, bottom, top f32) Mat4 {
//println('glm ortho($left, $right, $bottom, $top)')
// mat<4, 4, T, defaultp> Result(static_cast<T>(1));
n := 16
mut res := f32_calloc(n)
res[0] = 2.0 / f32(right - left)
res[5] = 2.0 / f32(top - bottom)
res[10] = 1.0
res[12] = - (right + left) / (right - left)
res[13] = - (top + bottom) / (top - bottom)
res[15] = 1.0
return mat4(res)
}
// fn scale(a *f32, v Vec3) *f32 {
pub fn scale(m Mat4, v Vec3) Mat4 {
a := m.data
mut out := f32_calloc(16)
x := v.x
y := v.y
z := v.z
out[0] = a[0] * v.x
out[1] = a[1] * x
out[2] = a[2] * x
out[3] = a[3] * x
out[4] = a[4] * y
out[5] = a[5] * y
out[6] = a[6] * y
out[7] = a[7] * y
out[8] = a[8] * z
out[9] = a[9] * z
out[10] = a[10] * z
out[11] = a[11] * z
out[12] = a[12]
out[13] = a[13]
out[14] = a[14]
out[15] = a[15]
return mat4(out)
}
// fn rotate_z(a *f32, rad f32) *f32 {
pub fn rotate_z(m Mat4, rad f32) Mat4 {
a := m.data
mut out := f32_calloc(16)
s := math.sin(rad)
c := math.cos(rad)
a00 := a[0]
a01 := a[1]
a02 := a[2]
a03 := a[3]
a10 := a[4]
a11 := a[5]
a12 := a[6]
a13 := a[7]
out[8] = a[8]
out[9] = a[9]
out[10] = a[10]
out[11] = a[11]
out[12] = a[12]
out[13] = a[13]
out[14] = a[14]
out[15] = a[15]
// Perform axis-specific matrix multiplication
out[0] = a00 * c + a10 * s
out[1] = a01 * c + a11 * s
out[2] = a02 * c + a12 * s
out[3] = a03 * c + a13 * s
out[4] = a10 * c - a00 * s
out[5] = a11 * c - a01 * s
out[6] = a12 * c - a02 * s
out[7] = a13 * c - a03 * s
return mat4(out)
}
pub fn identity() Mat4 {
// 1 0 0 0
// 0 1 0 0
// 0 0 1 0
// 0 0 0 1
n := 16
mut res := f32_calloc(sizeof(f32) * n)
res[0] = 1
res[5] = 1
res[10] = 1
res[15] = 1
return mat4(res)
}
// returns *f32 without allocation
pub fn identity2(res mut *f32) {
res[0] = 1
res[5] = 1
res[10] = 1
res[15] = 1
// # f32 f[16]={0};// for (int i =0;i<16;i++)
// # printf("!!%d\n", f[0]);
// # glm__identity2(&f);
// # gl__Shader_set_mat4(shader, tos2("projection"), f) ;
}
pub fn identity3() []f32 {
res := [1.0, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
] !
return res
}
// https://github.com/toji/gl-matrix/blob/1549cf21dfa14a2bc845993485343d519cf064fe/src/gl-matrix/mat4.js
fn ortho_js(left, right, bottom, top f32) *f32 {
mynear := 1
myfar := 1
lr := 1.0 / (left - right)
bt := 1.0 / (bottom - top)
nf := 1.0 / 1.0// (mynear -myfar)
mut out := (*f32)( malloc (sizeof(f32) * 16))
out[0] = -2.0 * lr
out[1] = 0
out[2] = 0
out[3] = 0
out[4] = 0
out[5] = -2.0 * bt
out[6] = 0
out[7] = 0
out[8] = 0
out[9] = 0
out[10] = 2.0 * nf
out[11] = 0
out[12] = (left + right) * lr
out[13] = (top + bottom) * bt
out[14] = 1.0 * nf//(far + near) * nf;
out[15] = 1
return out
//f := 0.0
//return &f
}
// fn ortho_old(a, b, c, d f32) *f32 {
// # return myglm_ortho(a,b,c,d);
// }
fn cross(a, b Vec3) Vec3 {
// # return myglm_cross(a,b);
return Vec3{}
}
/*
fn perspective(degrees f32, ratio f32, a, b f32) Mat4 {
// println('lang per degrees=$degrees ratio=$ratio a=$a b=$b')
// # printf("lang pers degrees=%f ratio=%f a=%f b=%f\n", degrees, ratio, a,b);
# return glm__mat4( myglm_perspective(degrees, ratio, a,b) ) ;
return Mat4{}
}
fn look_at(eye, center, up Vec3) Mat4 {
# return glm__mat4( myglm_look_at(eye, center, up) ) ;
return Mat4{}
}
*/