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shapes.odin
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package example
WHITE :: rgba{255, 255, 255, 255}
GRAY_0 :: rgba{200, 200, 200, 255}
GRAY_1 :: rgba{160, 160, 160, 255}
GRAY_2 :: rgba{120, 120, 120, 255}
GRAY_3 :: rgba{ 80, 80, 80, 255}
GRAY_4 :: rgba{ 40, 40, 40, 255}
GRAY :: GRAY_3
BLACK :: rgba{ 0, 0, 0, 255}
GREEN :: rgba{ 60, 210, 0, 255}
YELLOW :: rgba{210, 200, 0, 255}
BLUE :: rgba{ 0, 80, 190, 255}
CYAN :: rgba{ 0, 210, 210, 255}
RED :: rgba{230, 20, 0, 255}
ORANGE :: rgba{250, 150, 50, 255}
PURPLE :: rgba{160, 100, 200, 255}
PURPLE_DARK :: rgba{ 80, 30, 30, 255}
TRANSPARENT :: rgba{ 0, 0, 0, 0}
CUBE_TRIANGLES :: 6 * 2
CUBE_VERTICES :: CUBE_TRIANGLES * 3
CUBE_POSITIONS: [CUBE_VERTICES]vec3 : {
{0, 0, 0}, // 0
{1, 0, 0},
{0, 0, 1},
{0, 0, 1}, // 1
{1, 0, 0},
{1, 0, 1},
{0, 0, 1}, // 2
{1, 0, 1},
{0, 1, 1},
{0, 1, 1}, // 3
{1, 0, 1},
{1, 1, 1},
{0, 0, 0}, // 4
{0, 0, 1},
{0, 1, 1},
{0, 0, 0}, // 5
{0, 1, 1},
{0, 1, 0},
{1, 0, 0}, // 6
{1, 1, 1},
{1, 0, 1},
{1, 0, 0}, // 7
{1, 1, 0},
{1, 1, 1},
{0, 0, 0}, // 8
{1, 1, 0},
{1, 0, 0},
{0, 0, 0}, // 9
{0, 1, 0},
{1, 1, 0},
{0, 1, 0}, // 10
{0, 1, 1},
{1, 1, 1},
{0, 1, 0}, // 11
{1, 1, 1},
{1, 1, 0},
}
CUBE_NORMALS: [CUBE_VERTICES]vec3 : {
{0, -1, 0}, // 0
{0, -1, 0},
{0, -1, 0},
{0, -1, 0}, // 1
{0, -1, 0},
{0, -1, 0},
{0, 0, 1}, // 2
{0, 0, 1},
{0, 0, 1},
{0, 0, 1}, // 3
{0, 0, 1},
{0, 0, 1},
{-1, 0, 0}, // 4
{-1, 0, 0},
{-1, 0, 0},
{-1, 0, 0}, // 5
{-1, 0, 0},
{-1, 0, 0},
{1, 0, 0}, // 6
{1, 0, 0},
{1, 0, 0},
{1, 0, 0}, // 7
{1, 0, 0},
{1, 0, 0},
{0, 0, -1}, // 8
{0, 0, -1},
{0, 0, -1},
{0, 0, -1}, // 9
{0, 0, -1},
{0, 0, -1},
{0, 1, 0}, // 10
{0, 1, 0},
{0, 1, 0},
{0, 1, 0}, // 11
{0, 1, 0},
{0, 1, 0},
}
get_cube_positions :: proc(pos: vec3 = 0, h: f32 = 1) -> [CUBE_VERTICES]vec3 {
positions := CUBE_POSITIONS
for &vec in positions {
vec = pos + (vec - {0.5, 0.5, 0.5}) * h
}
return positions
}
PYRAMID_TRIANGLES :: 6
PYRAMID_VERTICES :: PYRAMID_TRIANGLES * 3
<
ED18
div>
get_pyramid_positions :: proc(pos: vec3 = 0, h: f32 = 1) -> [PYRAMID_VERTICES]vec3 {
x := pos.x - h/2
y := pos.y - h/2
z := pos.z - h/2
return {
{x, y, z}, {x+h, y, z}, {x, y, z+h},
{x, y, z+h}, {x+h, y, z}, {x+h, y, z+h},
{x, y, z}, {x+h/2, y+h, z+h/2}, {x+h, y, z},
{x+h, y, z}, {x+h/2, y+h, z+h/2}, {x+h, y, z+h},
{x+h, y, z+h}, {x+h/2, y+h, z+h/2}, {x, y, z+h},
{x, y, z+h}, {x+h/2, y+h, z+h/2}, {x, y, z},
}
}
get_sphere_vertices :: #force_inline proc(segments: int) -> int {
return 6 * segments * segments
}
get_sphere_base_triangle :: proc(positions, normals: []vec3, radius: f32, segments: int) {
assert(segments % 2 == 0, "Sphere segments must be even")
assert(len(positions) == len(normals), "Positions and normals must have the same length")
assert(len(positions) % 3 == 0, "Positions must be a multiple of 3")
assert(len(positions) == get_sphere_vertices(segments), "Invalid number of vertices")
// TODO: merge top and bottom segment triangles
si := 0 // segment index
for vi in 0..<segments { // vertical
va0 := PI * (f32(vi) ) / f32(segments)
va1 := PI * (f32(vi)+1) / f32(segments)
hmove := 0.5 * f32(vi%2)
for hi in 0..<segments { // horizontal
ha0 := 2*PI * (f32(hi)-0.5 + hmove) / f32(segments)
ha1 := 2*PI * (f32(hi) + hmove) / f32(segments)
ha2 := 2*PI * (f32(hi)+0.5 + hmove) / f32(segments)
ha3 := 2*PI * (f32(hi)+1 + hmove) / f32(segments)
// Vertices
v0 := vec3{cos(ha0)*sin(va1), cos(va1), sin(ha0)*sin(va1)}
v1 := vec3{cos(ha1)*sin(va0), cos(va0), sin(ha1)*sin(va0)}
v2 := vec3{cos(ha2)*sin(va1), cos(va1), sin(ha2)*sin(va1)}
v3 := vec3{cos(ha3)*sin(va0), cos(va0), sin(ha3)*sin(va0)}
// Normals
n0 := normalize(v0)
n1 := normalize(v1)
n2 := normalize(v2)
n3 := normalize(v3)
// Triangle 1
positions[si+0] = v0 * radius
positions[si+1] = v1 * radius
positions[si+2] = v2 * radius
normals [si+0] = n0
normals [si+1] = n1
normals [si+2] = n2
// Triangle 2
positions[si+3] = v1 * radius
positions[si+4] = v3 * radius
positions[si+5] = v2 * radius
normals [si+3] = n1
normals [si+4] = n3
normals [si+5] = n2
si += 6
}
}
}
get_sphere_base_rectangle :: proc(positions, normals: []vec3, radius: f32, segments: int) {
assert(segments % 2 == 0, "Sphere segments must be even")
assert(len(positions) == len(normals), "Positions and normals must have the same length")
assert(len(positions) % 3 == 0, "Positions must be a multiple of 3")
assert(len(positions) == get_sphere_vertices(segments), "Invalid number of vertices")
// TODO: merge top and bottom segment triangles
si := 0 // segment index
for vi in 0..<segments { // vertical
for hi in 0..<segments { // horizontal
va0 := PI * f32(vi+0) / f32(segments)
va1 := PI * f32(vi+1) / f32(segments)
ha0 := 2*PI * f32(hi+0) / f32(segments)
ha1 := 2*PI * f32(hi+1) / f32(segments)
// Vertices
v0 := vec3{cos(ha0)*sin(va1), cos(va1), sin(ha0)*sin(va1)}
v1 := vec3{cos(ha0)*sin(va0), cos(va0), sin(ha0)*sin(va0)}
v2 := vec3{cos(ha1)*sin(va1), cos(va1), sin(ha1)*sin(va1)}
v3 := vec3{cos(ha1)*sin(va0), cos(va0), sin(ha1)*sin(va0)}
// Normals
n0 := normalize(v0)
n1 := normalize(v1)
n2 := normalize(v2)
n3 := normalize(v3)
// Triangle 1
positions[si+0] = v0 * radius
positions[si+1] = v1 * radius
positions[si+2] = v2 * radius
normals [si+0] = n0
normals [si+1] = n1
normals [si+2] = n2
// Triangle 2
positions[si+3] = v1 * radius
positions[si+4] = v3 * radius
positions[si+5] = v2 * radius
normals [si+3] = n1
normals [si+4] = n3
normals [si+5] = n2
si += 6
}
}
}
JOINT_TRIANGLES :: 8
JOINT_VERTICES :: 3 * JOINT_TRIANGLES
get_joint :: proc(from, to: vec3, w: f32) -> [JOINT_VERTICES]vec3 {
mid := from*(1.0/3.0) + to*(2.0/3.0)
from, to := from, to
if from.y > to.y {
from, to = to, from
}
normal := normalize(to - from)
cross_dir: vec3
if normal.x > 0.5 {
cross_dir = UP
}
else if normal.x < -0.5 {
cross_dir = DOWN
}
else if normal.z > 0.5 {
cross_dir = RIGHT
}
else if normal.z < -0.5 {
if normal.x > 0 {
cross_dir = UP
}
else {
cross_dir = DOWN
}
}
else {
cross_dir = RIGHT
}
normal_x := cross(normal, cross_dir)
normal_z := cross(normal, normal_x)
move_x := normal_x * w
move_z := normal_z * w
return {
from,
mid + move_z,
mid + move_x,
from,
mid - move_x,
mid + move_z,
from,
mid + move_x,
mid - move_z,
from,
mid - move_z,
mid - move_x,
mid + move_x,
mid + move_z,
to,
mid + move_z,
mid - move_x,
to,
mid - move_x,
mid - move_z,
to,
mid - move_z,
mid + move_x,
to,
}
}