76 lines
2.2 KiB
Rust
76 lines
2.2 KiB
Rust
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use macroquad::prelude as mq;
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pub fn draw_cuboid(center: mq::Vec3, size: mq::Vec3, color: mq::Color) {
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use mq::{Vec2, Vec3, Vertex};
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let hs = size * 0.5;
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let mut positions = [
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Vec3::new(-hs.x, -hs.y, -hs.z),
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Vec3::new(hs.x, -hs.y, -hs.z),
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Vec3::new(hs.x, hs.y, -hs.z),
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Vec3::new(-hs.x, hs.y, -hs.z),
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Vec3::new(-hs.x, -hs.y, hs.z),
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Vec3::new(hs.x, -hs.y, hs.z),
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Vec3::new(hs.x, hs.y, hs.z),
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Vec3::new(-hs.x, hs.y, hs.z),
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];
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for i in 0..positions.len() {
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positions[i] += center;
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}
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let faces = [
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([0, 1, 2, 3], Vec3::new(0.0, 0.0, -1.0)), // Back
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([5, 4, 7, 6], Vec3::new(0.0, 0.0, 1.0)), // Front
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([4, 0, 3, 7], Vec3::new(-1.0, 0.0, 0.0)), // Left
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([1, 5, 6, 2], Vec3::new(1.0, 0.0, 0.0)), // Right
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([3, 2, 6, 7], Vec3::new(0.0, 1.0, 0.0)), // Up
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([4, 5, 1, 0], Vec3::new(0.0, -1.0, 0.0)), // Down
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];
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let uvs = [
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Vec2::new(0.0, 0.0),
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Vec2::new(1.0, 0.0),
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Vec2::new(1.0, 1.0),
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Vec2::new(0.0, 1.0),
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];
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let mut vertices = [Vertex {
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position: mq::Vec3::ZERO,
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uv: mq::Vec2::ZERO,
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color: color.into(),
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normal: mq::Vec4::ZERO,
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}; 24];
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let mut vi = 0;
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for (face, normal) in faces.iter() {
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for (j, &corner) in face.iter().enumerate() {
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let pos = positions[corner];
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vertices[vi] = Vertex {
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position: mq::vec3(pos.x, pos.y, pos.z),
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uv: mq::vec2(uvs[j].x, uvs[j].y),
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color: color.into(),
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normal: mq::vec4(normal.x, normal.y, normal.z, 0.0),
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};
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vi += 1;
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}
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}
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let mut indices = [0u16; 36];
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for i in 0..6 {
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let base = (i * 4) as u16;
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let offset = i * 6;
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indices[offset + 0] = base;
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indices[offset + 1] = base + 1;
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indices[offset + 2] = base + 2;
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indices[offset + 3] = base;
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indices[offset + 4] = base + 2;
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indices[offset + 5] = base + 3;
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}
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unsafe {
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mq::get_internal_gl()
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.quad_gl
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.draw_mode(mq::DrawMode::Triangles);
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mq::get_internal_gl().quad_gl.geometry(&vertices, &indices);
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}
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}
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