50 lines
1.0 KiB
Zig
50 lines
1.0 KiB
Zig
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const Vec2i = @import("geometry/Vec2i.zig");
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pub const Recti = struct {
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x: i32,
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y: i32,
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w: i32,
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h: i32,
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a: Vec2i,
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b: Vec2i,
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pub fn from_xywh(x: i32, y: i32, w: i32, h: i32) Recti {
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return .{
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.x = x,
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.y = y,
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.w = w,
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.h = h,
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.a = Vec2i.new(x, y),
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.b = Vec2i.new(x + w, y + h),
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};
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}
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};
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pub const Matrix4f = struct {
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values: [16]f32 = identity,
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const SIZE: i8 = 4 * 4;
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const identity = from_values([16]f32 {
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1, 0, 0, 0,
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0, 1, 0, 0,
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0, 0, 1, 0,
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0, 0, 0, 1,
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});
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pub fn from_values(values: [16]f32) Matrix4f {
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return .{ .values = values };
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}
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pub fn orthographic(left: f32, right: f32, bottom: f32, top: f32, near: f32, far: f32) Matrix4f {
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var ortho = Matrix4f.identity;
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ortho.values[0 + 0 * 4] = 2.0 / (right - left);
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ortho.values[1 + 1 * 4] = 2.0 / (top - bottom);
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ortho.values[2 + 2 * 4] = 2.0 / (near - far);
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ortho.values[0 + 3 * 4] = (left + right) / (left - right);
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ortho.values[1 + 3 * 4] = (bottom + top) / (bottom - top);
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ortho.values[2 + 3 * 4] = (far + near) / (far - near);
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return ortho;
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}
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};
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