45 lines
1.2 KiB
Zig
45 lines
1.2 KiB
Zig
const std = @import("std");
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const ArrayList = std.ArrayList;
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const zm = @import("zmath");
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const Mesh = @import("mesh.zig");
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const Shader = @import("shader.zig");
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const Tree = @import("../tree.zig").Tree;
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pub const JointData = struct {
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mesh: Mesh,
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translation: zm.Mat,
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rotation: zm.Quat,
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};
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data: Tree(JointData),
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pub fn init(
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data: Tree(JointData),
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) @This() {
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return .{ .data = data };
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}
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pub fn draw(self: *@This(), shader: Shader) void {
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var iter = self.data.depthFirstIterator();
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while (iter.next()) |node| {
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var rotation = node.val.rotation;
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var current = node;
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while (current.parent) |parent| {
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rotation = zm.qmul(rotation, parent.val.rotation);
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current = parent;
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}
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const model_matrix = zm.mul(zm.quatToMat(rotation), node.val.translation);
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const normal_matrix = zm.transpose(zm.inverse(model_matrix));
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shader.updateUniformMatrix("u_model_matrix", &.{model_matrix});
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shader.updateUniformMatrix("u_normal_matrix", &.{normal_matrix});
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node.val.mesh.draw(shader);
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}
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}
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pub fn deinit(self: *@This(), allocator: std.mem.Allocator) void {
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self.data.deinit(allocator);
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}
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