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const c = @import("../c.zig");
const std = @import("std");
const vk = @import("vulkan.zig");
const gltf = @import("gltf.zig");
const Allocator = std.mem.Allocator;
pub const Vertex = struct {
position: [3]f32,
pub fn create(x: f32, y: f32, z: f32) Vertex {
return Vertex{
.position = .{ x, y, z },
};
}
pub fn bindingDescription() c.VkVertexInputBindingDescription {
const binding_description: c.VkVertexInputBindingDescription = .{
.binding = 0,
.stride = @sizeOf(Vertex),
.inputRate = c.VK_VERTEX_INPUT_RATE_VERTEX,
};
return binding_description;
}
pub fn attributeDescription() c.VkVertexInputAttributeDescription {
const attribute_description: c.VkVertexInputAttributeDescription = .{
.location = 0,
.binding = 0,
.format = c.VK_FORMAT_R32G32B32_SFLOAT,
.offset = 0,
};
return attribute_description;
}
};
pub const Mesh = struct {
vertex_buffer: vk.Buffer,
index_buffer: vk.Buffer,
pub fn createVertexBuffer(allocator: Allocator, device: anytype) !vk.Buffer {
const gltf_data = try gltf.parseFile(allocator, "assets/models/block.glb");
const vertices = gltf_data.vertices;
var data: [*c]?*anyopaque = null;
const buffer = try device.createBuffer(vk.BufferUsage{ .transfer_src = true }, vk.BufferFlags{ .host_visible = true, .host_coherent = true }, @sizeOf(Vertex) * vertices.len);
try vk.mapError(c.vkMapMemory(
device.handle,
buffer.memory,
0,
buffer.size,
0,
@ptrCast(&data),
));
if (data) |ptr| {
const gpu_vertices: [*]Vertex = @ptrCast(@alignCast(ptr));
@memcpy(gpu_vertices, @as([]Vertex, @ptrCast(vertices[0..])));
}
c.vkUnmapMemory(device.handle, buffer.memory);
const vertex_buffer = try device.createBuffer(vk.BufferUsage{ .vertex_buffer = true, .transfer_dst = true }, vk.BufferFlags{ .device_local = true }, @sizeOf(Vertex) * vertices.len);
try buffer.copyTo(device, vertex_buffer);
buffer.destroy(device.handle);
return vertex_buffer;
}
pub fn createIndexBuffer(allocator: Allocator, device: anytype) !vk.Buffer {
const gltf_data = try gltf.parseFile(allocator, "assets/models/block.glb");
const indices = gltf_data.indices;
//const indices = [_]u16{ 0, 1, 2, 3, 0, 2 };
var data: [*c]?*anyopaque = null;
const buffer = try device.createBuffer(vk.BufferUsage{ .transfer_src = true }, vk.BufferFlags{ .host_visible = true, .host_coherent = true }, @sizeOf(u16) * indices.len);
try vk.mapError(c.vkMapMemory(
device.handle,
buffer.memory,
0,
buffer.size,
0,
@ptrCast(&data),
));
if (data) |ptr| {
const gpu_indices: [*]u16 = @ptrCast(@alignCast(ptr));
@memcpy(gpu_indices, indices[0..]);
}
c.vkUnmapMemory(device.handle, buffer.memory);
const index_buffer = try device.createBuffer(vk.BufferUsage{ .index_buffer = true, .transfer_dst = true }, vk.BufferFlags{ .device_local = true }, @sizeOf(u16) * indices.len);
try buffer.copyTo(device, index_buffer);
buffer.destroy(device.handle);
return index_buffer;
}
pub fn create(allocator: Allocator, device: anytype) !Mesh {
const vertex_buffer = try Mesh.createVertexBuffer(allocator, device);
const index_buffer = try Mesh.createIndexBuffer(allocator, device);
return Mesh{
.vertex_buffer = vertex_buffer,
.index_buffer = index_buffer,
};
}
};
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