copygirl
/
zig-bloxel-game
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Add textures to rendered primitives

Browse Source
main
copygirl 6 months ago
parent 42619616cc
commit 39c2eb6781
6 changed files with 138 additions and 63 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 11
      build.zig
  2. 4
      build.zig.zon
  3. BIN
      src/gfx/default.png
  4. 99
      src/primitives.zig
  5. 74
      src/renderer.zig
  6. 13
      src/shader.wgsl

11
build.zig
Unescape View File

@ -6,20 +6,17 @@ pub fn build(b: *std.Build) !void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const zmath_pkg = zmath.package(b, target, optimize, .{
.options = .{ .enable_cross_platform_determinism = true },
});
const mach_core_dep = b.dependency("mach_core", .{ .target = target, .optimize = optimize });
const zigimg_dep = b.dependency("zigimg", .{ .target = target, .optimize = optimize });
const zmath_pkg = zmath.package(b, target, optimize, .{});
const mach_core_dep = b.dependency("mach_core", .{
.target = target,
.optimize = optimize,
});
const app = try mach_core.App.init(b, mach_core_dep.builder, .{
.name = "zig-bloxel-game",
.src = "src/main.zig",
.target = target,
.optimize = optimize,
.deps = &.{
.{ .name = "zigimg", .module = zigimg_dep.module("zigimg") },
.{ .name = "zmath", .module = zmath_pkg.zmath },
},
});

4
build.zig.zon
Unescape View File

@ -14,6 +14,10 @@
.url = "https://pkg.machengine.org/mach-core/6a62bcc90e0d072d632788a6575d77942bd09a19.tar.gz",
.hash = "12209d39954fcda0be158461c10f64d14d5c7d097bd6d26785b332d75ffefa7dd7a0",
},
.zigimg = .{
.url = "https://github.com/zigimg/zigimg/archive/ad6ad042662856f55a4d67499f1c4606c9951031.tar.gz",
.hash = "1220bf6b616ca219f95be1205b12aa8cdb7e09838fcebeae90b48b5ab0a030c5ab45",
},
.zmath = .{ .path = "libs/zig-gamedev/libs/zmath" },
},
}

BIN
src/gfx/default.png
View File

Binary file not shown.
Side by Side

After

Width:  |  Height:  |  Size: 576 B

99
src/primitives.zig
Unescape View File

@ -10,6 +10,7 @@ const createAndWriteBuffer = Renderer.createAndWriteBuffer;
/// Describes the layout of each vertex that a primitive is made of.
pub const VertexData = struct {
position: [3]f32,
uv: [2]f32,
};
/// Contains the data to render a primitive (3D shape or model).
@ -43,8 +44,8 @@ pub fn createPrimitive(
};
}
fn vert(x: f32, y: f32, z: f32) VertexData {
return .{ .position = .{ x, y, z } };
fn vert(x: f32, y: f32, z: f32, tx: f32, ty: f32) VertexData {
return .{ .position = .{ x, y, z }, .uv = .{ tx, ty } };
}
pub fn createTrianglePrimitive(length: f32) PrimitiveData {
@ -60,9 +61,9 @@ pub fn createTrianglePrimitive(length: f32) PrimitiveData {
// / \
// 1-----2
&.{
vert(@sin(a0) * radius, @cos(a0) * radius, 0.0),
vert(@sin(a1) * radius, @cos(a1) * radius, 0.0),
vert(@sin(a2) * radius, @cos(a2) * radius, 0.0),
vert(@sin(a0) * radius, @cos(a0) * radius, 0.0, 0.5, 0.0),
vert(@sin(a1) * radius, @cos(a1) * radius, 0.0, 0.0, 1.0),
vert(@sin(a2) * radius, @cos(a2) * radius, 0.0, 1.0, 1.0),
},
// Vertices have to be specified in counter-clockwise,
// so the "front" of the triangle is facing the right way.
@ -83,10 +84,10 @@ pub fn createSquarePrimitive(width: f32) PrimitiveData {
// 1---3
&.{
// zig fmt: off
vert(-half_width, -half_width, 0.0),
vert(-half_width, half_width, 0.0),
vert( half_width, -half_width, 0.0),
vert( half_width, half_width, 0.0),
vert(-half_width, -half_width, 0.0, 0.0, 0.0),
vert(-half_width, half_width, 0.0, 0.0, 1.0),
vert( half_width, -half_width, 0.0, 1.0, 0.0),
vert( half_width, half_width, 0.0, 1.0, 1.0),
// zig fmt: on
},
// ... but it has to be split up into 2 triangles.
@ -127,35 +128,35 @@ pub fn createCubePrimitive(width: f32) PrimitiveData {
// zig fmt: off
&.{
// Right (+X)
vert( half_width, half_width, -half_width),
vert( half_width, -half_width, -half_width),
vert( half_width, half_width, half_width),
vert( half_width, -half_width, half_width),
vert( half_width, half_width, -half_width, 0.0, 0.0),
vert( half_width, -half_width, -half_width, 0.0, 1.0),
vert( half_width, half_width, half_width, 1.0, 0.0),
vert( half_width, -half_width, half_width, 1.0, 1.0),
// Left (-X)
vert(-half_width, half_width, half_width),
vert(-half_width, -half_width, half_width),
vert(-half_width, half_width, -half_width),
vert(-half_width, -half_width, -half_width),
vert(-half_width, half_width, half_width, 0.0, 0.0),
vert(-half_width, -half_width, half_width, 0.0, 1.0),
vert(-half_width, half_width, -half_width, 1.0, 0.0),
vert(-half_width, -half_width, -half_width, 1.0, 1.0),
// Top (+Y)
vert( half_width, half_width, -half_width),
vert( half_width, half_width, half_width),
vert(-half_width, half_width, -half_width),
vert(-half_width, half_width, half_width),
vert( half_width, half_width, -half_width, 0.0, 0.0),
vert( half_width, half_width, half_width, 0.0, 1.0),
vert(-half_width, half_width, -half_width, 1.0, 0.0),
vert(-half_width, half_width, half_width, 1.0, 1.0),
// Bottom (-Y)
vert(-half_width, -half_width, -half_width),
vert(-half_width, -half_width, half_width),
vert( half_width, -half_width, -half_width),
vert( half_width, -half_width, half_width),
vert(-half_width, -half_width, -half_width, 1.0, 0.0),
vert(-half_width, -half_width, half_width, 0.0, 0.0),
vert( half_width, -half_width, -half_width, 1.0, 1.0),
vert( half_width, -half_width, half_width, 0.0, 1.0),
// Front (+Z)
vert( half_width, half_width, half_width),
vert( half_width, -half_width, half_width),
vert(-half_width, half_width, half_width),
vert(-half_width, -half_width, half_width),
vert( half_width, half_width, half_width, 0.0, 0.0),
vert( half_width, -half_width, half_width, 0.0, 1.0),
vert(-half_width, half_width, half_width, 1.0, 0.0),
vert(-half_width, -half_width, half_width, 1.0, 1.0),
// Back (-Z)
vert(-half_width, half_width, -half_width),
vert(-half_width, -half_width, -half_width),
vert( half_width, half_width, -half_width),
vert( half_width, -half_width, -half_width),
vert(-half_width, half_width, -half_width, 0.0, 0.0),
vert(-half_width, -half_width, -half_width, 0.0, 1.0),
vert( half_width, half_width, -half_width, 1.0, 0.0),
vert( half_width, -half_width, -half_width, 1.0, 1.0),
},
&.{
0, 1, 2, 3, 2, 1, // Right
@ -175,26 +176,26 @@ pub fn createPyramidPrimitive(width: f32) PrimitiveData {
// zig fmt: off
&.{
// Right
vert( 0.0, half_width, 0.0),
vert( half_width, -half_width, -half_width),
vert( half_width, -half_width, half_width),
vert( 0.0, half_width, 0.0, 0.5, 0.0),
vert( half_width, -half_width, -half_width, 0.0, 1.0),
vert( half_width, -half_width, half_width, 1.0, 1.0),
// Left
vert( 0.0, half_width, 0.0),
vert(-half_width, -half_width, half_width),
vert(-half_width, -half_width, -half_width),
vert( 0.0, half_width, 0.0, 0.5, 0.0),
vert(-half_width, -half_width, half_width, 0.0, 1.0),
vert(-half_width, -half_width, -half_width, 1.0, 1.0),
// Front
vert( 0.0, half_width, 0.0),
vert( half_width, -half_width, half_width),
vert(-half_width, -half_width, half_width),
vert( 0.0, half_width, 0.0, 0.5, 0.0),
vert( half_width, -half_width, half_width, 0.0, 1.0),
vert(-half_width, -half_width, half_width, 1.0, 1.0),
// Back
vert( 0.0, half_width, 0.0),
vert(-half_width, -half_width, -half_width),
vert( half_width, -half_width, -half_width),
vert( 0.0, half_width, 0.0, 0.5, 0.0),
vert(-half_width, -half_width, -half_width, 0.0, 1.0),
vert( half_width, -half_width, -half_width, 1.0, 1.0),
// Bottom
vert(-half_width, -half_width, -half_width),
vert(-half_width, -half_width, half_width),
vert( half_width, -half_width, -half_width),
vert( half_width, -half_width, half_width),
vert(-half_width, -half_width, -half_width, 0.0, 0.0),
vert(-half_width, -half_width, half_width, 0.0, 1.0),
vert( half_width, -half_width, -half_width, 1.0, 0.0),
vert( half_width, -half_width, half_width, 1.0, 1.0),
},
&.{
0, 1, 2, // Right

74
src/renderer.zig
Unescape View File

@ -1,5 +1,9 @@
const std = @import("std");
const zigimg = @import("zigimg");
const Rgb24 = zigimg.color.Rgb24;
const Rgba32 = zigimg.color.Rgba32;
const core = @import("mach-core");
const gpu = core.gpu;
@ -40,6 +44,11 @@ pub fn init(app: *App) !*Renderer {
// A string buffer used to format objects' labels.
var label_buffer: [256]u8 = undefined;
// Embed `default.png` texture in the executable and upload it to the GPU.
const texture_bytes = @embedFile("./gfx/default.png");
const texture_view = try loadTexture(app.allocator, texture_bytes);
defer texture_view.release();
const shader_module = core.device.createShaderModuleWGSL("shader.wgsl", @embedFile("shader.wgsl"));
defer shader_module.release();
@ -56,8 +65,10 @@ pub fn init(app: *App) !*Renderer {
var model_bind_group_layout = core.device.createBindGroupLayout(&gpu.BindGroupLayout.Descriptor.init(.{
.label = "Model Bind Group Layout",
.entries = &.{
gpu.BindGroupLayout.Entry.buffer(0, .{ .vertex = true }, .uniform, false, 0),
gpu.BindGroupLayout.Entry.buffer(1, .{ .vertex = true }, .uniform, false, 0),
gpu.BindGroupLayout.Entry.sampler(0, .{ .fragment = true }, .filtering),
gpu.BindGroupLayout.Entry.texture(1, .{ .fragment = true }, .float, .dimension_2d, false),
gpu.BindGroupLayout.Entry.buffer(2, .{ .vertex = true }, .uniform, false, 0),
gpu.BindGroupLayout.Entry.buffer(3, .{ .vertex = true }, .uniform, false, 0),
},
}));
defer model_bind_group_layout.release();
@ -82,6 +93,7 @@ pub fn init(app: *App) !*Renderer {
.step_mode = .vertex,
.attributes = &.{
.{ .format = .float32x3, .shader_location = 0, .offset = @offsetOf(VertexData, "position") },
.{ .format = .float32x2, .shader_location = 1, .offset = @offsetOf(VertexData, "uv") },
},
}),
},
@ -116,6 +128,11 @@ pub fn init(app: *App) !*Renderer {
},
}));
// Create a sampler that tells the GPU how to sample pixels from a texture.
// Includes filtering (nearest-neighbor, linear, ..) and wrapping behavior.
const texture_sampler = core.device.createSampler(&.{});
defer texture_sampler.release();
// Set up the primitives we want to render.
//
// Using `dupe` to allocate a slice here allows easily adjusting the
@ -171,8 +188,10 @@ pub fn init(app: *App) !*Renderer {
.label = model_bind_group_label,
.layout = model_bind_group_layout,
.entries = &.{
gpu.BindGroup.Entry.buffer(0, model_matrix_buffer, 0, @sizeOf(zm.Mat)),
gpu.BindGroup.Entry.buffer(1, model_color_buffer, 0, @sizeOf([3]f32)),
gpu.BindGroup.Entry.sampler(0, texture_sampler),
gpu.BindGroup.Entry.textureView(1, texture_view),
gpu.BindGroup.Entry.buffer(2, model_matrix_buffer, 0, @sizeOf(zm.Mat)),
gpu.BindGroup.Entry.buffer(3, model_color_buffer, 0, @sizeOf([3]f32)),
},
}));
@ -318,6 +337,53 @@ pub fn update(self: *Renderer) void {
core.queue.submit(&.{command});
}
/// Loads a texture from the provided buffer and uploads it to the GPU.
pub fn loadTexture(allocator: std.mem.Allocator, buffer: []const u8) !*gpu.TextureView {
var img = try zigimg.Image.fromMemory(allocator, buffer);
defer img.deinit();
const img_size = gpu.Extent3D{
.width = @intCast(img.width),
.height = @intCast(img.height),
};
const texture = core.device.createTexture(&.{
.size = img_size,
.format = .rgba8_unorm,
.usage = .{
.texture_binding = true,
.copy_dst = true,
.render_attachment = true,
},
});
defer texture.release();
const data_layout = gpu.Texture.DataLayout{
.bytes_per_row = @intCast(img.width * 4),
.rows_per_image = @intCast(img.height),
};
switch (img.pixels) {
.rgba32 => |pixels| {
core.queue.writeTexture(&.{ .texture = texture }, &data_layout, &img_size, pixels);
},
.rgb24 => |pixels_rgb24| {
const pixels = try rgb24ToRgba32(allocator, pixels_rgb24);
defer allocator.free(pixels);
core.queue.writeTexture(&.{ .texture = texture }, &data_layout, &img_size, pixels);
},
else => std.debug.panic("Unsupported image color format {s}", .{@tagName(img.pixels)}),
}
return texture.createView(&.{});
}
/// Converts a raw 24-bit RGB pixel buffer to 32-bit RGBA.
fn rgb24ToRgba32(allocator: std.mem.Allocator, in: []Rgb24) ![]Rgba32 {
const out = try allocator.alloc(Rgba32, in.len);
for (in, out) |src, *dest|
dest.* = .{ .r = src.r, .g = src.g, .b = src.b, .a = 255 };
return out;
}
/// Creates a depth texture. This is used to ensure that when things are
/// rendered, an object behind another won't draw over one in front, simply
/// because it was rendered at a later point in time.

13
src/shader.wgsl
Unescape View File

@ -1,15 +1,20 @@
@group(0) @binding(0) var<uniform> view_proj_matrix: mat4x4<f32>;
@group(1) @binding(0) var<uniform> model_matrix: mat4x4<f32>;
@group(1) @binding(1) var<uniform> model_color: vec3<f32>;
@group(1) @binding(0) var texture_sampler: sampler;
@group(1) @binding(1) var model_texture: texture_2d<f32>;
@group(1) @binding(2) var<uniform> model_matrix: mat4x4<f32>;
@group(1) @binding(3) var<uniform> model_color: vec3<f32>;
struct VertexInput {
@location(0) position: vec3<f32>,
@location(1) uv: vec2<f32>,
};
struct VertexOutput {
@builtin(position) position: vec4<f32>,
@location(0) color: vec4<f32>,
@location(1) frag_uv: vec2<f32>,
};
struct FragmentOutput {
@ -21,11 +26,13 @@ struct FragmentOutput {
let mvp = model_matrix * view_proj_matrix;
out.position = vec4<f32>(in.position, 1.0) * mvp;
out.color = vec4<f32>(model_color, 1.0);
out.frag_uv = in.uv;
return out;
}
@fragment fn frag_main(in: VertexOutput) -> FragmentOutput {
var out: FragmentOutput;
out.pixel_color = in.color;
let texture_color = textureSample(model_texture, texture_sampler, in.frag_uv);
out.pixel_color = texture_color * in.color;
return out;
}

Write Preview
Loading…
Cancel
Save