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main.zig
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main.zig
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// SPDX-License-Identifier: MIT
// Copyright (c) 2024 Keith Chambers
const std = @import("std");
const fontana = @import("fontana");
const app = @import("app.zig");
const graphics = @import("graphics.zig");
const GenericVertex = graphics.GenericVertex;
const geometry = @import("geometry.zig");
const Extent2D = geometry.Extent2D;
const builtin = @import("builtin");
const build_mode = builtin.mode;
const is_debug = (build_mode == .Debug);
const TextWriterInterface = struct {
quad_writer: *app.QuadFaceWriter(GenericVertex),
pub fn write(
self: *@This(),
screen_extent: geometry.Extent2D(f32),
texture_extent: geometry.Extent2D(f32),
) f32 {
const quad_ptr = self.quad_writer.create() catch return 0.0;
quad_ptr.* = graphics.generateTexturedQuad(
GenericVertex,
screen_extent,
texture_extent,
.bottom_left,
);
return 0.0;
}
};
const application_name = "fontana tester";
const fonts = struct {
const dejavu_sans = "assets/DejaVuSans.ttf";
const roboto_light = "assets/Roboto-Light.ttf";
const roboto_medium = "assets/Roboto-Medium.ttf";
const roboto_mono = "assets/RobotoMono.ttf";
};
const atlas_codepoints = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!._,:";
const point_size_large: f64 = 16.0;
const point_size_small: f64 = 11.0;
//
// Color code the container rectangles
//
const color_fontana_small = graphics.RGBA(u8).fromInt(u8, 35, 65, 45, 255);
const color_fontana_large = graphics.RGBA(u8).fromInt(u8, 45, 75, 55, 255);
const color_freetype_small = graphics.RGBA(u8).fromInt(u8, 75, 45, 55, 255);
const color_freetype_large = graphics.RGBA(u8).fromInt(u8, 85, 55, 65, 255);
const color_harfbuzz_small = graphics.RGBA(u8).fromInt(u8, 50, 51, 31, 255);
const color_harfbuzz_large = graphics.RGBA(u8).fromInt(u8, 60, 61, 41, 255);
//
// This may be wrong and lead to incorrect results, depending on your physical output display
//
const points_per_pixel = 100;
const Atlas = fontana.Atlas;
var text_writer_interface: TextWriterInterface = undefined;
var gpa = if (is_debug) std.heap.GeneralPurposeAllocator(.{}){} else {};
var texture_dimensions: geometry.Dimensions2D(u16) = undefined;
//
// This allows us to inject our own types and avoid casting / re-creating
//
const standard_type_overrides = fontana.OverridableTypes{
.Extent2DPixel = geometry.Extent2D(u32),
.Extent2DNative = geometry.Extent2D(f32),
.Coordinates2DNative = geometry.Coordinates2D(f32),
.Scale2D = geometry.Scale2D(f64),
.Dimensions2DNative = geometry.Dimensions2D(f32),
};
//
// We need to specify the pixel format of the bitmap texture where the glyphs
// will be rendered to. Defining PixelType is optional as each pixel_format
// has a default PixelType that can be used.
//
const standard_pen_options = fontana.PenOptions{
.pixel_format = .r8g8b8a8,
.PixelType = graphics.RGBA(u8),
};
//
// A Font type is generated for all three possible backends
//
const FontFontana = fontana.Font(.{
.backend = .fontana,
.type_overrides = standard_type_overrides,
});
const FontFreetype = fontana.Font(.{
.backend = .freetype,
.type_overrides = standard_type_overrides,
});
const FontFreetypeHarfbuzz = fontana.Font(.{
.backend = .freetype_harfbuzz,
.type_overrides = standard_type_overrides,
});
//
// For each font backend, we'll create two separate pens; One at a larger and smaller size
//
var pen_fontana_small: FontFontana.PenConfig(standard_pen_options) = undefined;
var pen_fontana_large: FontFontana.PenConfig(standard_pen_options) = undefined;
var pen_freetype_small: ?FontFreetype.PenConfig(standard_pen_options) = null;
var pen_freetype_large: ?FontFreetype.PenConfig(standard_pen_options) = null;
var pen_harfbuzz_small: ?FontFreetypeHarfbuzz.PenConfig(standard_pen_options) = null;
var pen_harfbuzz_large: ?FontFreetypeHarfbuzz.PenConfig(standard_pen_options) = null;
pub fn main() !void {
const allocator = if (is_debug) gpa.allocator() else std.heap.c_allocator;
defer {
if (comptime is_debug) {
_ = gpa.deinit();
}
}
try app.init(allocator, application_name);
const texture = app.getTextureMut();
var fontana_font: FontFontana = blk: {
const file_handle = try std.fs.cwd().openFile(fonts.dejavu_sans, .{ .mode = .read_only });
defer file_handle.close();
const max_size_bytes = 10 * 1024 * 1024; // 10mib
const font_file_bytes = try file_handle.readToEndAlloc(allocator, max_size_bytes);
break :blk FontFontana.construct(font_file_bytes);
} catch |err| {
std.log.err("Failed to load font file ({s}). Error: {}", .{ fonts.dejavu_sans, err });
return err;
};
defer fontana_font.deinit(allocator);
//
// Freetype and Harfbuzz backends can fail if libraries aren't installed. In that case an error is
// logged and only text from the fontana backend will be displayed
//
var freetype_font_opt: ?FontFreetype = blk: {
const file_handle = try std.fs.cwd().openFile(fonts.roboto_mono, .{ .mode = .read_only });
defer file_handle.close();
const max_size_bytes = 10 * 1024 * 1024; // 10mib
const font_file_bytes = try file_handle.readToEndAlloc(allocator, max_size_bytes);
break :blk FontFreetype.construct(font_file_bytes) catch {
std.log.warn("Failed to load freetype backend. Library may not be installed on system", .{});
break :blk null;
};
};
defer {
if (freetype_font_opt) |*freetype_font| {
freetype_font.deinit(allocator);
}
}
var harfbuzz_font_opt: ?FontFreetypeHarfbuzz = blk: {
const file_handle = try std.fs.cwd().openFile(fonts.roboto_medium, .{ .mode = .read_only });
defer file_handle.close();
const max_size_bytes = 10 * 1024 * 1024; // 10mib
const font_file_bytes = try file_handle.readToEndAlloc(allocator, max_size_bytes);
break :blk FontFreetypeHarfbuzz.construct(font_file_bytes) catch {
std.log.warn("Failed to load freetype_harfbuzz backend. Freetype and/or Harfubzz libraries may not be installed on system", .{});
break :blk null;
};
};
defer {
if (harfbuzz_font_opt) |*harfbuzz_font| {
harfbuzz_font.deinit(allocator);
}
}
texture_dimensions = .{
.width = texture.dimensions.width,
.height = texture.dimensions.height,
};
const font_setup_start = std.time.nanoTimestamp();
var atlas = try Atlas.init(allocator, texture.dimensions.width);
defer atlas.deinit(allocator);
pen_fontana_small = try fontana_font.createPen(
standard_pen_options,
allocator,
point_size_small,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
texture.pixels,
&atlas,
);
pen_fontana_large = try fontana_font.createPen(
standard_pen_options,
allocator,
point_size_large,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
@ptrCast(@alignCast(texture.pixels)),
&atlas,
);
defer pen_fontana_small.deinit(allocator);
defer pen_fontana_large.deinit(allocator);
if (freetype_font_opt) |*freetype_font| {
pen_freetype_small = try freetype_font.createPen(
standard_pen_options,
allocator,
point_size_small,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
@ptrCast(@alignCast(texture.pixels)),
&atlas,
);
pen_freetype_large = try freetype_font.createPen(
standard_pen_options,
allocator,
point_size_large,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
@ptrCast(@alignCast(texture.pixels)),
&atlas,
);
}
defer {
if (pen_freetype_small) |*pen|
pen.deinit(allocator);
if (pen_freetype_large) |*pen|
pen.deinit(allocator);
}
if (harfbuzz_font_opt) |*harfbuzz_font| {
pen_harfbuzz_small = try harfbuzz_font.createPen(
standard_pen_options,
allocator,
point_size_small,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
@ptrCast(@alignCast(texture.pixels)),
&atlas,
);
pen_harfbuzz_large = try harfbuzz_font.createPen(
standard_pen_options,
allocator,
point_size_large,
points_per_pixel,
atlas_codepoints,
texture.dimensions.width,
@ptrCast(@alignCast(texture.pixels)),
&atlas,
);
}
defer {
if (pen_harfbuzz_small) |*pen|
pen.deinit(allocator);
if (pen_harfbuzz_large) |*pen|
pen.deinit(allocator);
}
const font_setup_end = std.time.nanoTimestamp();
const font_setup_duration: u64 = @intCast(font_setup_end - font_setup_start);
std.log.info("Font setup in {} in mode `{s}`", .{
std.fmt.fmtDuration(font_setup_duration),
@tagName(build_mode),
});
text_writer_interface = .{ .quad_writer = app.faceWriter() };
app.onResize = onResize;
try app.doLoop();
}
fn onResize(width: f32, height: f32) void {
std.log.info("Resizing: {d}, {d}", .{ width, height });
const scale_factor = app.scaleFactor();
const large_container_dimensions = geometry.Dimensions2D(f32){
.width = @floatCast(800 * scale_factor.horizontal),
.height = @floatCast(80 * scale_factor.vertical),
};
const small_container_dimensions = geometry.Dimensions2D(f32){
.width = @floatCast(600 * scale_factor.horizontal),
.height = @floatCast(60 * scale_factor.vertical),
};
const placement_x_small: f32 = -1.0 + ((2.0 - small_container_dimensions.width) / 2.0);
const placement_x_large: f32 = -1.0 + ((2.0 - large_container_dimensions.width) / 2.0);
var placement_y: f32 = -0.5;
var quad_writer = app.faceWriter();
var quads = quad_writer.allocate(6) catch |err| {
std.log.err("Failed to allocate quad. Error: {}", .{err});
return;
};
const y_offset: f32 = @floatCast(100 * scale_factor.vertical);
{
const container_extent_small = geometry.Extent2D(f32){
.x = placement_x_small,
.y = placement_y,
.width = small_container_dimensions.width,
.height = small_container_dimensions.height,
};
const container_extent_large = geometry.Extent2D(f32){
.x = placement_x_large,
.y = placement_y + y_offset,
.width = large_container_dimensions.width,
.height = large_container_dimensions.height,
};
quads[0] = graphics.generateQuadColored(
GenericVertex,
.{
.x = placement_x_small,
.y = placement_y,
.width = small_container_dimensions.width,
.height = small_container_dimensions.height,
},
color_fontana_small,
.bottom_left,
);
quads[1] = graphics.generateQuadColored(
GenericVertex,
.{
.x = placement_x_large,
.y = placement_y + y_offset,
.width = large_container_dimensions.width,
.height = large_container_dimensions.height,
},
color_fontana_large,
.bottom_left,
);
pen_fontana_small.writeCentered(
"Fontana: The quick brown fox jumps over the lazy dog.",
container_extent_small,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
pen_fontana_large.writeCentered(
"Fontana: The quick brown fox jumps over the lazy dog.",
container_extent_large,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
placement_y += y_offset * 2;
}
var quad_index: u32 = 2;
if (pen_freetype_small) |*pen| {
const container = geometry.Extent2D(f32){
.x = placement_x_small,
.y = placement_y,
.width = small_container_dimensions.width,
.height = small_container_dimensions.height,
};
quads[quad_index] = graphics.generateQuadColored(
GenericVertex,
container,
color_freetype_small,
.bottom_left,
);
pen.writeCentered(
"Freetype: The quick brown fox jumps over the lazy dog.",
container,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
quad_index += 1;
placement_y += y_offset;
}
if (pen_freetype_large) |*pen| {
const container = geometry.Extent2D(f32){
.x = placement_x_large,
.y = placement_y,
.width = large_container_dimensions.width,
.height = large_container_dimensions.height,
};
quads[quad_index] = graphics.generateQuadColored(
GenericVertex,
container,
color_freetype_large,
.bottom_left,
);
pen.writeCentered(
"Freetype: The quick brown fox jumps over the lazy dog.",
container,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
quad_index += 1;
placement_y += y_offset;
}
if (pen_harfbuzz_small) |*pen| {
const container = geometry.Extent2D(f32){
.x = placement_x_small,
.y = placement_y,
.width = small_container_dimensions.width,
.height = small_container_dimensions.height,
};
quads[quad_index] = graphics.generateQuadColored(
GenericVertex,
container,
color_harfbuzz_small,
.bottom_left,
);
pen.writeCentered(
"Harfbuzz: The quick brown fox jumps over the lazy dog.",
container,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
quad_index += 1;
placement_y += y_offset;
}
if (pen_harfbuzz_large) |*pen| {
const container = geometry.Extent2D(f32){
.x = placement_x_large,
.y = placement_y,
.width = large_container_dimensions.width,
.height = large_container_dimensions.height,
};
quads[quad_index] = graphics.generateQuadColored(
GenericVertex,
container,
color_harfbuzz_large,
.bottom_left,
);
pen.writeCentered(
"Harfbuzz: The quick brown fox jumps over the lazy dog.",
container,
.{ .horizontal = scale_factor.horizontal, .vertical = scale_factor.vertical },
&text_writer_interface,
) catch |err| {
std.log.err("Failed to draw text. Error: {}", .{err});
};
quad_index += 1;
placement_y += y_offset;
}
}