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v/examples/sokol/fonts.v

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import sokol
import sokol.sapp
import sokol.gfx
import sokol.sgl
import fontstash
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import sokol.sfons
import os
struct AppState {
mut:
pass_action gfx.PassAction
font_context &fontstash.Context
font_normal int
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}
fn main() {
mut color_action := gfx.ColorAttachmentAction{
action: .clear
value: gfx.Color{
r: 0.3
g: 0.3
b: 0.32
a: 1.0
}
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}
mut pass_action := gfx.PassAction{}
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pass_action.colors[0] = color_action
state := &AppState{
pass_action: pass_action
font_context: unsafe { nil } // &fontstash.Context(0)
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}
title := 'V Metal/GL Text Rendering'
desc := sapp.Desc{
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user_data: state
init_userdata_cb: init
frame_userdata_cb: frame
window_title: title.str
html5_canvas_name: title.str
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}
sapp.run(&desc)
}
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fn init(mut state AppState) {
desc := sapp.create_desc()
gfx.setup(&desc)
s := &sgl.Desc{}
sgl.setup(s)
state.font_context = sfons.create(512, 512, 1)
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// or use DroidSerif-Regular.ttf
if bytes := os.read_bytes(os.resource_abs_path(os.join_path('..', 'assets', 'fonts',
'RobotoMono-Regular.ttf')))
{
println('loaded font: ${bytes.len}')
state.font_normal = state.font_context.add_font_mem('sans', bytes, false)
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}
}
fn frame(user_data voidptr) {
mut state := &AppState(user_data)
state.render_font()
gfx.begin_default_pass(&state.pass_action, sapp.width(), sapp.height())
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sgl.draw()
gfx.end_pass()
gfx.commit()
}
fn (state &AppState) render_font() {
mut sx := f32(0.0)
mut sy := f32(0.0)
mut dx := f32(0.0)
mut dy := f32(0.0)
lh := f32(0.0)
white := sfons.rgba(255, 255, 255, 255)
black := sfons.rgba(0, 0, 0, 255)
brown := sfons.rgba(192, 128, 0, 128)
blue := sfons.rgba(0, 192, 255, 255)
font_context := state.font_context
font_context.clear_state()
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sgl.defaults()
sgl.matrix_mode_projection()
sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
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sx = 0
sy = 50
dx = sx
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dy = sy
font_context.set_font(state.font_normal)
font_context.set_size(100.0)
ascender := f32(0.0)
descender := f32(0.0)
font_context.vert_metrics(&ascender, &descender, &lh)
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dx = sx
dy += lh
font_context.set_color(white)
dx = font_context.draw_text(dx, dy, 'The quick ')
font_context.set_font(state.font_normal)
font_context.set_size(48.0)
font_context.set_color(brown)
dx = font_context.draw_text(dx, dy, 'brown ')
font_context.set_font(state.font_normal)
font_context.set_size(24.0)
font_context.set_color(white)
dx = font_context.draw_text(dx, dy, 'fox ')
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dx = sx
dy += lh * 1.2
font_context.set_size(20.0)
font_context.set_font(state.font_normal)
font_context.set_color(blue)
font_context.draw_text(dx, dy, 'Now is the time for all good men to come to the aid of the party.')
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dx = 300
dy = 350
font_context.set_alignment(.left | .baseline)
font_context.set_size(60.0)
font_context.set_font(state.font_normal)
font_context.set_color(white)
font_context.set_spacing(5.0)
font_context.set_blur(6.0)
font_context.draw_text(dx, dy, 'Blurry...')
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dx = 300
dy += 50.0
font_context.set_size(28.0)
font_context.set_font(state.font_normal)
font_context.set_color(white)
font_context.set_spacing(0.0)
font_context.set_blur(3.0)
font_context.draw_text(dx, dy + 2, 'DROP SHADOW')
font_context.set_color(black)
font_context.set_blur(0)
font_context.draw_text(dx, dy, 'DROP SHADOW')
font_context.set_size(18.0)
font_context.set_font(state.font_normal)
font_context.set_color(white)
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dx = 50
dy = 350
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line(f32(dx - 10), f32(dy), f32(dx + 250), f32(dy))
font_context.set_alignment(.left | .top)
dx = font_context.draw_text(dx, dy, 'Top')
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dx += 10
font_context.set_alignment(.left | .middle)
dx = font_context.draw_text(dx, dy, 'Middle')
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dx += 10
font_context.set_alignment(.left | .baseline)
dx = font_context.draw_text(dx, dy, 'Baseline')
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dx += 10
font_context.set_alignment(.left | .bottom)
font_context.draw_text(dx, dy, 'Bottom')
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dx = 150
dy = 400
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line(f32(dx), f32(dy - 30), f32(dx), f32(dy + 80.0))
font_context.set_alignment(.left | .baseline)
font_context.draw_text(dx, dy, 'Left')
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dy += 30
font_context.set_alignment(.center | .baseline)
font_context.draw_text(dx, dy, 'Center')
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dy += 30
font_context.set_alignment(.right | .baseline)
font_context.draw_text(dx, dy, 'Right')
sfons.flush(font_context)
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}
fn line(sx f32, sy f32, ex f32, ey f32) {
sgl.begin_lines()
sgl.c4b(255, 255, 0, 128)
sgl.v2f(sx, sy)
sgl.v2f(ex, ey)
sgl.end()
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}