v/examples/sokol/fonts.v

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import sokol
import sokol.sapp
import sokol.gfx
import sokol.sgl
import sokol.sfons
import os
import time
struct AppState {
mut:
pass_action C.sg_pass_action
fons &C.FONScontext
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font_normal int
}
fn main() {
mut color_action := sg_color_attachment_action{
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action: C.SG_ACTION_CLEAR
}
color_action.val[0] = 0.3
color_action.val[1] = 0.3
color_action.val[2] = 0.32
color_action.val[3] = 1.0
mut pass_action := sg_pass_action{}
pass_action.colors[0] = color_action
state := &AppState{
pass_action: pass_action
fons: &C.FONScontext(0)
}
title := 'V Metal/GL Text Rendering'
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desc := sapp_desc{
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)
}
fn init(user_data voidptr) {
mut state := &AppState(user_data)
// dont actually alocate this on the heap in real life
gfx.setup(&sg_desc{
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mtl_device: C.sapp_metal_get_device()
mtl_renderpass_descriptor_cb: sapp_metal_get_renderpass_descriptor
mtl_drawable_cb: sapp_metal_get_drawable
d3d11_device: sapp_d3d11_get_device()
d3d11_device_context: sapp_d3d11_get_device_context()
d3d11_render_target_view_cb: sapp_d3d11_get_render_target_view
d3d11_depth_stencil_view_cb: sapp_d3d11_get_depth_stencil_view
})
s := &C.sgl_desc_t{}
C.sgl_setup(s)
state.fons = sfons.create(512, 512, 1)
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// or use DroidSerif-Regular.ttf
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if bytes := os.read_bytes(os.resource_abs_path('../assets/fonts/RobotoMono-Regular.ttf')) {
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println('loaded font: $bytes.len')
state.font_normal = C.fonsAddFontMem(state.fons, 'sans', bytes.data, bytes.len, false)
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}
}
fn frame(user_data voidptr) {
t := time.ticks()
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mut state := &AppState(user_data)
state.render_font()
gfx.begin_default_pass(&state.pass_action, sapp_width(), sapp_height())
sgl.draw()
gfx.end_pass()
gfx.commit()
// println(time.ticks()-t)
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}
fn (state &AppState) render_font() {
mut sx := 0.0
mut sy := 0.0
mut dx := 0.0
mut dy := 0.0
lh := f32(0.0)
white := C.sfons_rgba(255, 255, 255, 255)
black := C.sfons_rgba(0, 0, 0, 255)
brown := C.sfons_rgba(192, 128, 0, 128)
blue := C.sfons_rgba(0, 192, 255, 255)
state.fons.clear_state()
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sgl.defaults()
sgl.matrix_mode_projection()
sgl.ortho(0.0, f32(C.sapp_width()), f32(C.sapp_height()), 0.0, -1.0, 1.0)
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sx = 0
sy = 50
dx = sx
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dy = sy
state.fons.set_font(state.font_normal)
state.fons.set_size(100.0)
ascender := f32(0.0)
descender := f32(0.0)
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state.fons.vert_metrics(&ascender, &descender, &lh)
dx = sx
dy += lh
C.fonsSetColor(state.fons, white)
dx = C.fonsDrawText(state.fons, dx, dy, c'The quick ', C.NULL)
fonsSetFont(state.fons, state.font_normal)
fonsSetSize(state.fons, 48.0)
fonsSetColor(state.fons, brown)
dx = fonsDrawText(state.fons, dx, dy, c'brown ', C.NULL)
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fonsSetFont(state.fons, state.font_normal)
fonsSetSize(state.fons, 24.0)
fonsSetColor(state.fons, white)
dx = fonsDrawText(state.fons, dx, dy, c'fox ', C.NULL)
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dx = sx
dy += lh * 1.2
fonsSetSize(state.fons, 20.0)
fonsSetFont(state.fons, state.font_normal)
fonsSetColor(state.fons, blue)
fonsDrawText(state.fons, dx, dy, c'Now is the time for all good men to come to the aid of the party.', C.NULL)
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dx = 300
dy = 350
fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_BASELINE)
fonsSetSize(state.fons, 60.0)
fonsSetFont(state.fons, state.font_normal)
fonsSetColor(state.fons, white)
fonsSetSpacing(state.fons, 5.0)
fonsSetBlur(state.fons, 6.0)
fonsDrawText(state.fons, dx, dy, c'Blurry...', C.NULL)
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dx = 300
dy += 50.0
fonsSetSize(state.fons, 28.0)
fonsSetFont(state.fons, state.font_normal)
fonsSetColor(state.fons, white)
fonsSetSpacing(state.fons, 0.0)
fonsSetBlur(state.fons, 3.0)
fonsDrawText(state.fons, dx, dy + 2, c'DROP SHADOW', C.NULL)
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fonsSetColor(state.fons, black)
fonsSetBlur(state.fons, 0)
fonsDrawText(state.fons, dx, dy, c'DROP SHADOW', C.NULL)
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fonsSetSize(state.fons, 18.0)
fonsSetFont(state.fons, state.font_normal)
fonsSetColor(state.fons, white)
dx = 50
dy = 350
line(dx - 10, dy, dx + 250, dy)
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C.fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_TOP)
dx = C.fonsDrawText(state.fons, dx, dy, c'Top', C.NULL)
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dx += 10
C.fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_MIDDLE)
dx = C.fonsDrawText(state.fons, dx, dy, c'Middle', C.NULL)
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dx += 10
C.fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_BASELINE)
dx = C.fonsDrawText(state.fons, dx, dy, c'Baseline', C.NULL)
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dx += 10
C.fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_BOTTOM)
C.fonsDrawText(state.fons, dx, dy, c'Bottom', C.NULL)
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dx = 150
dy = 400
line(dx, dy - 30, dx, dy + 80.0)
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C.fonsSetAlign(state.fons, C.FONS_ALIGN_LEFT | C.FONS_ALIGN_BASELINE)
C.fonsDrawText(state.fons, dx, dy, c'Left', C.NULL)
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dy += 30
C.fonsSetAlign(state.fons, C.FONS_ALIGN_CENTER | C.FONS_ALIGN_BASELINE)
C.fonsDrawText(state.fons, dx, dy, c'Center', C.NULL)
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dy += 30
C.fonsSetAlign(state.fons, C.FONS_ALIGN_RIGHT | C.FONS_ALIGN_BASELINE)
C.fonsDrawText(state.fons, dx, dy, c'Right', C.NULL)
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C.sfons_flush(state.fons)
}
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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}