v / examples / sokol / fonts.v
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1// vtest build: !solaris


2import sokol.sapp


3import sokol.gfx


4import sokol.sgl


5import fontstash


6import sokol.sfons


7import os


8


9struct AppState {


10mut:


11    pass_action  gfx.PassAction


12    font_context &fontstash.Context


13    font_normal  int


14}


15


16fn main() {


17    state := &AppState{


18        pass_action:  gfx.create_clear_pass_action(0.3, 0.3, 0.32, 1.0)


19        font_context: unsafe { nil } // &fontstash.Context(0)


20    }


21    title := 'V Metal/GL Text Rendering'


22    desc := sapp.Desc{


23        user_data:         state


24        init_userdata_cb:  init


25        frame_userdata_cb: frame


26        window_title:      &char(title.str)


27    }


28    sapp.run(&desc)


29}


30


31fn init(mut state AppState) {


32    desc := sapp.create_desc()


33    gfx.setup(&desc)


34    s := &sgl.Desc{}


35    sgl.setup(s)


36    state.font_context = sfons.create(512, 512, 1)


37    // or use DroidSerif-Regular.ttf


38    if bytes := os.read_bytes(os.resource_abs_path(os.join_path('..', 'assets', 'fonts',


39        'RobotoMono-Regular.ttf')))


40    {


41        println('loaded font: ${bytes.len}')


42        state.font_normal = state.font_context.add_font_mem('sans', bytes.clone(), true)


43    }


44}


45


46fn frame(mut state AppState) {


47    state.render_font()


48    pass := sapp.create_default_pass(state.pass_action)


49    gfx.begin_pass(&pass)


50    sgl.draw()


51    gfx.end_pass()


52    gfx.commit()


53}


54


55fn (state &AppState) render_font() {


56    mut sx := f32(0.0)


57    mut sy := f32(0.0)


58    mut dx := f32(0.0)


59    mut dy := f32(0.0)


60    lh := f32(0.0)


61    white := sfons.rgba(255, 255, 255, 255)


62    black := sfons.rgba(0, 0, 0, 255)


63    brown := sfons.rgba(192, 128, 0, 128)


64    blue := sfons.rgba(0, 192, 255, 255)


65


66    font_context := state.font_context


67    font_context.clear_state()


68    sgl.defaults()


69    sgl.matrix_mode_projection()


70    sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)


71    sx = 0


72    sy = 50


73    dx = sx


74    dy = sy


75    font_context.set_font(state.font_normal)


76    font_context.set_size(100.0)


77    ascender := f32(0.0)


78    descender := f32(0.0)


79    font_context.vert_metrics(&ascender, &descender, &lh)


80    dx = sx


81    dy += lh


82    font_context.set_color(white)


83    dx = font_context.draw_text(dx, dy, 'The quick ')


84    font_context.set_font(state.font_normal)


85    font_context.set_size(48.0)


86    font_context.set_color(brown)


87    dx = font_context.draw_text(dx, dy, 'brown ')


88    font_context.set_font(state.font_normal)


89    font_context.set_size(24.0)


90    font_context.set_color(white)


91    dx = font_context.draw_text(dx, dy, 'fox ')


92    dx = sx


93    dy += lh * 1.2


94    font_context.set_size(20.0)


95    font_context.set_font(state.font_normal)


96    font_context.set_color(blue)


97    font_context.draw_text(dx, dy,


98        'Now is the time for all good men to come to the aid of the party.')


99    dx = 300


100    dy = 350


101    font_context.set_alignment(.left | .baseline)


102    font_context.set_size(60.0)


103    font_context.set_font(state.font_normal)


104    font_context.set_color(white)


105    font_context.set_spacing(5.0)


106    font_context.set_blur(6.0)


107    font_context.draw_text(dx, dy, 'Blurry...')


108    dx = 300


109    dy += 50.0


110    font_context.set_size(28.0)


111    font_context.set_font(state.font_normal)


112    font_context.set_color(white)


113    font_context.set_spacing(0.0)


114    font_context.set_blur(3.0)


115    font_context.draw_text(dx, dy + 2, 'DROP SHADOW')


116    font_context.set_color(black)


117    font_context.set_blur(0)


118    font_context.draw_text(dx, dy, 'DROP SHADOW')


119    font_context.set_size(18.0)


120    font_context.set_font(state.font_normal)


121    font_context.set_color(white)


122    dx = 50


123    dy = 350


124    line(f32(dx - 10), f32(dy), f32(dx + 250), f32(dy))


125    font_context.set_alignment(.left | .top)


126    dx = font_context.draw_text(dx, dy, 'Top')


127    dx += 10


128    font_context.set_alignment(.left | .middle)


129    dx = font_context.draw_text(dx, dy, 'Middle')


130    dx += 10


131    font_context.set_alignment(.left | .baseline)


132    dx = font_context.draw_text(dx, dy, 'Baseline')


133    dx += 10


134    font_context.set_alignment(.left | .bottom)


135    font_context.draw_text(dx, dy, 'Bottom')


136    dx = 150


137    dy = 400


138    line(f32(dx), f32(dy - 30), f32(dx), f32(dy + 80.0))


139    font_context.set_alignment(.left | .baseline)


140    font_context.draw_text(dx, dy, 'Left')


141    dy += 30


142    font_context.set_alignment(.center | .baseline)


143    font_context.draw_text(dx, dy, 'Center')


144    dy += 30


145    font_context.set_alignment(.right | .baseline)


146    font_context.draw_text(dx, dy, 'Right')


147    sfons.flush(font_context)


148}


149


150fn line(sx f32, sy f32, ex f32, ey f32) {


151    sgl.begin_lines()


152    sgl.c4b(255, 255, 0, 128)


153    sgl.v2f(sx, sy)


154    sgl.v2f(ex, ey)


155    sgl.end()


156}


157