v / examples / sokol
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1import sokol


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    mut color_action := gfx.ColorAttachmentAction{


18        action: .clear


19        value: gfx.Color{


20            r: 0.3


21            g: 0.3


22            b: 0.32


23            a: 1.0


24        }


25    }


26    mut pass_action := gfx.PassAction{}


27    pass_action.colors[0] = color_action


28    state := &AppState{


29        pass_action: pass_action


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


31    }


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


33    desc := sapp.Desc{


34        user_data: state


35        init_userdata_cb: init


36        frame_userdata_cb: frame


37        window_title: title.str


38        html5_canvas_name: title.str


39    }


40    sapp.run(&desc)


41}


42


43fn init(mut state AppState) {


44    desc := sapp.create_desc()


45    gfx.setup(&desc)


46    s := &sgl.Desc{}


47    sgl.setup(s)


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


49    // or use DroidSerif-Regular.ttf


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


51        'RobotoMono-Regular.ttf')))


52    {


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


54        state.font_normal = state.font_context.add_font_mem('sans', bytes, false)


55    }


56}


57


58fn frame(mut state AppState) {


59    state.render_font()


60    gfx.begin_default_pass(&state.pass_action, sapp.width(), sapp.height())


61    sgl.draw()


62    gfx.end_pass()


63    gfx.commit()


64}


65


66fn (state &AppState) render_font() {


67    mut sx := f32(0.0)


68    mut sy := f32(0.0)


69    mut dx := f32(0.0)


70    mut dy := f32(0.0)


71    lh := f32(0.0)


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


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


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


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


76


77    font_context := state.font_context


78    font_context.clear_state()


79    sgl.defaults()


80    sgl.matrix_mode_projection()


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


82    sx = 0


83    sy = 50


84    dx = sx


85    dy = sy


86    font_context.set_font(state.font_normal)


87    font_context.set_size(100.0)


88    ascender := f32(0.0)


89    descender := f32(0.0)


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


91    dx = sx


92    dy += lh


93    font_context.set_color(white)


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


95    font_context.set_font(state.font_normal)


96    font_context.set_size(48.0)


97    font_context.set_color(brown)


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


99    font_context.set_font(state.font_normal)


100    font_context.set_size(24.0)


101    font_context.set_color(white)


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


103    dx = sx


104    dy += lh * 1.2


105    font_context.set_size(20.0)


106    font_context.set_font(state.font_normal)


107    font_context.set_color(blue)


108    font_context.draw_text(dx, dy, 'Now is the time for all good men to come to the aid of the party.')


109    dx = 300


110    dy = 350


111    font_context.set_alignment(.left | .baseline)


112    font_context.set_size(60.0)


113    font_context.set_font(state.font_normal)


114    font_context.set_color(white)


115    font_context.set_spacing(5.0)


116    font_context.set_blur(6.0)


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


118    dx = 300


119    dy += 50.0


120    font_context.set_size(28.0)


121    font_context.set_font(state.font_normal)


122    font_context.set_color(white)


123    font_context.set_spacing(0.0)


124    font_context.set_blur(3.0)


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


126    font_context.set_color(black)


127    font_context.set_blur(0)


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


129    font_context.set_size(18.0)


130    font_context.set_font(state.font_normal)


131    font_context.set_color(white)


132    dx = 50


133    dy = 350


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


135    font_context.set_alignment(.left | .top)


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


137    dx += 10


138    font_context.set_alignment(.left | .middle)


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


140    dx += 10


141    font_context.set_alignment(.left | .baseline)


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


143    dx += 10


144    font_context.set_alignment(.left | .bottom)


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


146    dx = 150


147    dy = 400


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


149    font_context.set_alignment(.left | .baseline)


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


151    dy += 30


152    font_context.set_alignment(.center | .baseline)


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


154    dy += 30


155    font_context.set_alignment(.right | .baseline)


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


157    sfons.flush(font_context)


158}


159


160fn line(sx f32, sy f32, ex f32, ey f32) {


161    sgl.begin_lines()


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


163    sgl.v2f(sx, sy)


164    sgl.v2f(ex, ey)


165    sgl.end()


166}