153 lines
4.5 KiB
V
153 lines
4.5 KiB
V
import sokol
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import sokol.sapp
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import sokol.gfx
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import sokol.sgl
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import sokol.sfons
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import os
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import time
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const (
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text = '
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Once upon a midnight dreary, while I pondered, weak and weary,
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Over many a quaint and curious volume of forgotten lore—
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While I nodded, nearly napping, suddenly there came a tapping,
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As of some one gently rapping, rapping at my chamber door.
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“’Tis some visitor,” I muttered, “tapping at my chamber door—
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Only this and nothing more.”
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Ah, distinctly I remember it was in the bleak December;
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And each separate dying ember wrought its ghost upon the floor.
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Eagerly I wished the morrow;—vainly I had sought to borrow
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From my books surcease of sorrow—sorrow for the lost Lenore—
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For the rare and radiant maiden whom the angels name Lenore—
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Nameless here for evermore.
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And the silken, sad, uncertain rustling of each purple curtain
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Thrilled me—filled me with fantastic terrors never felt before;
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So that now, to still the beating of my heart, I stood repeating
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“’Tis some visitor entreating entrance at my chamber door—
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Some late visitor entreating entrance at my chamber door;—
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This it is and nothing more.”
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Presently my soul grew stronger; hesitating then no longer,
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“Sir,” said I, “or Madam, truly your forgiveness I implore;
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But the fact is I was napping, and so gently you came rapping,
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And so faintly you came tapping, tapping at my chamber door,
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That I scarce was sure I heard you”—here I opened wide the door;—
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Darkness there and nothing more.
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Deep into that darkness peering, long I stood there wondering, fearing,
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Doubting, dreaming dreams no mortal ever dared to dream before;
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But the silence was unbroken, and the stillness gave no token,
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And the only word there spoken was the whispered word, “Lenore?”
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This I whispered, and an echo murmured back the word, “Lenore!”—
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Merely this and nothing more.
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Back into the chamber turning, all my soul within me burning,
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Soon again I heard a tapping somewhat louder than before.
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“Surely,” said I, “surely that is something at my window lattice;
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Let me see, then, what thereat is, and this mystery explore—
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Let my heart be still a moment and this mystery explore;—
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’Tis the wind and nothing more!”
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'
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lines = text.split('\n')
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)
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struct AppState {
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mut:
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pass_action C.sg_pass_action
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fons &C.FONScontext
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font_normal int
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inited bool
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}
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fn main() {
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mut color_action := C.sg_color_attachment_action{
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action: gfx.Action(C.SG_ACTION_CLEAR)
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}
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color_action.val[0] = 1
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color_action.val[1] = 1
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color_action.val[2] = 1
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color_action.val[3] = 1.0
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mut pass_action := C.sg_pass_action{}
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pass_action.colors[0] = color_action
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state := &AppState{
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pass_action: pass_action
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fons: &C.FONScontext(0)
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}
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title := 'V Metal/GL Text Rendering'
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desc := C.sapp_desc{
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user_data: state
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init_userdata_cb: init
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frame_userdata_cb: frame
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window_title: title.str
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html5_canvas_name: title.str
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width: 600
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height: 700
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high_dpi: true
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}
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sapp.run(&desc)
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}
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fn init(user_data voidptr) {
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mut state := &AppState(user_data)
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desc := sapp.create_desc()
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gfx.setup(&desc)
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s := &C.sgl_desc_t{}
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C.sgl_setup(s)
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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')
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state.font_normal = C.fonsAddFontMem(state.fons, 'sans', bytes.data, bytes.len, false)
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}
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}
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fn frame(user_data voidptr) {
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t := time.ticks()
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mut state := &AppState(user_data)
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state.render_font()
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gfx.begin_default_pass(&state.pass_action, sapp.width(), sapp.height())
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sgl.draw()
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gfx.end_pass()
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gfx.commit()
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println(time.ticks()-t)
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}
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const (
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black = C.sfons_rgba(0, 0, 0, 255)
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)
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fn (mut state AppState) render_font() {
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lh := 30
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mut dy := lh
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if !state.inited {
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state.fons.clear_state()
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sgl.defaults()
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sgl.matrix_mode_projection()
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sgl.ortho(0.0, f32(C.sapp_width()), f32(C.sapp_height()), 0.0, -1.0, 1.0)
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state.fons.set_font(state.font_normal)
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state.fons.set_size(100.0)
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C.fonsSetColor(state.fons, black)
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C.fonsSetFont(state.fons, state.font_normal)
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C.fonsSetSize(state.fons, 35.0)
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state.inited = true
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}
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for line in lines {
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C.fonsDrawText(state.fons, 40, dy, line.str, C.NULL)
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dy += lh
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}
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C.sfons_flush(state.fons)
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}
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fn line(sx f32, sy f32, ex f32, ey f32) {
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sgl.begin_lines()
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sgl.c4b(255, 255, 0, 128)
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sgl.v2f(sx, sy)
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sgl.v2f(ex, ey)
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sgl.end()
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}
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