Initial project import

tools/v/examples/sokol/fonts.v

@@ -0,0 +1,156 @@
+// vtest build: !solaris
+import sokol.sapp
+import sokol.gfx
+import sokol.sgl
+import fontstash
+import sokol.sfons
+import os
+
+struct AppState {
+mut:
+	pass_action  gfx.PassAction
+	font_context &fontstash.Context
+	font_normal  int
+}
+
+fn main() {
+	state := &AppState{
+		pass_action:  gfx.create_clear_pass_action(0.3, 0.3, 0.32, 1.0)
+		font_context: unsafe { nil } // &fontstash.Context(0)
+	}
+	title := 'V Metal/GL Text Rendering'
+	desc := sapp.Desc{
+		user_data:         state
+		init_userdata_cb:  init
+		frame_userdata_cb: frame
+		window_title:      &char(title.str)
+	}
+	sapp.run(&desc)
+}
+
+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)
+	// 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.clone(), true)
+	}
+}
+
+fn frame(mut state AppState) {
+	state.render_font()
+	pass := sapp.create_default_pass(state.pass_action)
+	gfx.begin_pass(&pass)
+	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()
+	sgl.defaults()
+	sgl.matrix_mode_projection()
+	sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
+	sx = 0
+	sy = 50
+	dx = sx
+	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)
+	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 ')
+	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.')
+	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...')
+	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)
+	dx = 50
+	dy = 350
+	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')
+	dx += 10
+	font_context.set_alignment(.left | .middle)
+	dx = font_context.draw_text(dx, dy, 'Middle')
+	dx += 10
+	font_context.set_alignment(.left | .baseline)
+	dx = font_context.draw_text(dx, dy, 'Baseline')
+	dx += 10
+	font_context.set_alignment(.left | .bottom)
+	font_context.draw_text(dx, dy, 'Bottom')
+	dx = 150
+	dy = 400
+	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')
+	dy += 30
+	font_context.set_alignment(.center | .baseline)
+	font_context.draw_text(dx, dy, 'Center')
+	dy += 30
+	font_context.set_alignment(.right | .baseline)
+	font_context.draw_text(dx, dy, 'Right')
+	sfons.flush(font_context)
+}
+
+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()
+}