Adds most of the toolsHEADmaster

1 files changed, 750 insertions, 0 deletions

diff --git a/v_windows/v/vlib/gg/gg.v b/v_windows/v/vlib/gg/gg.v
new file mode 100644
index 0000000..d1dbaa4
--- /dev/null
+++ b/v_windows/v/vlib/gg/gg.v
@@ -0,0 +1,750 @@
+// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
+
+module gg
+
+import gx
+import sokol.sapp
+import sokol.sgl
+import sokol.gfx
+import math
+
+pub type FNCb = fn (data voidptr)
+
+pub type FNEvent = fn (e &Event, data voidptr)
+
+pub type FNFail = fn (msg string, data voidptr)
+
+pub type FNKeyDown = fn (c KeyCode, m Modifier, data voidptr)
+
+pub type FNKeyUp = fn (c KeyCode, m Modifier, data voidptr)
+
+pub type FNMove = fn (x f32, y f32, data voidptr)
+
+pub type FNClick = fn (x f32, y f32, button MouseButton, data voidptr)
+
+pub type FNUnClick = fn (x f32, y f32, button MouseButton, data voidptr)
+
+pub type FNChar = fn (c u32, data voidptr)
+
+pub struct Config {
+pub:
+	width         int
+	height        int
+	use_ortho     bool // unused, still here just for backwards compatibility
+	retina        bool
+	resizable     bool
+	user_data     voidptr
+	font_size     int
+	create_window bool
+	// window_user_ptr voidptr
+	window_title      string
+	borderless_window bool
+	always_on_top     bool
+	bg_color          gx.Color
+	init_fn           FNCb   = voidptr(0)
+	frame_fn          FNCb   = voidptr(0)
+	native_frame_fn   FNCb   = voidptr(0)
+	cleanup_fn        FNCb   = voidptr(0)
+	fail_fn           FNFail = voidptr(0)
+	//
+	event_fn FNEvent = voidptr(0)
+	quit_fn  FNEvent = voidptr(0)
+	//
+	keydown_fn FNKeyDown = voidptr(0)
+	keyup_fn   FNKeyUp   = voidptr(0)
+	char_fn    FNChar    = voidptr(0)
+	//
+	move_fn    FNMove    = voidptr(0)
+	click_fn   FNClick   = voidptr(0)
+	unclick_fn FNUnClick = voidptr(0)
+	leave_fn   FNEvent   = voidptr(0)
+	enter_fn   FNEvent   = voidptr(0)
+	resized_fn FNEvent   = voidptr(0)
+	scroll_fn  FNEvent   = voidptr(0)
+	// wait_events       bool // set this to true for UIs, to save power
+	fullscreen   bool
+	scale        f32 = 1.0
+	sample_count int
+	// ved needs this
+	// init_text bool
+	font_path             string
+	custom_bold_font_path string
+	ui_mode               bool // refreshes only on events to save CPU usage
+	// font bytes for embedding
+	font_bytes_normal []byte
+	font_bytes_bold   []byte
+	font_bytes_mono   []byte
+	font_bytes_italic []byte
+	native_rendering  bool // Cocoa on macOS/iOS, GDI+ on Windows
+}
+
+pub struct PenConfig {
+	color     gx.Color
+	line_type PenLineType = .solid
+	thickness int = 1
+}
+
+pub struct Size {
+pub:
+	width  int
+	height int
+}
+
+fn gg_frame_fn(user_data voidptr) {
+	mut ctx := unsafe { &Context(user_data) }
+	ctx.frame++
+	if ctx.config.frame_fn == voidptr(0) {
+		return
+	}
+	if ctx.native_rendering {
+		// return
+	}
+
+	if ctx.ui_mode && !ctx.needs_refresh {
+		// Draw 3 more frames after the "stop refresh" command
+		ctx.ticks++
+		if ctx.ticks > 3 {
+			return
+		}
+	}
+	ctx.config.frame_fn(ctx.config.user_data)
+	ctx.needs_refresh = false
+}
+
+pub fn (mut ctx Context) refresh_ui() {
+	ctx.needs_refresh = true
+	ctx.ticks = 0
+}
+
+fn gg_event_fn(ce &C.sapp_event, user_data voidptr) {
+	// e := unsafe { &sapp.Event(ce) }
+	mut e := unsafe { &Event(ce) }
+	mut g := unsafe { &Context(user_data) }
+	if g.ui_mode {
+		g.refresh_ui()
+	}
+	if e.typ == .mouse_down {
+		bitplace := int(e.mouse_button)
+		g.mbtn_mask |= byte(1 << bitplace)
+		g.mouse_buttons = MouseButtons(g.mbtn_mask)
+	}
+	if e.typ == .mouse_up {
+		bitplace := int(e.mouse_button)
+		g.mbtn_mask &= ~(byte(1 << bitplace))
+		g.mouse_buttons = MouseButtons(g.mbtn_mask)
+	}
+	if e.typ == .mouse_move && e.mouse_button == .invalid {
+		if g.mbtn_mask & 0x01 > 0 {
+			e.mouse_button = .left
+		}
+		if g.mbtn_mask & 0x02 > 0 {
+			e.mouse_button = .right
+		}
+		if g.mbtn_mask & 0x04 > 0 {
+			e.mouse_button = .middle
+		}
+	}
+	g.mouse_pos_x = int(e.mouse_x / g.scale)
+	g.mouse_pos_y = int(e.mouse_y / g.scale)
+	g.mouse_dx = int(e.mouse_dx / g.scale)
+	g.mouse_dy = int(e.mouse_dy / g.scale)
+	g.scroll_x = int(e.scroll_x / g.scale)
+	g.scroll_y = int(e.scroll_y / g.scale)
+	g.key_modifiers = Modifier(e.modifiers)
+	g.key_repeat = e.key_repeat
+	if e.typ in [.key_down, .key_up] {
+		key_idx := int(e.key_code) % key_code_max
+		prev := g.pressed_keys[key_idx]
+		next := e.typ == .key_down
+		g.pressed_keys[key_idx] = next
+		g.pressed_keys_edge[key_idx] = prev != next
+	}
+	if g.config.event_fn != voidptr(0) {
+		g.config.event_fn(e, g.config.user_data)
+	}
+	match e.typ {
+		.mouse_move {
+			if g.config.move_fn != voidptr(0) {
+				g.config.move_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, g.config.user_data)
+			}
+		}
+		.mouse_down {
+			if g.config.click_fn != voidptr(0) {
+				g.config.click_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, e.mouse_button,
+					g.config.user_data)
+			}
+		}
+		.mouse_up {
+			if g.config.unclick_fn != voidptr(0) {
+				g.config.unclick_fn(e.mouse_x / g.scale, e.mouse_y / g.scale, e.mouse_button,
+					g.config.user_data)
+			}
+		}
+		.mouse_leave {
+			if g.config.leave_fn != voidptr(0) {
+				g.config.leave_fn(e, g.config.user_data)
+			}
+		}
+		.mouse_enter {
+			if g.config.enter_fn != voidptr(0) {
+				g.config.enter_fn(e, g.config.user_data)
+			}
+		}
+		.mouse_scroll {
+			if g.config.scroll_fn != voidptr(0) {
+				g.config.scroll_fn(e, g.config.user_data)
+			}
+		}
+		.key_down {
+			if g.config.keydown_fn != voidptr(0) {
+				g.config.keydown_fn(e.key_code, Modifier(e.modifiers), g.config.user_data)
+			}
+		}
+		.key_up {
+			if g.config.keyup_fn != voidptr(0) {
+				g.config.keyup_fn(e.key_code, Modifier(e.modifiers), g.config.user_data)
+			}
+		}
+		.char {
+			if g.config.char_fn != voidptr(0) {
+				g.config.char_fn(e.char_code, g.config.user_data)
+			}
+		}
+		.resized {
+			if g.config.resized_fn != voidptr(0) {
+				g.config.resized_fn(e, g.config.user_data)
+			}
+		}
+		.quit_requested {
+			if g.config.quit_fn != voidptr(0) {
+				g.config.quit_fn(e, g.config.user_data)
+			}
+		}
+		else {
+			// dump(e)
+		}
+	}
+}
+
+fn gg_cleanup_fn(user_data voidptr) {
+	mut g := unsafe { &Context(user_data) }
+	if g.config.cleanup_fn != voidptr(0) {
+		g.config.cleanup_fn(g.config.user_data)
+	}
+}
+
+fn gg_fail_fn(msg &char, user_data voidptr) {
+	mut g := unsafe { &Context(user_data) }
+	vmsg := unsafe { tos3(msg) }
+	if g.config.fail_fn != voidptr(0) {
+		g.config.fail_fn(vmsg, g.config.user_data)
+	} else {
+		eprintln('gg error: $vmsg')
+	}
+}
+
+pub fn (gg &Context) run() {
+	sapp.run(&gg.window)
+}
+
+// quit closes the context window and exits the event loop for it
+pub fn (ctx &Context) quit() {
+	sapp.request_quit() // does not require ctx right now, but sokol multi-window might in the future
+}
+
+pub fn (mut ctx Context) set_bg_color(c gx.Color) {
+	ctx.clear_pass = gfx.create_clear_pass(f32(c.r) / 255.0, f32(c.g) / 255.0, f32(c.b) / 255.0,
+		f32(c.a) / 255.0)
+}
+
+[inline]
+pub fn (ctx &Context) draw_square(x f32, y f32, s f32, c gx.Color) {
+	ctx.draw_rect(x, y, s, s, c)
+}
+
+[inline]
+pub fn (ctx &Context) set_pixel(x f32, y f32, c gx.Color) {
+	ctx.draw_square(x, y, 1, c)
+}
+
+pub fn (ctx &Context) set_pixels(points []f32, c gx.Color) {
+	assert points.len % 2 == 0
+	len := points.len / 2
+
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	sgl.begin_quads()
+	for i in 0 .. len {
+		x, y := points[i * 2], points[i * 2 + 1]
+
+		sgl.v2f(x * ctx.scale, y * ctx.scale)
+		sgl.v2f((x + 1) * ctx.scale, y * ctx.scale)
+		sgl.v2f((x + 1) * ctx.scale, (y + 1) * ctx.scale)
+		sgl.v2f(x * ctx.scale, (y + 1) * ctx.scale)
+	}
+	sgl.end()
+}
+
+pub fn (ctx &Context) draw_triangle(x f32, y f32, x2 f32, y2 f32, x3 f32, y3 f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	sgl.begin_quads()
+	sgl.v2f(x * ctx.scale, y * ctx.scale)
+	sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
+	sgl.v2f(x3 * ctx.scale, y3 * ctx.scale)
+	sgl.end()
+}
+
+pub fn (ctx &Context) draw_empty_rect(x f32, y f32, w f32, h f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	sgl.begin_line_strip()
+	sgl.v2f(x * ctx.scale, y * ctx.scale)
+	sgl.v2f((x + w) * ctx.scale, y * ctx.scale)
+	sgl.v2f((x + w) * ctx.scale, (y + h) * ctx.scale)
+	sgl.v2f(x * ctx.scale, (y + h) * ctx.scale)
+	sgl.v2f(x * ctx.scale, (y - 1) * ctx.scale)
+	sgl.end()
+}
+
+[inline]
+pub fn (ctx &Context) draw_empty_square(x f32, y f32, s f32, c gx.Color) {
+	ctx.draw_empty_rect(x, y, s, s, c)
+}
+
+pub fn (ctx &Context) draw_circle(x f32, y f32, r f32, c gx.Color) {
+	ctx.draw_circle_with_segments(x, y, r, 10, c)
+}
+
+pub fn (ctx &Context) draw_circle_with_segments(x f32, y f32, r f32, segments int, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	nr := r * ctx.scale
+	mut theta := f32(0)
+	mut xx := f32(0)
+	mut yy := f32(0)
+	sgl.begin_triangle_strip()
+	for i := 0; i < segments + 1; i++ {
+		theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
+		xx = nr * math.cosf(theta)
+		yy = nr * math.sinf(theta)
+		sgl.v2f(xx + nx, yy + ny)
+		sgl.v2f(nx, ny)
+	}
+	sgl.end()
+}
+
+pub fn (ctx &Context) draw_arc_line(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	theta := f32(arc_angle / f32(segments))
+	tan_factor := math.tanf(theta)
+	rad_factor := math.cosf(theta)
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	mut xx := f32(r * math.cosf(start_angle))
+	mut yy := f32(r * math.sinf(start_angle))
+	sgl.begin_line_strip()
+	for i := 0; i < segments + 1; i++ {
+		sgl.v2f(xx + nx, yy + ny)
+		tx := -yy
+		ty := xx
+		xx += tx * tan_factor
+		yy += ty * tan_factor
+		xx *= rad_factor
+		yy *= rad_factor
+	}
+	sgl.end()
+}
+
+pub fn (ctx &Context) draw_arc(x f32, y f32, r int, start_angle f32, arc_angle f32, segments int, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	theta := f32(arc_angle / f32(segments))
+	tan_factor := math.tanf(theta)
+	rad_factor := math.cosf(theta)
+	mut xx := f32(r * math.cosf(start_angle))
+	mut yy := f32(r * math.sinf(start_angle))
+	sgl.begin_triangle_strip()
+	for i := 0; i < segments + 1; i++ {
+		sgl.v2f(xx + nx, yy + ny)
+		sgl.v2f(nx, ny)
+		tx := -yy
+		ty := xx
+		xx += tx * tan_factor
+		yy += ty * tan_factor
+		xx *= rad_factor
+		yy *= rad_factor
+	}
+	sgl.end()
+}
+
+pub fn (gg &Context) begin() {
+	if gg.render_text && gg.font_inited {
+		gg.ft.flush()
+	}
+	sgl.defaults()
+	sgl.matrix_mode_projection()
+	sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
+}
+
+pub fn (gg &Context) end() {
+	gfx.begin_default_pass(gg.clear_pass, sapp.width(), sapp.height())
+	sgl.draw()
+	gfx.end_pass()
+	gfx.commit()
+	/*
+	if gg.config.wait_events {
+		// println('gg: waiting')
+		wait_events()
+	}
+	*/
+}
+
+// resize the context's Window
+pub fn (mut ctx Context) resize(width int, height int) {
+	ctx.width = width
+	ctx.height = height
+}
+
+// draw_line draws a line between the points provided
+pub fn (ctx &Context) draw_line(x f32, y f32, x2 f32, y2 f32, c gx.Color) {
+	$if macos {
+		if ctx.native_rendering {
+			// Make the line more clear on hi dpi screens: draw a rectangle
+			mut width := math.abs(x2 - x)
+			mut height := math.abs(y2 - y)
+			if width == 0 {
+				width = 1
+			} else if height == 0 {
+				height = 1
+			}
+			ctx.draw_rect(x, y, f32(width), f32(height), c)
+			return
+		}
+	}
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+	sgl.begin_line_strip()
+	sgl.v2f(x * ctx.scale, y * ctx.scale)
+	sgl.v2f(x2 * ctx.scale, y2 * ctx.scale)
+	sgl.end()
+}
+
+// draw_line_with_config draws a line between the points provided with the PenConfig
+pub fn (ctx &Context) draw_line_with_config(x f32, y f32, x2 f32, y2 f32, config PenConfig) {
+	if config.color.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+
+	if config.thickness <= 0 {
+		return
+	}
+
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	nx2 := x2 * ctx.scale
+	ny2 := y2 * ctx.scale
+
+	dx := nx2 - nx
+	dy := ny2 - ny
+	length := math.sqrtf(math.powf(x2 - x, 2) + math.powf(y2 - y, 2))
+	theta := f32(math.atan2(dy, dx))
+
+	sgl.push_matrix()
+
+	sgl.translate(nx, ny, 0)
+	sgl.rotate(theta, 0, 0, 1)
+	sgl.translate(-nx, -ny, 0)
+
+	if config.line_type == .solid {
+		ctx.draw_rect(x, y, length, config.thickness, config.color)
+	} else {
+		size := if config.line_type == .dotted { config.thickness } else { config.thickness * 3 }
+		space := if size == 1 { 2 } else { size }
+
+		mut available := length
+		mut start_x := x
+
+		for i := 0; available > 0; i++ {
+			if i % 2 == 0 {
+				ctx.draw_rect(start_x, y, size, config.thickness, config.color)
+				available -= size
+				start_x += size
+				continue
+			}
+
+			available -= space
+			start_x += space
+		}
+	}
+
+	sgl.pop_matrix()
+}
+
+pub fn (ctx &Context) draw_rounded_rect(x f32, y f32, w f32, h f32, radius f32, color gx.Color) {
+	sgl.c4b(color.r, color.g, color.b, color.a)
+	sgl.begin_triangle_strip()
+	mut theta := f32(0)
+	mut xx := f32(0)
+	mut yy := f32(0)
+	r := radius * ctx.scale
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	width := w * ctx.scale
+	height := h * ctx.scale
+	segments := 2 * math.pi * r
+	segdiv := segments / 4
+	rb := 0
+	lb := int(rb + segdiv)
+	lt := int(lb + segdiv)
+	rt := int(lt + segdiv)
+	// left top
+	lx := nx + r
+	ly := ny + r
+	for i in lt .. rt {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + lx, yy + ly)
+		sgl.v2f(lx, ly)
+	}
+	// right top
+	mut rx := nx + width - r
+	mut ry := ny + r
+	for i in rt .. int(segments) {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + rx, yy + ry)
+		sgl.v2f(rx, ry)
+	}
+	// right bottom
+	mut rbx := rx
+	mut rby := ny + height - r
+	for i in rb .. lb {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + rbx, yy + rby)
+		sgl.v2f(rbx, rby)
+	}
+	// left bottom
+	mut lbx := lx
+	mut lby := ny + height - r
+	for i in lb .. lt {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + lbx, yy + lby)
+		sgl.v2f(lbx, lby)
+	}
+	sgl.v2f(lx + xx, ly)
+	sgl.v2f(lx, ly)
+	sgl.end()
+	sgl.begin_quads()
+	sgl.v2f(lx, ly)
+	sgl.v2f(rx, ry)
+	sgl.v2f(rbx, rby)
+	sgl.v2f(lbx, lby)
+	sgl.end()
+}
+
+pub fn (ctx &Context) draw_empty_rounded_rect(x f32, y f32, w f32, h f32, radius f32, border_color gx.Color) {
+	mut theta := f32(0)
+	mut xx := f32(0)
+	mut yy := f32(0)
+	r := radius * ctx.scale
+	nx := x * ctx.scale
+	ny := y * ctx.scale
+	width := w * ctx.scale
+	height := h * ctx.scale
+	segments := 2 * math.pi * r
+	segdiv := segments / 4
+	rb := 0
+	lb := int(rb + segdiv)
+	lt := int(lb + segdiv)
+	rt := int(lt + segdiv)
+	sgl.c4b(border_color.r, border_color.g, border_color.b, border_color.a)
+	sgl.begin_line_strip()
+	// left top
+	lx := nx + r
+	ly := ny + r
+	for i in lt .. rt {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + lx, yy + ly)
+	}
+	// right top
+	mut rx := nx + width - r
+	mut ry := ny + r
+	for i in rt .. int(segments) {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + rx, yy + ry)
+	}
+	// right bottom
+	mut rbx := rx
+	mut rby := ny + height - r
+	for i in rb .. lb {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + rbx, yy + rby)
+	}
+	// left bottom
+	mut lbx := lx
+	mut lby := ny + height - r
+	for i in lb .. lt {
+		theta = 2 * f32(math.pi) * f32(i) / segments
+		xx = r * math.cosf(theta)
+		yy = r * math.sinf(theta)
+		sgl.v2f(xx + lbx, yy + lby)
+	}
+	sgl.v2f(lx + xx, ly)
+	sgl.end()
+}
+
+// draw_convex_poly draws a convex polygon, given an array of points, and a color.
+// Note that the points must be given in clockwise order.
+pub fn (ctx &Context) draw_convex_poly(points []f32, c gx.Color) {
+	assert points.len % 2 == 0
+	len := points.len / 2
+	assert len >= 3
+
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+
+	sgl.begin_triangle_strip()
+	x0 := points[0] * ctx.scale
+	y0 := points[1] * ctx.scale
+	for i in 1 .. (len / 2 + 1) {
+		sgl.v2f(x0, y0)
+		sgl.v2f(points[i * 4 - 2] * ctx.scale, points[i * 4 - 1] * ctx.scale)
+		sgl.v2f(points[i * 4] * ctx.scale, points[i * 4 + 1] * ctx.scale)
+	}
+
+	if len % 2 == 0 {
+		sgl.v2f(points[2 * len - 2] * ctx.scale, points[2 * len - 1] * ctx.scale)
+	}
+	sgl.end()
+}
+
+// draw_empty_poly - draws the borders of a polygon, given an array of points, and a color.
+// Note that the points must be given in clockwise order.
+pub fn (ctx &Context) draw_empty_poly(points []f32, c gx.Color) {
+	assert points.len % 2 == 0
+	len := points.len / 2
+	assert len >= 3
+
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+
+	sgl.begin_line_strip()
+	for i in 0 .. len {
+		sgl.v2f(points[2 * i] * ctx.scale, points[2 * i + 1] * ctx.scale)
+	}
+	sgl.v2f(points[0] * ctx.scale, points[1] * ctx.scale)
+	sgl.end()
+}
+
+// draw_cubic_bezier draws a cubic Bézier curve, also known as a spline, from four points.
+// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
+// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
+// Please see `draw_cubic_bezier_in_steps` to control the amount of steps (segments) used to draw the curve.
+pub fn (ctx &Context) draw_cubic_bezier(points []f32, c gx.Color) {
+	ctx.draw_cubic_bezier_in_steps(points, u32(30 * ctx.scale), c)
+}
+
+// draw_cubic_bezier_in_steps draws a cubic Bézier curve, also known as a spline, from four points.
+// The smoothness of the curve can be controlled with the `steps` parameter. `steps` determines how many iterations is
+// taken to draw the curve.
+// The four points is provided as one `points` array which contains a stream of point pairs (x and y coordinates).
+// Thus a cubic Bézier could be declared as: `points := [x1, y1, control_x1, control_y1, control_x2, control_y2, x2, y2]`.
+pub fn (ctx &Context) draw_cubic_bezier_in_steps(points []f32, steps u32, c gx.Color) {
+	assert steps > 0
+	assert points.len == 8
+
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
+	sgl.c4b(c.r, c.g, c.b, c.a)
+
+	sgl.begin_line_strip()
+
+	p1_x, p1_y := points[0], points[1]
+	p2_x, p2_y := points[6], points[7]
+
+	ctrl_p1_x, ctrl_p1_y := points[2], points[3]
+	ctrl_p2_x, ctrl_p2_y := points[4], points[5]
+
+	// The constant 3 is actually points.len() - 1;
+
+	step := f32(1.0) / steps
+	sgl.v2f(p1_x * ctx.scale, p1_y * ctx.scale)
+	for u := f32(0.0); u <= f32(1.0); u += step {
+		pow_2_u := u * u
+		pow_3_u := pow_2_u * u
+
+		x := pow_3_u * (p2_x + 3 * (ctrl_p1_x - ctrl_p2_x) - p1_x) +
+			3 * pow_2_u * (p1_x - 2 * ctrl_p1_x + ctrl_p2_x) + 3 * u * (ctrl_p1_x - p1_x) + p1_x
+
+		y := pow_3_u * (p2_y + 3 * (ctrl_p1_y - ctrl_p2_y) - p1_y) +
+			3 * pow_2_u * (p1_y - 2 * ctrl_p1_y + ctrl_p2_y) + 3 * u * (ctrl_p1_y - p1_y) + p1_y
+
+		sgl.v2f(x * ctx.scale, y * ctx.scale)
+	}
+	sgl.v2f(p2_x * ctx.scale, p2_y * ctx.scale)
+
+	sgl.end()
+}
+
+// window_size returns the `Size` of the active window
+pub fn window_size() Size {
+	s := dpi_scale()
+	return Size{int(sapp.width() / s), int(sapp.height() / s)}
+}
+
+// window_size_real_pixels returns the `Size` of the active window without scale
+pub fn window_size_real_pixels() Size {
+	return Size{sapp.width(), sapp.height()}
+}
+
+pub fn dpi_scale() f32 {
+	mut s := sapp.dpi_scale()
+	$if android {
+		s *= android_dpi_scale()
+	}
+	// NB: on older X11, `Xft.dpi` from ~/.Xresources, that sokol uses,
+	// may not be set which leads to sapp.dpi_scale reporting incorrectly 0.0
+	if s < 0.1 {
+		s = 1.0
+	}
+	return s
+}