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-rw-r--r--v_windows/v/vlib/gg/gg.v750
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
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+// 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
+}