v/vlib/gg/gg.v

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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license that can be found in the LICENSE file.
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module gg
import os
import gx
import sokol
import sokol.sapp
import sokol.sgl
import sokol.gfx
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import math
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pub type FNCb = fn (data voidptr)
pub type FNEvent = fn (e &Event, data voidptr)
pub type FNFail = fn (msg string, data voidptr)
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pub type FNKeyDown = fn (c KeyCode, m Modifier, data voidptr)
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pub type FNKeyUp = fn (c KeyCode, m Modifier, data voidptr)
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pub type FNMove = fn (x f32, y f32, data voidptr)
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pub type FNClick = fn (x f32, y f32, button MouseButton, data voidptr)
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pub type FNUnClick = fn (x f32, y f32, button MouseButton, data voidptr)
pub type FNChar = fn (c u32, data voidptr)
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pub struct Event {
pub mut:
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frame_count u64
typ sapp.EventType
key_code KeyCode
char_code u32
key_repeat bool
modifiers u32
mouse_button MouseButton
mouse_x f32
mouse_y f32
mouse_dx f32
mouse_dy f32
scroll_x f32
scroll_y f32
num_touches int
touches [8]C.sapp_touchpoint
window_width int
window_height int
framebuffer_width int
framebuffer_height int
}
pub struct Config {
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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)
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// wait_events bool // set this to true for UIs, to save power
fullscreen bool
scale f32 = 1.0
sample_count int
// ved needs this
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// init_text bool
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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
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native_rendering bool // Cocoa on macOS/iOS, GDI+ on Windows
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}
pub struct PenConfig {
color gx.Color
line_type PenLineType = .solid
thickness int = 1
}
[heap]
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pub struct Context {
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mut:
render_text bool = true
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// a cache with all images created by the user. used for sokol image init and to save space
// (so that the user can store image ids, not entire Image objects)
image_cache []Image
needs_refresh bool = true
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ticks int // for ui mode only
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pub:
native_rendering bool
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pub mut:
scale f32 = 1.0
// will get set to 2.0 for retina, will remain 1.0 for normal
width int
height int
clear_pass C.sg_pass_action
window C.sapp_desc
timage_pip C.sgl_pipeline
config Config
ft &FT
font_inited bool
ui_mode bool // do not redraw everything 60 times/second, but only when the user requests
frame u64 // the current frame counted from the start of the application; always increasing
//
mbtn_mask byte
mouse_buttons MouseButtons // typed version of mbtn_mask; easier to use for user programs
mouse_pos_x int
mouse_pos_y int
mouse_dx int
mouse_dy int
scroll_x int
scroll_y int
//
key_modifiers Modifier
key_repeat bool
pressed_keys [key_code_max]bool
}
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pub struct Size {
pub:
width int
height int
}
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fn gg_init_sokol_window(user_data voidptr) {
mut g := unsafe { &Context(user_data) }
desc := sapp.create_desc()
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/*
desc := C.sg_desc{
mtl_device: sapp.metal_get_device()
mtl_renderpass_descriptor_cb: sapp.metal_get_renderpass_descriptor
mtl_drawable_cb: sapp.metal_get_drawable
d3d11_device: sapp.d3d11_get_device()
d3d11_device_context: sapp.d3d11_get_device_context()
d3d11_render_target_view_cb: sapp.d3d11_get_render_target_view
d3d11_depth_stencil_view_cb: sapp.d3d11_get_depth_stencil_view
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}
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*/
gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{}
sgl.setup(&sgl_desc)
g.scale = dpi_scale()
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// is_high_dpi := sapp.high_dpi()
// fb_w := sapp.width()
// fb_h := sapp.height()
// println('g.scale=$g.scale is_high_dpi=$is_high_dpi fb_w=$fb_w fb_h=$fb_h')
// if g.config.init_text {
// `os.is_file()` won't work on Android if the font file is embedded into the APK
exists := $if !android { os.is_file(g.config.font_path) } $else { true }
if g.config.font_path != '' && !exists {
g.render_text = false
} else if g.config.font_path != '' && exists {
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// t := time.ticks()
g.ft = new_ft(
font_path: g.config.font_path
custom_bold_font_path: g.config.custom_bold_font_path
scale: dpi_scale()
) or { panic(err) }
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// println('FT took ${time.ticks()-t} ms')
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g.font_inited = true
} else {
if g.config.font_bytes_normal.len > 0 {
g.ft = new_ft(
bytes_normal: g.config.font_bytes_normal
bytes_bold: g.config.font_bytes_bold
bytes_mono: g.config.font_bytes_mono
bytes_italic: g.config.font_bytes_italic
scale: sapp.dpi_scale()
) or { panic(err) }
g.font_inited = true
} else {
sfont := system_font_path()
if g.config.font_path != '' {
eprintln('font file "$g.config.font_path" does not exist, the system font ($sfont) was used instead.')
}
g.ft = new_ft(
font_path: sfont
custom_bold_font_path: g.config.custom_bold_font_path
scale: sapp.dpi_scale()
) or { panic(err) }
g.font_inited = true
}
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}
//
mut pipdesc := C.sg_pipeline_desc{
label: c'alpha_image'
}
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
color_state := C.sg_color_state{
blend: C.sg_blend_state{
enabled: true
src_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_SRC_ALPHA)
dst_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA)
}
}
pipdesc.colors[0] = color_state
g.timage_pip = sgl.make_pipeline(&pipdesc)
//
if g.config.init_fn != voidptr(0) {
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g.config.init_fn(g.config.user_data)
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}
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// Create images now that we can do that after sg is inited
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if g.native_rendering {
return
}
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for i in 0 .. g.image_cache.len {
if g.image_cache[i].simg.id == 0 {
g.image_cache[i].init_sokol_image()
}
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}
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}
fn gg_frame_fn(user_data voidptr) {
mut ctx := unsafe { &Context(user_data) }
ctx.frame++
if ctx.config.frame_fn == voidptr(0) {
return
}
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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
}
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}
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
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}
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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) }
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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
g.pressed_keys[key_idx] = e.typ == .key_down
}
if g.config.event_fn != voidptr(0) {
g.config.event_fn(e, g.config.user_data)
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}
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)
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}
}
.quit_requested {
if g.config.quit_fn != voidptr(0) {
g.config.quit_fn(e, g.config.user_data)
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}
}
else {
// dump(e)
}
}
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}
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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)
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}
}
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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)
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} else {
eprintln('gg error: $vmsg')
}
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}
//
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pub fn new_context(cfg Config) &Context {
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mut g := &Context{
width: cfg.width
height: cfg.height
config: cfg
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ft: 0
ui_mode: cfg.ui_mode
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native_rendering: cfg.native_rendering
}
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g.set_bg_color(cfg.bg_color)
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// C.printf('new_context() %p\n', cfg.user_data)
window := C.sapp_desc{
user_data: g
init_userdata_cb: gg_init_sokol_window
frame_userdata_cb: gg_frame_fn
event_userdata_cb: gg_event_fn
fail_userdata_cb: gg_fail_fn
cleanup_userdata_cb: gg_cleanup_fn
window_title: &char(cfg.window_title.str)
html5_canvas_name: &char(cfg.window_title.str)
width: cfg.width
height: cfg.height
sample_count: cfg.sample_count
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high_dpi: true
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fullscreen: cfg.fullscreen
__v_native_render: cfg.native_rendering
}
g.window = window
return g
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}
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pub fn (gg &Context) run() {
sapp.run(&gg.window)
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}
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// 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
}
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pub fn (mut ctx Context) set_bg_color(c gx.Color) {
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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)
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}
// TODO: Fix alpha
pub fn (ctx &Context) draw_rect(x f32, y f32, w f32, h f32, c gx.Color) {
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$if macos {
if ctx.native_rendering {
C.darwin_draw_rect(x, ctx.height - (y + h), w, h, c)
return
}
}
if c.a != 255 {
sgl.load_pipeline(ctx.timage_pip)
}
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sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_quads()
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.end()
}
[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) 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)
}
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sgl.c4b(c.r, c.g, c.b, c.a)
sgl.begin_line_strip()
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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 * 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_line(x f32, y f32, r int, segments int, c gx.Color) {
$if macos {
if ctx.native_rendering {
C.darwin_draw_circle(x - r + 1, ctx.height - (y + r + 3), r, c)
return
}
}
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_line_strip()
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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.end()
}
pub fn (ctx &Context) draw_circle(x f32, y f32, r f32, c gx.Color) {
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ctx.draw_circle_with_segments(x, y, r, 10, c)
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}
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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)
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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()
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for i := 0; i < segments + 1; i++ {
theta = 2.0 * f32(math.pi) * f32(i) / f32(segments)
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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)
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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()
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for i := 0; i < segments + 1; i++ {
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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)
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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()
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for i := 0; i < segments + 1; i++ {
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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()
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}
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pub fn (gg &Context) begin() {
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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)
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}
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pub fn (gg &Context) end() {
gfx.begin_default_pass(gg.clear_pass, sapp.width(), sapp.height())
sgl.draw()
gfx.end_pass()
gfx.commit()
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/*
if gg.config.wait_events {
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// println('gg: waiting')
wait_events()
}
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*/
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}
// resize the context's Window
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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)
}
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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
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}
available -= space
start_x += space
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}
}
sgl.pop_matrix()
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}
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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)
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r := radius * ctx.scale
nx := x * ctx.scale
ny := y * ctx.scale
width := w * ctx.scale
height := h * ctx.scale
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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
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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
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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
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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()
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}
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)
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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]
y0 := points[1]
for i in 1 .. (len / 2 + 1) {
sgl.v2f(x0, y0)
sgl.v2f(points[i * 4 - 2], points[i * 4 - 1])
sgl.v2f(points[i * 4], points[i * 4 + 1])
}
if len % 2 == 0 {
sgl.v2f(points[2 * len - 2], points[2 * len - 1])
}
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], points[2 * i + 1])
}
sgl.v2f(points[0], points[1])
sgl.end()
}
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pub fn screen_size() Size {
$if macos {
return C.gg_get_screen_size()
}
// TODO windows, linux, etc
return Size{}
}
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// 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)}
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}
// 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()
$if android {
s *= android_dpi_scale()
}
// NB: on older X11, `Xft.dpi` from ~/.Xresources, that sokol uses,
// may not be set which leads to sapp.dpi_scale reporting incorrectly 0.0
if s < 0.1 {
s = 1.
}
return s
}
pub fn high_dpi() bool {
return C.sapp_high_dpi()
}
fn C.WaitMessage()
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/*
pub fn wait_events() {
unsafe {
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$if macos {
#NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
#untilDate:[NSDate distantFuture]
#inMode:NSDefaultRunLoopMode
#dequeue:YES];
#[NSApp sendEvent:event];
}
$if windows {
C.WaitMessage()
}
}
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}
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*/