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v/vlib/gg/gg.v

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V

// 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 os
import gx
import sokol
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 Event {
pub mut:
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 {
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
}
[heap]
pub struct Context {
mut:
render_text bool = true
// 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
ticks int // for ui mode only
pub:
native_rendering bool
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
}
pub struct Size {
pub:
width int
height int
}
fn gg_init_sokol_window(user_data voidptr) {
mut g := unsafe { &Context(user_data) }
desc := sapp.create_desc()
/*
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
}
*/
gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{}
sgl.setup(&sgl_desc)
g.scale = dpi_scale()
// 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 {
// 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) }
// println('FT took ${time.ticks()-t} ms')
g.font_inited = true
} else {
if g.config.font_bytes_normal.len > 0 {
g.ft = new_ft(
bytes_normal: g.config.font_bytes_normal
bytes_bold: g.config.font_bytes_bold
bytes_mono: g.config.font_bytes_mono
bytes_italic: g.config.font_bytes_italic
scale: sapp.dpi_scale()
) or { panic(err) }
g.font_inited = true
} else {
sfont := system_font_path()
if g.config.font_path != '' {
eprintln('font file "$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
}
}
//
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) {
g.config.init_fn(g.config.user_data)
}
// Create images now that we can do that after sg is inited
if g.native_rendering {
return
}
for i in 0 .. g.image_cache.len {
if g.image_cache[i].simg.id == 0 {
g.image_cache[i].init_sokol_image()
}
}
}
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
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)
}
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 new_context(cfg Config) &Context {
mut g := &Context{
width: cfg.width
height: cfg.height
config: cfg
ft: 0
ui_mode: cfg.ui_mode
native_rendering: cfg.native_rendering
}
g.set_bg_color(cfg.bg_color)
// 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
high_dpi: true
fullscreen: cfg.fullscreen
__v_native_render: cfg.native_rendering
}
g.window = window
return g
}
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)
}
// TODO: Fix alpha
pub fn (ctx &Context) draw_rect(x f32, y f32, w f32, h f32, c gx.Color) {
$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)
}
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)
}
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 * 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()
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) {
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 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]
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()
}
pub fn screen_size() Size {
$if macos {
return C.gg_get_screen_size()
}
// TODO windows, linux, etc
return Size{}
}
// 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.
}
return s
}
pub fn high_dpi() bool {
return C.sapp_high_dpi()
}
fn C.WaitMessage()
/*
pub fn wait_events() {
unsafe {
$if macos {
#NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
#untilDate:[NSDate distantFuture]
#inMode:NSDefaultRunLoopMode
#dequeue:YES];
#[NSApp sendEvent:event];
}
$if windows {
C.WaitMessage()
}
}
}
*/