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WIP: attempt to improve text rendering

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This commit is contained in:
Edward R. Gonzalez
2024-12-29 10:20:06 -05:00
parent 292d1b58b5
commit 7eab6f9a7f
16 changed files with 145 additions and 69 deletions
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assets/CozetteVector.ttf
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assets/FiraCousine-Regular.ttf
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assets/RecMonoLinear-Regular-1.084.ttf
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assets/Roboto-Regular.ttf
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assets/neodgm_code.ttf
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code/font/vefontcache/atlas.odin
+4 -3
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@@ -27,7 +27,8 @@ Atlas :: struct {
width : i32,
height : i32,
glyph_padding : i32,
glyph_padding : i32, // Padding to add to bounds_<width/height>_scaled for choosing which atlas region.
glyph_over_scalar : f32, // Scalar to apply to bounds_<width/height>_scaled for choosing which atlas region.
region_a : Atlas_Region,
region_b : Atlas_Region,
@@ -98,8 +99,8 @@ decide_codepoint_region :: proc(ctx : ^Context, entry : ^Entry, glyph_index : Gl
glyph_buffer := & ctx.glyph_buffer
glyph_padding := f32( atlas.glyph_padding ) * 2
bounds_width_scaled := i32(bounds_width * entry.size_scale + glyph_padding)
bounds_height_scaled := i32(bounds_height * entry.size_scale + glyph_padding)
bounds_width_scaled := i32(bounds_width * entry.size_scale * atlas.glyph_over_scalar + glyph_padding)
bounds_height_scaled := i32(bounds_height * entry.size_scale * atlas.glyph_over_scalar + glyph_padding)
// Use a lookup table for faster region selection
region_lookup := [4]struct { kind: Atlas_Region_Kind, region: ^Atlas_Region } {
code/font/vefontcache/draw.odin
+5 -4
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@@ -174,9 +174,9 @@ cache_glyph_freetype :: proc(ctx: ^Context, font: Font_ID, glyph_index: Glyph, e
start_index: int = 0
for contour_index in 0 ..< int(outline.n_contours)
{
end_index := int(contours[contour_index]) + 1
prev_point: Vec2
first_point: Vec2
end_index := int(contours[contour_index]) + 1
prev_point : Vec2
first_point : Vec2
for idx := start_index; idx < end_index; idx += 1
{
@@ -766,7 +766,8 @@ merge_draw_list :: proc( dst, src : ^Draw_List )
}
}
optimize_draw_list :: proc(draw_list: ^Draw_List, call_offset: int) {
optimize_draw_list :: proc(draw_list: ^Draw_List, call_offset: int)
{
// profile(#procedure)
assert(draw_list != nil)
code/font/vefontcache/shaped_text.odin
+4 -7
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@@ -76,7 +76,7 @@ shape_text_uncached :: proc( ctx : ^Context, font : Font_ID, text_utf8 : string,
if ctx.text_shape_adv
{
shaper_shape_from_text( & ctx.shaper_ctx, & entry.shaper_info, output, text_utf8, ascent_i32, descent_i32, line_gap_i32, entry.size, entry.size_scale )
shaper_shape_from_text( & ctx.shaper_ctx, ctx.snap_shape_pos, & entry.shaper_info, output, text_utf8, ascent_i32, descent_i32, line_gap_i32, entry.size, entry.size_scale )
return
}
else
@@ -107,21 +107,18 @@ shape_text_uncached :: proc( ctx : ^Context, font : Font_ID, text_utf8 : string,
continue
}
if abs( entry.size ) <= ADVANCE_SNAP_SMALLFONT_SIZE {
position.x = position.x
position.x = ceil(position.x)
}
append( & output.glyphs, parser_find_glyph_index( & entry.parser_info, codepoint ))
advance, _ := parser_get_codepoint_horizontal_metrics( & entry.parser_info, codepoint )
if ctx.snap_shape_pos do position.x = ceil(position.x)
append( & output.positions, Vec2 {
position.x,
position.y
floor(position.x),
floor(position.y)
})
position.x += f32(advance) * entry.size_scale
if ctx.snap_shape_pos do position.x = ceil(position.x)
prev_codepoint = codepoint
}
code/font/vefontcache/shaper.odin
+18 -9
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@@ -13,6 +13,9 @@ Shaper_Kind :: enum {
Shaper_Context :: struct {
hb_buffer : harfbuzz.Buffer,
snap_glyph_pos : b32,
adv_snap_small_font_threshold : u32,
}
Shaper_Info :: struct {
@@ -51,7 +54,7 @@ shaper_unload_font :: proc( ctx : ^Shaper_Info )
if blob != nil do harfbuzz.blob_destroy( blob )
}
shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, output :^Shaped_Text, text_utf8 : string,
shaper_shape_from_text :: proc( ctx : ^Shaper_Context, snap_shape_pos : b32, info : ^Shaper_Info, output :^Shaped_Text, text_utf8 : string,
ascent, descent, line_gap : i32, size, size_scale : f32 )
{
// profile(#procedure)
@@ -71,7 +74,8 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
position, vertical_position : f32
shape_run :: proc( buffer : harfbuzz.Buffer, script : harfbuzz.Script, font : harfbuzz.Font, output : ^Shaped_Text,
position, vertical_position, max_line_width: ^f32, line_count: ^int,
ascent, descent, line_gap, size, size_scale: f32 )
ascent, descent, line_gap, size, size_scale: f32,
snap_shape_pos : b32 )
{
// Set script and direction. We use the system's default langauge.
// script = HB_SCRIPT_LATIN
@@ -101,7 +105,7 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
(max_line_width^) = max( max_line_width^, position^ )
(position^) = 0.0
(vertical_position^) -= line_height
(vertical_position^) = cast(f32) i32(vertical_position^ + 0.5)
(vertical_position^) = vertical_position^
(line_count^) += 1
continue
}
@@ -112,13 +116,18 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
append( & output.glyphs, glyph_id )
pos := position^
pos := position^
v_pos := vertical_position^
offset_x := f32(hb_gposition.x_offset) * size_scale
offset_y := f32(hb_gposition.y_offset) * size_scale
append( & output.positions, Vec2 { cast(f32) i32( pos + offset_x + 0.5 ),
v_pos + offset_y,
})
pos += offset_x
v_pos += offset_y
if snap_shape_pos {
pos = floor(pos)
v_pos = floor(v_pos)
}
append( & output.positions, Vec2 {pos, v_pos})
(position^) += f32(hb_gposition.x_advance) * size_scale
(vertical_position^) += f32(hb_gposition.y_advance) * size_scale
@@ -151,13 +160,13 @@ shaper_shape_from_text :: proc( ctx : ^Shaper_Context, info : ^Shaper_Info, outp
}
// End current run since we've encountered a script change.
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale )
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale, snap_shape_pos )
harfbuzz.buffer_add( ctx.hb_buffer, hb_codepoint, codepoint == '\n' ? 1 : 0 )
current_script = script
}
// End the last run if needed
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale )
shape_run( ctx.hb_buffer, current_script, info.font, output, & position, & vertical_position, & max_line_width, & line_count, ascent, descent, line_gap, size, size_scale, snap_shape_pos )
// Set the final size
output.size.x = max_line_width
code/font/vefontcache/vefontcache.odin
+17 -17
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@@ -7,7 +7,7 @@ package vefontcache
import "base:runtime"
ADVANCE_SNAP_SMALLFONT_SIZE :: 0
ADVANCE_SNAP_SMALLFONT_SIZE :: 10
Font_ID :: distinct i64
Glyph :: distinct i32
@@ -44,7 +44,6 @@ Context :: struct {
snap_width : f32,
snap_height : f32,
colour : Colour,
cursor_pos : Vec2,
@@ -75,9 +74,10 @@ Init_Atlas_Region_Params :: struct {
}
Init_Atlas_Params :: struct {
width : u32,
height : u32,
glyph_padding : u32,
width : u32,
height : u32,
glyph_padding : u32, // Padding to add to bounds_<width/height>_scaled for choosing which atlas region.
glyph_over_scalar : f32, // Scalar to apply to bounds_<width/height>_scaled for choosing which atlas region.
region_a : Init_Atlas_Region_Params,
region_b : Init_Atlas_Region_Params,
@@ -86,9 +86,10 @@ Init_Atlas_Params :: struct {
}
Init_Atlas_Params_Default :: Init_Atlas_Params {
width = 4096,
height = 2048,
glyph_padding = 4,
width = 4096,
height = 2048,
glyph_padding = 1,
glyph_over_scalar = 1,
region_a = {
width = 32,
@@ -115,7 +116,7 @@ Init_Glyph_Draw_Params :: struct {
}
Init_Glyph_Draw_Params_Default :: Init_Glyph_Draw_Params {
over_sample = { 16, 16 },
over_sample = { 4, 4 },
buffer_batch = 4,
draw_padding = Init_Atlas_Params_Default.glyph_padding,
}
@@ -138,7 +139,7 @@ startup :: proc( ctx : ^Context, parser_kind : Parser_Kind = .STB_TrueType,
shape_cache_params := Init_Shape_Cache_Params_Default,
use_advanced_text_shaper : b32 = true,
snap_shape_position : b32 = true,
default_curve_quality : u32 = 6,
default_curve_quality : u32 = 3,
entires_reserve : u32 = 512,
temp_path_reserve : u32 = 1024,
temp_codepoint_seen_reserve : u32 = 2048,
@@ -202,9 +203,10 @@ startup :: proc( ctx : ^Context, parser_kind : Parser_Kind = .STB_TrueType,
init_atlas_region( & atlas.region_c, atlas_params, atlas_params.region_c, { 4, 1}, 512 )
init_atlas_region( & atlas.region_d, atlas_params, atlas_params.region_d, { 2, 1}, 256 )
atlas.width = i32(atlas_params.width)
atlas.height = i32(atlas_params.height)
atlas.glyph_padding = i32(atlas_params.glyph_padding)
atlas.width = i32(atlas_params.width)
atlas.height = i32(atlas_params.height)
atlas.glyph_padding = i32(atlas_params.glyph_padding)
atlas.glyph_over_scalar = atlas_params.glyph_over_scalar
atlas.region_a.offset = {0, 0}
atlas.region_b.offset.x = 0
@@ -385,10 +387,8 @@ load_font :: proc( ctx : ^Context, label : string, data : []byte, size_px : f32,
parser_info = parser_load_font( & parser_ctx, label, data )
shaper_info = shaper_load_font( & shaper_ctx, label, data, transmute(rawptr) id )
size = size_px
size_scale = size_px < 0.0 ? \
parser_scale_for_pixel_height( & parser_info, -size_px ) \
: parser_scale_for_mapping_em_to_pixels( & parser_info, size_px )
size = size_px
size_scale = parser_scale( & parser_info, size )
if glyph_curve_quality == 0 {
curve_quality = f32(ctx.default_curve_quality)
code/sectr/app/screen.odin
+60 -12
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@@ -18,6 +18,7 @@ UI_ScreenState :: struct
using widget : UI_Widget,
}
},
settings_menu : struct
{
container : UI_Widget,
@@ -29,11 +30,12 @@ UI_ScreenState :: struct
zoom_digital_sensitivity_input : UI_TextInputBox,
zoom_scroll_delta_scale_input : UI_TextInputBox,
font_size_canvas_scalar_input : UI_TextInputBox,
cfg_drop_down : UI_DropDown,
zoom_mode_drop_down : UI_DropDown,
pos, size, min_size : Vec2,
is_open : b32,
is_maximized : b32,
font_size_screen_scalar_input : UI_TextInputBox,
cfg_drop_down : UI_DropDown,
zoom_mode_drop_down : UI_DropDown,
pos, size, min_size : Vec2,
is_open : b32,
is_maximized : b32,
},
}
@@ -166,23 +168,39 @@ ui_screen_settings_menu :: proc( captures : rawptr = nil ) -> ( should_raise : b
Construct_Container:
{
scope(theme_window_panel)
container = ui_widget("Settings Menu", {}); {
container = ui_widget("Settings Menu", {});
if ! settings_menu.is_maximized {
using container
layout.flags = { .Fixed_Width, .Fixed_Height, .Fixed_Position_X, .Fixed_Position_Y, .Origin_At_Anchor_Center }
layout.flags = {
// .Size_To_Content,
.Fixed_Width, .Fixed_Height,
.Fixed_Position_X, .Fixed_Position_Y,
.Origin_At_Anchor_Center
}
layout.pos = pos
layout.size = range2( size, {})
}
if settings_menu.is_maximized {
else {
using container
layout.flags = {.Origin_At_Anchor_Center }
layout.pos = {}
}
old_vbox := ui_box_from_key(prev_cache, ui_key_from_string("Settings Menu: VBox"))
if old_vbox != nil {
vbox_size := size_range2(old_vbox.computed.bounds)
larger_than_size := vbox_size.x > size.x || vbox_size.y > size.y
if ! settings_menu.is_maximized && larger_than_size
{
size = vbox_size
container.layout.size = range2(size, {})
}
}
should_raise |= ui_resizable_handles( & container, & pos, & size)
}
ui_parent(container)
ui_parent_push(container)
vbox := ui_vbox_begin( .Top_To_Bottom, "Settings Menu: VBox", {.Mouse_Clickable}, compute_layout = true)
vbox := ui_vbox_begin( .Top_To_Bottom, "Settings Menu: VBox", {.Mouse_Clickable}, compute_layout = true )
{
should_raise |= b32(vbox.active)
ui_parent(vbox)
@@ -261,7 +279,6 @@ ui_screen_settings_menu :: proc( captures : rawptr = nil ) -> ( should_raise : b
}
}
Engine_Refresh_Hz:
{
scope(theme_table_row(is_even = false))
@@ -559,7 +576,7 @@ ui_screen_settings_menu :: proc( captures : rawptr = nil ) -> ( should_raise : b
Cam_Zoom_Scroll_Delta_Scale:
{
ui_settings_entry_inputbox( & zoom_scroll_delta_scale_input, false, "settings_menu.cam_zoom_scroll_delta_scale", str_intern("Camera: Zoom Scroll Delta Scale"),
ui_settings_entry_inputbox( & zoom_scroll_delta_scale_input, true, "settings_menu.cam_zoom_scroll_delta_scale", str_intern("Camera: Zoom Scroll Delta Scale"),
UI_TextInput_Policy {
digits_only = true,
disallow_leading_zeros = false,
@@ -586,6 +603,35 @@ ui_screen_settings_menu :: proc( captures : rawptr = nil ) -> ( should_raise : b
}
}
Font_Size_Screen_Scalar:
{
ui_settings_entry_inputbox( & font_size_screen_scalar_input, false, "settings_menu.font_size_screen_scalar", str_intern("Font: Size Screen Scalar"),
UI_TextInput_Policy {
digits_only = true,
disallow_leading_zeros = false,
disallow_decimal = false,
digit_min = 0.01,
digit_max = 9999,
max_length = 5,
}
)
using font_size_screen_scalar_input
if was_active
{
value, success := parse_f32(to_string(array_to_slice(input_str)))
if success {
value = clamp(value, 0.001, 9999.0)
config.font_size_screen_scalar = value
}
}
else
{
clear( input_str )
append( & input_str, to_runes(str_fmt("%v", config.font_size_screen_scalar)))
}
}
Font_Size_Canvas_Scalar:
{
ui_settings_entry_inputbox( & font_size_canvas_scalar_input, false, "settings_menu.font_size_canvas_scalar", str_intern("Font: Size Canvas Scalar"),
@@ -617,5 +663,7 @@ ui_screen_settings_menu :: proc( captures : rawptr = nil ) -> ( should_raise : b
}
}
ui_vbox_end(vbox, compute_layout = false )
ui_parent_pop() // container
return
}
code/sectr/app/state.odin
+6 -1
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@@ -161,6 +161,7 @@ AppConfig :: struct {
color_theme : AppColorTheme,
font_size_screen_scalar : f32,
font_size_canvas_scalar : f32,
}
@@ -202,7 +203,7 @@ State :: struct {
default_slab_policy : SlabPolicy,
persistent_slab : Slab,
frame_slab : Slab,
transient_slab : Slab, // TODO(Ed): This needs to be recreated per transient wipe
transient_slab : Slab,
transinet_clear_lock : b32, // Pravents auto-free of transient at designated intervals
transient_clear_time : f32, // Time in seconds for the usual period to clear transient
transient_clear_elapsed : f32, // Time since last clear
@@ -249,8 +250,12 @@ State :: struct {
font_arial_unicode_ms : FontID,
font_firacode : FontID,
font_fira_cousine : FontID,
font_noto_sans : FontID,
font_open_sans : FontID,
font_neodgm_code : FontID,
font_rec_mono_linear : FontID,
font_roboto_regular : FontID,
font_squidgy_slimes : FontID,
font_rec_mono_semicasual_reg : FontID,
default_font : FontID,
code/sectr/engine/client_api.odin
+21 -8
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@@ -88,9 +88,8 @@ startup :: proc( prof : ^SpallProfiler, persistent_mem, frame_mem, transient_mem
push( policy_ptr, SlabSizeClass { 16 * Megabyte, 16 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 32 * Megabyte, 32 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 64 * Megabyte, 64 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 128 * Megabyte, 128 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 256 * Megabyte, 256 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 512 * Megabyte, 512 * Megabyte, alignment })
push( policy_ptr, SlabSizeClass { 128 * Megabyte, 128 * Megabyte, alignment })
// Anything above 128 meg needs to have its own setup looked into.
alloc_error : AllocatorError
persistent_slab, alloc_error = slab_init( policy_ptr, allocator = persistent_allocator(), dbg_name = Persistent_Slab_DBG_Name, enable_mem_tracking = false )
@@ -153,6 +152,7 @@ startup :: proc( prof : ^SpallProfiler, persistent_mem, frame_mem, transient_mem
color_theme = App_Thm_Dusk
font_size_screen_scalar = 1.0
font_size_canvas_scalar = 1.0
}
@@ -271,8 +271,11 @@ startup :: proc( prof : ^SpallProfiler, persistent_mem, frame_mem, transient_mem
// path_squidgy_slimes := strings.concatenate( { Path_Assets, "Squidgy Slimes.ttf" } )
// font_squidgy_slimes = font_load( path_squidgy_slimes, 32.0, "Squidgy_Slime" )
path_firacode := strings.concatenate( { Path_Assets, "FiraCode-Regular.ttf" } )
font_firacode = font_load( path_firacode, 16.0, "FiraCode" )
// path_firacode := strings.concatenate( { Path_Assets, "FiraCode-Regular.ttf" } )
// font_firacode = font_load( path_firacode, 16.0, "FiraCode" )
path_fira_cousine := strings.concatenate( { Path_Assets, "FiraCousine-Regular.ttf" } )
font_fira_cousine = font_load( path_fira_cousine, 16.0, "Fira Cousine" )
// path_open_sans := strings.concatenate( { Path_Assets, "OpenSans-Regular.ttf" } )
// font_open_sans = font_load( path_open_sans, 16.0, "OpenSans" )
@@ -280,10 +283,22 @@ startup :: proc( prof : ^SpallProfiler, persistent_mem, frame_mem, transient_mem
// path_noto_sans := strings.concatenate( { Path_Assets, "NotoSans-Regular.ttf" } )
// font_noto_sans = font_load( path_noto_sans, 16.0, "NotoSans" )
// path_neodgm_code := strings.concatenate( { Path_Assets, "neodgm_code.ttf"} )
// font_neodgm_code = font_load( path_neodgm_code, 32.0, "NeoDunggeunmo Code" )
// path_rec_mono_linear := strings.concatenate( { Path_Assets, "RecMonoLinear-Regular-1.084.ttf" })
// font_rec_mono_linear = font_load( path_rec_mono_linear, 16.0, "RecMonoLinear Regular" )
// path_roboto_regular := strings.concatenate( { Path_Assets, "Roboto-Regular.ttf"} )
// font_roboto_regular = font_load( path_roboto_regular, 32.0, "Roboto Regular" )
// path_arial_unicode_ms := strings.concatenate( { Path_Assets, "Arial Unicode MS.ttf" } )
// font_arial_unicode_ms = font_load( path_arial_unicode_ms, 16.0, "Arial_Unicode_MS" )
default_font = font_firacode
// path_arial_unicode_ms := strings.concatenate( { Path_Assets, "Arial Unicode MS.ttf" } )
// font_arial_unicode_ms = font_load( path_arial_unicode_ms, 16.0, "Arial_Unicode_MS" )
default_font = font_fira_cousine
log( "Default font loaded" )
}
@@ -545,8 +560,6 @@ tick_frametime :: #force_inline proc( client_tick : ^time.Tick, host_delta_time_
// profile("Client tick timing processing")
// config.engine_refresh_hz = uint(monitor_refresh_hz)
// config.engine_refresh_hz = 10
frametime_target_ms = 1.0 / f64(config.engine_refresh_hz) * S_To_MS
sub_ms_granularity_required := frametime_target_ms <= Frametime_High_Perf_Threshold_MS
code/sectr/engine/render.odin
+6 -4
View File
@@ -57,8 +57,8 @@ render_mode_2d_workspace :: proc( screen_extent : Vec2, cam : Camera, input : In
screen_size := screen_extent * 2
// TODO(Ed): Eventually will be the viewport extents
// ve.configure_snap( ve_ctx, u32(screen_size.x), u32(screen_size.y) )
ve.configure_snap( ve_ctx, 0, 0 )
ve.configure_snap( ve_ctx, u32(screen_size.x), u32(screen_size.y) )
// ve.configure_snap( ve_ctx, 0, 0 )
Render_Debug:
{
@@ -801,11 +801,13 @@ draw_text_string_pos_norm :: proc( content : string, id : FontID, size : f32, po
width := app_window.extent.x * 2
height := app_window.extent.y * 2
ve_id, resolved_size := font_provider_resolve_draw_id( id, size )
// TODO(Ed): Review doing double scaling on the text...
ve_id, resolved_size := font_provider_resolve_draw_id( id, size * config.font_size_screen_scalar )
color_norm := normalize_rgba8(color)
ve.set_colour( & font_provider_ctx.ve_ctx, color_norm )
ve.draw_text( & font_provider_ctx.ve_ctx, ve_id, content, pos, Vec2{1 / width, 1 / height} * scale )
ve.draw_text( & font_provider_ctx.ve_ctx, ve_id, content, pos, Vec2{1 / width, 1 / height} * scale * (1/config.font_size_screen_scalar) )
return
}
code/sectr/ui/widgets.odin
+2 -2
View File
@@ -778,8 +778,8 @@ ui_vbox_end_pop_parent :: proc( vbox : UI_VBox ) {
}
@(deferred_out = ui_vbox_end_pop_parent)
ui_vbox :: #force_inline proc( direction : UI_LayoutDirectionY, label : string, flags : UI_BoxFlags = {} ) -> (vbox : UI_VBox) {
vbox = ui_vbox_begin(direction, label, flags)
ui_vbox :: #force_inline proc( direction : UI_LayoutDirectionY, label : string, flags : UI_BoxFlags = {}, compute_layout := false ) -> (vbox : UI_VBox) {
vbox = ui_vbox_begin(direction, label, flags, compute_layout )
ui_parent_push(vbox.widget)
return
}
scripts/build.ps1
+2 -2
View File
@@ -278,9 +278,9 @@ push-location $path_root
$build_args += $flag_use_separate_modules
$build_args += $flag_thread_count + $CoreCount_Physical
# $build_args += $flag_optimize_none
# $build_args += $flag_optimize_minimal
$build_args += $flag_optimize_minimal
# $build_args += $flag_optimize_speed
$build_args += $falg_optimize_aggressive
# $build_args += $falg_optimize_aggressive
$build_args += $flag_debug
$build_args += $flag_pdb_name + $pdb
$build_args += $flag_subsystem + 'windows'