internal state reference

program.odin

@@ -31,17 +31,17 @@ update :: proc() {
 	rl.ClearBackground(rl.BLACK)
 
 	ui_start(&ui_state)
-		ui_container_begin(&ui_state, {label = ""})
+		ui_container_begin({label = ""})
 			ui_button_size := v2{192.0, 32.0}
-			ui_button(&ui_state, ui_button_size, {label = "Hi"})
+			ui_button(ui_button_size, {label = "Hi"})
-			ui_same_line(&ui_state)
+			ui_same_line()
-			ui_button(&ui_state, ui_button_size, {label = "Hi"})
+			ui_button(ui_button_size, {label = "Hi"})
-			ui_same_line(&ui_state)
+			ui_same_line()
-			ui_button(&ui_state, ui_button_size, {label = "Hi"})
+			ui_button(ui_button_size, {label = "Hi"})
-			ui_input(&ui_state, ui_button_size, {label = "", value = &value, min = 0, max = 10})
+			ui_input(ui_button_size, {label = "", value = &value, min = 0, max = 10})
-		ui_container_end(&ui_state)
+		ui_container_end()
-		ui_button(&ui_state, ui_button_size, {label = "notheunoehunh"})
+		ui_button(ui_button_size, {label = "notheunoehunh"})
-	ui_elements := ui_end(ui_state)
+	ui_elements := ui_end()
 
 	for element in ui_elements {
 		switch element.type {

ui.odin

@@ -4,6 +4,8 @@ import "core:math/linalg"
 import "core:fmt"
 import "core:mem"
 
+@(private="file") state_current: ^UiState
+
 UiElementType :: enum {
 	Input,
 	Button,
@@ -43,26 +45,36 @@ UiStyle :: struct {
 	margin, padding: f32,
 }
 
-ui_id_invalid :: proc() -> UiElementId {
+ui_init :: proc(state: ^UiState, style: UiStyle, origin: v2, allocator: mem.Allocator) {
-	return {group_index = max(u16), element_index = max(u16)}
+	state^ = {
+		element_focus_id = ui_id_invalid(),
+		origin = origin,
+		position = origin,
+		style = style,
+		elements = make(type_of(state.elements), 0, 512, allocator)
+	}
 }
 
 ui_start :: proc(state: ^UiState) {
+	state_current = state
 	clear(&state.elements)
 	state.id_current = {group_index = 0, element_index = 0}
 	state.position_left = state.origin
 	state.position = state.position_left
 }
 
-ui_end :: proc(state: UiState) -> []UiElement {
+ui_end :: proc() -> []UiElement {
-	return state.elements[:]
+	elements := state_current.elements[:]
+	state_current = nil
+	return elements
 }
 
 UiElementData_Button :: struct {
 	label: cstring,
 }
 
-ui_button :: proc(state: ^UiState, size: v2, data: UiElementData_Button) {
+ui_button :: proc(size: v2, data: UiElementData_Button) {
+	state := state_current
 	area := _ui_advance_element(state, size)
 	state.id_current.element_index += 1
 	append(&state.elements, UiElement{id = state.id_current, area = area, type = .Button, data = data})
@@ -72,16 +84,19 @@ UiElementData_Container :: struct {
 	label: cstring,
 }
 
-ui_container_begin :: proc(state: ^UiState, data: UiElementData_Container) {
+ui_container_begin :: proc(data: UiElementData_Container) {
+	state := state_current
 	assert(state.container == nil)
 	state.id_current = {group_index = state.id_current.group_index + 1, element_index = 0}
 	element := UiElement{id = state.id_current, area = _ui_advance_container(state), type = .Container, data = data}
 	append(&state.elements, element)
 	state.position_left += state.style.margin + state.style.padding
 	state.container = &state.elements[len(state.elements) - 1]
+	state.group_element_count = 0
 }
 
-ui_container_end :: proc(state: ^UiState) {
+ui_container_end :: proc() {
+	state := state_current
 	assert(state.container != nil)
 	state.position_left.x = state.origin.x
 	state.position_left.y = state.container.area.y + state.container.area.height
@@ -96,24 +111,15 @@ UiElementData_Input :: struct {
 	min, max: i32,
 }
 
-ui_input :: proc(state: ^UiState, size: v2, data: UiElementData_Input) {
+ui_input :: proc(size: v2, data: UiElementData_Input) {
+	state := state_current
 	area := _ui_advance_element(state, size)
 	state.id_current.element_index += 1
 	append(&state.elements, UiElement{id = state.id_current, area = area, type = .Input, data = data})
 }
 
-ui_same_line :: proc(state: ^UiState) {
+ui_same_line :: proc() {
-	state.same_line = true
+	state_current.same_line = true
-}
-
-ui_init :: proc(state: ^UiState, style: UiStyle, origin: v2, allocator: mem.Allocator) {
-	state^ = {
-		element_focus_id = ui_id_invalid(),
-		origin = origin,
-		position = origin,
-		style = style,
-		elements = make(type_of(state.elements), 0, 512, allocator)
-	}
 }
 
 ui_element_is_editing :: proc(state: UiState, id: UiElementId) -> bool {
@@ -128,6 +134,10 @@ ui_element_focus_reset :: proc(state: ^UiState) {
 	state.element_focus_id = ui_id_invalid()
 }
 
+ui_id_invalid :: proc() -> UiElementId {
+	return {group_index = max(u16), element_index = max(u16)}
+}
+
 _ui_advance_element :: proc(state: ^UiState, size: v2) -> rect2 {
 	if state.group_element_count > 0 {
 		if state.same_line {