178 lines
3.7 KiB
C
178 lines
3.7 KiB
C
/* date = March 28th 2022 10:52 pm */
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#ifndef LUMENARIUM_UI_H
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#define LUMENARIUM_UI_H
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/////////////////////////////////////////////////////////////
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// Interface
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struct UI_Vertex
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{
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v4 pos;
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v2 uv;
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v4 color;
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};
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#define UI_WIDGET_ID_VALID_BIT 1 << 31
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union UI_Widget_Id
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{
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// equality of widget id's only relies on the value field
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// which is a hash of the widget's string
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u32 value;
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// this struct tracks the index of the widget only to be able
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// to override next hot in cases where an earlier element became
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// next hot that is in the same location as the current one
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u32 index;
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};
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typedef u32 UI_Widget_Style_Flags;
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enum
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{
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UIWidgetStyle_None = 0,
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UIWidgetStyle_Bg = 1,
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UIWidgetStyle_Text = 2,
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UIWidgetStyle_Outline = 4,
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UIWidgetStyle_MouseClick = 8,
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UIWidgetStyle_MouseDrag = 16,
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};
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// akin to a css class, could be used to style multiple
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// elements
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struct UI_Widget_Style
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{
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UI_Widget_Style_Flags flags;
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v4 color_bg;
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v4 color_fg;
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u32 sprite;
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};
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// combination of style info and per-instance data
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struct UI_Widget_Desc
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{
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UI_Widget_Style style;
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String string;
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v2 p_min;
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v2 p_max;
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};
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struct UI_Widget
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{
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UI_Widget_Id id;
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UI_Widget_Desc desc;
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UI_Widget* parent;
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UI_Widget* next;
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UI_Widget* child_first;
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UI_Widget* child_last;
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};
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typedef u32 UI_Widget_Result_Flags;
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enum
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{
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UIWidgetResult_None = 0,
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UIWidgetResult_MouseLeft_IsDown = 1,
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UIWidgetResult_MouseLeft_WentUp = 2,
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};
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struct UI_Widget_Result
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{
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UI_Widget_Result_Flags flags;
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};
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enum UI_Widget_Kind
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{
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UIWidget_Text,
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// Buttons
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UIWidget_Button,
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UIWidget_Toggle,
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UIWidget_Menu,
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UIWidget_Dropdown,
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// Sliders
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UIWidget_HSlider,
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UIWidget_VSlider,
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UIWidget_HScroll,
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UIWidget_VScroll,
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// Panels
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UIWidget_Window,
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UIWidget_Count,
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};
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struct UI_Style_Sheet
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{
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UI_Widget_Style styles[UIWidget_Count];
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};
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struct UI_Widget_Pool
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{
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UI_Widget* free;
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u32 free_cap;
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u32 free_len;
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UI_Widget* root;
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UI_Widget* active_parent;
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};
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struct UI
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{
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UI_Vertex* verts;
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u32 verts_len;
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u32 verts_cap;
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u32* indices;
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u32 indices_len;
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u32 indices_cap;
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Texture_Atlas atlas;
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r32 font_ascent, font_descent, font_line_gap, font_space_width;
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UI_Widget_Pool widgets;
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UI_Style_Sheet* style_sheet;
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UI_Widget_Id widget_next_hot;
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UI_Widget_Id widget_hot;
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// frames since these values were set
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u16 widget_next_hot_frames;
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u16 widget_hot_frames;
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Input_State* input;
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m44 proj;
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Platform_Shader shader;
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Platform_Texture atlas_texture;
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Platform_Geometry_Buffer per_frame_buffer;
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};
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// Interface
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internal UI ui_create();
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internal void ui_quad_push(UI* ui, v3 pmin, v3 pmax, v2 tmin, v2 tmax, v4 c);
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internal void ui_sprite_register(UI* ui, u8* pixels, u32 w, u32 h, u32 id);
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internal void ui_sprite_push(UI* ui, v3 pmin, v3 pmax, u32 id, v4 color);
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internal void ui_sprite_push(UI* ui, v3 pmin, v3 pmax, u32 id);
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internal v3 ui_sprite_char_push(UI* ui, v2 at, u32 codepoint, v4 color);
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internal void ui_draw(UI* ui);
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// Widgets
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internal UI_Widget_Id ui_widget_id_create(u32 index_in_parent, String string);
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internal bool ui_widget_id_equals(UI_Widget_Id a, UI_Widget_Id b);
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internal bool ui_widget_id_is_valid(UI_Widget_Id h);
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internal UI_Widget* ui_widget_pool_push(UI_Widget_Pool* pool, String string);
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internal void ui_widget_pool_pop(UI_Widget_Pool* pool);
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internal UI_Widget_Result ui_widget_push(UI* ui, UI_Widget_Desc desc);
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internal void ui_widget_pop(UI* ui, UI_Widget* widget);
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internal r32 ui_widgets_to_geometry_recursive(UI* ui, UI_Widget* widget, r32 z_start, r32 z_step);
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#endif //LUMENARIUM_UI_H
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