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#ifndef ui_hpp
#define ui_hpp
#include "app.hpp"
#include "maths.hpp"
#include "video.hpp"
#include <new>
struct Arena;
struct UI {
struct Vertex {
float x, y, u, v, r, g, b, a;
};
struct Colour {
uint8_t r, g, b, a;
Colour(unsigned rgb, uint8_t a = 0xff);
float r_f() { return (float)r / 255.0f; };
float g_f() { return (float)g / 255.0f; };
float b_f() { return (float)b / 255.0f; };
float a_f() { return (float)a / 255.0f; };
};
struct Rect {
int x, y, w, h;
Rect() = default;
Rect(int x, int y, int w, int h);
void clip(const Rect& other);
void shrink(int a);
bool contains(int px, int py);
};
struct Vertex_Buffer {
Rect clip;
bool dirty;
Staged_Buffer buf;
Buffer_Id indices;
int start, usage;
void init(Device* dev);
void init_indices(Device* dev);
void destroy(UI* ui);
void update_buffer(Context& ctx);
void reset(const Rect& clip);
void set_clip(const Rect& clip);
void add_quad(
UI* ui,
int x,
int y,
int w,
int h,
float u0,
float v0,
float u1,
float v1,
Colour col
);
void add_rect(
UI* ui,
int x,
int y,
int w,
int h,
Colour col
);
void add_char(UI* ui, int x, int y, char ch, Colour col);
void add_text(
UI* ui,
int x,
int y,
const char* txt,
Colour col
);
void draw(
UI* ui,
Context& ctx,
Pipeline& pip,
Render_Pass& rp
);
Vertex_Buffer* next;
};
struct Element;
Heap* heap;
Device* device;
const App* app;
Texture_Id atlas;
Shader_Id shader;
Vertex_Format_Id vertex_format;
Sampler_Id sampler;
Staged_Buffer cbuffer;
Vertex_Buffer mesh;
Pipeline* pipeline;
Render_Pass* render_pass;
Element* root, * hot, * hovered;
Rect area;
bool layout_dirty;
struct UI_CBuffer {
m4f projection;
};
struct {
int vert_binding;
int atlas_binding;
int config_binding;
} shader_info;
static int text_width(const char* t);
static int text_height(const char* t);
static UI* create(
Device* dev,
const App* app,
Arena* a,
Shader_Id sh
);
void init(
Device* dev,
const App* app,
Heap* h,
Texture_Id atlas,
Shader_Id sh
);
void destroy();
void layout(int w, int h);
void update(Arena* s);
void render(Arena* s, Texture_Id target);
void draw_container(const Rect& r, Colour c);
void draw_containeri(const Rect& r, Colour c);
Element* alloc_element(size_t size);
template <typename T, typename... Args>
T* create_element(Element* parent, Args... args) {
T* e = (T*)alloc_element(sizeof(T));
new (e) T(this, parent, args...);
return e;
}
struct Message {
enum class Type {
click,
destroy,
activate,
deactivate
} type;
};
typedef int (*Message_Handler)(Element* e, const Message& m);
struct Element {
struct Flags {
enum {
disabled = 1 << 0
};
};
UI* ui;
Element* parent;
Element* children, * next;
Message_Handler handler;
Rect bound, clip;
int flags;
Element(UI* ui, Element* parent);
virtual ~Element();
void destroy();
virtual Rect layout(const Rect& avail);
void update();
virtual void on_update();
virtual void on_render();
virtual void on_add_child(Element* nch);
virtual void on_message(const Message& msg);
void add_child(Element* ch);
void remove_child(Element* ch);
void message(const Message& msg);
void render();
bool enabled();
void disable();
void enable();
};
struct Container : Element {
int padding;
Container(UI* ui, Element* parent);
Rect layout(const Rect& avail) override;
void on_render() override;
};
struct Toolbar : Element {
int padding;
Toolbar(UI* ui, Element* parent);
Rect layout(const Rect& avail) override;
void on_render() override;
};
struct Label : Element {
char* text;
Label(UI* ui, Element* parent, const char* label);
~Label();
Rect layout(const Rect& avail) override;
void on_render() override;
void set_text(const char* s);
};
struct Button : Label {
Button(UI* ui, Element* parent, const char* label);
Rect layout(const Rect& avail) override;
void on_render() override;
};
struct Modal : Element {
Container* contents;
Toolbar* title_bar;
Label* title;
Button* close;
int drag_offset[2];
int pos[2];
bool dragging;
Modal(UI* ui, Element* parent, const char* title);
Rect layout(const Rect& avail) override;
void on_render() override;
void on_update() override;
void bring_to_front();
};
struct Tree : Element {
Element* collapsed; /* <- children are moved here when it's collapsed so they stop layout'ing and rendering! */
Button* expandbtn;
Label* text;
Tree(UI* ui, Element* parent, const char* text);
Rect layout(const Rect& avail) override;
void on_render() override;
void on_update() override;
void on_add_child(Element* child) override;
void expand();
void collapse();
bool is_leaf() const;
};
};
#endif
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