started on ui library

src/ui/ui.c

@@ -0,0 +1,82 @@
+#include "ui.h"
+#include "input.h"
+#include "layers.h"
+#include "SDL2/SDL_render.h"
+#include "SDL2/SDL_ttf.h"
+
+#define UI_NUM_WINDOWS 16
+
+style_t ui_style = {};
+
+typedef struct window_t {
+	SDL_FRect rect;
+	int dragged;
+	int confirmed;
+} window_t;
+
+struct {
+	depth_t depth;
+	uintptr_t selected;
+	int hold_selection;
+
+	window_t* window;
+	float width, height;
+
+	struct {
+		char input_buffer[999];
+		char* cursor;
+	} input;
+} _state;
+
+window_t _windows[UI_NUM_WINDOWS];
+window_t* _windows_endptr = _windows;
+
+int ui_button(const char* label) {
+	SDL_FRect r = _state.window->rect;
+
+	int w, h;
+	TTF_SizeText(ui_style.text.font, label, &w, &h);
+	SDL_FRect btn = {
+		_state.window->rect.x, _state.window->rect.y + _state.window->rect.h,
+		w, h
+	};
+
+	float mx, my;
+	mouse_screen_position(&mx, &my);
+	draw_text(label, btn, ui_style.text, _state.depth-1);
+	mx -= btn.x; my -= btn.y;
+	if(mx >= 0 && mx < btn.w && my >= 0 && my < btn.h) {
+		return 1;
+	} else {
+		return 0;
+	}
+}
+
+void ui_init() {
+}
+
+void ui_begin_frame() {
+	if(!_state.hold_selection) {
+		_state.selected = 0x0;
+	}
+	_state.window = NULL;
+	_state.depth = RLAYER_UI;
+}
+
+void ui_window_begin(const char* name, float* x, float* y) {
+	for(window_t* itr = _windows; itr != _windows_endptr; ++itr) {
+		if(itr->rect.x == *x && itr->rect.y == *y) {
+			itr->confirmed = 1;
+			_state.window = itr;
+		}
+	}
+	if(_state.window == NULL) {
+		*_windows_endptr =  (window_t){
+			.rect = (SDL_FRect){*x, *y, 0.0, 0.0},
+			.dragged = 0, .confirmed = 0
+		};
+	}
+}
+
+void ui_window_end() {
+}

src/ui/ui.h

@@ -0,0 +1,35 @@
+#ifndef _ui_h
+#define _ui_h
+
+#include "render.h"
+#include "SDL2/SDL_ttf.h"
+
+typedef struct style_t {
+	struct {
+		nineslice_t button;
+		nineslice_t active;
+	} button;
+	struct {
+		nineslice_t input;
+		nineslice_t active;
+	} input;
+	nineslice_t window_style;
+
+	float spacing;
+	text_style_t text;
+} style_t;
+
+extern style_t ui_style;
+
+extern void ui_init();
+
+extern void ui_begin_frame();
+extern void ui_end_frame();
+
+extern void ui_window_begin(const char* name, float* x, float* y);
+extern void ui_window_end();
+
+extern int ui_button(const char* label);
+extern int ui_input(char* buffer, int max_size);
+
+#endif /* _ui_h */