start ui

1 files changed, 277 insertions, 0 deletions

diff --git a/teensy/teensy_ui.c b/teensy/teensy_ui.c
new file mode 100644
index 0000000..af3e78f
--- /dev/null
+++ b/teensy/teensy_ui.c
@@ -0,0 +1,277 @@
+#include "teensy_ui.h"
+
+#include <assert.h>
+ 
+#include "teensy_list.h"
+
+#define TITLE_BAR_HEIGHT (8)
+#define TEXT_HEIGHT (8)
+
+enum {
+    CMD_RECT,
+    CMD_TEXT,
+    CMD_TARGET,
+    CMD_IMAGE,
+};
+typedef uint8_t Cmd_Kind;
+
+typedef struct {
+    const char *text;
+    ty_Recti rect;
+    ty_Color color;
+    const ty_Image *img;
+    Cmd_Kind kind;
+} Cmd;
+
+typedef struct {
+    const char *title;
+    ty_Recti rect;
+    ty_Image content;
+    uint32_t flags;
+
+    ty_Vec2i next_pos;
+} Window;
+
+typedef struct {
+    Window *active;
+    Window root;
+    Window windows[255];
+    int window_count;
+    tyui_Style style;
+    const ty_Font *font;
+    Cmd *cmds;
+
+    ty_Vec2i prev_mouse_pos;
+} Ctx;
+
+static
+tyui_Style default_style = {
+    .fg_normal = ty_color(200, 200, 200),
+    .bg_normal = ty_color(64, 64, 64),
+    .fg_hover  = ty_color(255, 255, 255),
+    .bg_hover  = ty_color(100, 100, 100),
+    .win_bg    = ty_color(48, 48, 48),
+    .win_title = ty_color(64, 128, 128),
+};
+
+static
+Ctx uictx;
+
+static
+void rect_cmd(ty_Recti rect, ty_Color color)
+{
+    Cmd cmd = {};
+    cmd.kind = CMD_RECT;
+    cmd.rect = rect;
+    cmd.color = color;
+
+    ty_list_append(uictx.cmds, cmd);
+}
+
+static
+void text_cmd(const char *text, ty_Vec2i pos)
+{
+    Cmd cmd = {};
+    cmd.kind = CMD_TEXT;
+    cmd.text = text;
+    cmd.rect.x = pos.x;
+    cmd.rect.y = pos.y;
+
+    ty_list_append(uictx.cmds, cmd);
+}
+
+static
+void image_cmd(const ty_Image *img, ty_Vec2i pos)
+{
+    Cmd cmd = {};
+    cmd.kind = CMD_IMAGE;
+    cmd.img = img;
+    cmd.rect.x = pos.x;
+    cmd.rect.y = pos.y;
+    ty_list_append(uictx.cmds, cmd);
+}
+
+static
+void target_cmd(const ty_Image *target)
+{
+    Cmd cmd = {};
+    cmd.kind = CMD_TARGET;
+    cmd.img = target;
+    ty_list_append(uictx.cmds, cmd);
+}
+
+static
+ty_Vec2i next_pos(int height)
+{
+    ty_Vec2i next = uictx.active->next_pos;
+    uictx.active->next_pos.y += height;
+    return next;
+}
+
+static
+ty_Vec2i mouse_delta(void)
+{
+    ty_Vec2i cur = ty_mouse_pos();
+    return ty_vec2i(
+        cur.x - uictx.prev_mouse_pos.x,
+        cur.y - uictx.prev_mouse_pos.y
+    );
+}
+
+static
+Window create_window(const char *title, ty_Recti rect, uint32_t flags)
+{
+    Window win = {};
+    win.title = title;
+    win.rect = rect;
+    win.flags = flags;
+    win.content = ty_create_image(rect.w, rect.h, NULL);
+    return win;
+}
+
+void tyui_init(const ty_Font *font)
+{
+    assert(font);
+
+    uictx.cmds = ty_list_create();
+    ty_list_reserve(uictx.cmds, 256);
+
+    uint32_t root_flags = 0;
+    root_flags |= TYUI_WIN_NORESIZE;
+    root_flags |= TYUI_WIN_NOCLOSE;
+    root_flags |= TYUI_WIN_NOMOVE;
+    root_flags |= TYUI_WIN_INVISIBLE;
+
+    uictx.root = create_window(
+        "__ROOT__",
+        ty_recti(0, 0, 256, 256),
+        root_flags
+    );
+
+    uictx.style = default_style;
+    uictx.font = font;
+
+    uictx.active = &uictx.root;
+}
+
+void tyui_deinit(void)
+{
+    ty_list_free(uictx.cmds);
+
+    ty_free_image(uictx.root.content);
+    for (int i = 0; i < uictx.window_count; i++) {
+        ty_free_image(uictx.windows[i].content);
+    }
+}
+
+void tyui_draw(void)
+{
+    for (size_t i = 0; i < ty_list_len(uictx.cmds); i++) {
+        Cmd cmd = uictx.cmds[i];
+        switch (cmd.kind) {
+        case CMD_RECT:
+            ty_draw_rect(cmd.rect, cmd.color);
+            break;
+        case CMD_TEXT:
+            ty_draw_text(uictx.font, ty_recti_start(cmd.rect), cmd.text);
+            break;
+        case CMD_IMAGE:
+            ty_draw_image(*cmd.img, ty_recti_start(cmd.rect));
+            break;
+        case CMD_TARGET:
+            ty_draw_set_target(cmd.img);
+            if (cmd.img != NULL) ty_draw_clear(TY_COLOR_MAGENTA);
+            break;
+        }
+    }
+    ty_list_clear(uictx.cmds);
+
+    uictx.prev_mouse_pos = ty_mouse_pos();
+}
+
+bool tyui_begin_window_ex(
+    const char *title,
+    ty_Recti rect,
+    tyui_Id *id,
+    uint32_t flags,
+    bool *closed_ptr
+) {
+    assert(id);
+
+    bool closed = false;
+
+    if (closed_ptr)
+        closed = *closed_ptr;
+
+    if (uictx.active != &uictx.root) {
+        ty_log_err("cannot create window within another window");
+        return false;
+    }
+
+    if (closed)
+        return !closed;
+
+    if (*id == 0) {
+        *id = ++uictx.window_count;
+        uictx.windows[*id - 1] = create_window(title, rect, flags);
+    }
+
+    Window *win = &uictx.windows[*id - 1];
+    uictx.active = win;
+
+    win->next_pos = ty_vec2i(0, 0);
+
+    if (win->flags & TYUI_WIN_INVISIBLE)
+        goto done;
+
+    ty_Recti title_rect = win->rect;
+    title_rect.h = TEXT_HEIGHT;
+
+    ty_Vec2i mouse_pos = ty_mouse_pos();
+    ty_Vec2i md = mouse_delta();
+    mouse_pos.x -= md.x;
+    mouse_pos.y -= md.y;
+
+    if (ty_button_down(TY_BTN_DB_LMB) && 
+        ty_pointi_in_recti(mouse_pos, title_rect)
+    ) {
+        ty_Vec2i md = mouse_delta();
+        win->rect.x += md.x;
+        win->rect.y += md.y;
+
+        title_rect = win->rect;
+        title_rect.h = TEXT_HEIGHT;
+    }
+
+    rect_cmd(title_rect, uictx.style.win_title);
+    text_cmd(win->title, ty_recti_start(title_rect));
+
+    ty_Recti body_rect = win->rect;
+    body_rect.y += TEXT_HEIGHT;
+    rect_cmd(body_rect, uictx.style.win_bg);
+
+    target_cmd(&win->content);
+
+done:
+    return !closed;
+}
+
+void tyui_end_window(void)
+{
+    if (uictx.active == &uictx.root) {
+        ty_log_err("ending window with no window open");
+        return;
+    }
+
+    target_cmd(NULL);
+    ty_Vec2i content_pos = ty_recti_start(uictx.active->rect);
+    content_pos.y += TITLE_BAR_HEIGHT;
+    image_cmd(&uictx.active->content, content_pos);
+
+    uictx.active = &uictx.root;
+}
+
+void tyui_text(const char *text)
+{
+    text_cmd(text, next_pos(TEXT_HEIGHT));
+}