492 lines
19 KiB
C
492 lines
19 KiB
C
/*
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* Nuklear - v1.17 - public domain
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* no warrenty implied; use at your own risk.
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* authored from 2015-2016 by Micha Mettke
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*/
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/*
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* ==============================================================
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*
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* API
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*
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* ===============================================================
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*/
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#ifndef NK_ALLEGRO5_H_
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#define NK_ALLEGRO5_H_
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#include <string.h>
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#include <allegro5/allegro.h>
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#include <allegro5/allegro_image.h>
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#include <allegro5/allegro_primitives.h>
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#include <allegro5/allegro_font.h>
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#include <allegro5/allegro_ttf.h>
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typedef struct NkAllegro5Font NkAllegro5Font;
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NK_API struct nk_context* nk_allegro5_init(NkAllegro5Font *font, ALLEGRO_DISPLAY *dsp,
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unsigned int width, unsigned int height,
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void (*open_keyboard_func)(void),
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void (*close_keyboard_func)(void));
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NK_API void nk_allegro5_handle_event(ALLEGRO_EVENT *ev);
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NK_API void nk_allegro5_shutdown(void);
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NK_API void nk_allegro5_render(void);
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/* Fonts. We wrap normal allegro fonts in some nuklear book keeping */
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NK_API NkAllegro5Font* nk_allegro5_font_create_from_file(const char *file_name, int font_size, int flags);
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NK_API void nk_allegro5_font_del(NkAllegro5Font *font);
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NK_API void nk_allegro5_font_set_font(NkAllegro5Font *font);
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#endif
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/*
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* ==============================================================
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*
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* IMPLEMENTATION
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*
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* ===============================================================
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*/
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#ifdef NK_ALLEGRO5_IMPLEMENTATION
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#ifndef NK_ALLEGRO5_TEXT_MAX
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#define NK_ALLEGRO5_TEXT_MAX 256
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#endif
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struct NkAllegro5Font {
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struct nk_user_font nk;
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int height;
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ALLEGRO_FONT *font;
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};
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static struct nk_allegro5 {
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ALLEGRO_DISPLAY *dsp;
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unsigned int width;
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unsigned int height;
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int is_touch_down;
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int touch_down_id;
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struct nk_context ctx;
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struct nk_buffer cmds;
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} allegro5;
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/* Flags are identical to al_load_font() flags argument */
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NK_API NkAllegro5Font*
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nk_allegro5_font_create_from_file(const char *file_name, int font_size, int flags)
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{
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if (!al_init_image_addon()) {
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fprintf(stdout, "Unable to initialize required allegro5 image addon\n");
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exit(1);
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}
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if (!al_init_font_addon()) {
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fprintf(stdout, "Unable to initialize required allegro5 font addon\n");
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exit(1);
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}
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if (!al_init_ttf_addon()) {
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fprintf(stdout, "Unable to initialize required allegro5 TTF font addon\n");
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exit(1);
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}
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NkAllegro5Font *font = (NkAllegro5Font*)calloc(1, sizeof(NkAllegro5Font));
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font->font = al_load_font(file_name, font_size, flags);
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if (font->font == NULL) {
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fprintf(stdout, "Unable to load font file: %s\n", file_name);
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return NULL;
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}
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font->height = al_get_font_line_height(font->font);
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return font;
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}
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static float
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nk_allegro5_font_get_text_width(nk_handle handle, float height, const char *text, int len)
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{
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NkAllegro5Font *font = (NkAllegro5Font*)handle.ptr;
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if (!font || !text) {
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return 0;
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}
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/* We must copy into a new buffer with exact length null-terminated
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as nuklear uses variable size buffers and al_get_text_width doesn't
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accept a length, it infers length from null-termination
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(which is unsafe API design by allegro devs!) */
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char strcpy[len+1];
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strncpy((char*)&strcpy, text, len);
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strcpy[len] = '\0';
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return al_get_text_width(font->font, strcpy);
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}
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NK_API void
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nk_allegro5_font_set_font(NkAllegro5Font *allegro5font)
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{
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struct nk_user_font *font = &allegro5font->nk;
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font->userdata = nk_handle_ptr(allegro5font);
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font->height = (float)allegro5font->height;
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font->width = nk_allegro5_font_get_text_width;
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nk_style_set_font(&allegro5.ctx, font);
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}
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NK_API void
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nk_allegro5_font_del(NkAllegro5Font *font)
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{
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if(!font) return;
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al_destroy_font(font->font);
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free(font);
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}
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static ALLEGRO_COLOR
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nk_color_to_allegro_color(struct nk_color color)
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{
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return al_map_rgba((unsigned char)color.r, (unsigned char)color.g,
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(unsigned char)color.b, (unsigned char)color.a);
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}
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NK_API void
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nk_allegro5_render()
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{
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const struct nk_command *cmd;
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al_set_target_backbuffer(allegro5.dsp);
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nk_foreach(cmd, &allegro5.ctx)
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{
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ALLEGRO_COLOR color;
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switch (cmd->type) {
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case NK_COMMAND_NOP: break;
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case NK_COMMAND_SCISSOR: {
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const struct nk_command_scissor *s =(const struct nk_command_scissor*)cmd;
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al_set_clipping_rectangle((int)s->x, (int)s->y, (int)s->w, (int)s->h);
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} break;
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case NK_COMMAND_LINE: {
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const struct nk_command_line *l = (const struct nk_command_line *)cmd;
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color = nk_color_to_allegro_color(l->color);
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al_draw_line((float)l->begin.x, (float)l->begin.y, (float)l->end.x,
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(float)l->end.y, color, (float)l->line_thickness);
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} break;
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case NK_COMMAND_RECT: {
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const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
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color = nk_color_to_allegro_color(r->color);
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al_draw_rounded_rectangle((float)r->x, (float)r->y, (float)(r->x + r->w),
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(float)(r->y + r->h), (float)r->rounding, (float)r->rounding, color,
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(float)r->line_thickness);
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} break;
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case NK_COMMAND_RECT_FILLED: {
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const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
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color = nk_color_to_allegro_color(r->color);
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al_draw_filled_rounded_rectangle((float)r->x, (float)r->y,
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(float)(r->x + r->w), (float)(r->y + r->h), (float)r->rounding,
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(float)r->rounding, color);
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} break;
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case NK_COMMAND_CIRCLE: {
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const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
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color = nk_color_to_allegro_color(c->color);
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float xr, yr;
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xr = (float)c->w/2;
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yr = (float)c->h/2;
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al_draw_ellipse(((float)(c->x)) + xr, ((float)c->y) + yr,
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xr, yr, color, (float)c->line_thickness);
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} break;
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case NK_COMMAND_CIRCLE_FILLED: {
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const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
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color = nk_color_to_allegro_color(c->color);
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float xr, yr;
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xr = (float)c->w/2;
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yr = (float)c->h/2;
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al_draw_filled_ellipse(((float)(c->x)) + xr, ((float)c->y) + yr,
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xr, yr, color);
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} break;
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case NK_COMMAND_TRIANGLE: {
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const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
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color = nk_color_to_allegro_color(t->color);
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al_draw_triangle((float)t->a.x, (float)t->a.y, (float)t->b.x, (float)t->b.y,
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(float)t->c.x, (float)t->c.y, color, (float)t->line_thickness);
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} break;
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case NK_COMMAND_TRIANGLE_FILLED: {
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const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
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color = nk_color_to_allegro_color(t->color);
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al_draw_filled_triangle((float)t->a.x, (float)t->a.y, (float)t->b.x,
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(float)t->b.y, (float)t->c.x, (float)t->c.y, color);
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} break;
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case NK_COMMAND_POLYGON: {
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const struct nk_command_polygon *p = (const struct nk_command_polygon*)cmd;
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color = nk_color_to_allegro_color(p->color);
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int i;
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float vertices[p->point_count * 2];
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for (i = 0; i < p->point_count; i++) {
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vertices[i*2] = p->points[i].x;
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vertices[(i*2) + 1] = p->points[i].y;
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}
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al_draw_polyline((const float*)&vertices, (2 * sizeof(float)),
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(int)p->point_count, ALLEGRO_LINE_JOIN_ROUND, ALLEGRO_LINE_CAP_CLOSED,
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color, (float)p->line_thickness, 0.0);
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} break;
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case NK_COMMAND_POLYGON_FILLED: {
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const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
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color = nk_color_to_allegro_color(p->color);
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int i;
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float vertices[p->point_count * 2];
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for (i = 0; i < p->point_count; i++) {
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vertices[i*2] = p->points[i].x;
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vertices[(i*2) + 1] = p->points[i].y;
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}
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al_draw_filled_polygon((const float*)&vertices, (int)p->point_count, color);
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} break;
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case NK_COMMAND_POLYLINE: {
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const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
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color = nk_color_to_allegro_color(p->color);
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int i;
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float vertices[p->point_count * 2];
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for (i = 0; i < p->point_count; i++) {
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vertices[i*2] = p->points[i].x;
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vertices[(i*2) + 1] = p->points[i].y;
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}
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al_draw_polyline((const float*)&vertices, (2 * sizeof(float)),
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(int)p->point_count, ALLEGRO_LINE_JOIN_ROUND, ALLEGRO_LINE_CAP_ROUND,
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color, (float)p->line_thickness, 0.0);
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} break;
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case NK_COMMAND_TEXT: {
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const struct nk_command_text *t = (const struct nk_command_text*)cmd;
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color = nk_color_to_allegro_color(t->foreground);
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NkAllegro5Font *font = (NkAllegro5Font*)t->font->userdata.ptr;
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al_draw_text(font->font,
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color, (float)t->x, (float)t->y, 0,
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(const char*)t->string);
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} break;
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case NK_COMMAND_CURVE: {
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const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
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color = nk_color_to_allegro_color(q->color);
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float points[8];
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points[0] = (float)q->begin.x;
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points[1] = (float)q->begin.y;
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points[2] = (float)q->ctrl[0].x;
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points[3] = (float)q->ctrl[0].y;
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points[4] = (float)q->ctrl[1].x;
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points[5] = (float)q->ctrl[1].y;
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points[6] = (float)q->end.x;
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points[7] = (float)q->end.y;
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al_draw_spline(points, color, (float)q->line_thickness);
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} break;
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case NK_COMMAND_ARC: {
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const struct nk_command_arc *a = (const struct nk_command_arc *)cmd;
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color = nk_color_to_allegro_color(a->color);
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al_draw_arc((float)a->cx, (float)a->cy, (float)a->r, a->a[0],
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a->a[1], color, (float)a->line_thickness);
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} break;
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case NK_COMMAND_RECT_MULTI_COLOR:
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case NK_COMMAND_IMAGE:
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case NK_COMMAND_ARC_FILLED:
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default: break;
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}
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}
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nk_clear(&allegro5.ctx);
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}
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NK_API void
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nk_allegro5_handle_event(ALLEGRO_EVENT *ev)
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{
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struct nk_context *ctx = &allegro5.ctx;
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switch (ev->type) {
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case ALLEGRO_EVENT_DISPLAY_RESIZE: {
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if (ev->display.source != allegro5.dsp) {
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return;
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}
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allegro5.width = (unsigned int)ev->display.width;
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allegro5.height = (unsigned int)ev->display.height;
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al_acknowledge_resize(ev->display.source);
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} break;
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case ALLEGRO_EVENT_MOUSE_AXES: {
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if (ev->mouse.display != allegro5.dsp) {
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return;
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}
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nk_input_motion(ctx, ev->mouse.x, ev->mouse.y);
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if (ev->mouse.dz != 0) {
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nk_input_scroll(ctx, (float)ev->mouse.dz / al_get_mouse_wheel_precision());
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}
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} break;
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case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
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case ALLEGRO_EVENT_MOUSE_BUTTON_UP: {
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if (ev->mouse.display != allegro5.dsp) {
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return;
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}
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int button = NK_BUTTON_LEFT;
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if (ev->mouse.button == 2) {
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button = NK_BUTTON_RIGHT;
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}
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else if (ev->mouse.button == 3) {
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button = NK_BUTTON_MIDDLE;
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}
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nk_input_button(ctx, button, ev->mouse.x, ev->mouse.y, ev->type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN);
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} break;
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/* This essentially converts touch events to mouse events */
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case ALLEGRO_EVENT_TOUCH_BEGIN:
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case ALLEGRO_EVENT_TOUCH_END: {
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if (ev->touch.display != allegro5.dsp) {
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return;
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}
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/* We only acknowledge one touch at a time. Otherwise, each touch
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would be manipulating multiple nuklear elements, as if there
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were multiple mouse cursors */
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if (allegro5.is_touch_down && allegro5.touch_down_id != ev->touch.id) {
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return;
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}
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if (ev->type == ALLEGRO_EVENT_TOUCH_BEGIN) {
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allegro5.is_touch_down = 1;
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allegro5.touch_down_id = ev->touch.id;
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/* FIXME: This is a hack to properly simulate
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touches as a mouse with nuklear. If you instantly jump
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from one place to another without an nk_input_end(), it
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confuses the nuklear state. nuklear expects smooth mouse
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movements, which is unlike a touch screen */
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nk_input_motion(ctx, (int)ev->touch.x, (int)ev->touch.y);
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nk_input_end(ctx);
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nk_input_begin(ctx);
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}
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else {
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allegro5.is_touch_down = 0;
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allegro5.touch_down_id = -1;
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}
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nk_input_button(ctx, NK_BUTTON_LEFT, (int)ev->touch.x, (int)ev->touch.y, ev->type == ALLEGRO_EVENT_TOUCH_BEGIN);
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} break;
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case ALLEGRO_EVENT_TOUCH_MOVE: {
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if (ev->touch.display != allegro5.dsp) {
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return;
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}
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/* Only acknowledge movements of a single touch, we are
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simulating a mouse cursor */
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if (!allegro5.is_touch_down || allegro5.touch_down_id != ev->touch.id) {
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return;
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}
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nk_input_motion(ctx, (int)ev->touch.x, (int)ev->touch.y);
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} break;
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case ALLEGRO_EVENT_KEY_DOWN:
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case ALLEGRO_EVENT_KEY_UP: {
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if (ev->keyboard.display != allegro5.dsp) {
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return;
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}
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int kc = ev->keyboard.keycode;
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int down = ev->type == ALLEGRO_EVENT_KEY_DOWN;
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if (kc == ALLEGRO_KEY_LSHIFT || kc == ALLEGRO_KEY_RSHIFT) nk_input_key(ctx, NK_KEY_SHIFT, down);
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else if (kc == ALLEGRO_KEY_DELETE) nk_input_key(ctx, NK_KEY_DEL, down);
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else if (kc == ALLEGRO_KEY_ENTER) nk_input_key(ctx, NK_KEY_ENTER, down);
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else if (kc == ALLEGRO_KEY_TAB) nk_input_key(ctx, NK_KEY_TAB, down);
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else if (kc == ALLEGRO_KEY_LEFT) nk_input_key(ctx, NK_KEY_LEFT, down);
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else if (kc == ALLEGRO_KEY_RIGHT) nk_input_key(ctx, NK_KEY_RIGHT, down);
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else if (kc == ALLEGRO_KEY_UP) nk_input_key(ctx, NK_KEY_UP, down);
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else if (kc == ALLEGRO_KEY_DOWN) nk_input_key(ctx, NK_KEY_DOWN, down);
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else if (kc == ALLEGRO_KEY_BACKSPACE) nk_input_key(ctx, NK_KEY_BACKSPACE, down);
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else if (kc == ALLEGRO_KEY_ESCAPE) nk_input_key(ctx, NK_KEY_TEXT_RESET_MODE, down);
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else if (kc == ALLEGRO_KEY_PGUP) nk_input_key(ctx, NK_KEY_SCROLL_UP, down);
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else if (kc == ALLEGRO_KEY_PGDN) nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
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else if (kc == ALLEGRO_KEY_HOME) {
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nk_input_key(ctx, NK_KEY_TEXT_START, down);
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nk_input_key(ctx, NK_KEY_SCROLL_START, down);
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} else if (kc == ALLEGRO_KEY_END) {
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nk_input_key(ctx, NK_KEY_TEXT_END, down);
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nk_input_key(ctx, NK_KEY_SCROLL_END, down);
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}
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} break;
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case ALLEGRO_EVENT_KEY_CHAR: {
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if (ev->keyboard.display != allegro5.dsp) {
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return;
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}
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int kc = ev->keyboard.keycode;
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int control_mask = (ev->keyboard.modifiers & ALLEGRO_KEYMOD_CTRL) ||
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(ev->keyboard.modifiers & ALLEGRO_KEYMOD_COMMAND);
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if (kc == ALLEGRO_KEY_C && control_mask) {
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nk_input_key(ctx, NK_KEY_COPY, 1);
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} else if (kc == ALLEGRO_KEY_V && control_mask) {
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nk_input_key(ctx, NK_KEY_PASTE, 1);
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} else if (kc == ALLEGRO_KEY_X && control_mask) {
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nk_input_key(ctx, NK_KEY_CUT, 1);
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} else if (kc == ALLEGRO_KEY_Z && control_mask) {
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nk_input_key(ctx, NK_KEY_TEXT_UNDO, 1);
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} else if (kc == ALLEGRO_KEY_R && control_mask) {
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nk_input_key(ctx, NK_KEY_TEXT_REDO, 1);
|
|
} else if (kc == ALLEGRO_KEY_A && control_mask) {
|
|
nk_input_key(ctx, NK_KEY_TEXT_SELECT_ALL, 1);
|
|
}
|
|
else {
|
|
|
|
if (kc != ALLEGRO_KEY_BACKSPACE &&
|
|
kc != ALLEGRO_KEY_LEFT &&
|
|
kc != ALLEGRO_KEY_RIGHT &&
|
|
kc != ALLEGRO_KEY_UP &&
|
|
kc != ALLEGRO_KEY_DOWN &&
|
|
kc != ALLEGRO_KEY_HOME &&
|
|
kc != ALLEGRO_KEY_DELETE &&
|
|
kc != ALLEGRO_KEY_ENTER &&
|
|
kc != ALLEGRO_KEY_END &&
|
|
kc != ALLEGRO_KEY_ESCAPE &&
|
|
kc != ALLEGRO_KEY_PGDN &&
|
|
kc != ALLEGRO_KEY_PGUP) {
|
|
nk_input_unicode(ctx, ev->keyboard.unichar);
|
|
}
|
|
}
|
|
|
|
} break;
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
NK_INTERN void
|
|
nk_allegro5_clipboard_paste(nk_handle usr, struct nk_text_edit *edit)
|
|
{
|
|
char *text = al_get_clipboard_text(allegro5.dsp);
|
|
if (text) nk_textedit_paste(edit, text, nk_strlen(text));
|
|
(void)usr;
|
|
al_free(text);
|
|
}
|
|
|
|
NK_INTERN void
|
|
nk_allegro5_clipboard_copy(nk_handle usr, const char *text, int len)
|
|
{
|
|
char *str = 0;
|
|
(void)usr;
|
|
if (!len) return;
|
|
str = (char*)malloc((size_t)len+1);
|
|
if (!str) return;
|
|
memcpy(str, text, (size_t)len);
|
|
str[len] = '\0';
|
|
al_set_clipboard_text(allegro5.dsp, str);
|
|
free(str);
|
|
}
|
|
|
|
NK_API struct nk_context*
|
|
nk_allegro5_init(NkAllegro5Font *allegro5font, ALLEGRO_DISPLAY *dsp,
|
|
unsigned int width, unsigned int height,
|
|
void (*open_keyboard_func)(void), void (*close_keyboard_func)(void))
|
|
{
|
|
if (!al_init_primitives_addon()) {
|
|
fprintf(stdout, "Unable to initialize required allegro5 primitives addon\n");
|
|
exit(1);
|
|
}
|
|
|
|
struct nk_user_font *font = &allegro5font->nk;
|
|
font->userdata = nk_handle_ptr(allegro5font);
|
|
font->height = (float)allegro5font->height;
|
|
font->width = nk_allegro5_font_get_text_width;
|
|
|
|
allegro5.dsp = dsp;
|
|
allegro5.width = width;
|
|
allegro5.height = height;
|
|
allegro5.is_touch_down = 0;
|
|
allegro5.touch_down_id = -1;
|
|
|
|
nk_init_default(&allegro5.ctx, font);
|
|
allegro5.ctx.clip.copy = nk_allegro5_clipboard_copy;
|
|
allegro5.ctx.clip.paste = nk_allegro5_clipboard_paste;
|
|
allegro5.ctx.clip.userdata = nk_handle_ptr(0);
|
|
#ifdef NK_INCLUDE_DYNAMIC_SOFT_KEYBOARD
|
|
allegro5.ctx.open_keyboard = open_keyboard_func;
|
|
allegro5.ctx.close_keyboard = close_keyboard_func;
|
|
#endif
|
|
return &allegro5.ctx;
|
|
}
|
|
|
|
NK_API
|
|
void nk_allegro5_shutdown(void)
|
|
{
|
|
nk_free(&allegro5.ctx);
|
|
memset(&allegro5, 0, sizeof(allegro5));
|
|
}
|
|
|
|
#endif /* NK_ALLEGRO5_IMPLEMENTATION */
|