1 /*
2  * Nuklear - 1.32.0 - public domain
3  * no warrenty implied; use at your own risk.
4  * authored from 2015-2016 by Micha Mettke
5  */
6 /*
7  * ==============================================================
8  *
9  *                              API
10  *
11  * ===============================================================
12  */
13 #ifndef NK_SFML_GL2_H_
14 #define NK_SFML_GL2_H_
15 
16 #include <SFML/Window.hpp>
17 
18 NK_API struct nk_context*   nk_sfml_init(sf::Window* window);
19 NK_API void                 nk_sfml_font_stash_begin(struct nk_font_atlas** atlas);
20 NK_API void                 nk_sfml_font_stash_end(void);
21 NK_API int                  nk_sfml_handle_event(sf::Event* event);
22 NK_API void                 nk_sfml_render(enum nk_anti_aliasing);
23 NK_API void                 nk_sfml_shutdown(void);
24 
25 #endif
26 /*
27  * ==============================================================
28  *
29  *                          IMPLEMENTATION
30  *
31  * ===============================================================
32  */
33  #ifdef NK_SFML_GL2_IMPLEMENTATION
34 
35 struct nk_sfml_device {
36     struct nk_buffer cmds;
37     struct nk_draw_null_texture null;
38     GLuint font_tex;
39 };
40 
41 struct nk_sfml_vertex {
42     float position[2];
43     float uv[2];
44     nk_byte col[4];
45 };
46 
47 static struct nk_sfml {
48     sf::Window* window;
49     struct nk_sfml_device ogl;
50     struct nk_context ctx;
51     struct nk_font_atlas atlas;
52 } sfml;
53 
54 NK_INTERN void
nk_sfml_device_upload_atlas(const void * image,int width,int height)55 nk_sfml_device_upload_atlas(const void* image, int width, int height)
56 {
57     struct nk_sfml_device* dev = &sfml.ogl;
58     glGenTextures(1, &dev->font_tex);
59     glBindTexture(GL_TEXTURE_2D, dev->font_tex);
60     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
61     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
62     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)width, (GLsizei)height, 0,
63                 GL_RGBA, GL_UNSIGNED_BYTE, image);
64 }
65 
66 NK_API void
nk_sfml_render(enum nk_anti_aliasing AA)67 nk_sfml_render(enum nk_anti_aliasing AA)
68 {
69     /* setup global state */
70     struct nk_sfml_device* dev = &sfml.ogl;
71 
72     int window_width = sfml.window->getSize().x;
73     int window_height = sfml.window->getSize().y;
74 
75     glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
76     glDisable(GL_CULL_FACE);
77     glDisable(GL_DEPTH_TEST);
78     glEnable(GL_SCISSOR_TEST);
79     glEnable(GL_BLEND);
80     glEnable(GL_TEXTURE_2D);
81     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
82 
83     glViewport(0, 0, (GLsizei)window_width, (GLsizei)window_height);
84     glMatrixMode(GL_TEXTURE);
85     glPushMatrix();
86     glLoadIdentity();
87     glMatrixMode(GL_PROJECTION);
88     glPushMatrix();
89     glLoadIdentity();
90     glOrtho(0.0f, window_width, window_height, 0.0f, -1.0f, 1.0f);
91     glMatrixMode(GL_MODELVIEW);
92     glPushMatrix();
93     glLoadIdentity();
94 
95     glEnableClientState(GL_VERTEX_ARRAY);
96     glEnableClientState(GL_TEXTURE_COORD_ARRAY);
97     glEnableClientState(GL_COLOR_ARRAY);
98     {
99         GLsizei vs = sizeof(struct nk_sfml_vertex);
100         size_t vp = offsetof(struct nk_sfml_vertex, position);
101         size_t vt = offsetof(struct nk_sfml_vertex, uv);
102         size_t vc = offsetof(struct nk_sfml_vertex, col);
103 
104         /* convert from command queue into draw  list and draw to screen */
105         const struct nk_draw_command* cmd;
106         const nk_draw_index* offset = NULL;
107         struct nk_buffer vbuf, ebuf;
108 
109         /* fill converting configuration */
110         struct nk_convert_config config;
111         static const struct nk_draw_vertex_layout_element vertex_layout[] = {
112             {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sfml_vertex, position)},
113             {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct nk_sfml_vertex, uv)},
114             {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct nk_sfml_vertex, col)},
115             {NK_VERTEX_LAYOUT_END}
116         };
117         NK_MEMSET(&config, 0, sizeof(config));
118         config.vertex_layout = vertex_layout;
119         config.vertex_size = sizeof(struct nk_sfml_vertex);
120         config.vertex_alignment = NK_ALIGNOF(struct nk_sfml_vertex);
121         config.null = dev->null;
122         config.circle_segment_count = 22;
123         config.curve_segment_count = 22;
124         config.arc_segment_count = 22;
125         config.global_alpha = 1.0f;
126         config.shape_AA = AA;
127         config.line_AA = AA;
128 
129         /* convert shapes into vertices */
130         nk_buffer_init_default(&vbuf);
131         nk_buffer_init_default(&ebuf);
132         nk_convert(&sfml.ctx, &dev->cmds, &vbuf, &ebuf, &config);
133 
134         /* setup vertex buffer pointer */
135         const void* vertices = nk_buffer_memory_const(&vbuf);
136         glVertexPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vp));
137         glTexCoordPointer(2, GL_FLOAT, vs, (const void*)((const nk_byte*)vertices + vt));
138         glColorPointer(4, GL_UNSIGNED_BYTE, vs, (const void*)((const nk_byte*)vertices + vc));
139 
140         /* iterate over and execute each draw command */
141         offset = (const nk_draw_index*)nk_buffer_memory_const(&ebuf);
142         nk_draw_foreach(cmd, &sfml.ctx, &dev->cmds)
143         {
144             if(!cmd->elem_count) continue;
145             glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
146             glScissor(
147                 (GLint)(cmd->clip_rect.x),
148                 (GLint)((window_height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h))),
149                 (GLint)(cmd->clip_rect.w),
150                 (GLint)(cmd->clip_rect.h));
151             glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
152             offset += cmd->elem_count;
153         }
154         nk_clear(&sfml.ctx);
155         nk_buffer_free(&vbuf);
156         nk_buffer_free(&ebuf);
157     }
158 
159     /* default OpenGL state */
160     glDisableClientState(GL_VERTEX_ARRAY);
161     glDisableClientState(GL_TEXTURE_COORD_ARRAY);
162     glDisableClientState(GL_COLOR_ARRAY);
163 
164     glDisable(GL_CULL_FACE);
165     glDisable(GL_DEPTH_TEST);
166     glDisable(GL_SCISSOR_TEST);
167     glDisable(GL_BLEND);
168     glDisable(GL_TEXTURE_2D);
169 
170     glBindTexture(GL_TEXTURE_2D, 0);
171     glMatrixMode(GL_TEXTURE);
172     glPopMatrix();
173     glMatrixMode(GL_MODELVIEW);
174     glPopMatrix();
175     glMatrixMode(GL_PROJECTION);
176     glPopMatrix();
177     glPopAttrib();
178 }
179 
180 static void
nk_sfml_clipboard_paste(nk_handle usr,struct nk_text_edit * edit)181 nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
182 {
183 #if 0
184     /* Not Implemented in SFML */
185     sf::Clipboard clipboard(sfml.window);
186     const char* text = clipboard.getText();
187 
188     if(text)
189         nk_textedit_paste(edit, text, nk_strlen(text));
190         (void)usr;
191 #endif
192 }
193 
194 static void
nk_sfml_clipboard_copy(nk_handle usr,const char * text,int len)195 nk_sfml_clipboard_copy(nk_handle usr, const char* text, int len)
196 {
197 #if 0
198     char* str = 0;
199     (void)usr;
200     if(!len) return;
201     str = (char*)malloc((size_t)len+1);
202     if(!str) return;
203     memcpy(str, text, (size_t)len);
204     str[len] = '\0';
205 
206     /* Not Implemented in SFML */
207     sf::Clipboard clipboard(sfml.window);
208     clipboard.setText(str);
209     free(str);
210 #endif
211 }
212 
213 NK_API struct nk_context*
nk_sfml_init(sf::Window * window)214 nk_sfml_init(sf::Window* window)
215 {
216     sfml.window = window;
217     nk_init_default(&sfml.ctx, 0);
218     sfml.ctx.clip.copy = nk_sfml_clipboard_copy;
219     sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
220     sfml.ctx.clip.userdata = nk_handle_ptr(0);
221     nk_buffer_init_default(&sfml.ogl.cmds);
222     return &sfml.ctx;
223 }
224 
225 NK_API void
nk_sfml_font_stash_begin(struct nk_font_atlas ** atlas)226 nk_sfml_font_stash_begin(struct nk_font_atlas** atlas)
227 {
228     nk_font_atlas_init_default(&sfml.atlas);
229     nk_font_atlas_begin(&sfml.atlas);
230     *atlas = &sfml.atlas;
231 }
232 
233 NK_API void
nk_sfml_font_stash_end()234 nk_sfml_font_stash_end()
235 {
236     int w, h;
237     const void* img;
238     img = nk_font_atlas_bake(&sfml.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
239     nk_sfml_device_upload_atlas(img, w, h);
240     nk_font_atlas_end(&sfml.atlas, nk_handle_id((int)sfml.ogl.font_tex), &sfml.ogl.null);
241     if(sfml.atlas.default_font)
242         nk_style_set_font(&sfml.ctx, &sfml.atlas.default_font->handle);
243 }
244 
245 NK_API int
nk_sfml_handle_event(sf::Event * evt)246 nk_sfml_handle_event(sf::Event* evt)
247 {
248     struct nk_context* ctx = &sfml.ctx;
249     /* optional grabbing behavior */
250     if(ctx->input.mouse.grab)
251         ctx->input.mouse.grab = 0;
252     else if(ctx->input.mouse.ungrab) {
253         int x = (int)ctx->input.mouse.prev.x;
254         int y = (int)ctx->input.mouse.prev.y;
255         sf::Mouse::setPosition(sf::Vector2i(x, y), *sfml.window);
256         ctx->input.mouse.ungrab = 0;
257     }
258     if(evt->type == sf::Event::KeyReleased || evt->type == sf::Event::KeyPressed)
259     {
260         int down = evt->type == sf::Event::KeyPressed;
261         sf::Keyboard::Key key = evt->key.code;
262         if(key == sf::Keyboard::RShift || key == sf::Keyboard::LShift)
263             nk_input_key(ctx, NK_KEY_SHIFT, down);
264         else if(key == sf::Keyboard::Delete)
265             nk_input_key(ctx, NK_KEY_DEL, down);
266         else if(key == sf::Keyboard::Return)
267             nk_input_key(ctx, NK_KEY_ENTER, down);
268         else if(key == sf::Keyboard::Tab)
269             nk_input_key(ctx, NK_KEY_TAB, down);
270         else if(key == sf::Keyboard::BackSpace)
271             nk_input_key(ctx, NK_KEY_BACKSPACE, down);
272         else if(key == sf::Keyboard::Home) {
273             nk_input_key(ctx, NK_KEY_TEXT_START, down);
274             nk_input_key(ctx, NK_KEY_SCROLL_START, down);
275         } else if(key == sf::Keyboard::End) {
276             nk_input_key(ctx, NK_KEY_TEXT_END, down);
277             nk_input_key(ctx, NK_KEY_SCROLL_END, down);
278         } else if(key == sf::Keyboard::PageDown)
279             nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
280         else if(key == sf::Keyboard::PageUp)
281             nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
282         else if(key == sf::Keyboard::Z)
283             nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
284         else if(key == sf::Keyboard::R)
285             nk_input_key(ctx, NK_KEY_TEXT_REDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
286         else if(key == sf::Keyboard::C)
287             nk_input_key(ctx, NK_KEY_COPY, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
288         else if(key == sf::Keyboard::V)
289             nk_input_key(ctx, NK_KEY_PASTE, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
290         else if(key == sf::Keyboard::X)
291             nk_input_key(ctx, NK_KEY_CUT, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
292         else if(key == sf::Keyboard::B)
293             nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
294         else if(key == sf::Keyboard::E)
295             nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
296         else if(key == sf::Keyboard::Up)
297             nk_input_key(ctx, NK_KEY_UP, down);
298         else if(key == sf::Keyboard::Down)
299             nk_input_key(ctx, NK_KEY_DOWN, down);
300         else if(key == sf::Keyboard::Left) {
301             if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
302                 nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
303             else nk_input_key(ctx, NK_KEY_LEFT, down);
304         } else if(key == sf::Keyboard::Right) {
305             if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
306                 nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
307             else nk_input_key(ctx, NK_KEY_RIGHT, down);
308         } else return 0;
309         return 1;
310     } else if(evt->type == sf::Event::MouseButtonPressed || evt->type == sf::Event::MouseButtonReleased) {
311         int down = evt->type == sf::Event::MouseButtonPressed;
312         const int x = evt->mouseButton.x, y = evt->mouseButton.y;
313         if(evt->mouseButton.button == sf::Mouse::Left)
314             nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
315         if(evt->mouseButton.button == sf::Mouse::Middle)
316             nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
317         if(evt->mouseButton.button == sf::Mouse::Right)
318             nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
319         else return 0;
320         return 1;
321     } else if(evt->type == sf::Event::MouseMoved) {
322         nk_input_motion(ctx, evt->mouseMove.x, evt->mouseMove.y);
323         return 1;
324     } else if(evt->type == sf::Event::TouchBegan || evt->type == sf::Event::TouchEnded) {
325         int down = evt->type == sf::Event::TouchBegan;
326         const int x = evt->touch.x, y = evt->touch.y;
327 		ctx->input.mouse.pos.x = x;
328 		ctx->input.mouse.pos.y = y;
329         nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
330         return 1;
331     } else if(evt->type == sf::Event::TouchMoved) {
332         if(ctx->input.mouse.grabbed) {
333             int x = (int)ctx->input.mouse.prev.x;
334             int y = (int)ctx->input.mouse.prev.y;
335             nk_input_motion(ctx, x + evt->touch.x, y + evt->touch.y);
336         } else nk_input_motion(ctx, evt->touch.x, evt->touch.y);
337         return 1;
338     } else if(evt->type == sf::Event::TextEntered) {
339         nk_input_unicode(ctx, evt->text.unicode);
340         return 1;
341     } else if(evt->type == sf::Event::MouseWheelScrolled) {
342         nk_input_scroll(ctx, nk_vec2(0,evt->mouseWheelScroll.delta));
343         return 1;
344     }
345     return 0;
346 }
347 
348 NK_API
nk_sfml_shutdown(void)349 void nk_sfml_shutdown(void)
350 {
351     struct nk_sfml_device* dev = &sfml.ogl;
352     nk_font_atlas_clear(&sfml.atlas);
353     nk_free(&sfml.ctx);
354     glDeleteTextures(1, &dev->font_tex);
355     nk_buffer_free(&dev->cmds);
356     memset(&sfml, 0, sizeof(sfml));
357 }
358 
359 #endif
360