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 = NK_OFFSETOF(struct nk_sfml_vertex, position);
101 size_t vt = NK_OFFSETOF(struct nk_sfml_vertex, uv);
102 size_t vc = NK_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 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_clear(&dev->cmds);
156 nk_buffer_free(&vbuf);
157 nk_buffer_free(&ebuf);
158 }
159
160 /* default OpenGL state */
161 glDisableClientState(GL_VERTEX_ARRAY);
162 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
163 glDisableClientState(GL_COLOR_ARRAY);
164
165 glDisable(GL_CULL_FACE);
166 glDisable(GL_DEPTH_TEST);
167 glDisable(GL_SCISSOR_TEST);
168 glDisable(GL_BLEND);
169 glDisable(GL_TEXTURE_2D);
170
171 glBindTexture(GL_TEXTURE_2D, 0);
172 glMatrixMode(GL_TEXTURE);
173 glPopMatrix();
174 glMatrixMode(GL_MODELVIEW);
175 glPopMatrix();
176 glMatrixMode(GL_PROJECTION);
177 glPopMatrix();
178 glPopAttrib();
179 }
180
181 static void
nk_sfml_clipboard_paste(nk_handle usr,struct nk_text_edit * edit)182 nk_sfml_clipboard_paste(nk_handle usr, struct nk_text_edit* edit)
183 {
184 #if 0
185 /* Not Implemented in SFML */
186 sf::Clipboard clipboard(sfml.window);
187 const char* text = clipboard.getText();
188
189 if(text)
190 nk_textedit_paste(edit, text, nk_strlen(text));
191 (void)usr;
192 #else
193 NK_UNUSED(usr);
194 NK_UNUSED(edit);
195 #endif
196 }
197
198 static void
nk_sfml_clipboard_copy(nk_handle usr,const char * text,int len)199 nk_sfml_clipboard_copy(nk_handle usr, const char* text, int len)
200 {
201 #if 0
202 char* str = 0;
203 (void)usr;
204 if(!len) return;
205 str = (char*)malloc((size_t)len+1);
206 if(!str) return;
207 memcpy(str, text, (size_t)len);
208 str[len] = '\0';
209
210 /* Not Implemented in SFML */
211 sf::Clipboard clipboard(sfml.window);
212 clipboard.setText(str);
213 free(str);
214 #else
215 NK_UNUSED(usr);
216 NK_UNUSED(text);
217 NK_UNUSED(len);
218 #endif
219 }
220
221 NK_API struct nk_context*
nk_sfml_init(sf::Window * window)222 nk_sfml_init(sf::Window* window)
223 {
224 sfml.window = window;
225 nk_init_default(&sfml.ctx, 0);
226 sfml.ctx.clip.copy = nk_sfml_clipboard_copy;
227 sfml.ctx.clip.paste = nk_sfml_clipboard_paste;
228 sfml.ctx.clip.userdata = nk_handle_ptr(0);
229 nk_buffer_init_default(&sfml.ogl.cmds);
230 return &sfml.ctx;
231 }
232
233 NK_API void
nk_sfml_font_stash_begin(struct nk_font_atlas ** atlas)234 nk_sfml_font_stash_begin(struct nk_font_atlas** atlas)
235 {
236 nk_font_atlas_init_default(&sfml.atlas);
237 nk_font_atlas_begin(&sfml.atlas);
238 *atlas = &sfml.atlas;
239 }
240
241 NK_API void
nk_sfml_font_stash_end()242 nk_sfml_font_stash_end()
243 {
244 int w, h;
245 const void* img;
246 img = nk_font_atlas_bake(&sfml.atlas, &w, &h, NK_FONT_ATLAS_RGBA32);
247 nk_sfml_device_upload_atlas(img, w, h);
248 nk_font_atlas_end(&sfml.atlas, nk_handle_id((int)sfml.ogl.font_tex), &sfml.ogl.null);
249 if(sfml.atlas.default_font)
250 nk_style_set_font(&sfml.ctx, &sfml.atlas.default_font->handle);
251 }
252
253 NK_API int
nk_sfml_handle_event(sf::Event * evt)254 nk_sfml_handle_event(sf::Event* evt)
255 {
256 struct nk_context* ctx = &sfml.ctx;
257 /* optional grabbing behavior */
258 if(ctx->input.mouse.grab)
259 ctx->input.mouse.grab = 0;
260 else if(ctx->input.mouse.ungrab) {
261 int x = (int)ctx->input.mouse.prev.x;
262 int y = (int)ctx->input.mouse.prev.y;
263 sf::Mouse::setPosition(sf::Vector2i(x, y), *sfml.window);
264 ctx->input.mouse.ungrab = 0;
265 }
266 if(evt->type == sf::Event::KeyReleased || evt->type == sf::Event::KeyPressed)
267 {
268 int down = evt->type == sf::Event::KeyPressed;
269 sf::Keyboard::Key key = evt->key.code;
270 if(key == sf::Keyboard::RShift || key == sf::Keyboard::LShift)
271 nk_input_key(ctx, NK_KEY_SHIFT, down);
272 else if(key == sf::Keyboard::Delete)
273 nk_input_key(ctx, NK_KEY_DEL, down);
274 else if(key == sf::Keyboard::Return)
275 nk_input_key(ctx, NK_KEY_ENTER, down);
276 else if(key == sf::Keyboard::Tab)
277 nk_input_key(ctx, NK_KEY_TAB, down);
278 else if(key == sf::Keyboard::BackSpace)
279 nk_input_key(ctx, NK_KEY_BACKSPACE, down);
280 else if(key == sf::Keyboard::Home) {
281 nk_input_key(ctx, NK_KEY_TEXT_START, down);
282 nk_input_key(ctx, NK_KEY_SCROLL_START, down);
283 } else if(key == sf::Keyboard::End) {
284 nk_input_key(ctx, NK_KEY_TEXT_END, down);
285 nk_input_key(ctx, NK_KEY_SCROLL_END, down);
286 } else if(key == sf::Keyboard::PageDown)
287 nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
288 else if(key == sf::Keyboard::PageUp)
289 nk_input_key(ctx, NK_KEY_SCROLL_DOWN, down);
290 else if(key == sf::Keyboard::Z)
291 nk_input_key(ctx, NK_KEY_TEXT_UNDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
292 else if(key == sf::Keyboard::R)
293 nk_input_key(ctx, NK_KEY_TEXT_REDO, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
294 else if(key == sf::Keyboard::C)
295 nk_input_key(ctx, NK_KEY_COPY, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
296 else if(key == sf::Keyboard::V)
297 nk_input_key(ctx, NK_KEY_PASTE, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
298 else if(key == sf::Keyboard::X)
299 nk_input_key(ctx, NK_KEY_CUT, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
300 else if(key == sf::Keyboard::B)
301 nk_input_key(ctx, NK_KEY_TEXT_LINE_START, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
302 else if(key == sf::Keyboard::E)
303 nk_input_key(ctx, NK_KEY_TEXT_LINE_END, down && sf::Keyboard::isKeyPressed(sf::Keyboard::LControl));
304 else if(key == sf::Keyboard::Up)
305 nk_input_key(ctx, NK_KEY_UP, down);
306 else if(key == sf::Keyboard::Down)
307 nk_input_key(ctx, NK_KEY_DOWN, down);
308 else if(key == sf::Keyboard::Left) {
309 if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
310 nk_input_key(ctx, NK_KEY_TEXT_WORD_LEFT, down);
311 else nk_input_key(ctx, NK_KEY_LEFT, down);
312 } else if(key == sf::Keyboard::Right) {
313 if(sf::Keyboard::isKeyPressed(sf::Keyboard::LControl))
314 nk_input_key(ctx, NK_KEY_TEXT_WORD_RIGHT, down);
315 else nk_input_key(ctx, NK_KEY_RIGHT, down);
316 } else return 0;
317 return 1;
318 } else if(evt->type == sf::Event::MouseButtonPressed || evt->type == sf::Event::MouseButtonReleased) {
319 int down = evt->type == sf::Event::MouseButtonPressed;
320 const int x = evt->mouseButton.x, y = evt->mouseButton.y;
321 if(evt->mouseButton.button == sf::Mouse::Left)
322 nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
323 if(evt->mouseButton.button == sf::Mouse::Middle)
324 nk_input_button(ctx, NK_BUTTON_MIDDLE, x, y, down);
325 if(evt->mouseButton.button == sf::Mouse::Right)
326 nk_input_button(ctx, NK_BUTTON_RIGHT, x, y, down);
327 else return 0;
328 return 1;
329 } else if(evt->type == sf::Event::MouseMoved) {
330 nk_input_motion(ctx, evt->mouseMove.x, evt->mouseMove.y);
331 return 1;
332 } else if(evt->type == sf::Event::TouchBegan || evt->type == sf::Event::TouchEnded) {
333 int down = evt->type == sf::Event::TouchBegan;
334 const int x = evt->touch.x, y = evt->touch.y;
335 ctx->input.mouse.pos.x = x;
336 ctx->input.mouse.pos.y = y;
337 nk_input_button(ctx, NK_BUTTON_LEFT, x, y, down);
338 return 1;
339 } else if(evt->type == sf::Event::TouchMoved) {
340 if(ctx->input.mouse.grabbed) {
341 int x = (int)ctx->input.mouse.prev.x;
342 int y = (int)ctx->input.mouse.prev.y;
343 nk_input_motion(ctx, x + evt->touch.x, y + evt->touch.y);
344 } else nk_input_motion(ctx, evt->touch.x, evt->touch.y);
345 return 1;
346 } else if(evt->type == sf::Event::TextEntered) {
347 nk_input_unicode(ctx, evt->text.unicode);
348 return 1;
349 } else if(evt->type == sf::Event::MouseWheelScrolled) {
350 nk_input_scroll(ctx, nk_vec2(0,evt->mouseWheelScroll.delta));
351 return 1;
352 }
353 return 0;
354 }
355
356 NK_API
nk_sfml_shutdown(void)357 void nk_sfml_shutdown(void)
358 {
359 struct nk_sfml_device* dev = &sfml.ogl;
360 nk_font_atlas_clear(&sfml.atlas);
361 nk_free(&sfml.ctx);
362 glDeleteTextures(1, &dev->font_tex);
363 nk_buffer_free(&dev->cmds);
364 memset(&sfml, 0, sizeof(sfml));
365 }
366
367 #endif
368