Mercurial > hg > ascension / file comparison

comparison: src/core.c

src/core.c

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1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 * Copyright 2023 Mike Becker. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "ascension/core.h"
29 #include "ascension/utils.h"
30
31 #include <cx/linked_list.h>
32 #include <cx/printf.h>
33
34 static void asc_gl_debug_callback(
35 GLenum source, GLenum type, GLuint id, GLenum severity,
36 GLsizei length, const GLchar* message,
37 const void* userParam
38 ) {
39 cxmutstr buf = cx_asprintf(
40 "source = %d, id = %u, type = %d, severity= %d, message = %.*s",
41 source, id, type, severity, length, message);
42 if (type == GL_DEBUG_TYPE_ERROR) {
43 asc_error(buf.ptr);
44 } else {
45 asc_dprintf("GL debug: %*.s", (int)buf.length, buf.ptr);
46 }
47 cx_strfree(&buf);
48 }
49
50 AscContext asc_context;
51
52 // forward declarations
53 static void asc_window_destroy_impl(AscWindow* window);
54
55 void asc_context_initialize(void) {
56 if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))
57 return;
58 asc_clear_flag(&asc_context.flags, ASC_FLAG_HAS_ERROR);
59
60 // initialize error buffer
61 cxBufferInit(
62 &asc_context.error_buffer,
63 NULL,
64 256,
65 NULL,
66 CX_BUFFER_AUTO_EXTEND
67 );
68
69 // initialize lists
70 asc_context.windows = cxLinkedListCreateSimple(CX_STORE_POINTERS);
71 asc_context.windows->simple_destructor =
72 (cx_destructor_func)asc_window_destroy_impl;
73
74 // initialize SDL
75 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
76 asc_error(SDL_GetError());
77 } else {
78 if (TTF_Init() < 0) {
79 asc_error(TTF_GetError());
80 }
81 }
82 SDL_ClearError();
83 asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED);
84 asc_dprintf("Ascension context initialized.");
85 }
86
87 void asc_context_destroy(void) {
88 // destroy lists
89 cxListDestroy(asc_context.windows);
90
91 // quit SDL
92 if (TTF_WasInit())
93 TTF_Quit();
94 SDL_Quit();
95
96 // destroy the error buffer
97 cxBufferDestroy(&asc_context.error_buffer);
98 asc_context.flags = 0;
99 asc_dprintf("Ascension context destroyed.");
100 }
101
102 void asc_error_cchar(char const* text) {
103 asc_error_cxstr(cx_str(text));
104 }
105
106 void asc_error_cuchar(unsigned char const* text) {
107 asc_error_cxstr(cx_str((char const*)text));
108 }
109
110 void asc_error_cxstr(cxstring text) {
111 if (text.length == 0) return;
112
113 // write error to debug output
114 asc_dprintf("ERROR: %*.s", (int)text.length, text.ptr);
115
116 // write error to buffer
117 CxBuffer* buf = &asc_context.error_buffer;
118 cxBufferWrite(text.ptr, 1, text.length, buf);
119 cxBufferPut(buf, '\n');
120
121 asc_set_flag(&asc_context.flags, ASC_FLAG_HAS_ERROR);
122 }
123
124 bool asc_has_error(void) {
125 return asc_test_flag(asc_context.flags, ASC_FLAG_HAS_ERROR);
126 }
127
128 char const* asc_get_error(void) {
129 // we zero-terminate the current buffer contents before providing them
130 cxBufferPut(&asc_context.error_buffer, 0);
131 --asc_context.error_buffer.pos;
132 --asc_context.error_buffer.size;
133 return asc_context.error_buffer.space;
134 }
135
136 void asc_clear_error(void) {
137 cxBufferClear(&asc_context.error_buffer);
138 asc_clear_flag(&asc_context.flags, ASC_FLAG_HAS_ERROR);
139 }
140
141 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {
142 CxIterator iter = cxListIterator(asc_context.windows);
143 cx_foreach(AscWindow*, w, iter) {
144 if (w->id == id) {
145 w->width = width;
146 w->height = height;
147 return;
148 }
149 }
150 }
151
152 bool asc_loop_next(void) {
153 // dispatch SDL events
154 SDL_Event event;
155 while (SDL_PollEvent(&event)) {
156 switch (event.type) {
157 case SDL_QUIT:return false;
158 case SDL_WINDOWEVENT: {
159 if (event.window.type == SDL_WINDOWEVENT_RESIZED)
160 asc_event_window_resized(
161 event.window.windowID,
162 event.window.data1,
163 event.window.data2
164 );
165 break;
166 }
167 case SDL_KEYDOWN:
168 // TODO: remove this code and implement key press map instead
169 if (event.key.keysym.sym == SDLK_ESCAPE)
170 return false;
171 break;
172 case SDL_KEYUP:
173 // TODO: implement key press map
174 break;
175 }
176 }
177
178 // sync the windows
179 CxMutIterator windows = cxListMutIterator(asc_context.windows);
180 cx_foreach(AscWindow*, w, windows) {
181 asc_window_sync(w);
182 }
183 return true;
184 }
185
186 void asc_window_settings_init_defaults(AscWindowSettings* settings) {
187 settings->depth_size = 24;
188 settings->vsync = 1;
189 settings->width = 800;
190 settings->height = 600;
191 settings->fullscreen = 0;
192 settings->gl_major_version = 3;
193 settings->gl_minor_version = 3;
194 settings->title = "Ascended Window";
195 }
196
197 void asc_window_initialize(AscWindow* window, AscWindowSettings const* settings) {
198 Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
199 flags |= settings->fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;
200
201 window->window = SDL_CreateWindow(
202 settings->title,
203 SDL_WINDOWPOS_CENTERED,
204 SDL_WINDOWPOS_CENTERED,
205 settings->width,
206 settings->height,
207 flags
208 );
209 if (window->window == NULL) {
210 asc_error(SDL_GetError());
211 return;
212 }
213
214 window->id = SDL_GetWindowID(window->window);
215 SDL_GetWindowSize(window->window, &window->width, &window->height);
216
217 SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
218 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version);
219 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, settings->gl_minor_version);
220 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, settings->depth_size);
221 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
222 window->glctx = SDL_GL_CreateContext(window->window);
223 if (window->glctx == NULL) {
224 asc_dprintf("Creating GL context failed for window %u", window->id);
225 } else {
226 glewExperimental = GL_TRUE;
227 GLenum err = glewInit();
228 if (err == GLEW_OK) {
229 SDL_GL_SetSwapInterval(settings->vsync);
230 glEnable(GL_DEPTH_TEST);
231 glEnable(GL_BLEND);
232 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
233 glEnable(GL_DEBUG_OUTPUT);
234 glDebugMessageCallback(asc_gl_debug_callback, NULL);
235 asc_dprintf("Window %u initialized", window->id);
236 cxListAdd(asc_context.windows, window);
237 return;
238 } else {
239 asc_error(glewGetErrorString(err));
240 }
241 }
242
243 // cleanup on error
244 if (window->glctx != NULL) {
245 SDL_GL_DeleteContext(window->glctx);
246 }
247 window->glctx = NULL;
248 SDL_DestroyWindow(window->window);
249 window->window = NULL;
250 window->id = 0;
251 }
252
253 void asc_window_destroy_impl(AscWindow* window) {
254 // destory the GL context and the window
255 if (window->glctx != NULL) {
256 SDL_GL_DeleteContext(window->glctx);
257 }
258 if (window->window != NULL) {
259 SDL_DestroyWindow(window->window);
260 }
261
262 // clean the data
263 asc_dprintf("Window %u and its OpenGL context destroyed.", window->id);
264 memset(window, 0, sizeof(AscWindow));
265 }
266
267 void asc_window_destroy(AscWindow* window) {
268 // find the window in the context and remove it
269 CxMutIterator iter = cxListMutIterator(asc_context.windows);
270 cx_foreach(AscWindow*, w, iter) {
271 if (w == window) {
272 asc_dprintf("Window %u removed from context.", window->id);
273 cxIteratorFlagRemoval(iter);
274 }
275 }
276 asc_window_destroy_impl(window);
277 }
278
279 void asc_window_sync(AscWindow const* window) {
280 SDL_GL_MakeCurrent(window->window, window->glctx);
281 SDL_GL_SwapWindow(window->window);
282 glViewport(0, 0, window->width, window->height);
283 glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
284 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
285 }

Mercurial Repository: ascension

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