ascension: src/context.c@d3285aed65b3

     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  */

    28 #include "ascension/context.h"

    29 #include "ascension/error.h"

    30 #include "ascension/utils.h"

    31 #include "ascension/shader.h"

    33 #include <SDL2/SDL.h>

    34 #include <SDL2/SDL_ttf.h>

    36 #include <time.h>

    38 AscContext asc_context;

    40 static uint64_t asc_nanos(void) {

    41     struct timespec ts;

    42     clock_gettime(CLOCK_MONOTONIC, &ts);

    43     return 1000000000ull*(uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec;

    44 }

    46 void asc_context_initialize(void) {

    47     if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))

    48         return;

    49     memset(&asc_context, 0, sizeof(AscContext));

    51     // initialize error buffer

    52     cxBufferInit(

    53             &asc_context.error_buffer,

    54             NULL,

    55             256,

    56             NULL,

    57             CX_BUFFER_AUTO_EXTEND

    58     );

    60     // initialize SDL

    61     if (SDL_Init(SDL_INIT_VIDEO) < 0) {

    62         asc_error(SDL_GetError());

    63     } else {

    64         if (TTF_Init() < 0) {

    65             asc_error(TTF_GetError());

    66         }

    67     }

    68     SDL_ClearError();

    69     asc_context.total_nanos = asc_nanos();

    70     asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED);

    71     asc_dprintf("Ascension context initialized.");

    72 }

    74 void asc_context_destroy(void) {

    75     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

    76         asc_window_destroy(&asc_context.windows[i]);

    77     }

    78     asc_font_cache_clear();

    80     // quit SDL

    81     if (TTF_WasInit())

    82         TTF_Quit();

    83     SDL_Quit();

    85     // destroy the error buffer

    86     cxBufferDestroy(&asc_context.error_buffer);

    87     asc_context.flags = 0;

    88     asc_dprintf("Ascension context destroyed.");

    89 }

    91 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {

    92     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

    93         if (asc_context.windows[i].id == id) {

    94             asc_vec2i dimensions = (asc_vec2i) {width, height};

    95             asc_context.windows[i].resized = true;

    96             asc_context.windows[i].dimensions = dimensions;

    97             asc_context.windows[i].ui.viewport.size = dimensions;

    98             asc_context.windows[i].ui.cameras[0].rect.size = dimensions;

    99             return;

   100         }

   101     }

   102 }

   104 bool asc_loop_next(void) {

   105     // dispatch SDL events

   106     SDL_Event event;

   107     while (SDL_PollEvent(&event)) {

   108         switch (event.type) {

   109             case SDL_QUIT:

   110                 asc_set_flag(&asc_context.flags, ASC_FLAG_QUIT);

   111                 break;

   112             case SDL_WINDOWEVENT: {

   113                 if (event.window.event == SDL_WINDOWEVENT_RESIZED)

   114                     asc_event_window_resized(

   115                             event.window.windowID,

   116                             event.window.data1,

   117                             event.window.data2

   118                     );

   119                 break;

   120             }

   121             case SDL_KEYDOWN:

   122                 // TODO: remove this code and implement key press map instead

   123                 if (event.key.keysym.sym == SDLK_ESCAPE)

   124                     return false;

   125                 break;

   126             case SDL_KEYUP:

   127                 // TODO: implement key press map

   128                 break;

   129         }

   130     }

   132     // sync the windows

   133     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

   134         if (asc_context.windows[i].id > 0) {

   135             asc_window_sync(&asc_context.windows[i]);

   136         }

   137     }

   139     // compute frame time

   140     uint64_t frame_nanos, ns;

   141     do {

   142         ns = asc_nanos();

   143         frame_nanos = ns - asc_context.total_nanos;

   144     } while (frame_nanos == 0);

   145     asc_context.frame_nanos = frame_nanos;

   146     asc_context.total_nanos = ns;

   148     return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT);

   149 }

Mercurial > hg > ascension / file revision