ascension: src/context.c@6d100092fcd4

     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"

    32 #include <SDL2/SDL.h>

    33 #include <SDL2/SDL_ttf.h>

    35 #include <time.h>

    37 AscContext asc_context;

    39 static uint64_t asc_nanos(void) {

    40     struct timespec ts;

    41     clock_gettime(CLOCK_MONOTONIC, &ts);

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

    43 }

    45 void asc_context_initialize(void) {

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

    47         return;

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

    50     // initialize error buffer

    51     cxBufferInit(

    52             &asc_context.error_buffer,

    53             NULL,

    54             256,

    55             NULL,

    56             CX_BUFFER_AUTO_EXTEND

    57     );

    59     // initialize SDL

    60     if (SDL_Init(SDL_INIT_VIDEO) < 0) {

    61         asc_error(SDL_GetError());

    62     } else {

    63         if (TTF_Init() < 0) {

    64             asc_error(TTF_GetError());

    65         }

    66     }

    67     SDL_ClearError();

    68     asc_context.total_nanos = asc_nanos();

    69     asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED);

    70     asc_dprintf("Ascension context initialized.");

    71 }

    73 void asc_context_destroy(void) {

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

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

    76     }

    77     asc_font_cache_clear();

    79     // quit SDL

    80     if (TTF_WasInit())

    81         TTF_Quit();

    82     SDL_Quit();

    84     // destroy the error buffer

    85     cxBufferDestroy(&asc_context.error_buffer);

    86     asc_context.flags = 0;

    87     asc_dprintf("Ascension context destroyed.");

    88 }

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

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

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

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

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

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

    96             return;

    97         }

    98     }

    99 }

   101 bool asc_loop_next(void) {

   102     // dispatch SDL events

   103     SDL_Event event;

   104     while (SDL_PollEvent(&event)) {

   105         switch (event.type) {

   106             case SDL_QUIT:

   107                 asc_set_flag(&asc_context.flags, ASC_FLAG_QUIT);

   108                 break;

   109             case SDL_WINDOWEVENT: {

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

   111                     asc_event_window_resized(

   112                             event.window.windowID,

   113                             event.window.data1,

   114                             event.window.data2

   115                     );

   116                 break;

   117             }

   118             case SDL_KEYDOWN:

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

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

   121                     return false;

   122                 break;

   123             case SDL_KEYUP:

   124                 // TODO: implement key press map

   125                 break;

   126         }

   127     }

   129     // sync the windows

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

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

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

   133         }

   134     }

   136     // compute frame time

   137     uint64_t frame_nanos, ns;

   138     do {

   139         ns = asc_nanos();

   140         frame_nanos = ns - asc_context.total_nanos;

   141     } while (frame_nanos == 0);

   142     asc_context.frame_nanos = frame_nanos;

   143     asc_context.total_nanos = ns;

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

   146 }

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