ascension: src/context.c@8acde7d27904

     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 AscContext asc_context;

    38 void asc_context_initialize(void) {

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

    40         return;

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

    43     // initialize error buffer

    44     cxBufferInit(

    45             &asc_context.error_buffer,

    46             NULL,

    47             256,

    48             NULL,

    49             CX_BUFFER_AUTO_EXTEND

    50     );

    52     // initialize SDL

    53     if (SDL_Init(SDL_INIT_VIDEO) < 0) {

    54         asc_error(SDL_GetError());

    55     } else {

    56         if (TTF_Init() < 0) {

    57             asc_error(TTF_GetError());

    58         }

    59     }

    60     SDL_ClearError();

    61     asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED);

    62     asc_dprintf("Ascension context initialized.");

    63 }

    65 void asc_context_destroy(void) {

    66     asc_shader_destroy_predefined();

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

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

    69     }

    70     asc_font_cache_clear();

    72     // quit SDL

    73     if (TTF_WasInit())

    74         TTF_Quit();

    75     SDL_Quit();

    77     // destroy the error buffer

    78     cxBufferDestroy(&asc_context.error_buffer);

    79     asc_context.flags = 0;

    80     asc_dprintf("Ascension context destroyed.");

    81 }

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

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

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

    86             asc_context.windows[i].dimensions.width = width;

    87             asc_context.windows[i].dimensions.height = height;

    88             asc_mat4f_ortho(asc_context.windows[i].projection, 0, (float) width, (float) height, 0);

    89             return;

    90         }

    91     }

    92 }

    94 bool asc_loop_next(void) {

    95     // dispatch SDL events

    96     SDL_Event event;

    97     while (SDL_PollEvent(&event)) {

    98         switch (event.type) {

    99             case SDL_QUIT:

   100                 asc_set_flag(&asc_context.flags, ASC_FLAG_QUIT);

   101                 break;

   102             case SDL_WINDOWEVENT: {

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

   104                     asc_event_window_resized(

   105                             event.window.windowID,

   106                             event.window.data1,

   107                             event.window.data2

   108                     );

   109                 break;

   110             }

   111             case SDL_KEYDOWN:

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

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

   114                     return false;

   115                 break;

   116             case SDL_KEYUP:

   117                 // TODO: implement key press map

   118                 break;

   119         }

   120     }

   122     // sync the windows

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

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

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

   126         }

   127     }

   129     // compute frame time

   130     static Uint32 ticks;

   131     Uint32 ticks_elapsed = SDL_GetTicks() - ticks;

   132     ticks = SDL_GetTicks();

   133     asc_context.elapsed_millis = ticks_elapsed;

   134     asc_context.elapsed = (float) ticks_elapsed / 1000.0f;

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

   137 }

Mercurial > hg > ascension / file revision