Mercurial > hg > ascension / file revision

 /*

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  * Copyright 2023 Mike Becker. All rights reserved.

  *

  * Redistribution and use in source and binary forms, with or without

  * modification, are permitted provided that the following conditions are met:

  *

  *   1. Redistributions of source code must retain the above copyright

  *      notice, this list of conditions and the following disclaimer.

  *

  *   2. Redistributions in binary form must reproduce the above copyright

  *      notice, this list of conditions and the following disclaimer in the

  *      documentation and/or other materials provided with the distribution.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

  * POSSIBILITY OF SUCH DAMAGE.

  */

 #include "ascension/context.h"

 #include "ascension/error.h"

 #include "ascension/utils.h"

 #include <SDL2/SDL.h>

 #include <SDL2/SDL_ttf.h>

 #include <time.h>

 AscContext asc_context;

 static uint64_t asc_nanos(void) {

     struct timespec ts;

     clock_gettime(CLOCK_MONOTONIC, &ts);

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

 }

 void asc_context_initialize(void) {

     if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))

         return;

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

     // nothing is active right after initialization

     asc_context.active_window = ASC_MAX_WINDOWS;

     asc_context.active_font = ASC_MAX_FONTS;

     // initialize error buffer

     cxBufferInit(

             &asc_context.error_buffer,

             NULL,

             256,

             NULL,

             CX_BUFFER_AUTO_EXTEND

     );

     // initialize SDL

     if (SDL_Init(SDL_INIT_VIDEO) < 0) {

         asc_error(SDL_GetError());

     } else {

         if (TTF_Init() < 0) {

             asc_error(TTF_GetError());

         }

     }

     SDL_ClearError();

     asc_context.total_nanos = asc_nanos();

     asc_set_flag(asc_context.flags, ASC_FLAG_INITILIZED);

     asc_dprintf("Ascension context initialized.");

 }

 void asc_context_destroy(void) {

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

         asc_window_destroy(i);

     }

     // TODO: fix that fonts are currently leaking by reworking the font cache

     // quit SDL

     if (TTF_WasInit())

         TTF_Quit();

     SDL_Quit();

     // destroy the error buffer

     cxBufferDestroy(&asc_context.error_buffer);

     asc_context.flags = 0;

     asc_dprintf("Ascension context destroyed.");

 }

 void asc_context_quit(void) {

     asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);

 }

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

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

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

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

             asc_context.windows[i].resized = true;

             asc_context.windows[i].dimensions = dimensions;

             return;

         }

     }

 }

 bool asc_loop_next(void) {

     // reset mouse motion

     asc_context.input.mouse_xrel = 0;

     asc_context.input.mouse_yrel = 0;

     // dispatch SDL events

     SDL_Event event;

     while (SDL_PollEvent(&event)) {

         switch (event.type) {

             case SDL_QUIT:

                 asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);

                 break;

             case SDL_WINDOWEVENT: {

                 if (event.window.event == SDL_WINDOWEVENT_RESIZED)

                     asc_event_window_resized(

                             event.window.windowID,

                             event.window.data1,

                             event.window.data2

                     );

                 break;

             }

             case SDL_MOUSEMOTION: {

                 // accumulate relative motion

                 asc_context.input.mouse_xrel += event.motion.xrel;

                 asc_context.input.mouse_yrel += event.motion.yrel;

                 // update absolute position

                 asc_context.input.mouse_x = event.motion.x;

                 asc_context.input.mouse_y = event.motion.y;

                 break;

             }

             case SDL_KEYDOWN:

                 asc_context.input.keys[event.key.keysym.scancode] = true;

                 break;

             case SDL_KEYUP:

                 asc_context.input.keys[event.key.keysym.scancode] = false;

                 break;

         }

     }

     // sync the windows

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

         asc_window_sync(i);

     }

     // compute frame time

     uint64_t frame_nanos, ns;

     do {

         ns = asc_nanos();

         frame_nanos = ns - asc_context.total_nanos;

     } while (frame_nanos == 0);

     asc_context.frame_nanos = frame_nanos;

     asc_context.total_nanos = ns;

     return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT);

 }