Fri, 29 Mar 2024 00:03:25 +0100
make the timer have nanoseconds precision
universe@0 | 1 | /* |
universe@0 | 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
universe@0 | 3 | * Copyright 2023 Mike Becker. All rights reserved. |
universe@0 | 4 | * |
universe@0 | 5 | * Redistribution and use in source and binary forms, with or without |
universe@0 | 6 | * modification, are permitted provided that the following conditions are met: |
universe@0 | 7 | * |
universe@0 | 8 | * 1. Redistributions of source code must retain the above copyright |
universe@0 | 9 | * notice, this list of conditions and the following disclaimer. |
universe@0 | 10 | * |
universe@0 | 11 | * 2. Redistributions in binary form must reproduce the above copyright |
universe@0 | 12 | * notice, this list of conditions and the following disclaimer in the |
universe@0 | 13 | * documentation and/or other materials provided with the distribution. |
universe@0 | 14 | * |
universe@0 | 15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
universe@0 | 16 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
universe@0 | 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
universe@0 | 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
universe@0 | 19 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
universe@0 | 20 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
universe@0 | 21 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
universe@0 | 22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
universe@0 | 23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
universe@0 | 24 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
universe@0 | 25 | * POSSIBILITY OF SUCH DAMAGE. |
universe@0 | 26 | */ |
universe@0 | 27 | |
universe@7 | 28 | #include "ascension/context.h" |
universe@7 | 29 | #include "ascension/error.h" |
universe@7 | 30 | #include "ascension/utils.h" |
universe@15 | 31 | #include "ascension/shader.h" |
universe@0 | 32 | |
universe@6 | 33 | #include <SDL2/SDL.h> |
universe@6 | 34 | #include <SDL2/SDL_ttf.h> |
universe@0 | 35 | |
universe@46 | 36 | #include <time.h> |
universe@46 | 37 | |
universe@0 | 38 | AscContext asc_context; |
universe@0 | 39 | |
universe@46 | 40 | static uint64_t asc_nanos(void) { |
universe@46 | 41 | struct timespec ts; |
universe@46 | 42 | clock_gettime(CLOCK_MONOTONIC, &ts); |
universe@46 | 43 | return 1000000000ull*(uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec; |
universe@46 | 44 | } |
universe@46 | 45 | |
universe@0 | 46 | void asc_context_initialize(void) { |
universe@0 | 47 | if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED)) |
universe@0 | 48 | return; |
universe@11 | 49 | memset(&asc_context, 0, sizeof(AscContext)); |
universe@0 | 50 | |
universe@0 | 51 | // initialize error buffer |
universe@0 | 52 | cxBufferInit( |
universe@0 | 53 | &asc_context.error_buffer, |
universe@0 | 54 | NULL, |
universe@0 | 55 | 256, |
universe@0 | 56 | NULL, |
universe@0 | 57 | CX_BUFFER_AUTO_EXTEND |
universe@0 | 58 | ); |
universe@0 | 59 | |
universe@0 | 60 | // initialize SDL |
universe@0 | 61 | if (SDL_Init(SDL_INIT_VIDEO) < 0) { |
universe@0 | 62 | asc_error(SDL_GetError()); |
universe@0 | 63 | } else { |
universe@0 | 64 | if (TTF_Init() < 0) { |
universe@0 | 65 | asc_error(TTF_GetError()); |
universe@0 | 66 | } |
universe@0 | 67 | } |
universe@0 | 68 | SDL_ClearError(); |
universe@46 | 69 | asc_context.total_nanos = asc_nanos(); |
universe@0 | 70 | asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED); |
universe@0 | 71 | asc_dprintf("Ascension context initialized."); |
universe@0 | 72 | } |
universe@0 | 73 | |
universe@0 | 74 | void asc_context_destroy(void) { |
universe@7 | 75 | for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) { |
universe@7 | 76 | asc_window_destroy(&asc_context.windows[i]); |
universe@7 | 77 | } |
universe@11 | 78 | asc_font_cache_clear(); |
universe@0 | 79 | |
universe@0 | 80 | // quit SDL |
universe@0 | 81 | if (TTF_WasInit()) |
universe@0 | 82 | TTF_Quit(); |
universe@0 | 83 | SDL_Quit(); |
universe@0 | 84 | |
universe@0 | 85 | // destroy the error buffer |
universe@0 | 86 | cxBufferDestroy(&asc_context.error_buffer); |
universe@0 | 87 | asc_context.flags = 0; |
universe@0 | 88 | asc_dprintf("Ascension context destroyed."); |
universe@0 | 89 | } |
universe@16 | 90 | |
universe@16 | 91 | static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) { |
universe@16 | 92 | for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) { |
universe@16 | 93 | if (asc_context.windows[i].id == id) { |
universe@37 | 94 | asc_vec2i dimensions = (asc_vec2i) {width, height}; |
universe@37 | 95 | asc_context.windows[i].resized = true; |
universe@37 | 96 | asc_context.windows[i].dimensions = dimensions; |
universe@37 | 97 | asc_context.windows[i].ui.viewport.size = dimensions; |
universe@37 | 98 | asc_context.windows[i].ui.cameras[0].rect.size = dimensions; |
universe@16 | 99 | return; |
universe@16 | 100 | } |
universe@16 | 101 | } |
universe@16 | 102 | } |
universe@16 | 103 | |
universe@16 | 104 | bool asc_loop_next(void) { |
universe@16 | 105 | // dispatch SDL events |
universe@16 | 106 | SDL_Event event; |
universe@16 | 107 | while (SDL_PollEvent(&event)) { |
universe@16 | 108 | switch (event.type) { |
universe@16 | 109 | case SDL_QUIT: |
universe@16 | 110 | asc_set_flag(&asc_context.flags, ASC_FLAG_QUIT); |
universe@16 | 111 | break; |
universe@16 | 112 | case SDL_WINDOWEVENT: { |
universe@16 | 113 | if (event.window.event == SDL_WINDOWEVENT_RESIZED) |
universe@16 | 114 | asc_event_window_resized( |
universe@16 | 115 | event.window.windowID, |
universe@16 | 116 | event.window.data1, |
universe@16 | 117 | event.window.data2 |
universe@16 | 118 | ); |
universe@16 | 119 | break; |
universe@16 | 120 | } |
universe@16 | 121 | case SDL_KEYDOWN: |
universe@16 | 122 | // TODO: remove this code and implement key press map instead |
universe@16 | 123 | if (event.key.keysym.sym == SDLK_ESCAPE) |
universe@16 | 124 | return false; |
universe@16 | 125 | break; |
universe@16 | 126 | case SDL_KEYUP: |
universe@16 | 127 | // TODO: implement key press map |
universe@16 | 128 | break; |
universe@16 | 129 | } |
universe@16 | 130 | } |
universe@16 | 131 | |
universe@16 | 132 | // sync the windows |
universe@16 | 133 | for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) { |
universe@16 | 134 | if (asc_context.windows[i].id > 0) { |
universe@16 | 135 | asc_window_sync(&asc_context.windows[i]); |
universe@16 | 136 | } |
universe@16 | 137 | } |
universe@16 | 138 | |
universe@16 | 139 | // compute frame time |
universe@46 | 140 | uint64_t frame_nanos, ns; |
universe@46 | 141 | do { |
universe@46 | 142 | ns = asc_nanos(); |
universe@46 | 143 | frame_nanos = ns - asc_context.total_nanos; |
universe@46 | 144 | } while (frame_nanos == 0); |
universe@46 | 145 | asc_context.frame_nanos = frame_nanos; |
universe@46 | 146 | asc_context.total_nanos = ns; |
universe@16 | 147 | |
universe@16 | 148 | return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT); |
universe@16 | 149 | } |