src/context.c

Thu, 15 Aug 2024 17:33:42 +0200

author
Mike Becker <universe@uap-core.de>
date
Thu, 15 Aug 2024 17:33:42 +0200
changeset 72
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parent 68
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permissions
-rw-r--r--

define macro for predefined shader

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 * Copyright 2023 Mike Becker. All rights reserved.
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4 *
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions are met:
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7 *
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8 * 1. Redistributions of source code must retain the above copyright
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9 * notice, this list of conditions and the following disclaimer.
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10 *
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 #include "ascension/context.h"
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29 #include "ascension/error.h"
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30 #include "ascension/utils.h"
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31
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32 #include <SDL2/SDL.h>
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33 #include <SDL2/SDL_ttf.h>
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34
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35 #include <time.h>
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36
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37 AscContext asc_context;
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38
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39 static uint64_t asc_nanos(void) {
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40 struct timespec ts;
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41 clock_gettime(CLOCK_MONOTONIC, &ts);
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42 return 1000000000ull*(uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec;
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43 }
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44
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45 // forward declare non-public font cache functions
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46 void asc_font_cache_init(void);
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47 void asc_font_cache_destroy(void);
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48
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49 void asc_context_initialize(void) {
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50 if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))
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51 return;
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52 memset(&asc_context, 0, sizeof(AscContext));
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53
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54 // initialize the font cache
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55 asc_font_cache_init();
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56
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57 // set a default font, but do not load it
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58 asc_context.active_font.style = ASC_FONT_REGULAR;
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59 asc_context.active_font.size = 14;
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60
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61 // no window, yet
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62 asc_context.active_window = ASC_MAX_WINDOWS;
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63
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64 // initialize error buffer
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65 cxBufferInit(
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66 &asc_context.error_buffer,
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67 NULL,
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68 256,
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69 NULL,
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70 CX_BUFFER_AUTO_EXTEND
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71 );
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72
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73 // initialize SDL
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74 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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75 asc_error(SDL_GetError());
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76 } else {
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77 if (TTF_Init() < 0) {
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78 asc_error(TTF_GetError());
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79 }
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80 }
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81 SDL_ClearError();
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82 asc_context.total_nanos = asc_nanos();
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83 asc_set_flag(asc_context.flags, ASC_FLAG_INITILIZED);
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84 asc_dprintf("Ascension context initialized.");
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85 }
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86
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87 void asc_context_destroy(void) {
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88 // destroy windows
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89 for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
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90 asc_window_destroy(i);
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91 }
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92
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93 // destroy the font cache
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94 asc_font_cache_destroy();
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95
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96 // quit SDL
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97 if (TTF_WasInit())
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98 TTF_Quit();
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99 SDL_Quit();
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100
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101 // destroy the error buffer
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102 cxBufferDestroy(&asc_context.error_buffer);
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103 asc_context.flags = 0;
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104 asc_dprintf("Ascension context destroyed.");
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105 }
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106
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107 void asc_context_quit(void) {
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108 asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);
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109 }
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110
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111 AscWindow *asc_active_window_assert() {
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112 if (asc_context.active_window < ASC_MAX_WINDOWS) {
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113 return &asc_context.windows[asc_context.active_window];
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114 } else {
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115 asc_dprintf("Window access attempted without active window");
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116 abort();
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117 }
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118 }
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119
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120 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {
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121 unsigned int i = asc_window_index(id);
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122 if (i < ASC_MAX_WINDOWS) {
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123 asc_vec2i dimensions = (asc_vec2i) {width, height};
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124 asc_context.windows[i].resized = true;
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125 asc_context.windows[i].dimensions = dimensions;
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126 }
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127 }
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128
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129 bool asc_loop_next(void) {
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130 // reset mouse motion
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131 asc_context.input.mouse_xrel = 0;
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132 asc_context.input.mouse_yrel = 0;
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133
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134 // dispatch SDL events
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135 SDL_Event event;
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136 while (SDL_PollEvent(&event)) {
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137 switch (event.type) {
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138 case SDL_QUIT:
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139 asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);
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140 break;
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141 case SDL_WINDOWEVENT: {
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142 if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
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143 asc_event_window_resized(
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144 event.window.windowID,
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145 event.window.data1,
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146 event.window.data2
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147 );
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148 } else if (event.window.event == SDL_WINDOWEVENT_FOCUS_GAINED) {
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149 unsigned int idx = asc_window_index(event.window.windowID);
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150 asc_context.windows[idx].focused = true;
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151 } else if (event.window.event == SDL_WINDOWEVENT_FOCUS_LOST) {
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152 unsigned int idx = asc_window_index(event.window.windowID);
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153 asc_context.windows[idx].focused = false;
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154 }
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155 break;
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156 }
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157 case SDL_MOUSEMOTION: {
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158 // accumulate relative motion
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159 asc_context.input.mouse_xrel += event.motion.xrel;
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160 asc_context.input.mouse_yrel += event.motion.yrel;
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161 // update absolute position
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162 asc_context.input.mouse_x = event.motion.x;
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163 asc_context.input.mouse_y = event.motion.y;
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164 // update which window the mouse was seen in
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165 asc_context.input.mouse_window =
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166 asc_window_index(event.motion.windowID);
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167 break;
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168 }
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169 case SDL_KEYDOWN:
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170 asc_context.input.keys[event.key.keysym.scancode] = true;
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171 break;
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172 case SDL_KEYUP:
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173 asc_context.input.keys[event.key.keysym.scancode] = false;
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174 break;
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175 }
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176 }
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177
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178 // sync the windows
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179 for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
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180 asc_window_sync(i);
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181 }
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182
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183 // compute frame time
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184 uint64_t frame_nanos, ns;
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185 do {
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186 ns = asc_nanos();
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187 frame_nanos = ns - asc_context.total_nanos;
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188 } while (frame_nanos == 0);
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189 asc_context.frame_nanos = frame_nanos;
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190 asc_context.total_nanos = ns;
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191
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192 return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT);
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193 }

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