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annotate examples/example-drawable.c @ 186:f37b8e95aaaa

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core: add blend routines in texture
author David Demelier <markand@malikania.fr>
date Fri, 06 Nov 2020 11:30:29 +0100
parents f6497ec74b49
children 02285657294c
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1 /*
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2 * example-drawable.c -- example on how to use automatic drawables
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
136
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19 #include <stdlib.h>
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20
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21 #include <core/alloc.h>
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22 #include <core/animation.h>
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23 #include <core/clock.h>
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24 #include <core/core.h>
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25 #include <core/event.h>
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26 #include <core/drawable.h>
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27 #include <core/key.h>
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28 #include <core/painter.h>
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29 #include <core/panic.h>
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30 #include <core/sys.h>
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31 #include <core/image.h>
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32 #include <core/sprite.h>
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33 #include <core/texture.h>
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34 #include <core/util.h>
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35 #include <core/window.h>
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36
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37 #include <ui/label.h>
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38 #include <ui/theme.h>
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39 #include <ui/ui.h>
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40
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41 #include <assets/sprites/explosion.h>
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42
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43 #define W 1280
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44 #define H 720
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45
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46 static struct label help = {
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47 .x = 10,
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48 .y = 10,
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49 .text = "Keys: <Esc> to reset. Click anywhere to spawn a drawable.",
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50 .flags = LABEL_FLAGS_SHADOW
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51 };
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52
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53 static struct drawable_stack stack;
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54
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55 /*
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56 * List of drawables for this example.
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57 * -----------------------------------------------------------------------------
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58 */
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59
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60 /* 0: Explosion animation. */
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61 static struct texture explosion_tex;
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62 static struct sprite explosion_sprite;
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63
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64 struct explosion {
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65 struct animation anim;
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66 struct drawable dw;
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67 };
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68
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69 static void
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70 init(void)
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71 {
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72 if (!core_init() || !ui_init())
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73 panic();
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74 if (!window_open("Example - Drawable", W, H))
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75 panic();
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76
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77 /* 0: Explosion animation. */
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78 if (!image_openmem(&explosion_tex, sprites_explosion, sizeof (sprites_explosion)))
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79 panic();
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80
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81 sprite_init(&explosion_sprite, &explosion_tex, 256, 256);
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82 }
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83
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84 static void
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85 explosion_finish(struct drawable *dw)
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86 {
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87 free(dw->data);
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88 }
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89
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90 static void
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91 spawn(int x, int y)
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92 {
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93 struct explosion *expl = alloc(1, sizeof (struct explosion));
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94
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95 animation_init(&expl->anim, &explosion_sprite, 100);
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96 animation_drawable(&expl->anim, &expl->dw, x, y);
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97
136
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98 /*
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99 * This work because the drawable->data field expects a struct animation
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100 * pointer which is the first member of struct explosion.
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101 *
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102 * Thus this "poor man inheritance" trick works perfectly in our case
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103 * and we simply need to free the whole explosion struct afterwards.
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104 */
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105 expl->dw.finish = explosion_finish;
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106
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107 drawable_stack_add(&stack, &expl->dw);
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108 }
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109
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110 static void
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111 run(void)
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112 {
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113 struct clock clock = {0};
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114
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115 clock_start(&clock);
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116
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117 for (;;) {
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118 union event ev;
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119 unsigned int elapsed = clock_elapsed(&clock);
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120
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121 clock_start(&clock);
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122
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123 while (event_poll(&ev)) {
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124 switch (ev.type) {
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125 case EVENT_KEYDOWN:
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126 switch (ev.key.key) {
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127 case KEY_ESCAPE:
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128 drawable_stack_finish(&stack);
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129 break;
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130 default:
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131 break;
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132 }
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133 break;
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134 case EVENT_CLICKDOWN:
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135 spawn(ev.click.x, ev.click.y);
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136 break;
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137 case EVENT_QUIT:
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138 return;
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139 default:
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140 break;
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141 }
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142 }
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143
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144 drawable_stack_update(&stack, elapsed);
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145 painter_set_color(0xebede9ff);
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146 painter_clear();
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147 label_draw(&help);
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148 drawable_stack_draw(&stack);
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149 painter_present();
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150
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151 if ((elapsed = clock_elapsed(&clock)) < 20)
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152 delay(20 - elapsed);
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153 }
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154 }
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155
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156 static void
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157 quit(void)
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158 {
156
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159 window_finish();
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160 ui_finish();
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161 core_finish();
129
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162 }
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163
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164 int
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165 main(int argc, char **argv)
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166 {
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167 (void)argc;
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168 (void)argv;
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169
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170 init();
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171 run();
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172 quit();
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173 }