Mercurial > molko
annotate libmlk-core/mlk/core/painter.c @ 545:27303e9402de
core: introduce mlk_alloc_expand
author | David Demelier <markand@malikania.fr> |
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date | Sun, 05 Mar 2023 22:14:02 +0100 |
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children | d307f93d79af |
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1 /* |
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2 * painter.c -- basic drawing routines |
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3 * |
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4 * Copyright (c) 2020-2023 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 |
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19 #include <math.h> |
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20 |
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21 #include "color.h" |
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22 #include "painter.h" |
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23 #include "texture.h" |
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24 #include "window.h" |
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25 #include "window_p.h" |
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26 |
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27 /* Current texture renderer. */ |
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28 static struct mlk_texture *renderer; |
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29 |
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30 struct mlk_texture * |
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31 mlk_painter_get_target(void) |
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32 { |
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33 return renderer; |
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34 } |
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35 |
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36 void |
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37 mlk_painter_set_target(struct mlk_texture *tex) |
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38 { |
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39 renderer = tex; |
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40 SDL_SetRenderTarget(MLK__RENDERER(), tex ? tex->handle : NULL); |
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41 } |
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42 |
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43 unsigned long |
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44 mlk_painter_get_color(void) |
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45 { |
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46 Uint8 r = 0, g = 0, b = 0, a = 0; |
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47 |
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48 SDL_GetRenderDrawColor(MLK__RENDERER(), &r, &g, &b, &a); |
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49 |
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50 return MLK_COLOR_HEX(r, g, b, a); |
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51 } |
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52 |
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53 void |
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54 mlk_painter_set_color(unsigned long color) |
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55 { |
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56 SDL_SetRenderDrawColor( |
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57 MLK__RENDERER(), |
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58 MLK_COLOR_R(color), |
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59 MLK_COLOR_G(color), |
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60 MLK_COLOR_B(color), |
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61 MLK_COLOR_A(color) |
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62 ); |
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63 } |
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64 |
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65 void |
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66 mlk_painter_draw_line(int x1, int y1, int x2, int y2) |
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67 { |
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68 SDL_RenderDrawLine(MLK__RENDERER(), x1, y1, x2, y2); |
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69 } |
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70 |
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71 void |
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72 mlk_painter_draw_point(int x1, int y1) |
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73 { |
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74 SDL_RenderDrawPoint(MLK__RENDERER(), x1, y1); |
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75 } |
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76 |
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77 void |
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78 mlk_painter_draw_rectangle(int x, int y, unsigned int width, unsigned int height) |
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79 { |
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80 const SDL_Rect rect = { |
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81 .w = width, |
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82 .h = height, |
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83 .x = x, |
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84 .y = y |
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85 }; |
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86 |
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87 SDL_RenderFillRect(MLK__RENDERER(), &rect); |
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88 } |
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89 |
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90 void |
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91 mlk_painter_draw_circle(int x, int y, int radius) |
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92 { |
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93 // Note that there is more to altering the bitrate of this |
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94 // method than just changing this value. See how pixels are |
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95 // altered at the following web page for tips: |
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96 // http://www.libsdl.org/intro.en/usingvideo.html |
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97 for (double dy = 1; dy <= radius; dy += 1.0) { |
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98 double dx = floor(sqrt((2.0 * radius * dy) - (dy * dy))); |
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99 |
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100 SDL_RenderDrawLine(MLK__RENDERER(), x - dx, y + dy - radius, x + dx, y + dy - radius); |
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101 SDL_RenderDrawLine(MLK__RENDERER(), x - dx, y - dy + radius, x + dx, y - dy + radius); |
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102 } |
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103 } |
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104 |
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105 void |
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106 mlk_painter_clear(void) |
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107 { |
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108 SDL_RenderClear(MLK__RENDERER()); |
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109 } |
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110 |
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111 void |
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112 mlk_painter_present(void) |
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113 { |
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114 SDL_RenderPresent(MLK__RENDERER()); |
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115 } |