Mercurial > molko
annotate libmlk-core/core/texture.h @ 243:71b3b7036de7
misc: lot of cleanups,
- prefix libraries with libmlk,
- move assets from source directories closes #2520,
- prefix header guards closes #2519
author | David Demelier <markand@malikania.fr> |
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date | Sat, 28 Nov 2020 22:37:30 +0100 |
parents | libcore/core/texture.h@dd7c8d4321a3 |
children | c4da052c0def |
rev | line source |
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1 /* |
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2 * texture.h -- basic texture management |
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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 |
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19 #ifndef MOLKO_CORE_TEXTURE_H |
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20 #define MOLKO_CORE_TEXTURE_H |
17 | 21 |
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22 /** |
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23 * \file texture.h |
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24 * \brief Basic texture management. |
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25 * \ingroup drawing |
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26 * |
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27 * See also \a image.h for usage of textures. |
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28 */ |
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29 |
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30 #include <stdbool.h> |
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31 |
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32 /** |
21 | 33 * \brief Texture object. |
34 */ | |
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35 struct texture { |
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36 unsigned int w; /*!< (-) Texture width. */ |
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37 unsigned int h; /*!< (-) Texture height. */ |
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38 void *handle; /*!< (*) Native handle. */ |
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39 }; |
21 | 40 |
41 /** | |
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42 * \brief Blend type when rendering. |
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43 */ |
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44 enum texture_blend { |
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45 TEXTURE_BLEND_NONE, /*!< No pixel modulation. */ |
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46 TEXTURE_BLEND_BLEND, /*!< Blend transparency. */ |
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47 TEXTURE_BLEND_ADD, /*!< Additive blending. */ |
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48 TEXTURE_BLEND_MODULATE, /*!< Color modulation. */ |
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49 TEXTURE_BLEND_LAST /*!< Unused. */ |
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50 }; |
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51 |
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52 /** |
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53 * Create a new texture. |
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54 * |
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55 * \pre tex != NULL |
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56 * \param tex the texture to initialize |
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57 * \param w the width |
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58 * \param h the height |
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59 * \return False on error. |
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60 */ |
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61 bool |
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62 texture_new(struct texture *tex, unsigned int w, unsigned int h); |
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63 |
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64 /** |
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65 * Check if the texture is valid. |
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66 * |
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67 * This function simply checks if the texture is initialized and has non-null |
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68 * dimensions. |
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69 * |
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70 * \param tex the texture to check (may be NULL) |
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71 * \return True if the texture is properly initialized. |
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72 */ |
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73 bool |
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74 texture_ok(const struct texture *tex); |
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75 |
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76 /** |
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77 * Set blend mode. |
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78 * |
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79 * \pre texture_ok(tex) |
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80 * \param tex the texture |
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81 * \param blend the blend mode |
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82 * \return False on errors. |
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83 */ |
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84 bool |
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85 texture_set_blend_mode(struct texture *tex, enum texture_blend blend); |
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86 |
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87 /** |
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88 * Apply an alpha modulation (aka transparency). |
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89 * |
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90 * You may need to use texture_set_blend_mode before this function to work. |
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91 * |
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92 * \pre texture_ok(tex) |
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93 * \param tex the texture |
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94 * \param alpha the alpha (0-255) |
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95 * \return False on errors. |
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96 */ |
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97 bool |
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98 texture_set_alpha_mod(struct texture *tex, unsigned int alpha); |
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99 |
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100 /** |
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101 * Apply a color modulation (for every pixel). |
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102 * |
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103 * \pre texture_ok(tex) |
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104 * \param tex the texture to modify |
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105 * \param color the color |
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106 * \return False on errors. |
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107 */ |
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108 bool |
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109 texture_set_color_mod(struct texture *tex, unsigned long color); |
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110 |
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111 /** |
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112 * Simple texture drawing. |
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113 * |
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114 * \pre tex != NULL |
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115 * \param tex the texture |
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116 * \param x the X coordinate |
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117 * \param y the Y coordinate |
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118 * \return False in case of rendering error. |
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119 */ |
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120 bool |
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121 texture_draw(const struct texture *tex, int x, int y); |
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122 |
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123 /** |
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124 * Advanced texture drawing. |
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125 * |
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126 * \pre tex != NULL |
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127 * \param tex the texture |
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128 * \param src_x the source rectangle X coordinate |
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129 * \param src_y the source rectangle Y coordinate |
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130 * \param src_w the source rectangle width |
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131 * \param src_h the source rectangle height |
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132 * \param dst_x the destination rectangle X coordinate |
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133 * \param dst_y the destination rectangle Y coordinate |
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134 * \param dst_w the destination rectangle width |
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135 * \param dst_h the destination rectangle height |
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136 * \param angle the angle |
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137 * \return False in case of rendering error. |
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138 */ |
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139 bool |
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140 texture_scale(const struct texture *tex, |
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141 int src_x, |
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142 int src_y, |
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143 unsigned src_w, |
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144 unsigned src_h, |
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145 int dst_x, |
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146 int dst_y, |
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147 unsigned dst_w, |
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148 unsigned dst_h, |
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149 double angle); |
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150 |
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151 /** |
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152 * Close the texture, do not use afterwards. |
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153 * |
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154 * \pre tex != NULL |
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155 * \param tex the texture |
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156 */ |
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157 void |
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158 texture_finish(struct texture *tex); |
17 | 159 |
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160 #endif /* !MOLKO_CORE_TEXTURE_H */ |