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annotate libmlk-core/core/texture.h @ 243:71b3b7036de7

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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>
date Sat, 28 Nov 2020 22:37:30 +0100
parents libcore/core/texture.h@dd7c8d4321a3
children c4da052c0def
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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
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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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30 #include <stdbool.h>
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32 /**
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33 * \brief Texture object.
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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 };
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40
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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);
3
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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);
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159
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160 #endif /* !MOLKO_CORE_TEXTURE_H */