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molko-js: miscellaneous fixes While here, import sphinx as experimental documentation.
author David Demelier <markand@malikania.fr>
date Sat, 07 Nov 2020 15:40:34 +0100
parents f37b8e95aaaa
children dd7c8d4321a3
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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_TEXTURE_H
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20 #define MOLKO_TEXTURE_H
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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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30 #include <stdbool.h>
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31
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32 #include "plat.h"
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33
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34 /**
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35 * \brief Texture object.
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36 */
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37 struct texture {
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38 unsigned int w; /*!< (-) Texture width. */
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39 unsigned int h; /*!< (-) Texture height. */
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40 void *handle; /*!< (*) Native handle. */
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41 };
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42
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43 /**
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44 * \brief Blend type when rendering.
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45 */
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46 enum texture_blend {
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47 TEXTURE_BLEND_NONE, /*!< No pixel modulation. */
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48 TEXTURE_BLEND_BLEND, /*!< Blend transparency. */
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49 TEXTURE_BLEND_ADD, /*!< Additive blending. */
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50 TEXTURE_BLEND_MODULATE, /*!< Color modulation. */
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51 TEXTURE_BLEND_LAST /*!< Unused. */
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52 };
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53
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54 /**
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55 * Create a new texture.
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56 *
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57 * \pre tex != NULL
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58 * \param tex the texture to initialize
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59 * \param w the width
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60 * \param h the height
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61 * \return False on error.
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62 */
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63 bool
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64 texture_new(struct texture *tex, unsigned int w, unsigned int h) PLAT_NODISCARD;
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66 /**
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67 * Check if the texture is valid.
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68 *
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69 * This function simply checks if the texture is initialized and has non-null
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70 * dimensions.
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71 *
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72 * \param tex the texture to check (may be NULL)
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73 * \return True if the texture is properly initialized.
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74 */
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75 bool
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76 texture_ok(const struct texture *tex);
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77
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78 /**
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79 * Set blend mode.
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80 *
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81 * \pre texture_ok(tex)
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82 * \param tex the texture
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83 * \param blend the blend mode
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84 * \return False on errors.
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85 */
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86 bool
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87 texture_set_blend_mode(struct texture *tex, enum texture_blend blend);
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88
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89 /**
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90 * Apply an alpha modulation (aka transparency).
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91 *
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92 * You may need to use texture_set_blend_mode before this function to work.
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93 *
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94 * \pre texture_ok(tex)
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95 * \param tex the texture
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96 * \param alpha the alpha (0-255)
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97 * \return False on errors.
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98 */
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99 bool
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100 texture_set_alpha_mod(struct texture *tex, unsigned int alpha);
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101
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102 /**
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103 * Apply a color modulation (for every pixel).
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104 *
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105 * \pre texture_ok(tex)
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106 * \param tex the texture to modify
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107 * \param color the color
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108 * \return False on errors.
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109 */
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110 bool
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111 texture_set_color_mod(struct texture *tex, unsigned long color);
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112
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113 /**
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114 * Simple texture drawing.
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115 *
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116 * \pre tex != NULL
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117 * \param tex the texture
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118 * \param x the X coordinate
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119 * \param y the Y coordinate
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120 * \return False in case of rendering error.
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121 */
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122 bool
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123 texture_draw(const struct texture *tex, int x, int y);
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124
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125 /**
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126 * Advanced texture drawing.
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127 *
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128 * \pre tex != NULL
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129 * \param tex the texture
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130 * \param src_x the source rectangle X coordinate
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131 * \param src_y the source rectangle Y coordinate
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132 * \param src_w the source rectangle width
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133 * \param src_h the source rectangle height
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134 * \param dst_x the destination rectangle X coordinate
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135 * \param dst_y the destination rectangle Y coordinate
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136 * \param dst_w the destination rectangle width
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137 * \param dst_h the destination rectangle height
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138 * \param angle the angle
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139 * \return False in case of rendering error.
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140 */
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141 bool
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142 texture_scale(const struct texture *tex,
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143 int src_x,
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144 int src_y,
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145 unsigned src_w,
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146 unsigned src_h,
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147 int dst_x,
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148 int dst_y,
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149 unsigned dst_w,
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150 unsigned dst_h,
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151 double angle);
3
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152
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153 /**
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154 * Close the texture, do not use afterwards.
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155 *
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156 * \pre tex != NULL
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157 * \param tex the texture
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158 */
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159 void
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160 texture_finish(struct texture *tex);
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161
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162 #endif /* !MOLKO_TEXTURE_H */