Mercurial > molko
annotate libcore/core/texture.h @ 186:f37b8e95aaaa
core: add blend routines in texture
author | David Demelier <markand@malikania.fr> |
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date | Fri, 06 Nov 2020 11:30:29 +0100 |
parents | c92957c3b82b |
children | 633a25df450e |
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 |
17 | 19 #ifndef MOLKO_TEXTURE_H |
20 #define MOLKO_TEXTURE_H | |
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 #include "plat.h" |
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33 |
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34 /** |
21 | 35 * \brief Texture object. |
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 }; |
21 | 42 |
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 }; |
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52 |
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53 /** |
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54 * Create a new texture. |
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55 * |
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56 * \pre tex != NULL |
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57 * \param tex the texture to initialize |
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58 * \param w the width |
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59 * \param h the height |
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60 * \return False on error. |
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61 */ |
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62 bool |
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63 texture_new(struct texture *tex, unsigned int w, unsigned int h) PLAT_NODISCARD; |
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64 |
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65 /** |
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66 * Check if the texture is valid. |
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67 * |
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68 * This function simply checks if the texture is initialized and has non-null |
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69 * dimensions. |
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70 * |
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71 * \param tex the texture to check (may be NULL) |
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72 * \return True if the texture is properly initialized. |
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73 */ |
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74 bool |
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75 texture_ok(const struct texture *tex); |
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76 |
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77 /** |
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78 * Set blend mode. |
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79 * |
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80 * \pre texture_ok(tex) |
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81 * \param tex the texture |
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82 * \param blend the blend mode |
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83 * \return False on errors. |
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84 */ |
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85 bool |
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86 texture_set_blend_mode(struct texture *tex, enum texture_blend blend); |
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87 |
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88 /** |
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89 * Apply an alpha modulation (aka transparency). |
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90 * |
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91 * You may need to use texture_set_blend_mode before this function to work. |
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92 * |
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93 * \pre texture_ok(tex) |
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94 * \param tex the texture |
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95 * \param alpha the alpha (0-255) |
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96 * \return False on errors. |
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97 */ |
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98 bool |
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99 texture_set_alpha_mod(struct texture *tex, unsigned int alpha); |
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100 |
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101 /** |
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102 * Apply a color modulation (for every pixel). |
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103 * |
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104 * \pre texture_ok(tex) |
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105 * \param tex the texture to modify |
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106 * \param color the color |
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107 * \return False on errors. |
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108 */ |
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109 bool |
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110 texture_set_color_mod(struct texture *tex, unsigned long color); |
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111 |
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112 /** |
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113 * Simple texture drawing. |
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114 * |
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115 * \pre tex != NULL |
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116 * \param tex the texture |
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117 * \param x the X coordinate |
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118 * \param y the Y coordinate |
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119 * \return False in case of rendering error. |
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120 */ |
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121 bool |
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122 texture_draw(const struct texture *tex, int x, int y); |
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123 |
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124 /** |
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125 * Advanced texture drawing. |
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126 * |
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127 * \pre tex != NULL |
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128 * \param tex the texture |
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129 * \param src_x the source rectangle X coordinate |
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130 * \param src_y the source rectangle Y coordinate |
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131 * \param src_w the source rectangle width |
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132 * \param src_h the source rectangle height |
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133 * \param dst_x the destination rectangle X coordinate |
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134 * \param dst_y the destination rectangle Y coordinate |
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135 * \param dst_w the destination rectangle width |
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136 * \param dst_h the destination rectangle height |
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137 * \param angle the angle |
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138 * \return False in case of rendering error. |
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139 */ |
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140 bool |
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141 texture_scale(const struct texture *tex, |
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142 int src_x, |
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143 int src_y, |
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144 unsigned src_w, |
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145 unsigned src_h, |
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146 int dst_x, |
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147 int dst_y, |
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148 unsigned dst_w, |
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149 unsigned dst_h, |
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150 double angle); |
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151 |
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152 /** |
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153 * Close the texture, do not use afterwards. |
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154 * |
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155 * \pre tex != NULL |
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156 * \param tex the texture |
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157 */ |
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158 void |
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159 texture_finish(struct texture *tex); |
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161 #endif /* !MOLKO_TEXTURE_H */ |