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annotate libmlk-core/core/texture.c @ 290:9948e288925b

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rpg: add support for items in battle
author David Demelier <markand@malikania.fr>
date Fri, 08 Jan 2021 12:56:10 +0100
parents 71b3b7036de7
children 196264679079
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1 /*
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2 * texture.c -- 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 #include <assert.h>
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20
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21 #include "color.h"
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22 #include "error.h"
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23 #include "texture.h"
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24 #include "texture_p.h"
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25 #include "util.h"
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26 #include "window.h"
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27 #include "window_p.h"
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29 bool
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30 texture_new(struct texture *tex, unsigned int w, unsigned int h)
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31 {
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32 assert(tex);
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33
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34 tex->handle = SDL_CreateTexture(RENDERER(),
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35 SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, w, h);
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37 if (!tex->handle) {
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38 tex->w = tex->h = 0;
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39 return errorf("%s", SDL_GetError());
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40 }
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42 tex->w = w;
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43 tex->h = h;
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44
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45 return true;
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46 }
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47
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48 bool
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49 texture_ok(const struct texture *tex)
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50 {
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51 return tex && tex->handle && tex->w && tex->h;
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52 }
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54 bool
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55 texture_set_blend_mode(struct texture *tex, enum texture_blend blend)
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56 {
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57 assert(tex);
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58 assert(blend >= TEXTURE_BLEND_NONE && blend <= TEXTURE_BLEND_MODULATE);
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59
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60 static const SDL_BlendMode table[] = {
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61 [TEXTURE_BLEND_NONE] = SDL_BLENDMODE_NONE,
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62 [TEXTURE_BLEND_BLEND] = SDL_BLENDMODE_BLEND,
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63 [TEXTURE_BLEND_ADD] = SDL_BLENDMODE_ADD,
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64 [TEXTURE_BLEND_MODULATE] = SDL_BLENDMODE_MOD
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65 };
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67 if (SDL_SetTextureBlendMode(tex->handle, table[blend]) < 0)
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68 return errorf("%s", SDL_GetError());
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70 return true;
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71 }
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72
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73 bool
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74 texture_set_alpha_mod(struct texture *tex, unsigned int alpha)
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75 {
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76 assert(texture_ok(tex));
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77 assert(alpha <= 255);
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78
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79 if (SDL_SetTextureAlphaMod(tex->handle, alpha) < 0)
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80 return errorf("%s", SDL_GetError());
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81
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82 return true;
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83 }
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84
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85 bool
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86 texture_set_color_mod(struct texture *tex, unsigned long color)
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87 {
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88 assert(texture_ok(tex));
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89
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90 if (SDL_SetTextureColorMod(tex->handle, COLOR_R(color), COLOR_G(color), COLOR_B(color)) < 0)
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91 return errorf("%s", SDL_GetError());
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92
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93 return true;
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94 }
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95
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96 bool
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97 texture_draw(const struct texture *tex, int x, int y)
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98 {
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99 assert(tex);
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100
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101 SDL_Rect dst = {
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102 .x = x,
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103 .y = y,
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104 .w = tex->w,
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105 .h = tex->h
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106 };
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107
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108 if (SDL_RenderCopy(RENDERER(), tex->handle, NULL, &dst) < 0)
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109 return errorf("%s", SDL_GetError());
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110
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111 return true;
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112 }
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113
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114 bool
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115 texture_scale(const struct texture *tex,
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116 int src_x,
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117 int src_y,
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118 unsigned src_w,
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119 unsigned src_h,
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120 int dst_x,
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121 int dst_y,
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122 unsigned dst_w,
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123 unsigned dst_h,
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124 double angle)
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125 {
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126 const SDL_Rect src = {
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127 .x = src_x,
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128 .y = src_y,
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129 .w = src_w,
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130 .h = src_h
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131 };
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132 const SDL_Rect dst = {
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133 .x = dst_x,
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134 .y = dst_y,
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135 .w = dst_w,
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136 .h = dst_h
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137 };
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138
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139 if (SDL_RenderCopyEx(RENDERER(), tex->handle, &src, &dst, angle, NULL, SDL_FLIP_NONE) < 0)
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140 return errorf("%s", SDL_GetError());
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141
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142 return true;
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143 }
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144
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145 void
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146 texture_finish(struct texture *tex)
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147 {
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148 assert(tex);
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149
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150 if (tex->handle)
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151 SDL_DestroyTexture(tex->handle);
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152
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153 memset(tex, 0, sizeof (*tex));
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154 }
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155
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156 /* private */
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157
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158 bool
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159 texture_from_surface(struct texture *tex, SDL_Surface *surface)
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160 {
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161 assert(tex);
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162 assert(surface);
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163
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164 if (!(tex->handle = SDL_CreateTextureFromSurface(RENDERER(), surface))) {
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165 tex->w = tex->h = 0;
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166 return errorf("%s", SDL_GetError());
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167 }
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168
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169 tex->w = surface->w;
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170 tex->h = surface->h;
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171
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172 SDL_FreeSurface(surface);
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173
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174 return true;
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175 }