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annotate src/video/dummy/SDL_nullrender.c @ 1907:06c27a737b7a

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Streamlined the API a bit and optimized the software renderer.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 15 Jul 2006 09:46:36 +0000
parents 0c49855a7a3e
children e079dafea2bf
rev   line source
1895
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_video.h"
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25 #include "../SDL_sysvideo.h"
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26
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27
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28 /* SDL surface based renderer implementation */
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29
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30 static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
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31 Uint32 flags);
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32 static int SDL_DUMMY_CreateTexture(SDL_Renderer * renderer,
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33 SDL_Texture * texture);
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34 static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
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35 static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
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36
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37
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38 SDL_RenderDriver SDL_DUMMY_RenderDriver = {
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39 SDL_DUMMY_CreateRenderer,
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40 {
1906
0c49855a7a3e Changed the name of the dummy renderer
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41 "dummy",
1907
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42 (SDL_Renderer_PresentDiscard | SDL_Renderer_PresentCopy),
1895
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43 SDL_TextureBlendMode_None,
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44 SDL_TextureScaleMode_None,
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45 0,
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46 {0},
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47 0,
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48 0}
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49 };
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50
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51 typedef struct
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52 {
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53 SDL_Surface *surface;
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54 } SDL_DUMMY_RenderData;
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55
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56 SDL_Renderer *
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57 SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
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58 {
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59 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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60 SDL_DisplayMode *displayMode = &display->current_mode;
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61 SDL_Renderer *renderer;
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62 SDL_DUMMY_RenderData *data;
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63 int bpp;
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64 Uint32 Rmask, Gmask, Bmask, Amask;
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65
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66 if (!SDL_PixelFormatEnumToMasks
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67 (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
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68 SDL_SetError("Unknown display format");
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69 return NULL;
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70 }
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71
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72 renderer = (SDL_Renderer *) SDL_malloc(sizeof(*renderer));
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73 if (!renderer) {
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74 SDL_OutOfMemory();
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75 return NULL;
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76 }
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77 SDL_zerop(renderer);
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78
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79 data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
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80 if (!data) {
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81 SDL_DUMMY_DestroyRenderer(renderer);
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82 SDL_OutOfMemory();
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83 return NULL;
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84 }
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85 SDL_zerop(data);
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86
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87 renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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88 renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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89 renderer->info = SDL_DUMMY_RenderDriver.info;
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90 renderer->window = window->id;
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91 renderer->driverdata = data;
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92
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93 data->surface =
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94 SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
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95 Bmask, Amask);
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96 if (!data->surface) {
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97 SDL_DUMMY_DestroyRenderer(renderer);
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98 return NULL;
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99 }
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100 SDL_SetSurfacePalette(data->surface, display->palette);
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101
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102 return renderer;
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103 }
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104
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105 void
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106 SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
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107 {
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108 static int frame_number;
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109 SDL_DUMMY_RenderData *data =
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110 (SDL_DUMMY_RenderData *) renderer->driverdata;
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111 SDL_Surface *surface = data->surface;
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112
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113 if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
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114 char file[128];
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115 SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
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116 renderer->window, ++frame_number);
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117 SDL_SaveBMP(surface, file);
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118 }
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119 }
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120
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121 void
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122 SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
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123 {
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124 SDL_DUMMY_RenderData *data =
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125 (SDL_DUMMY_RenderData *) renderer->driverdata;
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126
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127 if (data) {
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128 if (data->surface) {
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129 data->surface->format->palette = NULL;
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130 SDL_FreeSurface(data->surface);
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131 }
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132 SDL_free(data);
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133 }
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134 SDL_free(renderer);
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135 }
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136
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137 /* vi: set ts=4 sw=4 expandtab: */