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annotate src/video/dummy/SDL_nullrender.c @ 2903:e426c4fc9cf7

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Working Bresenham line drawing algorithm. We can optimize later, if needed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 21 Dec 2008 20:16:21 +0000
parents 133601e3b255
children 2133d2d300fd
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 #include "../SDL_yuv_sw_c.h"
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27 #include "../SDL_renderer_sw.h"
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28
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29
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30 /* SDL surface based renderer implementation */
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31
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32 static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
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33 Uint32 flags);
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34 static int SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer);
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35 static int SDL_DUMMY_SetDrawBlendMode(SDL_Renderer * renderer);
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36 static int SDL_DUMMY_RenderPoint(SDL_Renderer * renderer, int x, int y);
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37 static int SDL_DUMMY_RenderLine(SDL_Renderer * renderer, int x1, int y1,
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38 int x2, int y2);
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39 static int SDL_DUMMY_RenderFill(SDL_Renderer * renderer,
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40 const SDL_Rect * rect);
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41 static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
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42 SDL_Texture * texture,
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43 const SDL_Rect * srcrect,
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44 const SDL_Rect * dstrect);
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45 static void SDL_DUMMY_RenderPresent(SDL_Renderer * renderer);
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46 static void SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer);
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47
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48
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49 SDL_RenderDriver SDL_DUMMY_RenderDriver = {
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50 SDL_DUMMY_CreateRenderer,
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51 {
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52 "dummy",
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53 (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
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54 SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
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55 SDL_RENDERER_PRESENTDISCARD),
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56 }
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57 };
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58
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59 typedef struct
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60 {
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61 int current_screen;
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62 SDL_Surface *screens[3];
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63 } SDL_DUMMY_RenderData;
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64
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65 SDL_Renderer *
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66 SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
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67 {
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68 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
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69 SDL_DisplayMode *displayMode = &display->current_mode;
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70 SDL_Renderer *renderer;
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71 SDL_DUMMY_RenderData *data;
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72 int i, n;
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73 int bpp;
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74 Uint32 Rmask, Gmask, Bmask, Amask;
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75
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76 if (!SDL_PixelFormatEnumToMasks
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77 (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
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78 SDL_SetError("Unknown display format");
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79 return NULL;
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80 }
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81
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82 renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
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83 if (!renderer) {
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84 SDL_OutOfMemory();
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85 return NULL;
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86 }
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87
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88 data = (SDL_DUMMY_RenderData *) SDL_malloc(sizeof(*data));
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89 if (!data) {
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90 SDL_DUMMY_DestroyRenderer(renderer);
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91 SDL_OutOfMemory();
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92 return NULL;
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93 }
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94 SDL_zerop(data);
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95
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96 renderer->SetDrawColor = SDL_DUMMY_SetDrawColor;
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97 renderer->SetDrawBlendMode = SDL_DUMMY_SetDrawBlendMode;
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98 renderer->RenderPoint = SDL_DUMMY_RenderPoint;
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99 renderer->RenderLine = SDL_DUMMY_RenderLine;
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100 renderer->RenderFill = SDL_DUMMY_RenderFill;
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101 renderer->RenderCopy = SDL_DUMMY_RenderCopy;
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102 renderer->RenderPresent = SDL_DUMMY_RenderPresent;
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103 renderer->DestroyRenderer = SDL_DUMMY_DestroyRenderer;
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104 renderer->info.name = SDL_DUMMY_RenderDriver.info.name;
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105 renderer->info.flags = 0;
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106 renderer->window = window->id;
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107 renderer->driverdata = data;
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108 Setup_SoftwareRenderer(renderer);
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109
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110 if (flags & SDL_RENDERER_PRESENTFLIP2) {
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111 renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
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112 n = 2;
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113 } else if (flags & SDL_RENDERER_PRESENTFLIP3) {
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114 renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
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115 n = 3;
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116 } else {
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117 renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
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118 n = 1;
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119 }
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120 for (i = 0; i < n; ++i) {
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121 data->screens[i] =
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122 SDL_CreateRGBSurface(0, window->w, window->h, bpp, Rmask, Gmask,
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123 Bmask, Amask);
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124 if (!data->screens[i]) {
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125 SDL_DUMMY_DestroyRenderer(renderer);
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126 return NULL;
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127 }
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128 SDL_SetSurfacePalette(data->screens[i], display->palette);
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diff changeset
129 }
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diff changeset
130 data->current_screen = 0;
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diff changeset
131
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
132 return renderer;
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parents:
diff changeset
133 }
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parents:
diff changeset
134
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diff changeset
135 static int
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diff changeset
136 SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer)
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diff changeset
137 {
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diff changeset
138 return 0;
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diff changeset
139 }
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diff changeset
140
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diff changeset
141 static int
2888
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diff changeset
142 SDL_DUMMY_SetDrawBlendMode(SDL_Renderer * renderer)
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diff changeset
143 {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
144 return 0;
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents: 2884
diff changeset
145 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents: 2884
diff changeset
146
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents: 2884
diff changeset
147 static int
2901
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diff changeset
148 SDL_DUMMY_RenderPoint(SDL_Renderer * renderer, int x, int y)
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diff changeset
149 {
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diff changeset
150 SDL_DUMMY_RenderData *data =
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diff changeset
151 (SDL_DUMMY_RenderData *) renderer->driverdata;
133601e3b255 Added RenderPiont() API
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diff changeset
152 SDL_Surface *target = data->screens[data->current_screen];
133601e3b255 Added RenderPiont() API
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diff changeset
153 int status;
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parents: 2888
diff changeset
154
133601e3b255 Added RenderPiont() API
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parents: 2888
diff changeset
155 if (renderer->blendMode == SDL_BLENDMODE_NONE ||
133601e3b255 Added RenderPiont() API
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diff changeset
156 renderer->blendMode == SDL_BLENDMODE_MASK) {
133601e3b255 Added RenderPiont() API
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diff changeset
157 Uint32 color =
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diff changeset
158 SDL_MapRGBA(target->format, renderer->r, renderer->g, renderer->b,
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diff changeset
159 renderer->a);
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diff changeset
160
133601e3b255 Added RenderPiont() API
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diff changeset
161 status = SDL_DrawPoint(target, x, y, color);
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diff changeset
162 } else {
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diff changeset
163 status =
133601e3b255 Added RenderPiont() API
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diff changeset
164 SDL_BlendPoint(target, x, y, renderer->blendMode, renderer->r,
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165 renderer->g, renderer->b, renderer->a);
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diff changeset
166 }
133601e3b255 Added RenderPiont() API
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parents: 2888
diff changeset
167 return status;
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diff changeset
168 }
133601e3b255 Added RenderPiont() API
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parents: 2888
diff changeset
169
133601e3b255 Added RenderPiont() API
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parents: 2888
diff changeset
170 static int
2888
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171 SDL_DUMMY_RenderLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2)
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diff changeset
172 {
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diff changeset
173 SDL_DUMMY_RenderData *data =
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diff changeset
174 (SDL_DUMMY_RenderData *) renderer->driverdata;
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diff changeset
175 SDL_Surface *target = data->screens[data->current_screen];
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176 int status;
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diff changeset
177
2901
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178 if (renderer->blendMode == SDL_BLENDMODE_NONE ||
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diff changeset
179 renderer->blendMode == SDL_BLENDMODE_MASK) {
2888
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180 Uint32 color =
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diff changeset
181 SDL_MapRGBA(target->format, renderer->r, renderer->g, renderer->b,
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diff changeset
182 renderer->a);
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diff changeset
183
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diff changeset
184 status = SDL_DrawLine(target, x1, y1, x2, y2, color);
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diff changeset
185 } else {
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diff changeset
186 status =
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diff changeset
187 SDL_BlendLine(target, x1, y1, x2, y2, renderer->blendMode,
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diff changeset
188 renderer->r, renderer->g, renderer->b, renderer->a);
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189 }
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diff changeset
190 return status;
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diff changeset
191 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
192
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
193 static int
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diff changeset
194 SDL_DUMMY_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect)
1908
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diff changeset
195 {
1912
8d384b647307 Setting up the OpenGL support
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diff changeset
196 SDL_DUMMY_RenderData *data =
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diff changeset
197 (SDL_DUMMY_RenderData *) renderer->driverdata;
1908
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diff changeset
198 SDL_Surface *target = data->screens[data->current_screen];
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diff changeset
199 SDL_Rect real_rect = *rect;
2888
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diff changeset
200 int status;
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
201
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents: 2884
diff changeset
202 if (renderer->blendMode == SDL_BLENDMODE_NONE) {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
203 Uint32 color =
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
204 SDL_MapRGBA(target->format, renderer->r, renderer->g, renderer->b,
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diff changeset
205 renderer->a);
1908
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diff changeset
206
2888
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
207 status = SDL_FillRect(target, &real_rect, color);
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
208 } else {
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
209 status =
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
210 SDL_BlendRect(target, &real_rect, renderer->blendMode,
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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parents: 2884
diff changeset
211 renderer->r, renderer->g, renderer->b, renderer->a);
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parents: 2884
diff changeset
212 }
32e8bbba1e94 Added stubs for software implementations of blending fills and line drawing
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diff changeset
213 return status;
1908
e079dafea2bf Implemented fully featured dummy renderer
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diff changeset
214 }
e079dafea2bf Implemented fully featured dummy renderer
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diff changeset
215
e079dafea2bf Implemented fully featured dummy renderer
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diff changeset
216 static int
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
217 SDL_DUMMY_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
1985
8055185ae4ed Added source color and alpha modulation support.
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parents: 1965
diff changeset
218 const SDL_Rect * srcrect, const SDL_Rect * dstrect)
1908
e079dafea2bf Implemented fully featured dummy renderer
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diff changeset
219 {
1912
8d384b647307 Setting up the OpenGL support
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parents: 1908
diff changeset
220 SDL_DUMMY_RenderData *data =
8d384b647307 Setting up the OpenGL support
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parents: 1908
diff changeset
221 (SDL_DUMMY_RenderData *) renderer->driverdata;
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
222 SDL_Window *window = SDL_GetWindowFromID(renderer->window);
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
223 SDL_VideoDisplay *display = SDL_GetDisplayFromWindow(window);
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
224
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
225 if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
226 SDL_Surface *target = data->screens[data->current_screen];
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
227 void *pixels =
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
228 (Uint8 *) target->pixels + dstrect->y * target->pitch +
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
229 dstrect->x * target->format->BytesPerPixel;
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
230 return SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
231 srcrect, display->current_mode.format,
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
232 dstrect->w, dstrect->h, pixels,
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
233 target->pitch);
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
234 } else {
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
235 SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
236 SDL_Surface *target = data->screens[data->current_screen];
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2262
diff changeset
237 SDL_Rect real_srcrect = *srcrect;
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2262
diff changeset
238 SDL_Rect real_dstrect = *dstrect;
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
239
2267
c785543d1843 Okay, still some bugs, but everything builds again...
Sam Lantinga <slouken@libsdl.org>
parents: 2262
diff changeset
240 return SDL_LowerBlit(surface, &real_srcrect, target, &real_dstrect);
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
241 }
e079dafea2bf Implemented fully featured dummy renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1907
diff changeset
242 }
e079dafea2bf Implemented fully featured dummy renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1907
diff changeset
243
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
244 static void
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 SDL_DUMMY_RenderPresent(SDL_Renderer * renderer)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
246 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 static int frame_number;
1912
8d384b647307 Setting up the OpenGL support
Sam Lantinga <slouken@libsdl.org>
parents: 1908
diff changeset
248 SDL_DUMMY_RenderData *data =
8d384b647307 Setting up the OpenGL support
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parents: 1908
diff changeset
249 (SDL_DUMMY_RenderData *) renderer->driverdata;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents:
diff changeset
250
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
251 /* Send the data to the display */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 if (SDL_getenv("SDL_VIDEO_DUMMY_SAVE_FRAMES")) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 char file[128];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 SDL_snprintf(file, sizeof(file), "SDL_window%d-%8.8d.bmp",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 renderer->window, ++frame_number);
1908
e079dafea2bf Implemented fully featured dummy renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1907
diff changeset
256 SDL_SaveBMP(data->screens[data->current_screen], file);
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
257 }
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
258
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
259 /* Update the flipping chain, if any */
1965
a788656ca29a SDL constants are all uppercase.
Sam Lantinga <slouken@libsdl.org>
parents: 1912
diff changeset
260 if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
1908
e079dafea2bf Implemented fully featured dummy renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1907
diff changeset
261 data->current_screen = (data->current_screen + 1) % 2;
1965
a788656ca29a SDL constants are all uppercase.
Sam Lantinga <slouken@libsdl.org>
parents: 1912
diff changeset
262 } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
1908
e079dafea2bf Implemented fully featured dummy renderer
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parents: 1907
diff changeset
263 data->current_screen = (data->current_screen + 1) % 3;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
266
1908
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267 static void
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268 SDL_DUMMY_DestroyRenderer(SDL_Renderer * renderer)
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269 {
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8d384b647307 Setting up the OpenGL support
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270 SDL_DUMMY_RenderData *data =
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271 (SDL_DUMMY_RenderData *) renderer->driverdata;
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272 int i;
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273
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274 if (data) {
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275 for (i = 0; i < SDL_arraysize(data->screens); ++i) {
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276 if (data->screens[i]) {
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277 SDL_FreeSurface(data->screens[i]);
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278 }
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279 }
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280 SDL_free(data);
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281 }
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282 SDL_free(renderer);
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283 }
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284
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285 /* vi: set ts=4 sw=4 expandtab: */