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annotate src/video/dummy/SDL_nullvideo.c @ 1050:8e1815fd9777

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Holding down shift while moving the mouse's scrollwheel on MacOS X makes the OS report these are "horizontal scrollwheel" events, which confuses gaming apps in several legitimate conditions. Now all scrollwheel events are made to look vertical when passed to the app. Patch by John Knottenbelt. http://www.libsdl.org/pipermail/sdl/2005-March/067978.html
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 17 Apr 2005 10:32:41 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
1
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
1
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Dummy SDL video driver implementation; this is just enough to make an
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29 * SDL-based application THINK it's got a working video driver, for
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30 * applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
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31 * and also for use as a collection of stubs when porting SDL to a new
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32 * platform for which you haven't yet written a valid video driver.
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33 *
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34 * This is also a great way to determine bottlenecks: if you think that SDL
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35 * is a performance problem for a given platform, enable this driver, and
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36 * then see if your application runs faster without video overhead.
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37 *
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38 * Initial work by Ryan C. Gordon (icculus@linuxgames.com). A good portion
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39 * of this was cut-and-pasted from Stephane Peter's work in the AAlib
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40 * SDL video driver. Renamed to "DUMMY" by Sam Lantinga.
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41 */
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42
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43 #include <stdio.h>
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44 #include <stdlib.h>
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45 #include <string.h>
1
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46
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47 #include "SDL.h"
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48 #include "SDL_error.h"
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49 #include "SDL_video.h"
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50 #include "SDL_mouse.h"
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51 #include "SDL_sysvideo.h"
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52 #include "SDL_pixels_c.h"
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53 #include "SDL_events_c.h"
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54
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55 #include "SDL_nullvideo.h"
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56 #include "SDL_nullevents_c.h"
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57 #include "SDL_nullmouse_c.h"
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58
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59 #define DUMMYVID_DRIVER_NAME "dummy"
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60
1
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61 /* Initialization/Query functions */
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62 static int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat);
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63 static SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
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64 static SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
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65 static int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
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66 static void DUMMY_VideoQuit(_THIS);
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67
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68 /* Hardware surface functions */
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69 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface);
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70 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface);
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71 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface);
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72 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface);
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73
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74 /* etc. */
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75 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects);
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76
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77 /* DUMMY driver bootstrap functions */
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78
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79 static int DUMMY_Available(void)
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80 {
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81 const char *envr = getenv("SDL_VIDEODRIVER");
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82 if ((envr) && (strcmp(envr, DUMMYVID_DRIVER_NAME) == 0)) {
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83 return(1);
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84 }
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85
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86 return(0);
1
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87 }
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88
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89 static void DUMMY_DeleteDevice(SDL_VideoDevice *device)
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90 {
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91 free(device->hidden);
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92 free(device);
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93 }
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94
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95 static SDL_VideoDevice *DUMMY_CreateDevice(int devindex)
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96 {
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97 SDL_VideoDevice *device;
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98
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99 /* Initialize all variables that we clean on shutdown */
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100 device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
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101 if ( device ) {
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102 memset(device, 0, (sizeof *device));
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103 device->hidden = (struct SDL_PrivateVideoData *)
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104 malloc((sizeof *device->hidden));
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105 }
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106 if ( (device == NULL) || (device->hidden == NULL) ) {
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107 SDL_OutOfMemory();
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108 if ( device ) {
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109 free(device);
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110 }
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111 return(0);
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112 }
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113 memset(device->hidden, 0, (sizeof *device->hidden));
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114
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115 /* Set the function pointers */
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116 device->VideoInit = DUMMY_VideoInit;
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117 device->ListModes = DUMMY_ListModes;
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118 device->SetVideoMode = DUMMY_SetVideoMode;
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119 device->CreateYUVOverlay = NULL;
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120 device->SetColors = DUMMY_SetColors;
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121 device->UpdateRects = DUMMY_UpdateRects;
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122 device->VideoQuit = DUMMY_VideoQuit;
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123 device->AllocHWSurface = DUMMY_AllocHWSurface;
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124 device->CheckHWBlit = NULL;
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125 device->FillHWRect = NULL;
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126 device->SetHWColorKey = NULL;
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127 device->SetHWAlpha = NULL;
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128 device->LockHWSurface = DUMMY_LockHWSurface;
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129 device->UnlockHWSurface = DUMMY_UnlockHWSurface;
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130 device->FlipHWSurface = NULL;
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131 device->FreeHWSurface = DUMMY_FreeHWSurface;
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132 device->SetCaption = NULL;
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133 device->SetIcon = NULL;
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134 device->IconifyWindow = NULL;
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135 device->GrabInput = NULL;
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136 device->GetWMInfo = NULL;
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137 device->InitOSKeymap = DUMMY_InitOSKeymap;
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138 device->PumpEvents = DUMMY_PumpEvents;
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139
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140 device->free = DUMMY_DeleteDevice;
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141
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142 return device;
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143 }
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144
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145 VideoBootStrap DUMMY_bootstrap = {
86
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146 DUMMYVID_DRIVER_NAME, "SDL dummy video driver",
1
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147 DUMMY_Available, DUMMY_CreateDevice
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148 };
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149
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150
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151 int DUMMY_VideoInit(_THIS, SDL_PixelFormat *vformat)
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152 {
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153 fprintf(stderr, "WARNING: You are using the SDL dummy video driver!\n");
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154
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155 /* Determine the screen depth (use default 8-bit depth) */
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156 /* we change this during the SDL_SetVideoMode implementation... */
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157 vformat->BitsPerPixel = 8;
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158 vformat->BytesPerPixel = 1;
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159
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160 /* We're done! */
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161 return(0);
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162 }
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163
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164 SDL_Rect **DUMMY_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
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165 {
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166 return (SDL_Rect **) -1;
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167 }
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168
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169 SDL_Surface *DUMMY_SetVideoMode(_THIS, SDL_Surface *current,
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170 int width, int height, int bpp, Uint32 flags)
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171 {
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172 if ( this->hidden->buffer ) {
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173 free( this->hidden->buffer );
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174 }
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175
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176 this->hidden->buffer = malloc(width * height * (bpp / 8));
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177 if ( ! this->hidden->buffer ) {
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178 SDL_SetError("Couldn't allocate buffer for requested mode");
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179 return(NULL);
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180 }
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181
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182 /* printf("Setting mode %dx%d\n", width, height); */
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183
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184 memset(this->hidden->buffer, 0, width * height * (bpp / 8));
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185
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186 /* Allocate the new pixel format for the screen */
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187 if ( ! SDL_ReallocFormat(current, bpp, 0, 0, 0, 0) ) {
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188 free(this->hidden->buffer);
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189 this->hidden->buffer = NULL;
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190 SDL_SetError("Couldn't allocate new pixel format for requested mode");
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191 return(NULL);
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192 }
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193
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194 /* Set up the new mode framebuffer */
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195 current->flags = flags & SDL_FULLSCREEN;
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196 this->hidden->w = current->w = width;
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197 this->hidden->h = current->h = height;
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198 current->pitch = current->w * (bpp / 8);
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199 current->pixels = this->hidden->buffer;
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200
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201 /* We're done */
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202 return(current);
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203 }
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204
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205 /* We don't actually allow hardware surfaces other than the main one */
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206 static int DUMMY_AllocHWSurface(_THIS, SDL_Surface *surface)
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207 {
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208 return(-1);
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209 }
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210 static void DUMMY_FreeHWSurface(_THIS, SDL_Surface *surface)
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211 {
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212 return;
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213 }
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214
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215 /* We need to wait for vertical retrace on page flipped displays */
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216 static int DUMMY_LockHWSurface(_THIS, SDL_Surface *surface)
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217 {
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218 return(0);
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219 }
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220
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221 static void DUMMY_UnlockHWSurface(_THIS, SDL_Surface *surface)
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222 {
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223 return;
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diff changeset
224 }
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225
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226 static void DUMMY_UpdateRects(_THIS, int numrects, SDL_Rect *rects)
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227 {
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228 /* do nothing. */
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229 }
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230
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231 int DUMMY_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
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232 {
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233 /* do nothing of note. */
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234 return(1);
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235 }
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diff changeset
236
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237 /* Note: If we are terminated, this could be called in the middle of
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diff changeset
238 another SDL video routine -- notably UpdateRects.
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239 */
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diff changeset
240 void DUMMY_VideoQuit(_THIS)
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241 {
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242 if (this->screen->pixels != NULL)
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diff changeset
243 {
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244 free(this->screen->pixels);
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245 this->screen->pixels = NULL;
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246 }
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247 }