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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 /* WGL implementation of SDL OpenGL support */ |
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25 |
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26 #if SDL_VIDEO_OPENGL |
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27 #include "SDL_opengl.h" |
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28 #endif |
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29 #include "SDL_lowvideo.h" |
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30 #include "SDL_wingl_c.h" |
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31 |
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32 #if SDL_VIDEO_OPENGL |
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33 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" |
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34 #endif |
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35 |
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36 /* If setting the HDC fails, we may need to recreate the window (MSDN) */ |
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37 static int WIN_GL_ResetWindow(_THIS) |
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38 { |
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39 int status = 0; |
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40 |
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41 #ifndef _WIN32_WCE /* FIXME WinCE needs the UNICODE version of CreateWindow() */ |
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42 /* This doesn't work with DirectX code (see CVS comments) */ |
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43 /* If we were passed a window, then we can't create a new one */ |
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44 if ( !SDL_windowid && SDL_strcmp(this->name, "windib") == 0 ) { |
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45 /* Save the existing window attributes */ |
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46 LONG style; |
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47 RECT rect = { 0, 0, 0, 0 }; |
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48 style = GetWindowLong(SDL_Window, GWL_STYLE); |
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49 GetWindowRect(SDL_Window, &rect); |
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50 DestroyWindow(SDL_Window); |
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51 WIN_FlushMessageQueue(); |
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52 |
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53 SDL_resizing = 1; |
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54 SDL_Window = CreateWindow(SDL_Appname, SDL_Appname, |
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55 style, |
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56 rect.left, rect.top, |
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57 (rect.right-rect.left)+1, |
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58 (rect.bottom-rect.top)+1, |
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59 NULL, NULL, SDL_Instance, NULL); |
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60 WIN_FlushMessageQueue(); |
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61 SDL_resizing = 0; |
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62 |
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63 if ( SDL_Window ) { |
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64 this->SetCaption(this, this->wm_title, this->wm_icon); |
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65 } else { |
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66 SDL_SetError("Couldn't create window"); |
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67 status = -1; |
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68 } |
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69 } else |
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70 #endif /* !_WIN32_WCE */ |
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71 { |
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72 SDL_SetError("Unable to reset window for OpenGL context"); |
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73 status = -1; |
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74 } |
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75 return(status); |
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76 } |
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77 |
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78 #if SDL_VIDEO_OPENGL |
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79 |
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80 static int ExtensionSupported(const char *extension, const char *extensions) |
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81 { |
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82 const char *start; |
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83 const char *where, *terminator; |
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84 |
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85 /* Extension names should not have spaces. */ |
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86 where = SDL_strchr(extension, ' '); |
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87 if ( where || *extension == '\0' ) |
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88 return 0; |
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89 |
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90 if ( ! extensions ) |
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91 return 0; |
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92 |
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93 /* It takes a bit of care to be fool-proof about parsing the |
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94 * OpenGL extensions string. Don't be fooled by sub-strings, |
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95 * etc. */ |
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96 |
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97 start = extensions; |
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98 |
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99 for (;;) |
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100 { |
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101 where = SDL_strstr(start, extension); |
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102 if (!where) break; |
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103 |
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104 terminator = where + SDL_strlen(extension); |
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105 if (where == start || *(where - 1) == ' ') |
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106 if (*terminator == ' ' || *terminator == '\0') return 1; |
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107 |
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108 start = terminator; |
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109 } |
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110 |
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111 return 0; |
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112 } |
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113 |
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114 static int ChoosePixelFormatARB(_THIS, const int *iAttribs, const FLOAT *fAttribs) |
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115 { |
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116 HWND hwnd; |
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117 HDC hdc; |
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118 HGLRC hglrc; |
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119 const char * (WINAPI *wglGetExtensionsStringARB)(HDC) = 0; |
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120 const char *extensions; |
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121 int pformat = 0; |
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122 UINT matches = 0; |
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123 |
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124 hwnd = CreateWindow(SDL_Appname, SDL_Appname, WS_POPUP | WS_DISABLED, |
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125 0, 0, 10, 10, |
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126 NULL, NULL, SDL_Instance, NULL); |
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127 WIN_FlushMessageQueue(); |
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128 |
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129 hdc = GetDC(hwnd); |
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130 |
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131 SetPixelFormat(hdc, ChoosePixelFormat(hdc, &GL_pfd), &GL_pfd); |
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132 |
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133 hglrc = this->gl_data->wglCreateContext(hdc); |
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134 if ( hglrc ) { |
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135 this->gl_data->wglMakeCurrent(hdc, hglrc); |
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136 } |
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137 |
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138 wglGetExtensionsStringARB = (const char * (WINAPI *)(HDC)) |
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139 this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB"); |
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140 |
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141 if( wglGetExtensionsStringARB ) { |
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142 extensions = wglGetExtensionsStringARB(hdc); |
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143 } else { |
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144 extensions = NULL; |
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145 } |
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146 |
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147 this->gl_data->WGL_ARB_pixel_format = 0; |
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148 if( ExtensionSupported("WGL_ARB_pixel_format", extensions) ) { |
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149 BOOL (WINAPI *wglChoosePixelFormatARB)(HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats); |
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150 wglChoosePixelFormatARB = |
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151 (BOOL (WINAPI *)(HDC, const int *, const FLOAT *, UINT, int *, UINT *)) |
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152 this->gl_data->wglGetProcAddress("wglChoosePixelFormatARB"); |
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153 if( wglChoosePixelFormatARB && |
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154 wglChoosePixelFormatARB(hdc, iAttribs, fAttribs, 1, &pformat, &matches) && pformat ) { |
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155 this->gl_data->WGL_ARB_pixel_format = 1; |
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156 } |
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157 } |
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158 |
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159 if ( hglrc ) { |
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160 this->gl_data->wglMakeCurrent(NULL, NULL); |
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161 this->gl_data->wglDeleteContext(hglrc); |
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162 } |
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163 ReleaseDC(hwnd, hdc); |
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164 DestroyWindow(hwnd); |
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165 WIN_FlushMessageQueue(); |
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166 |
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167 return pformat; |
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168 } |
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169 |
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170 #endif /* SDL_VIDEO_OPENGL */ |
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171 |
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172 int WIN_GL_SetupWindow(_THIS) |
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173 { |
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174 int retval; |
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175 #if SDL_VIDEO_OPENGL |
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176 int i; |
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177 int iAttribs[64]; |
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178 int *iAttr; |
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179 float fAttribs[1] = { 0 }; |
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180 const GLubyte *(WINAPI *glGetStringFunc)(GLenum); |
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181 const char *wglext; |
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182 |
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183 /* load the gl driver from a default path */ |
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184 if ( ! this->gl_config.driver_loaded ) { |
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185 /* no driver has been loaded, use default (ourselves) */ |
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186 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { |
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187 return(-1); |
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188 } |
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189 } |
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190 |
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191 /* Set up the pixel format descriptor with our needed format */ |
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192 SDL_memset(&GL_pfd, 0, sizeof(GL_pfd)); |
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193 GL_pfd.nSize = sizeof(GL_pfd); |
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194 GL_pfd.nVersion = 1; |
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195 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); |
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196 if ( this->gl_config.double_buffer ) { |
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197 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; |
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198 } |
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199 if ( this->gl_config.stereo ) { |
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200 GL_pfd.dwFlags |= PFD_STEREO; |
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201 } |
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202 GL_pfd.iPixelType = PFD_TYPE_RGBA; |
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203 GL_pfd.cColorBits = this->gl_config.buffer_size; |
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204 GL_pfd.cRedBits = this->gl_config.red_size; |
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205 GL_pfd.cGreenBits = this->gl_config.green_size; |
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206 GL_pfd.cBlueBits = this->gl_config.blue_size; |
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207 GL_pfd.cAlphaBits = this->gl_config.alpha_size; |
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208 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; |
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209 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; |
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210 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; |
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211 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; |
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212 GL_pfd.cAccumBits = |
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213 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + |
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214 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); |
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215 GL_pfd.cDepthBits = this->gl_config.depth_size; |
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216 GL_pfd.cStencilBits = this->gl_config.stencil_size; |
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217 |
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218 /* setup WGL_ARB_pixel_format attribs */ |
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219 iAttr = &iAttribs[0]; |
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220 |
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221 *iAttr++ = WGL_DRAW_TO_WINDOW_ARB; |
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222 *iAttr++ = GL_TRUE; |
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223 *iAttr++ = WGL_ACCELERATION_ARB; |
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224 *iAttr++ = WGL_FULL_ACCELERATION_ARB; |
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225 *iAttr++ = WGL_RED_BITS_ARB; |
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226 *iAttr++ = this->gl_config.red_size; |
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227 *iAttr++ = WGL_GREEN_BITS_ARB; |
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228 *iAttr++ = this->gl_config.green_size; |
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229 *iAttr++ = WGL_BLUE_BITS_ARB; |
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230 *iAttr++ = this->gl_config.blue_size; |
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231 |
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232 if ( this->gl_config.alpha_size ) { |
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233 *iAttr++ = WGL_ALPHA_BITS_ARB; |
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234 *iAttr++ = this->gl_config.alpha_size; |
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235 } |
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236 |
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237 *iAttr++ = WGL_DOUBLE_BUFFER_ARB; |
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238 *iAttr++ = this->gl_config.double_buffer; |
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239 |
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240 *iAttr++ = WGL_DEPTH_BITS_ARB; |
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241 *iAttr++ = this->gl_config.depth_size; |
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242 |
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243 if ( this->gl_config.stencil_size ) { |
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244 *iAttr++ = WGL_STENCIL_BITS_ARB; |
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245 *iAttr++ = this->gl_config.stencil_size; |
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246 } |
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247 |
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248 if ( this->gl_config.accum_red_size ) { |
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249 *iAttr++ = WGL_ACCUM_RED_BITS_ARB; |
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250 *iAttr++ = this->gl_config.accum_red_size; |
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251 } |
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252 |
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253 if ( this->gl_config.accum_green_size ) { |
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254 *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB; |
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255 *iAttr++ = this->gl_config.accum_green_size; |
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256 } |
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257 |
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258 if ( this->gl_config.accum_blue_size ) { |
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259 *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB; |
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260 *iAttr++ = this->gl_config.accum_blue_size; |
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261 } |
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262 |
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263 if ( this->gl_config.accum_alpha_size ) { |
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264 *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB; |
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265 *iAttr++ = this->gl_config.accum_alpha_size; |
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266 } |
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267 |
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268 if ( this->gl_config.stereo ) { |
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269 *iAttr++ = WGL_STEREO_ARB; |
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270 *iAttr++ = GL_TRUE; |
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271 } |
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272 |
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273 if ( this->gl_config.multisamplebuffers ) { |
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274 *iAttr++ = WGL_SAMPLE_BUFFERS_ARB; |
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275 *iAttr++ = this->gl_config.multisamplebuffers; |
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276 } |
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277 |
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278 if ( this->gl_config.multisamplesamples ) { |
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279 *iAttr++ = WGL_SAMPLES_ARB; |
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280 *iAttr++ = this->gl_config.multisamplesamples; |
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281 } |
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282 |
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283 if ( this->gl_config.accelerated >= 0 ) { |
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284 *iAttr++ = WGL_ACCELERATION_ARB; |
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285 *iAttr++ = (this->gl_config.accelerated ? WGL_GENERIC_ACCELERATION_ARB : WGL_NO_ACCELERATION_ARB); |
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286 } |
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287 |
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288 *iAttr = 0; |
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289 |
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290 for ( i=0; ; ++i ) { |
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291 /* Get the window device context for our OpenGL drawing */ |
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292 GL_hdc = GetDC(SDL_Window); |
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293 if ( GL_hdc == NULL ) { |
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294 SDL_SetError("Unable to get DC for SDL_Window"); |
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295 return(-1); |
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296 } |
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297 |
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298 /* Choose and set the closest available pixel format */ |
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299 pixel_format = ChoosePixelFormatARB(this, iAttribs, fAttribs); |
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300 if ( !pixel_format ) { |
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301 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); |
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302 } |
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303 if ( !pixel_format ) { |
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304 SDL_SetError("No matching GL pixel format available"); |
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305 return(-1); |
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306 } |
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307 if ( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { |
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308 if ( i == 0 ) { |
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309 /* First time through, try resetting the window */ |
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310 if ( WIN_GL_ResetWindow(this) < 0 ) { |
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311 return(-1); |
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312 } |
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313 continue; |
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314 } |
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315 SDL_SetError("Unable to set HDC pixel format"); |
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316 return(-1); |
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317 } |
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318 /* We either succeeded or failed by this point */ |
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319 break; |
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320 } |
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321 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); |
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322 |
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323 GL_hrc = this->gl_data->wglCreateContext(GL_hdc); |
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324 if ( GL_hrc == NULL ) { |
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325 SDL_SetError("Unable to create GL context"); |
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326 return(-1); |
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327 } |
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328 if ( WIN_GL_MakeCurrent(this) < 0 ) { |
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329 return(-1); |
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330 } |
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331 gl_active = 1; |
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332 |
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333 /* Get the wglGetPixelFormatAttribivARB pointer for the context */ |
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334 if ( this->gl_data->WGL_ARB_pixel_format ) { |
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335 this->gl_data->wglGetPixelFormatAttribivARB = |
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336 (BOOL (WINAPI *)(HDC, int, int, UINT, const int *, int *)) |
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337 this->gl_data->wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
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338 } else { |
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339 this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
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340 } |
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341 |
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342 /* Vsync control under Windows. Checking glGetString here is |
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343 * somewhat a documented and reliable hack - it was originally |
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344 * as a feature added by mistake, but since so many people rely |
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345 * on it, it will not be removed. strstr should be safe here.*/ |
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346 glGetStringFunc = WIN_GL_GetProcAddress(this, "glGetString"); |
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347 if ( glGetStringFunc ) { |
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348 wglext = (const char *)glGetStringFunc(GL_EXTENSIONS); |
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349 } else { |
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350 /* Uh oh, something is seriously wrong here... */ |
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351 wglext = NULL; |
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352 } |
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353 if ( wglext && SDL_strstr(wglext, "WGL_EXT_swap_control") ) { |
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354 this->gl_data->wglSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglSwapIntervalEXT"); |
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355 this->gl_data->wglGetSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglGetSwapIntervalEXT"); |
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356 } else { |
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357 this->gl_data->wglSwapIntervalEXT = NULL; |
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358 this->gl_data->wglGetSwapIntervalEXT = NULL; |
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359 } |
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360 if ( this->gl_config.swap_control >= 0 ) { |
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361 if ( this->gl_data->wglSwapIntervalEXT ) { |
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362 this->gl_data->wglSwapIntervalEXT(this->gl_config.swap_control); |
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363 } |
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364 } |
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365 #else |
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366 SDL_SetError("WIN driver not configured with OpenGL"); |
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367 #endif |
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368 if ( gl_active ) { |
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369 retval = 0; |
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370 } else { |
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371 retval = -1; |
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372 } |
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373 return(retval); |
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374 } |
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375 |
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376 void WIN_GL_ShutDown(_THIS) |
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377 { |
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378 #if SDL_VIDEO_OPENGL |
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379 /* Clean up OpenGL */ |
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380 if ( GL_hrc ) { |
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381 this->gl_data->wglMakeCurrent(NULL, NULL); |
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382 this->gl_data->wglDeleteContext(GL_hrc); |
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383 GL_hrc = NULL; |
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384 } |
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385 if ( GL_hdc ) { |
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386 ReleaseDC(SDL_Window, GL_hdc); |
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387 GL_hdc = NULL; |
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388 } |
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389 gl_active = 0; |
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390 |
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391 WIN_GL_UnloadLibrary(this); |
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392 #endif /* SDL_VIDEO_OPENGL */ |
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393 } |
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394 |
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395 #if SDL_VIDEO_OPENGL |
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396 |
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397 /* Make the current context active */ |
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398 int WIN_GL_MakeCurrent(_THIS) |
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399 { |
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400 int retval; |
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401 |
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402 retval = 0; |
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403 if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) { |
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404 SDL_SetError("Unable to make GL context current"); |
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405 retval = -1; |
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406 } |
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407 return(retval); |
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408 } |
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409 |
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410 /* Get attribute data from wgl. */ |
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411 int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) |
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412 { |
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413 int retval; |
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414 |
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415 if (attrib == SDL_GL_SWAP_CONTROL) { |
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416 if ( this->gl_data->wglGetSwapIntervalEXT ) { |
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417 *value = this->gl_data->wglGetSwapIntervalEXT(); |
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418 return 0; |
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419 } |
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420 return -1; |
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421 } |
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422 |
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423 if ( this->gl_data->wglGetPixelFormatAttribivARB ) { |
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424 int wgl_attrib; |
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425 |
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426 switch(attrib) { |
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427 case SDL_GL_RED_SIZE: |
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428 wgl_attrib = WGL_RED_BITS_ARB; |
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429 break; |
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430 case SDL_GL_GREEN_SIZE: |
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431 wgl_attrib = WGL_GREEN_BITS_ARB; |
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432 break; |
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433 case SDL_GL_BLUE_SIZE: |
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434 wgl_attrib = WGL_BLUE_BITS_ARB; |
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435 break; |
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436 case SDL_GL_ALPHA_SIZE: |
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437 wgl_attrib = WGL_ALPHA_BITS_ARB; |
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438 break; |
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439 case SDL_GL_DOUBLEBUFFER: |
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440 wgl_attrib = WGL_DOUBLE_BUFFER_ARB; |
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441 break; |
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442 case SDL_GL_BUFFER_SIZE: |
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443 wgl_attrib = WGL_COLOR_BITS_ARB; |
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444 break; |
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445 case SDL_GL_DEPTH_SIZE: |
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446 wgl_attrib = WGL_DEPTH_BITS_ARB; |
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447 break; |
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448 case SDL_GL_STENCIL_SIZE: |
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449 wgl_attrib = WGL_STENCIL_BITS_ARB; |
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450 break; |
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451 case SDL_GL_ACCUM_RED_SIZE: |
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452 wgl_attrib = WGL_ACCUM_RED_BITS_ARB; |
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453 break; |
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454 case SDL_GL_ACCUM_GREEN_SIZE: |
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455 wgl_attrib = WGL_ACCUM_GREEN_BITS_ARB; |
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456 break; |
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457 case SDL_GL_ACCUM_BLUE_SIZE: |
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458 wgl_attrib = WGL_ACCUM_BLUE_BITS_ARB; |
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459 break; |
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460 case SDL_GL_ACCUM_ALPHA_SIZE: |
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461 wgl_attrib = WGL_ACCUM_ALPHA_BITS_ARB; |
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462 break; |
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463 case SDL_GL_STEREO: |
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464 wgl_attrib = WGL_STEREO_ARB; |
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465 break; |
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466 case SDL_GL_MULTISAMPLEBUFFERS: |
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467 wgl_attrib = WGL_SAMPLE_BUFFERS_ARB; |
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468 break; |
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469 case SDL_GL_MULTISAMPLESAMPLES: |
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470 wgl_attrib = WGL_SAMPLES_ARB; |
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471 break; |
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472 case SDL_GL_ACCELERATED_VISUAL: |
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473 wgl_attrib = WGL_ACCELERATION_ARB; |
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474 this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
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475 if ( *value == WGL_NO_ACCELERATION_ARB ) { |
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476 *value = SDL_FALSE; |
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477 } else { |
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478 *value = SDL_TRUE; |
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479 } |
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480 return 0; |
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481 default: |
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482 return(-1); |
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483 } |
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484 this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
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485 |
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486 return 0; |
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487 } |
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488 |
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489 retval = 0; |
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490 switch ( attrib ) { |
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491 case SDL_GL_RED_SIZE: |
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492 *value = GL_pfd.cRedBits; |
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493 break; |
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494 case SDL_GL_GREEN_SIZE: |
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495 *value = GL_pfd.cGreenBits; |
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496 break; |
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497 case SDL_GL_BLUE_SIZE: |
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498 *value = GL_pfd.cBlueBits; |
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499 break; |
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500 case SDL_GL_ALPHA_SIZE: |
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501 *value = GL_pfd.cAlphaBits; |
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502 break; |
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503 case SDL_GL_DOUBLEBUFFER: |
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504 if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) { |
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505 *value = 1; |
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506 } else { |
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507 *value = 0; |
|
508 } |
|
509 break; |
|
510 case SDL_GL_BUFFER_SIZE: |
|
511 *value = GL_pfd.cColorBits; |
|
512 break; |
|
513 case SDL_GL_DEPTH_SIZE: |
|
514 *value = GL_pfd.cDepthBits; |
|
515 break; |
|
516 case SDL_GL_STENCIL_SIZE: |
|
517 *value = GL_pfd.cStencilBits; |
|
518 break; |
|
519 case SDL_GL_ACCUM_RED_SIZE: |
|
520 *value = GL_pfd.cAccumRedBits; |
|
521 break; |
|
522 case SDL_GL_ACCUM_GREEN_SIZE: |
|
523 *value = GL_pfd.cAccumGreenBits; |
|
524 break; |
|
525 case SDL_GL_ACCUM_BLUE_SIZE: |
|
526 *value = GL_pfd.cAccumBlueBits; |
|
527 break; |
|
528 case SDL_GL_ACCUM_ALPHA_SIZE: |
|
529 *value = GL_pfd.cAccumAlphaBits; |
|
530 break; |
|
531 case SDL_GL_STEREO: |
|
532 if ( GL_pfd.dwFlags & PFD_STEREO ) { |
|
533 *value = 1; |
|
534 } else { |
|
535 *value = 0; |
|
536 } |
|
537 break; |
|
538 case SDL_GL_MULTISAMPLEBUFFERS: |
|
539 *value = 0; |
|
540 break; |
|
541 case SDL_GL_MULTISAMPLESAMPLES: |
|
542 *value = 1; |
|
543 break; |
|
544 case SDL_GL_SWAP_CONTROL: |
|
545 if ( this->gl_data->wglGetSwapIntervalEXT ) { |
|
546 *value = this->gl_data->wglGetSwapIntervalEXT(); |
|
547 return 0; |
|
548 } else { |
|
549 return -1; |
|
550 } |
|
551 break; |
|
552 default: |
|
553 retval = -1; |
|
554 break; |
|
555 } |
|
556 return retval; |
|
557 } |
|
558 |
|
559 void WIN_GL_SwapBuffers(_THIS) |
|
560 { |
|
561 SwapBuffers(GL_hdc); |
|
562 } |
|
563 |
|
564 void WIN_GL_UnloadLibrary(_THIS) |
|
565 { |
|
566 if ( this->gl_config.driver_loaded ) { |
|
567 FreeLibrary((HMODULE)this->gl_config.dll_handle); |
|
568 |
|
569 this->gl_data->wglGetProcAddress = NULL; |
|
570 this->gl_data->wglCreateContext = NULL; |
|
571 this->gl_data->wglDeleteContext = NULL; |
|
572 this->gl_data->wglMakeCurrent = NULL; |
|
573 this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
|
574 this->gl_data->wglSwapIntervalEXT = NULL; |
|
575 this->gl_data->wglGetSwapIntervalEXT = NULL; |
|
576 |
|
577 this->gl_config.dll_handle = NULL; |
|
578 this->gl_config.driver_loaded = 0; |
|
579 } |
|
580 } |
|
581 |
|
582 /* Passing a NULL path means load pointers from the application */ |
|
583 int WIN_GL_LoadLibrary(_THIS, const char* path) |
|
584 { |
|
585 HMODULE handle; |
|
586 |
|
587 if ( gl_active ) { |
|
588 SDL_SetError("OpenGL context already created"); |
|
589 return -1; |
|
590 } |
|
591 |
|
592 if ( path == NULL ) { |
|
593 path = DEFAULT_GL_DRIVER_PATH; |
|
594 } |
|
595 handle = LoadLibrary(path); |
|
596 if ( handle == NULL ) { |
|
597 SDL_SetError("Could not load OpenGL library"); |
|
598 return -1; |
|
599 } |
|
600 |
|
601 /* Unload the old driver and reset the pointers */ |
|
602 WIN_GL_UnloadLibrary(this); |
|
603 |
|
604 /* Load new function pointers */ |
|
605 SDL_memset(this->gl_data, 0, sizeof(*this->gl_data)); |
|
606 this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *)) |
|
607 GetProcAddress(handle, "wglGetProcAddress"); |
|
608 this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC)) |
|
609 GetProcAddress(handle, "wglCreateContext"); |
|
610 this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC)) |
|
611 GetProcAddress(handle, "wglDeleteContext"); |
|
612 this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC)) |
|
613 GetProcAddress(handle, "wglMakeCurrent"); |
|
614 this->gl_data->wglSwapIntervalEXT = (void (WINAPI *)(int)) |
|
615 GetProcAddress(handle, "wglSwapIntervalEXT"); |
|
616 this->gl_data->wglGetSwapIntervalEXT = (int (WINAPI *)(void)) |
|
617 GetProcAddress(handle, "wglGetSwapIntervalEXT"); |
|
618 |
|
619 if ( (this->gl_data->wglGetProcAddress == NULL) || |
|
620 (this->gl_data->wglCreateContext == NULL) || |
|
621 (this->gl_data->wglDeleteContext == NULL) || |
|
622 (this->gl_data->wglMakeCurrent == NULL) ) { |
|
623 SDL_SetError("Could not retrieve OpenGL functions"); |
|
624 FreeLibrary(handle); |
|
625 return -1; |
|
626 } |
|
627 |
|
628 this->gl_config.dll_handle = handle; |
|
629 SDL_strlcpy(this->gl_config.driver_path, path, SDL_arraysize(this->gl_config.driver_path)); |
|
630 this->gl_config.driver_loaded = 1; |
|
631 return 0; |
|
632 } |
|
633 |
|
634 void *WIN_GL_GetProcAddress(_THIS, const char* proc) |
|
635 { |
|
636 void *func; |
|
637 |
|
638 /* This is to pick up extensions */ |
|
639 func = this->gl_data->wglGetProcAddress(proc); |
|
640 if ( ! func ) { |
|
641 /* This is probably a normal GL function */ |
|
642 func = GetProcAddress(this->gl_config.dll_handle, proc); |
|
643 } |
|
644 return func; |
|
645 } |
|
646 |
|
647 #endif /* SDL_VIDEO_OPENGL */ |