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comparison src/video/wincommon/SDL_wingl.c @ 373:c638fde8a824

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Fixed setting OpenGL mode multiple times on Windows
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 May 2002 22:27:42 +0000
parents 13fc64213765
children 8a43e0cbf02f
comparison
equal deleted inserted replaced
372:7e9e5a51c5f9 373:c638fde8a824
34 34
35 #ifdef HAVE_OPENGL 35 #ifdef HAVE_OPENGL
36 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" 36 #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL"
37 #endif 37 #endif
38 38
39 /* If setting the HDC fails, we may need to recreate the window (MSDN) */
40 static int WIN_GL_ResetWindow(_THIS)
41 {
42 int status = 0;
43 int can_reset = 1;
44
45 /* If we were passed a window, then we can't create a new one */
46 if ( SDL_windowid ) {
47 can_reset = 0;
48 }
49 #ifndef _WIN32_WCE /* FIXME WinCE needs the UNICODE version of CreateWindow() */
50 if ( can_reset ) {
51 /* Save the existing window attributes */
52 LONG style;
53 RECT rect = { 0, 0, 0, 0 };
54 style = GetWindowLong(SDL_Window, GWL_STYLE);
55 GetWindowRect(SDL_Window, &rect);
56 DestroyWindow(SDL_Window);
57 SDL_Window = CreateWindow(SDL_Appname, SDL_Appname,
58 style,
59 rect.left, rect.top,
60 (rect.right-rect.left)+1,
61 (rect.top-rect.bottom)+1,
62 NULL, NULL, SDL_Instance, NULL);
63 if ( SDL_Window ) {
64 this->SetCaption(this, this->wm_title, this->wm_icon);
65 } else {
66 SDL_SetError("Couldn't create window");
67 status = -1;
68 }
69 } else
70 #endif /* !_WIN32_WCE */
71 {
72 SDL_SetError("Unable to reset window for OpenGL context");
73 status = -1;
74 }
75 return(status);
76 }
39 77
40 int WIN_GL_SetupWindow(_THIS) 78 int WIN_GL_SetupWindow(_THIS)
41 { 79 {
42 int retval; 80 int retval;
43 #ifdef HAVE_OPENGL 81 #ifdef HAVE_OPENGL
82 int i;
44 int pixel_format; 83 int pixel_format;
45 84
46 /* load the gl driver from a default path */ 85 /* load the gl driver from a default path */
47 if ( ! this->gl_config.driver_loaded ) { 86 if ( ! this->gl_config.driver_loaded ) {
48 /* no driver has been loaded, use default (ourselves) */ 87 /* no driver has been loaded, use default (ourselves) */
49 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { 88 if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) {
50 return(-1); 89 return(-1);
51 } 90 }
52 } 91 }
53 92
54 /* Get the window device context for our OpenGL drawing */ 93 for ( i=0; ; ++i ) {
55 GL_hdc = GetDC(SDL_Window); 94 /* Get the window device context for our OpenGL drawing */
56 if ( GL_hdc == NULL ) { 95 GL_hdc = GetDC(SDL_Window);
57 SDL_SetError("Unable to get DC for SDL_Window"); 96 if ( GL_hdc == NULL ) {
58 return(-1); 97 SDL_SetError("Unable to get DC for SDL_Window");
59 } 98 return(-1);
60 99 }
61 /* Set up the pixel format descriptor with our needed format */ 100
62 memset(&GL_pfd, 0, sizeof(GL_pfd)); 101 /* Set up the pixel format descriptor with our needed format */
63 GL_pfd.nSize = sizeof(GL_pfd); 102 memset(&GL_pfd, 0, sizeof(GL_pfd));
64 GL_pfd.nVersion = 1; 103 GL_pfd.nSize = sizeof(GL_pfd);
65 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); 104 GL_pfd.nVersion = 1;
66 if ( this->gl_config.double_buffer ) { 105 GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL);
67 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; 106 if ( this->gl_config.double_buffer ) {
68 } 107 GL_pfd.dwFlags |= PFD_DOUBLEBUFFER;
69 GL_pfd.iPixelType = PFD_TYPE_RGBA; 108 }
70 GL_pfd.cColorBits = this->gl_config.buffer_size; 109 GL_pfd.iPixelType = PFD_TYPE_RGBA;
71 GL_pfd.cRedBits = this->gl_config.red_size; 110 GL_pfd.cColorBits = this->gl_config.buffer_size;
72 GL_pfd.cGreenBits = this->gl_config.green_size; 111 GL_pfd.cRedBits = this->gl_config.red_size;
73 GL_pfd.cBlueBits = this->gl_config.blue_size; 112 GL_pfd.cGreenBits = this->gl_config.green_size;
74 GL_pfd.cAlphaBits = this->gl_config.alpha_size; 113 GL_pfd.cBlueBits = this->gl_config.blue_size;
75 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; 114 GL_pfd.cAlphaBits = this->gl_config.alpha_size;
76 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; 115 GL_pfd.cAccumRedBits = this->gl_config.accum_red_size;
77 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; 116 GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size;
78 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; 117 GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size;
79 GL_pfd.cAccumBits = 118 GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size;
80 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + 119 GL_pfd.cAccumBits =
81 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); 120 (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits +
82 GL_pfd.cDepthBits = this->gl_config.depth_size; 121 GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits);
83 GL_pfd.cStencilBits = this->gl_config.stencil_size; 122 GL_pfd.cDepthBits = this->gl_config.depth_size;
84 123 GL_pfd.cStencilBits = this->gl_config.stencil_size;
85 /* Choose and set the closest available pixel format */ 124
86 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); 125 /* Choose and set the closest available pixel format */
87 if ( !pixel_format ) { 126 pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd);
88 SDL_SetError("No matching GL pixel format available"); 127 if ( !pixel_format ) {
89 return(-1); 128 SDL_SetError("No matching GL pixel format available");
90 } 129 return(-1);
91 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { 130 }
92 SDL_SetError("Unable to set HDC pixel format"); 131 if( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) {
93 return(-1); 132 if ( i == 0 ) {
133 /* First time through, try resetting the window */
134 if ( WIN_GL_ResetWindow(this) < 0 ) {
135 return(-1);
136 }
137 continue;
138 }
139 SDL_SetError("Unable to set HDC pixel format");
140 return(-1);
141 }
142 /* We either succeeded or failed by this point */
143 break;
94 } 144 }
95 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); 145 DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd);
96 146
97 GL_hrc = this->gl_data->wglCreateContext(GL_hdc); 147 GL_hrc = this->gl_data->wglCreateContext(GL_hdc);
98 if( GL_hrc == NULL ) { 148 if( GL_hrc == NULL ) {