src/video/windows/SDL_windowsopengl.h
author Sam Lantinga <slouken@libsdl.org>
Sun, 12 Aug 2012 11:16:24 -0700
changeset 6393 a773384edf20
parent 6384 2fead9daad7e
child 6885 700f1b25f77f
permissions -rwxr-xr-x
Fixed bug 1565 - some small GL context creation enhancements

Matthias Bentrup 2012-08-09 12:53:17 PDT

With OpenGL 4.3 the ARB added a new context flag for context reset isolation
and renamed the existing ES2 profile bit to ES profile bit, as it can be used
to request GLES 3 compatible contexts, too.

This patch adds these changes to SDL on Linux and Windows.

Also SDL lacks the ability to create shared contexts. This patch also adds a
new GL attribute to enable context sharing. As casting a GL context to int is
not portable, I added only a boolean attribute
SDL_GL_SHARE_WITH_CURRENT_CONTEXT, which makes the new context share resources
with the context current on the creating thread.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 #ifndef _SDL_windowsopengl_h
    24 #define _SDL_windowsopengl_h
    25 
    26 #if SDL_VIDEO_OPENGL_WGL
    27 
    28 struct SDL_GLDriverData
    29 {
    30     SDL_bool HAS_WGL_ARB_pixel_format;
    31     SDL_bool HAS_WGL_EXT_swap_control_tear;
    32 
    33     void *(WINAPI * wglGetProcAddress) (const char *proc);
    34       HGLRC(WINAPI * wglCreateContext) (HDC hdc);
    35       BOOL(WINAPI * wglDeleteContext) (HGLRC hglrc);
    36       BOOL(WINAPI * wglMakeCurrent) (HDC hdc, HGLRC hglrc);
    37       BOOL(WINAPI * wglShareLists) (HGLRC hglrc1, HGLRC hglrc2);
    38       BOOL(WINAPI * wglChoosePixelFormatARB) (HDC hdc,
    39                                               const int *piAttribIList,
    40                                               const FLOAT * pfAttribFList,
    41                                               UINT nMaxFormats,
    42                                               int *piFormats,
    43                                               UINT * nNumFormats);
    44       BOOL(WINAPI * wglGetPixelFormatAttribivARB) (HDC hdc, int iPixelFormat,
    45                                                    int iLayerPlane,
    46                                                    UINT nAttributes,
    47                                                    const int *piAttributes,
    48                                                    int *piValues);
    49     BOOL (WINAPI * wglSwapIntervalEXT) (int interval);
    50     int (WINAPI * wglGetSwapIntervalEXT) (void);
    51 };
    52 
    53 /* OpenGL functions */
    54 extern int WIN_GL_LoadLibrary(_THIS, const char *path);
    55 extern void *WIN_GL_GetProcAddress(_THIS, const char *proc);
    56 extern void WIN_GL_UnloadLibrary(_THIS);
    57 extern int WIN_GL_SetupWindow(_THIS, SDL_Window * window);
    58 extern SDL_GLContext WIN_GL_CreateContext(_THIS, SDL_Window * window);
    59 extern int WIN_GL_MakeCurrent(_THIS, SDL_Window * window,
    60                               SDL_GLContext context);
    61 extern int WIN_GL_SetSwapInterval(_THIS, int interval);
    62 extern int WIN_GL_GetSwapInterval(_THIS);
    63 extern void WIN_GL_SwapWindow(_THIS, SDL_Window * window);
    64 extern void WIN_GL_DeleteContext(_THIS, SDL_GLContext context);
    65 
    66 #ifndef WGL_ARB_pixel_format
    67 #define WGL_NUMBER_PIXEL_FORMATS_ARB   0x2000
    68 #define WGL_DRAW_TO_WINDOW_ARB         0x2001
    69 #define WGL_DRAW_TO_BITMAP_ARB         0x2002
    70 #define WGL_ACCELERATION_ARB           0x2003
    71 #define WGL_NEED_PALETTE_ARB           0x2004
    72 #define WGL_NEED_SYSTEM_PALETTE_ARB    0x2005
    73 #define WGL_SWAP_LAYER_BUFFERS_ARB     0x2006
    74 #define WGL_SWAP_METHOD_ARB            0x2007
    75 #define WGL_NUMBER_OVERLAYS_ARB        0x2008
    76 #define WGL_NUMBER_UNDERLAYS_ARB       0x2009
    77 #define WGL_TRANSPARENT_ARB            0x200A
    78 #define WGL_TRANSPARENT_RED_VALUE_ARB  0x2037
    79 #define WGL_TRANSPARENT_GREEN_VALUE_ARB 0x2038
    80 #define WGL_TRANSPARENT_BLUE_VALUE_ARB 0x2039
    81 #define WGL_TRANSPARENT_ALPHA_VALUE_ARB 0x203A
    82 #define WGL_TRANSPARENT_INDEX_VALUE_ARB 0x203B
    83 #define WGL_SHARE_DEPTH_ARB            0x200C
    84 #define WGL_SHARE_STENCIL_ARB          0x200D
    85 #define WGL_SHARE_ACCUM_ARB            0x200E
    86 #define WGL_SUPPORT_GDI_ARB            0x200F
    87 #define WGL_SUPPORT_OPENGL_ARB         0x2010
    88 #define WGL_DOUBLE_BUFFER_ARB          0x2011
    89 #define WGL_STEREO_ARB                 0x2012
    90 #define WGL_PIXEL_TYPE_ARB             0x2013
    91 #define WGL_COLOR_BITS_ARB             0x2014
    92 #define WGL_RED_BITS_ARB               0x2015
    93 #define WGL_RED_SHIFT_ARB              0x2016
    94 #define WGL_GREEN_BITS_ARB             0x2017
    95 #define WGL_GREEN_SHIFT_ARB            0x2018
    96 #define WGL_BLUE_BITS_ARB              0x2019
    97 #define WGL_BLUE_SHIFT_ARB             0x201A
    98 #define WGL_ALPHA_BITS_ARB             0x201B
    99 #define WGL_ALPHA_SHIFT_ARB            0x201C
   100 #define WGL_ACCUM_BITS_ARB             0x201D
   101 #define WGL_ACCUM_RED_BITS_ARB         0x201E
   102 #define WGL_ACCUM_GREEN_BITS_ARB       0x201F
   103 #define WGL_ACCUM_BLUE_BITS_ARB        0x2020
   104 #define WGL_ACCUM_ALPHA_BITS_ARB       0x2021
   105 #define WGL_DEPTH_BITS_ARB             0x2022
   106 #define WGL_STENCIL_BITS_ARB           0x2023
   107 #define WGL_AUX_BUFFERS_ARB            0x2024
   108 #define WGL_NO_ACCELERATION_ARB        0x2025
   109 #define WGL_GENERIC_ACCELERATION_ARB   0x2026
   110 #define WGL_FULL_ACCELERATION_ARB      0x2027
   111 #define WGL_SWAP_EXCHANGE_ARB          0x2028
   112 #define WGL_SWAP_COPY_ARB              0x2029
   113 #define WGL_SWAP_UNDEFINED_ARB         0x202A
   114 #define WGL_TYPE_RGBA_ARB              0x202B
   115 #define WGL_TYPE_COLORINDEX_ARB        0x202C
   116 #endif
   117 
   118 #ifndef WGL_ARB_multisample
   119 #define WGL_SAMPLE_BUFFERS_ARB         0x2041
   120 #define WGL_SAMPLES_ARB                0x2042
   121 #endif
   122 
   123 #endif /* SDL_VIDEO_OPENGL_WGL */
   124 
   125 #endif /* _SDL_windowsopengl_h */
   126 
   127 /* vi: set ts=4 sw=4 expandtab: */