src/video/x11/SDL_x11opengles.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 02 Aug 2017 10:22:48 -0700
changeset 11175 cbc6a8a5b701
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Fixed bug 3690 - SDL2 KMS/DRM render context support

Manuel

The attached patch adds support for KMS/DRM context graphics.

It builds with no problem on X86_64 GNU/Linux systems, provided the needed libraries are present, and on ARM GNU/Linux systems that have KMS/DRM support and a GLES2 implementation.
Tested on Raspberry Pi: KMS/DRM is what the Raspberry Pi will use as default in the near future, once the propietary DispmanX API by Broadcom is overtaken by open graphics stack, it's possible to boot current Raspbian system in KMS mode by adding "dtoverlay=vc4-kms-v3d" to config.txt on Raspbian's boot partition.
X86 systems use KMS right away in every current GNU/Linux system.

Simple build instructions:

$./autogen.sh
$./configure --enable-video-kmsdrm
$make
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2017 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_internal.h"
    22 
    23 #if SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_OPENGL_EGL
    24 
    25 #include "SDL_x11video.h"
    26 #include "SDL_x11opengles.h"
    27 #include "SDL_x11opengl.h"
    28 
    29 /* EGL implementation of SDL OpenGL support */
    30 
    31 int
    32 X11_GLES_LoadLibrary(_THIS, const char *path)
    33 {
    34     SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
    35 
    36     /* If the profile requested is not GL ES, switch over to X11_GL functions  */
    37     if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
    38         #if SDL_VIDEO_OPENGL_GLX
    39         X11_GLES_UnloadLibrary(_this);
    40         _this->GL_LoadLibrary = X11_GL_LoadLibrary;
    41         _this->GL_GetProcAddress = X11_GL_GetProcAddress;
    42         _this->GL_UnloadLibrary = X11_GL_UnloadLibrary;
    43         _this->GL_CreateContext = X11_GL_CreateContext;
    44         _this->GL_MakeCurrent = X11_GL_MakeCurrent;
    45         _this->GL_SetSwapInterval = X11_GL_SetSwapInterval;
    46         _this->GL_GetSwapInterval = X11_GL_GetSwapInterval;
    47         _this->GL_SwapWindow = X11_GL_SwapWindow;
    48         _this->GL_DeleteContext = X11_GL_DeleteContext;
    49         return X11_GL_LoadLibrary(_this, path);
    50         #else
    51         return SDL_SetError("SDL not configured with OpenGL/GLX support");
    52         #endif
    53     }
    54     
    55     return SDL_EGL_LoadLibrary(_this, path, (NativeDisplayType) data->display, 0);
    56 }
    57 
    58 XVisualInfo *
    59 X11_GLES_GetVisual(_THIS, Display * display, int screen)
    60 {
    61    
    62     XVisualInfo *egl_visualinfo = NULL;
    63     EGLint visual_id;
    64     XVisualInfo vi_in;
    65     int out_count;
    66 
    67     if (!_this->egl_data) {
    68         /* The EGL library wasn't loaded, SDL_GetError() should have info */
    69         return NULL;
    70     }
    71 
    72     if (_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,
    73                                             _this->egl_data->egl_config,
    74                                             EGL_NATIVE_VISUAL_ID,
    75                                             &visual_id) == EGL_FALSE || !visual_id) {
    76         /* Use the default visual when all else fails */
    77         vi_in.screen = screen;
    78         egl_visualinfo = X11_XGetVisualInfo(display,
    79                                         VisualScreenMask,
    80                                         &vi_in, &out_count);
    81     } else {
    82         vi_in.screen = screen;
    83         vi_in.visualid = visual_id;
    84         egl_visualinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &vi_in, &out_count);
    85     }
    86 
    87     return egl_visualinfo;
    88 }
    89 
    90 SDL_GLContext
    91 X11_GLES_CreateContext(_THIS, SDL_Window * window)
    92 {
    93     SDL_GLContext context;
    94     SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
    95     Display *display = data->videodata->display;
    96 
    97     X11_XSync(display, False);
    98     context = SDL_EGL_CreateContext(_this, data->egl_surface);
    99     X11_XSync(display, False);
   100 
   101     return context;
   102 }
   103 
   104 SDL_EGL_SwapWindow_impl(X11)
   105 SDL_EGL_MakeCurrent_impl(X11)
   106 
   107 #endif /* SDL_VIDEO_DRIVER_X11 && SDL_VIDEO_OPENGL_EGL */
   108 
   109 /* vi: set ts=4 sw=4 expandtab: */