src/video/mir/SDL_miropengl.c
author Sam Lantinga <slouken@libsdl.org>
Wed, 02 Aug 2017 10:22:48 -0700
changeset 11175 cbc6a8a5b701
parent 11159 70eaadd05283
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 
    22 /*
    23   Contributed by Brandon Schaefer, <brandon.schaefer@canonical.com>
    24 */
    25 
    26 #include "../../SDL_internal.h"
    27 
    28 #if SDL_VIDEO_DRIVER_MIR
    29 
    30 #include "SDL_miropengl.h"
    31 
    32 #include "SDL_mirdyn.h"
    33 
    34 int
    35 MIR_GL_SwapWindow(_THIS, SDL_Window* window)
    36 {
    37     MIR_Window* mir_wind = window->driverdata;
    38 
    39     return SDL_EGL_SwapBuffers(_this, mir_wind->egl_surface);
    40 }
    41 
    42 int
    43 MIR_GL_MakeCurrent(_THIS, SDL_Window* window, SDL_GLContext context)
    44 {
    45   if (window) {
    46       EGLSurface egl_surface = ((MIR_Window*)window->driverdata)->egl_surface;
    47       return SDL_EGL_MakeCurrent(_this, egl_surface, context);
    48   }
    49 
    50   return SDL_EGL_MakeCurrent(_this, NULL, NULL);
    51 }
    52 
    53 SDL_GLContext
    54 MIR_GL_CreateContext(_THIS, SDL_Window* window)
    55 {
    56     MIR_Window* mir_window = window->driverdata;
    57 
    58     SDL_GLContext context;
    59     context = SDL_EGL_CreateContext(_this, mir_window->egl_surface);
    60 
    61     return context;
    62 }
    63 
    64 int
    65 MIR_GL_LoadLibrary(_THIS, const char* path)
    66 {
    67     MIR_Data* mir_data = _this->driverdata;
    68 
    69     SDL_EGL_LoadLibrary(_this, path, MIR_mir_connection_get_egl_native_display(mir_data->connection), 0);
    70 
    71     SDL_EGL_ChooseConfig(_this);
    72 
    73     return 0;
    74 }
    75 
    76 #endif /* SDL_VIDEO_DRIVER_MIR */
    77 
    78 /* vi: set ts=4 sw=4 expandtab: */