SDL_egl.c
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/*
* Simple DirectMedia Layer
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* Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
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*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
#if SDL_VIDEO_OPENGL_EGL
#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
#include "../core/windows/SDL_windows.h"
#endif
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#if SDL_VIDEO_DRIVER_ANDROID
#include <android/native_window.h>
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#include "../core/android/SDL_android.h"
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#endif
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#include "SDL_sysvideo.h"
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#include "SDL_log.h"
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#include "SDL_egl_c.h"
#include "SDL_loadso.h"
#include "SDL_hints.h"
#ifdef EGL_KHR_create_context
/* EGL_OPENGL_ES3_BIT_KHR was added in version 13 of the extension. */
#ifndef EGL_OPENGL_ES3_BIT_KHR
#define EGL_OPENGL_ES3_BIT_KHR 0x00000040
#endif
#endif /* EGL_KHR_create_context */
#if SDL_VIDEO_DRIVER_RPI
/* Raspbian places the OpenGL ES/EGL binaries in a non standard path */
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#define DEFAULT_EGL ( vc4 ? "libEGL.so.1" : "libbrcmEGL.so" )
#define DEFAULT_OGL_ES2 ( vc4 ? "libGLESv2.so.2" : "libbrcmGLESv2.so" )
#define ALT_EGL "libEGL.so"
#define ALT_OGL_ES2 "libGLESv2.so"
#define DEFAULT_OGL_ES_PVR ( vc4 ? "libGLES_CM.so.1" : "libbrcmGLESv2.so" )
#define DEFAULT_OGL_ES ( vc4 ? "libGLESv1_CM.so.1" : "libbrcmGLESv2.so" )
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#elif SDL_VIDEO_DRIVER_ANDROID || SDL_VIDEO_DRIVER_VIVANTE
/* Android */
#define DEFAULT_EGL "libEGL.so"
#define DEFAULT_OGL_ES2 "libGLESv2.so"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.so"
#define DEFAULT_OGL_ES "libGLESv1_CM.so"
#elif SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
/* EGL AND OpenGL ES support via ANGLE */
#define DEFAULT_EGL "libEGL.dll"
#define DEFAULT_OGL_ES2 "libGLESv2.dll"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.dll"
#define DEFAULT_OGL_ES "libGLESv1_CM.dll"
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#elif SDL_VIDEO_DRIVER_COCOA
/* EGL AND OpenGL ES support via ANGLE */
#define DEFAULT_EGL "libEGL.dylib"
#define DEFAULT_OGL_ES2 "libGLESv2.dylib"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.dylib" //???
#define DEFAULT_OGL_ES "libGLESv1_CM.dylib" //???
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#else
/* Desktop Linux */
#define DEFAULT_OGL "libGL.so.1"
#define DEFAULT_EGL "libEGL.so.1"
#define DEFAULT_OGL_ES2 "libGLESv2.so.2"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.so.1"
#define DEFAULT_OGL_ES "libGLESv1_CM.so.1"
#endif /* SDL_VIDEO_DRIVER_RPI */
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/** If we happen to not have this defined because of an older EGL version, just define it 0x0
as eglGetPlatformDisplayEXT will most likely be NULL if this is missing
*/
#ifndef EGL_PLATFORM_DEVICE_EXT
#define EGL_PLATFORM_DEVICE_EXT 0x0
#endif
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#ifdef SDL_VIDEO_STATIC_ANGLE
#define LOAD_FUNC(NAME) \
_this->egl_data->NAME = (void *)NAME;
#else
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#define LOAD_FUNC(NAME) \
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_this->egl_data->NAME = SDL_LoadFunction(_this->egl_data->dll_handle, #NAME); \
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if (!_this->egl_data->NAME) \
{ \
return SDL_SetError("Could not retrieve EGL function " #NAME); \
}
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/* it is allowed to not have some of the EGL extensions on start - attempts to use them will fail later. */
#define LOAD_FUNC_EGLEXT(NAME) \
_this->egl_data->NAME = _this->egl_data->eglGetProcAddress(#NAME);
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static const char * SDL_EGL_GetErrorName(EGLint eglErrorCode)
{
#define SDL_EGL_ERROR_TRANSLATE(e) case e: return #e;
switch (eglErrorCode) {
SDL_EGL_ERROR_TRANSLATE(EGL_SUCCESS);
SDL_EGL_ERROR_TRANSLATE(EGL_NOT_INITIALIZED);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_ACCESS);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_ALLOC);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_ATTRIBUTE);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_CONTEXT);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_CONFIG);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_CURRENT_SURFACE);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_DISPLAY);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_SURFACE);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_MATCH);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_PARAMETER);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_NATIVE_PIXMAP);
SDL_EGL_ERROR_TRANSLATE(EGL_BAD_NATIVE_WINDOW);
SDL_EGL_ERROR_TRANSLATE(EGL_CONTEXT_LOST);
}
return "";
}
int SDL_EGL_SetErrorEx(const char * message, const char * eglFunctionName, EGLint eglErrorCode)
{
const char * errorText = SDL_EGL_GetErrorName(eglErrorCode);
char altErrorText[32];
if (errorText[0] == '\0') {
/* An unknown-to-SDL error code was reported. Report its hexadecimal value, instead of its name. */
SDL_snprintf(altErrorText, SDL_arraysize(altErrorText), "0x%x", (unsigned int)eglErrorCode);
errorText = altErrorText;
}
return SDL_SetError("%s (call to %s failed, reporting an error of %s)", message, eglFunctionName, errorText);
}
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/* EGL implementation of SDL OpenGL ES support */
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typedef enum {
SDL_EGL_DISPLAY_EXTENSION,
SDL_EGL_CLIENT_EXTENSION
} SDL_EGL_ExtensionType;
static SDL_bool SDL_EGL_HasExtension(_THIS, SDL_EGL_ExtensionType type, const char *ext)
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size_t ext_len;
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const char *ext_override;
const char *egl_extstr;
const char *ext_start;
/* Invalid extensions can be rejected early */
if (ext == NULL || *ext == 0 || SDL_strchr(ext, ' ') != NULL) {
/* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "SDL_EGL_HasExtension: Invalid EGL extension"); */
return SDL_FALSE;
}
/* Extensions can be masked with an environment variable.
* Unlike the OpenGL override, this will use the set bits of an integer
* to disable the extension.
* Bit Action
* 0 If set, the display extension is masked and not present to SDL.
* 1 If set, the client extension is masked and not present to SDL.
*/
ext_override = SDL_getenv(ext);
if (ext_override != NULL) {
int disable_ext = SDL_atoi(ext_override);
if (disable_ext & 0x01 && type == SDL_EGL_DISPLAY_EXTENSION) {
return SDL_FALSE;
} else if (disable_ext & 0x02 && type == SDL_EGL_CLIENT_EXTENSION) {
return SDL_FALSE;
}
}
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ext_len = SDL_strlen(ext);
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switch (type) {
case SDL_EGL_DISPLAY_EXTENSION:
egl_extstr = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_EXTENSIONS);
break;
case SDL_EGL_CLIENT_EXTENSION:
/* EGL_EXT_client_extensions modifies eglQueryString to return client extensions
* if EGL_NO_DISPLAY is passed. Implementations without it are required to return NULL.
* This behavior is included in EGL 1.5.
*/
egl_extstr = _this->egl_data->eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
break;
default:
/* SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "SDL_EGL_HasExtension: Invalid extension type"); */
return SDL_FALSE;
}
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if (egl_extstr != NULL) {
ext_start = egl_extstr;
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while (*ext_start) {
ext_start = SDL_strstr(ext_start, ext);
if (ext_start == NULL) {
return SDL_FALSE;
}
/* Check if the match is not just a substring of one of the extensions */
if (ext_start == egl_extstr || *(ext_start - 1) == ' ') {
if (ext_start[ext_len] == ' ' || ext_start[ext_len] == 0) {
return SDL_TRUE;
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}
/* If the search stopped in the middle of an extension, skip to the end of it */
ext_start += ext_len;
while (*ext_start != ' ' && *ext_start != 0) {
ext_start++;
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}
}
}
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return SDL_FALSE;
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}
void *
SDL_EGL_GetProcAddress(_THIS, const char *proc)
{
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const Uint32 eglver = (((Uint32) _this->egl_data->egl_version_major) << 16) | ((Uint32) _this->egl_data->egl_version_minor);
const SDL_bool is_egl_15_or_later = eglver >= ((((Uint32) 1) << 16) | 5);
void *retval = NULL;
/* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */
/* EGL 1.5 can use eglGetProcAddress() for any symbol. 1.4 and earlier can't use it for core entry points. */
if (!retval && is_egl_15_or_later && _this->egl_data->eglGetProcAddress) {
retval = _this->egl_data->eglGetProcAddress(proc);
}
/* Try SDL_LoadFunction() first for EGL <= 1.4, or as a fallback for >= 1.5. */
if (!retval) {
static char procname[64];
retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, proc);
/* just in case you need an underscore prepended... */
if (!retval && (SDL_strlen(proc) < (sizeof (procname) - 1))) {
procname[0] = '_';
SDL_strlcpy(procname + 1, proc, sizeof (procname) - 1);
retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, procname);
}
}
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/* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */
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/* Try eglGetProcAddress if we on <= 1.4 and still searching... */
if (!retval && !is_egl_15_or_later && _this->egl_data->eglGetProcAddress) {
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retval = _this->egl_data->eglGetProcAddress(proc);
if (retval) {
return retval;
}
}
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return retval;
}
void
SDL_EGL_UnloadLibrary(_THIS)
{
if (_this->egl_data) {
if (_this->egl_data->egl_display) {
_this->egl_data->eglTerminate(_this->egl_data->egl_display);
_this->egl_data->egl_display = NULL;
}
if (_this->egl_data->dll_handle) {
SDL_UnloadObject(_this->egl_data->dll_handle);
_this->egl_data->dll_handle = NULL;
}
if (_this->egl_data->egl_dll_handle) {
SDL_UnloadObject(_this->egl_data->egl_dll_handle);
_this->egl_data->egl_dll_handle = NULL;
}
SDL_free(_this->egl_data);
_this->egl_data = NULL;
}
}
int
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SDL_EGL_LoadLibraryOnly(_THIS, const char *egl_path)
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{
void *dll_handle = NULL, *egl_dll_handle = NULL; /* The naming is counter intuitive, but hey, I just work here -- Gabriel */
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const char *path = NULL;
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#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
const char *d3dcompiler;
#endif
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#if SDL_VIDEO_DRIVER_RPI
SDL_bool vc4 = (0 == access("/sys/module/vc4/", F_OK));
#endif
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if (_this->egl_data) {
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return SDL_SetError("EGL context already created");
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}
_this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
if (!_this->egl_data) {
return SDL_OutOfMemory();
}
#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);
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if (d3dcompiler) {
if (SDL_strcasecmp(d3dcompiler, "none") != 0) {
if (SDL_LoadObject(d3dcompiler) == NULL) {
SDL_ClearError();
}
}
} else {
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if (WIN_IsWindowsVistaOrGreater()) {
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/* Try the newer d3d compilers first */
const char *d3dcompiler_list[] = {
"d3dcompiler_47.dll", "d3dcompiler_46.dll",
};
int i;
for (i = 0; i < SDL_arraysize(d3dcompiler_list); ++i) {
if (SDL_LoadObject(d3dcompiler_list[i]) != NULL) {
break;
}
SDL_ClearError();
}
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if (SDL_LoadObject("d3dcompiler_43.dll") == NULL) {
SDL_ClearError();
}
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#ifndef SDL_VIDEO_STATIC_ANGLE
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/* A funny thing, loading EGL.so first does not work on the Raspberry, so we load libGL* first */
path = SDL_getenv("SDL_VIDEO_GL_DRIVER");
if (path != NULL) {
egl_dll_handle = SDL_LoadObject(path);
}
if (egl_dll_handle == NULL) {
if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
if (_this->gl_config.major_version > 1) {
path = DEFAULT_OGL_ES2;
egl_dll_handle = SDL_LoadObject(path);
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#ifdef ALT_OGL_ES2
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if (egl_dll_handle == NULL && !vc4) {
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path = ALT_OGL_ES2;
egl_dll_handle = SDL_LoadObject(path);
}
#endif
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} else {
path = DEFAULT_OGL_ES;
egl_dll_handle = SDL_LoadObject(path);
if (egl_dll_handle == NULL) {
path = DEFAULT_OGL_ES_PVR;
egl_dll_handle = SDL_LoadObject(path);
}
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#ifdef ALT_OGL_ES2
if (egl_dll_handle == NULL && !vc4) {
path = ALT_OGL_ES2;
egl_dll_handle = SDL_LoadObject(path);
}
#endif
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}
}
#ifdef DEFAULT_OGL
else {
path = DEFAULT_OGL;
egl_dll_handle = SDL_LoadObject(path);
}
#endif
}
_this->egl_data->egl_dll_handle = egl_dll_handle;
if (egl_dll_handle == NULL) {
return SDL_SetError("Could not initialize OpenGL / GLES library");
}
/* Loading libGL* in the previous step took care of loading libEGL.so, but we future proof by double checking */
if (egl_path != NULL) {
dll_handle = SDL_LoadObject(egl_path);
}
/* Try loading a EGL symbol, if it does not work try the default library paths */
if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {
if (dll_handle != NULL) {
SDL_UnloadObject(dll_handle);
}
path = SDL_getenv("SDL_VIDEO_EGL_DRIVER");
if (path == NULL) {
path = DEFAULT_EGL;
}
dll_handle = SDL_LoadObject(path);
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#ifdef ALT_EGL
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if (dll_handle == NULL && !vc4) {
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path = ALT_EGL;
dll_handle = SDL_LoadObject(path);
}
#endif
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if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {
if (dll_handle != NULL) {
SDL_UnloadObject(dll_handle);
}
return SDL_SetError("Could not load EGL library");
}
SDL_ClearError();
}
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_this->egl_data->dll_handle = dll_handle;
/* Load new function pointers */
LOAD_FUNC(eglGetDisplay);
LOAD_FUNC(eglInitialize);
LOAD_FUNC(eglTerminate);
LOAD_FUNC(eglGetProcAddress);
LOAD_FUNC(eglChooseConfig);
LOAD_FUNC(eglGetConfigAttrib);
LOAD_FUNC(eglCreateContext);
LOAD_FUNC(eglDestroyContext);
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LOAD_FUNC(eglCreatePbufferSurface);
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LOAD_FUNC(eglCreateWindowSurface);
LOAD_FUNC(eglDestroySurface);
LOAD_FUNC(eglMakeCurrent);
LOAD_FUNC(eglSwapBuffers);
LOAD_FUNC(eglSwapInterval);
LOAD_FUNC(eglWaitNative);
LOAD_FUNC(eglWaitGL);
LOAD_FUNC(eglBindAPI);
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LOAD_FUNC(eglQueryAPI);
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LOAD_FUNC(eglQueryString);
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LOAD_FUNC(eglGetError);
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LOAD_FUNC_EGLEXT(eglQueryDevicesEXT);
LOAD_FUNC_EGLEXT(eglGetPlatformDisplayEXT);
_this->gl_config.driver_loaded = 1;
if (path) {
SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
} else {
*_this->gl_config.driver_path = '\0';
}
return 0;
}
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static void
SDL_EGL_GetVersion(_THIS) {
if (_this->egl_data->eglQueryString) {
const char *egl_version = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_VERSION);
if (egl_version) {
int major = 0, minor = 0;
if (SDL_sscanf(egl_version, "%d.%d", &major, &minor) == 2) {
_this->egl_data->egl_version_major = major;
_this->egl_data->egl_version_minor = minor;
} else {
SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not parse EGL version string: %s", egl_version);
}
}
}
}
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int
SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_display, EGLenum platform)
{
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int egl_version_major, egl_version_minor;
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int library_load_retcode = SDL_EGL_LoadLibraryOnly(_this, egl_path);
if (library_load_retcode != 0) {
return library_load_retcode;
}
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/* EGL 1.5 allows querying for client version with EGL_NO_DISPLAY */
SDL_EGL_GetVersion(_this);
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egl_version_major = _this->egl_data->egl_version_major;
egl_version_minor = _this->egl_data->egl_version_minor;
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if (egl_version_major == 1 && egl_version_minor == 5) {
LOAD_FUNC(eglGetPlatformDisplay);
}
_this->egl_data->egl_display = EGL_NO_DISPLAY;
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#if !defined(__WINRT__)
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if (platform) {
if (egl_version_major == 1 && egl_version_minor == 5) {
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_this->egl_data->egl_display = _this->egl_data->eglGetPlatformDisplay(platform, (void *)(size_t)native_display, NULL);
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} else {
if (SDL_EGL_HasExtension(_this, SDL_EGL_CLIENT_EXTENSION, "EGL_EXT_platform_base")) {
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_this->egl_data->eglGetPlatformDisplayEXT = SDL_EGL_GetProcAddress(_this, "eglGetPlatformDisplayEXT");
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if (_this->egl_data->eglGetPlatformDisplayEXT) {
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_this->egl_data->egl_display = _this->egl_data->eglGetPlatformDisplayEXT(platform, (void *)(size_t)native_display, NULL);
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}
}
}
}
/* Try the implementation-specific eglGetDisplay even if eglGetPlatformDisplay fails */
if (_this->egl_data->egl_display == EGL_NO_DISPLAY) {
_this->egl_data->egl_display = _this->egl_data->eglGetDisplay(native_display);
}
if (_this->egl_data->egl_display == EGL_NO_DISPLAY) {
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_this->gl_config.driver_loaded = 0;
*_this->gl_config.driver_path = '\0';
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return SDL_SetError("Could not get EGL display");
}
if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
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_this->gl_config.driver_loaded = 0;
*_this->gl_config.driver_path = '\0';
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return SDL_SetError("Could not initialize EGL");
}
#endif
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/* Get the EGL version with a valid egl_display, for EGL <= 1.4 */
SDL_EGL_GetVersion(_this);
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_this->egl_data->is_offscreen = 0;
return 0;
}
/**
On multi GPU machines EGL device 0 is not always the first valid GPU.
Container environments can restrict access to some GPUs that are still listed in the EGL
device list. If the requested device is a restricted GPU and cannot be used
(eglInitialize() will fail) then attempt to automatically and silently select the next
valid available GPU for EGL to use.
*/
int
SDL_EGL_InitializeOffscreen(_THIS, int device)
{
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void *egl_devices[SDL_EGL_MAX_DEVICES];
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EGLint num_egl_devices = 0;
const char *egl_device_hint;
if (_this->gl_config.driver_loaded != 1) {
return SDL_SetError("SDL_EGL_LoadLibraryOnly() has not been called or has failed.");
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/* Check for all extensions that are optional until used and fail if any is missing */
if (_this->egl_data->eglQueryDevicesEXT == NULL) {
return SDL_SetError("eglQueryDevicesEXT is missing (EXT_device_enumeration not supported by the drivers?)");
}
if (_this->egl_data->eglGetPlatformDisplayEXT == NULL) {
return SDL_SetError("eglGetPlatformDisplayEXT is missing (EXT_platform_base not supported by the drivers?)");
}
if (_this->egl_data->eglQueryDevicesEXT(SDL_EGL_MAX_DEVICES, egl_devices, &num_egl_devices) != EGL_TRUE) {
return SDL_SetError("eglQueryDevicesEXT() failed");
}
egl_device_hint = SDL_GetHint("SDL_HINT_EGL_DEVICE");
if (egl_device_hint) {
device = SDL_atoi(egl_device_hint);
if (device >= num_egl_devices) {
return SDL_SetError("Invalid EGL device is requested.");
}
_this->egl_data->egl_display = _this->egl_data->eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT, egl_devices[device], NULL);
if (_this->egl_data->egl_display == EGL_NO_DISPLAY) {
return SDL_SetError("eglGetPlatformDisplayEXT() failed.");
}
if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
return SDL_SetError("Could not initialize EGL");
}
}
else {
int i;
SDL_bool found = SDL_FALSE;
EGLDisplay attempted_egl_display;
/* If no hint is provided lets look for the first device/display that will allow us to eglInit */
for (i = 0; i < num_egl_devices; i++) {
attempted_egl_display = _this->egl_data->eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT, egl_devices[i], NULL);
if (attempted_egl_display == EGL_NO_DISPLAY) {
continue;
}
if (_this->egl_data->eglInitialize(attempted_egl_display, NULL, NULL) != EGL_TRUE) {
_this->egl_data->eglTerminate(attempted_egl_display);
continue;
}
/* We did not fail, we'll pick this one! */
_this->egl_data->egl_display = attempted_egl_display;
found = SDL_TRUE;
break;
}
if (!found) {
return SDL_SetError("Could not find a valid EGL device to initialize");
}
}
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/* Get the EGL version with a valid egl_display, for EGL <= 1.4 */
SDL_EGL_GetVersion(_this);
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_this->egl_data->is_offscreen = 1;
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return 0;
}
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void
SDL_EGL_SetRequiredVisualId(_THIS, int visual_id)
{
_this->egl_data->egl_required_visual_id=visual_id;
}
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#ifdef DUMP_EGL_CONFIG
#define ATTRIBUTE(_attr) { _attr, #_attr }
typedef struct {
EGLint attribute;
char const* name;
} Attribute;
Attribute attributes[] = {
ATTRIBUTE( EGL_BUFFER_SIZE ),
ATTRIBUTE( EGL_ALPHA_SIZE ),
ATTRIBUTE( EGL_BLUE_SIZE ),
ATTRIBUTE( EGL_GREEN_SIZE ),
ATTRIBUTE( EGL_RED_SIZE ),
ATTRIBUTE( EGL_DEPTH_SIZE ),
ATTRIBUTE( EGL_STENCIL_SIZE ),
ATTRIBUTE( EGL_CONFIG_CAVEAT ),
ATTRIBUTE( EGL_CONFIG_ID ),
ATTRIBUTE( EGL_LEVEL ),
ATTRIBUTE( EGL_MAX_PBUFFER_HEIGHT ),
ATTRIBUTE( EGL_MAX_PBUFFER_WIDTH ),
ATTRIBUTE( EGL_MAX_PBUFFER_PIXELS ),
ATTRIBUTE( EGL_NATIVE_RENDERABLE ),
ATTRIBUTE( EGL_NATIVE_VISUAL_ID ),
ATTRIBUTE( EGL_NATIVE_VISUAL_TYPE ),
ATTRIBUTE( EGL_SAMPLES ),
ATTRIBUTE( EGL_SAMPLE_BUFFERS ),
ATTRIBUTE( EGL_SURFACE_TYPE ),
ATTRIBUTE( EGL_TRANSPARENT_TYPE ),
ATTRIBUTE( EGL_TRANSPARENT_BLUE_VALUE ),
ATTRIBUTE( EGL_TRANSPARENT_GREEN_VALUE ),
ATTRIBUTE( EGL_TRANSPARENT_RED_VALUE ),
ATTRIBUTE( EGL_BIND_TO_TEXTURE_RGB ),
ATTRIBUTE( EGL_BIND_TO_TEXTURE_RGBA ),
ATTRIBUTE( EGL_MIN_SWAP_INTERVAL ),
ATTRIBUTE( EGL_MAX_SWAP_INTERVAL ),
ATTRIBUTE( EGL_LUMINANCE_SIZE ),
ATTRIBUTE( EGL_ALPHA_MASK_SIZE ),
ATTRIBUTE( EGL_COLOR_BUFFER_TYPE ),
ATTRIBUTE( EGL_RENDERABLE_TYPE ),
ATTRIBUTE( EGL_MATCH_NATIVE_PIXMAP ),
ATTRIBUTE( EGL_CONFORMANT ),
};
static void dumpconfig(_THIS, EGLConfig config)
{
int attr;
for (attr = 0 ; attr<sizeof(attributes)/sizeof(Attribute) ; attr++) {
EGLint value;
_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, config, attributes[attr].attribute, &value);
SDL_Log("\t%-32s: %10d (0x%08x)\n", attributes[attr].name, value, value);
}
}
#endif /* DUMP_EGL_CONFIG */
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int
SDL_EGL_ChooseConfig(_THIS)
{
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/* 64 seems nice. */
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EGLint attribs[64];
EGLint found_configs = 0, value;
/* 128 seems even nicer here */
EGLConfig configs[128];
int i, j, best_bitdiff = -1, bitdiff;
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if (!_this->egl_data) {
/* The EGL library wasn't loaded, SDL_GetError() should have info */
return -1;
}
/* Get a valid EGL configuration */
i = 0;
attribs[i++] = EGL_RED_SIZE;
attribs[i++] = _this->gl_config.red_size;
attribs[i++] = EGL_GREEN_SIZE;
attribs[i++] = _this->gl_config.green_size;
attribs[i++] = EGL_BLUE_SIZE;
attribs[i++] = _this->gl_config.blue_size;
if (_this->gl_config.alpha_size) {
attribs[i++] = EGL_ALPHA_SIZE;
attribs[i++] = _this->gl_config.alpha_size;
}
if (_this->gl_config.buffer_size) {
attribs[i++] = EGL_BUFFER_SIZE;
attribs[i++] = _this->gl_config.buffer_size;
}
attribs[i++] = EGL_DEPTH_SIZE;
attribs[i++] = _this->gl_config.depth_size;
if (_this->gl_config.stencil_size) {
attribs[i++] = EGL_STENCIL_SIZE;
attribs[i++] = _this->gl_config.stencil_size;
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = EGL_SAMPLE_BUFFERS;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = EGL_SAMPLES;
attribs[i++] = _this->gl_config.multisamplesamples;
}
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if (_this->egl_data->is_offscreen) {
attribs[i++] = EGL_SURFACE_TYPE;
attribs[i++] = EGL_PBUFFER_BIT;
}
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attribs[i++] = EGL_RENDERABLE_TYPE;
if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
#ifdef EGL_KHR_create_context
if (_this->gl_config.major_version >= 3 &&
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SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_create_context")) {
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attribs[i++] = EGL_OPENGL_ES3_BIT_KHR;
} else
#endif
if (_this->gl_config.major_version >= 2) {
attribs[i++] = EGL_OPENGL_ES2_BIT;
} else {
attribs[i++] = EGL_OPENGL_ES_BIT;
}
_this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);
} else {
attribs[i++] = EGL_OPENGL_BIT;
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
}
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if (_this->egl_data->egl_surfacetype) {
attribs[i++] = EGL_SURFACE_TYPE;
attribs[i++] = _this->egl_data->egl_surfacetype;
}
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attribs[i++] = EGL_NONE;
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if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,
attribs,
configs, SDL_arraysize(configs),
&found_configs) == EGL_FALSE ||
found_configs == 0) {
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return SDL_EGL_SetError("Couldn't find matching EGL config", "eglChooseConfig");
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/* eglChooseConfig returns a number of configurations that match or exceed the requested attribs. */
/* From those, we select the one that matches our requirements more closely via a makeshift algorithm */
for (i = 0; i < found_configs; i++ ) {
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if (_this->egl_data->egl_required_visual_id)
{
EGLint format;
_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,
configs[i],
EGL_NATIVE_VISUAL_ID, &format);
if (_this->egl_data->egl_required_visual_id != format)
continue;
}
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bitdiff = 0;
for (j = 0; j < SDL_arraysize(attribs) - 1; j += 2) {
if (attribs[j] == EGL_NONE) {
break;
}
if ( attribs[j+1] != EGL_DONT_CARE && (
attribs[j] == EGL_RED_SIZE ||
attribs[j] == EGL_GREEN_SIZE ||
attribs[j] == EGL_BLUE_SIZE ||
attribs[j] == EGL_ALPHA_SIZE ||
attribs[j] == EGL_DEPTH_SIZE ||
attribs[j] == EGL_STENCIL_SIZE)) {
_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], attribs[j], &value);
bitdiff += value - attribs[j + 1]; /* value is always >= attrib */
}
}
if (bitdiff < best_bitdiff || best_bitdiff == -1) {
_this->egl_data->egl_config = configs[i];
best_bitdiff = bitdiff;
}
if (bitdiff == 0) {
break; /* we found an exact match! */
}
}
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#ifdef DUMP_EGL_CONFIG
dumpconfig(_this, _this->egl_data->egl_config);
#endif
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return 0;
}
SDL_GLContext
SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
{
/* max 14 values plus terminator. */
EGLint attribs[15];
int attr = 0;
EGLContext egl_context, share_context = EGL_NO_CONTEXT;
EGLint profile_mask = _this->gl_config.profile_mask;
EGLint major_version = _this->gl_config.major_version;
EGLint minor_version = _this->gl_config.minor_version;
SDL_bool profile_es = (profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
if (!_this->egl_data) {
/* The EGL library wasn't loaded, SDL_GetError() should have info */
return NULL;
}
if (_this->gl_config.share_with_current_context) {
share_context = (EGLContext)SDL_GL_GetCurrentContext();
}
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#if SDL_VIDEO_DRIVER_ANDROID
if ((_this->gl_config.flags & SDL_GL_CONTEXT_DEBUG_FLAG) != 0) {
/* If SDL_GL_CONTEXT_DEBUG_FLAG is set but EGL_KHR_debug unsupported, unset.
* This is required because some Android devices like to complain about it
* by "silently" failing, logging a hint which could be easily overlooked:
* E/libEGL (26984): validate_display:255 error 3008 (EGL_BAD_DISPLAY)
* The following explicitly checks for EGL_KHR_debug before EGL 1.5
*/
int egl_version_major = _this->egl_data->egl_version_major;
int egl_version_minor = _this->egl_data->egl_version_minor;
if (((egl_version_major < 1) || (egl_version_major == 1 && egl_version_minor < 5)) &&
!SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_debug")) {
/* SDL profile bits match EGL profile bits. */
_this->gl_config.flags &= ~SDL_GL_CONTEXT_DEBUG_FLAG;
}
}
#endif
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/* Set the context version and other attributes. */
if ((major_version < 3 || (minor_version == 0 && profile_es)) &&
_this->gl_config.flags == 0 &&
(profile_mask == 0 || profile_es)) {
/* Create a context without using EGL_KHR_create_context attribs.
* When creating a GLES context without EGL_KHR_create_context we can
* only specify the major version. When creating a desktop GL context
* we can't specify any version, so we only try in that case when the
* version is less than 3.0 (matches SDL's GLX/WGL behavior.)
*/
if (profile_es) {
attribs[attr++] = EGL_CONTEXT_CLIENT_VERSION;
attribs[attr++] = SDL_max(major_version, 1);
}
} else {
#ifdef EGL_KHR_create_context
/* The Major/minor version, context profiles, and context flags can
* only be specified when this extension is available.
*/
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if (SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_create_context")) {
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attribs[attr++] = EGL_CONTEXT_MAJOR_VERSION_KHR;
attribs[attr++] = major_version;
attribs[attr++] = EGL_CONTEXT_MINOR_VERSION_KHR;
attribs[attr++] = minor_version;
/* SDL profile bits match EGL profile bits. */
if (profile_mask != 0 && profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
attribs[attr++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
attribs[attr++] = profile_mask;
}
/* SDL flags match EGL flags. */
if (_this->gl_config.flags != 0) {
attribs[attr++] = EGL_CONTEXT_FLAGS_KHR;
attribs[attr++] = _this->gl_config.flags;
}
} else
#endif /* EGL_KHR_create_context */
{
SDL_SetError("Could not create EGL context (context attributes are not supported)");
return NULL;
}
}
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if (_this->gl_config.no_error) {
#ifdef EGL_KHR_create_context_no_error
if (SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_create_context_no_error")) {
attribs[attr++] = EGL_CONTEXT_OPENGL_NO_ERROR_KHR;
attribs[attr++] = _this->gl_config.no_error;
} else
#endif
{
SDL_SetError("EGL implementation does not support no_error contexts");
return NULL;
}
}
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attribs[attr++] = EGL_NONE;
/* Bind the API */
if (profile_es) {
_this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);
} else {
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
}
egl_context = _this->egl_data->eglCreateContext(_this->egl_data->egl_display,
_this->egl_data->egl_config,
share_context, attribs);
if (egl_context == EGL_NO_CONTEXT) {
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SDL_EGL_SetError("Could not create EGL context", "eglCreateContext");
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return NULL;
}
_this->egl_data->egl_swapinterval = 0;
if (SDL_EGL_MakeCurrent(_this, egl_surface, egl_context) < 0) {
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/* Save the SDL error set by SDL_EGL_MakeCurrent */
char errorText[1024];
SDL_strlcpy(errorText, SDL_GetError(), SDL_arraysize(errorText));
/* Delete the context, which may alter the value returned by SDL_GetError() */
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SDL_EGL_DeleteContext(_this, egl_context);
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/* Restore the SDL error */
SDL_SetError("%s", errorText);
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return NULL;
}
return (SDL_GLContext) egl_context;
}
int
SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)
{
EGLContext egl_context = (EGLContext) context;
if (!_this->egl_data) {
return SDL_SetError("OpenGL not initialized");
}
/* The android emulator crashes badly if you try to eglMakeCurrent
* with a valid context and invalid surface, so we have to check for both here.
*/
if (!egl_context || !egl_surface) {
_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
} else {
if (!_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display,
egl_surface, egl_surface, egl_context)) {
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return SDL_EGL_SetError("Unable to make EGL context current", "eglMakeCurrent");
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}
}
return 0;
}
int
SDL_EGL_SetSwapInterval(_THIS, int interval)
{
EGLBoolean status;
if (!_this->egl_data) {
return SDL_SetError("EGL not initialized");
}
status = _this->egl_data->eglSwapInterval(_this->egl_data->egl_display, interval);
if (status == EGL_TRUE) {
_this->egl_data->egl_swapinterval = interval;
return 0;
}
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return SDL_EGL_SetError("Unable to set the EGL swap interval", "eglSwapInterval");
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}
int
SDL_EGL_GetSwapInterval(_THIS)
{
if (!_this->egl_data) {
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SDL_SetError("EGL not initialized");
return 0;
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}
return _this->egl_data->egl_swapinterval;