SDL/src/video/SDL_egl.c at SDL2 · zaucy/SDL

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* Simple DirectMedia Layer

* 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"

#ifdef SDL_VIDEO_OPENGL_EGL

#if defined(SDL_VIDEO_DRIVER_WINDOWS) || defined(SDL_VIDEO_DRIVER_WINRT)

#include "../core/windows/SDL_windows.h"

#endif

#ifdef SDL_VIDEO_DRIVER_ANDROID

#include <android/native_window.h>

#include "../video/android/SDL_androidvideo.h"

#endif

#ifdef SDL_VIDEO_DRIVER_RPI

#include <unistd.h>

#endif

#include "SDL_sysvideo.h"

#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 */

#ifndef EGL_EXT_pixel_format_float

#define EGL_EXT_pixel_format_float

#define EGL_COLOR_COMPONENT_TYPE_EXT 0x3339

#define EGL_COLOR_COMPONENT_TYPE_FIXED_EXT 0x333A

#define EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT 0x333B

#endif

#ifndef EGL_EXT_present_opaque

#define EGL_EXT_present_opaque 1

#define EGL_PRESENT_OPAQUE_EXT 0x31DF

#endif /* EGL_EXT_present_opaque */

#ifdef SDL_VIDEO_DRIVER_RPI

/* Raspbian places the OpenGL ES/EGL binaries in a non standard path */

#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")

#elif defined(SDL_VIDEO_DRIVER_ANDROID) || defined(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 defined(SDL_VIDEO_DRIVER_WINDOWS) || defined(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"

#elif defined(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" //???

#elif defined(__OpenBSD__)

/* OpenBSD */

#define DEFAULT_OGL "libGL.so"

#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"

#else

/* Desktop Linux/Unix-like */

#define DEFAULT_OGL "libGL.so.1"

#define DEFAULT_EGL "libEGL.so.1"

#define ALT_OGL "libOpenGL.so.0"

#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 */

#if defined(SDL_VIDEO_OPENGL) && !defined(SDL_VIDEO_VITA_PVR_OGL)

#include "SDL_opengl.h"

#endif

/** 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

#if defined(SDL_VIDEO_STATIC_ANGLE) || defined(SDL_VIDEO_DRIVER_VITA)

#define LOAD_FUNC(NAME) \

_this->egl_data->NAME = (void *)NAME;

#else

#define LOAD_FUNC(NAME) \

_this->egl_data->NAME = SDL_LoadFunction(_this->egl_data->egl_dll_handle, #NAME); \

if (!_this->egl_data->NAME) { \

return SDL_SetError("Could not retrieve EGL function " #NAME); \

}

#endif

/* 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);

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. */

(void)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);

}

/* EGL implementation of SDL OpenGL ES support */

SDL_bool SDL_EGL_HasExtension(_THIS, SDL_EGL_ExtensionType type, const char *ext)

{

size_t ext_len;

const char *ext_override;

const char *egl_extstr;

const char *ext_start;

/* Invalid extensions can be rejected early */

if (!ext || *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) {

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;

}

ext_len = SDL_strlen(ext);

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;

}

if (egl_extstr) {

ext_start = egl_extstr;

while (*ext_start) {

ext_start = SDL_strstr(ext_start, ext);

if (!ext_start) {

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;

}

/* 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++;

}

return SDL_FALSE;

}

void *SDL_EGL_GetProcAddress(_THIS, const char *proc)

{

void *retval = NULL;

if (_this->egl_data) {

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);

/* 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);

}

#if !defined(__EMSCRIPTEN__) && !defined(SDL_VIDEO_DRIVER_VITA) /* LoadFunction isn't needed on Emscripten and will call dlsym(), causing other problems. */

/* Try SDL_LoadFunction() first for EGL <= 1.4, or as a fallback for >= 1.5. */

if (!retval) {

retval = SDL_LoadFunction(_this->egl_data->opengl_dll_handle, proc);

}

#endif

/* Try eglGetProcAddress if we're on <= 1.4 and still searching... */

if (!retval && !is_egl_15_or_later && _this->egl_data->eglGetProcAddress) {

retval = _this->egl_data->eglGetProcAddress(proc);

}

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->egl_dll_handle) {

SDL_UnloadObject(_this->egl_data->egl_dll_handle);

_this->egl_data->egl_dll_handle = NULL;

}

if (_this->egl_data->opengl_dll_handle) {

SDL_UnloadObject(_this->egl_data->opengl_dll_handle);

_this->egl_data->opengl_dll_handle = NULL;

}

SDL_free(_this->egl_data);

_this->egl_data = NULL;

}

static int SDL_EGL_LoadLibraryInternal(_THIS, const char *egl_path)

{

void *egl_dll_handle = NULL, *opengl_dll_handle = NULL;

const char *path = NULL;

#if defined(SDL_VIDEO_DRIVER_WINDOWS) || defined(SDL_VIDEO_DRIVER_WINRT)

const char *d3dcompiler;

#endif

#ifdef SDL_VIDEO_DRIVER_RPI

SDL_bool vc4 = (0 == access("/sys/module/vc4/", F_OK));

#endif

#if defined(SDL_VIDEO_DRIVER_WINDOWS) || defined(SDL_VIDEO_DRIVER_WINRT)

d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);

if (d3dcompiler) {

if (SDL_strcasecmp(d3dcompiler, "none") != 0) {

if (SDL_LoadObject(d3dcompiler) == NULL) {

SDL_ClearError();

}

} else {

if (WIN_IsWindowsVistaOrGreater()) {

/* 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();

}

} else {

if (SDL_LoadObject("d3dcompiler_43.dll") == NULL) {

SDL_ClearError();

}

#endif

#if !defined(SDL_VIDEO_STATIC_ANGLE) && !defined(SDL_VIDEO_DRIVER_VITA)

/* 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) {

opengl_dll_handle = SDL_LoadObject(path);

}

if (!opengl_dll_handle) {

if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {

if (_this->gl_config.major_version > 1) {

path = DEFAULT_OGL_ES2;

opengl_dll_handle = SDL_LoadObject(path);

#ifdef ALT_OGL_ES2

if (!opengl_dll_handle && !vc4) {

path = ALT_OGL_ES2;

opengl_dll_handle = SDL_LoadObject(path);

}

#endif

} else {

path = DEFAULT_OGL_ES;

opengl_dll_handle = SDL_LoadObject(path);

if (!opengl_dll_handle) {

path = DEFAULT_OGL_ES_PVR;

opengl_dll_handle = SDL_LoadObject(path);

}

#ifdef ALT_OGL_ES2

if (!opengl_dll_handle && !vc4) {

path = ALT_OGL_ES2;

opengl_dll_handle = SDL_LoadObject(path);

}

#endif

}

#ifdef DEFAULT_OGL

else {

path = DEFAULT_OGL;

opengl_dll_handle = SDL_LoadObject(path);

#ifdef ALT_OGL

if (!opengl_dll_handle) {

path = ALT_OGL;

opengl_dll_handle = SDL_LoadObject(path);

}

#endif

}

#endif

}

_this->egl_data->opengl_dll_handle = opengl_dll_handle;

if (!opengl_dll_handle) {

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) {

egl_dll_handle = SDL_LoadObject(egl_path);

}

/* Try loading a EGL symbol, if it does not work try the default library paths */

if (!egl_dll_handle || SDL_LoadFunction(egl_dll_handle, "eglChooseConfig") == NULL) {

if (egl_dll_handle) {

SDL_UnloadObject(egl_dll_handle);

}

path = SDL_getenv("SDL_VIDEO_EGL_DRIVER");

if (!path) {

path = DEFAULT_EGL;

}

egl_dll_handle = SDL_LoadObject(path);

#ifdef ALT_EGL

if (!egl_dll_handle && !vc4) {

path = ALT_EGL;

egl_dll_handle = SDL_LoadObject(path);

}

#endif

if (!egl_dll_handle || SDL_LoadFunction(egl_dll_handle, "eglChooseConfig") == NULL) {

if (egl_dll_handle) {

SDL_UnloadObject(egl_dll_handle);

}

return SDL_SetError("Could not load EGL library");

}

SDL_ClearError();

}

#endif

_this->egl_data->egl_dll_handle = egl_dll_handle;

#ifdef SDL_VIDEO_DRIVER_VITA

_this->egl_data->opengl_dll_handle = opengl_dll_handle;

#endif

/* 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);

LOAD_FUNC(eglCreatePbufferSurface);

LOAD_FUNC(eglCreateWindowSurface);

LOAD_FUNC(eglDestroySurface);

LOAD_FUNC(eglMakeCurrent);

LOAD_FUNC(eglSwapBuffers);

LOAD_FUNC(eglSwapInterval);

LOAD_FUNC(eglWaitNative);

LOAD_FUNC(eglWaitGL);

LOAD_FUNC(eglBindAPI);

LOAD_FUNC(eglQueryAPI);

LOAD_FUNC(eglQueryString);

LOAD_FUNC(eglGetError);

LOAD_FUNC_EGLEXT(eglQueryDevicesEXT);

LOAD_FUNC_EGLEXT(eglGetPlatformDisplayEXT);

/* Atomic functions */

LOAD_FUNC_EGLEXT(eglCreateSyncKHR);

LOAD_FUNC_EGLEXT(eglDestroySyncKHR);

LOAD_FUNC_EGLEXT(eglDupNativeFenceFDANDROID);

LOAD_FUNC_EGLEXT(eglWaitSyncKHR);

LOAD_FUNC_EGLEXT(eglClientWaitSyncKHR);

/* Atomic functions end */

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;

}

int SDL_EGL_LoadLibraryOnly(_THIS, const char *egl_path)

{

if (_this->egl_data) {

return SDL_SetError("EGL context already created");

}

_this->egl_data = (struct SDL_EGL_VideoData *)SDL_calloc(1, sizeof(SDL_EGL_VideoData));

if (!_this->egl_data) {

return SDL_OutOfMemory();

}

if (SDL_EGL_LoadLibraryInternal(_this, egl_path) < 0) {

SDL_free(_this->egl_data);

_this->egl_data = NULL;

return -1;

}

return 0;

}

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);

}

int SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_display, EGLenum platform)

{

int library_load_retcode = SDL_EGL_LoadLibraryOnly(_this, egl_path);

if (library_load_retcode != 0) {

return library_load_retcode;

}

_this->egl_data->egl_display = EGL_NO_DISPLAY;

#if !defined(__WINRT__)

#if !defined(SDL_VIDEO_DRIVER_VITA)

if (platform) {

/* EGL 1.5 allows querying for client version with EGL_NO_DISPLAY

* --

* Khronos doc: "EGL_BAD_DISPLAY is generated if display is not an EGL display connection, unless display is EGL_NO_DISPLAY and name is EGL_EXTENSIONS."

* Therefore SDL_EGL_GetVersion() shouldn't work with uninitialized display.

* - it actually doesn't work on Android that has 1.5 egl client

* - it works on desktop X11 (using SDL_VIDEO_X11_FORCE_EGL=1) */

SDL_EGL_GetVersion(_this);

if (_this->egl_data->egl_version_major == 1 && _this->egl_data->egl_version_minor == 5) {

LOAD_FUNC(eglGetPlatformDisplay);

}

if (_this->egl_data->eglGetPlatformDisplay) {

_this->egl_data->egl_display = _this->egl_data->eglGetPlatformDisplay(platform, (void *)(uintptr_t)native_display, NULL);

} else {

if (SDL_EGL_HasExtension(_this, SDL_EGL_CLIENT_EXTENSION, "EGL_EXT_platform_base")) {

_this->egl_data->eglGetPlatformDisplayEXT = SDL_EGL_GetProcAddress(_this, "eglGetPlatformDisplayEXT");

if (_this->egl_data->eglGetPlatformDisplayEXT) {

_this->egl_data->egl_display = _this->egl_data->eglGetPlatformDisplayEXT(platform, (void *)(uintptr_t)native_display, NULL);

}

#endif

/* Try the implementation-specific eglGetDisplay even if eglGetPlatformDisplay fails */

if ((_this->egl_data->egl_display == EGL_NO_DISPLAY) && (_this->egl_data->eglGetDisplay)) {

_this->egl_data->egl_display = _this->egl_data->eglGetDisplay(native_display);

}

if (_this->egl_data->egl_display == EGL_NO_DISPLAY) {

_this->gl_config.driver_loaded = 0;

*_this->gl_config.driver_path = '\0';

return SDL_SetError("Could not get EGL display");

}

if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {

_this->gl_config.driver_loaded = 0;

*_this->gl_config.driver_path = '\0';

return SDL_SetError("Could not initialize EGL");

}

#endif

/* Get the EGL version with a valid egl_display, for EGL <= 1.4 */

SDL_EGL_GetVersion(_this);

_this->egl_data->is_offscreen = SDL_FALSE;

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)

{

void *egl_devices[SDL_EGL_MAX_DEVICES];

EGLint num_egl_devices = 0;

const char *egl_device_hint;

if (_this->gl_config.driver_loaded <= 0) {

return SDL_SetError("SDL_EGL_LoadLibraryOnly() has not been called or has failed.");

}

/* Check for all extensions that are optional until used and fail if any is missing */

if (!_this->egl_data->eglQueryDevicesEXT) {

return SDL_SetError("eglQueryDevicesEXT is missing (EXT_device_enumeration not supported by the drivers?)");

}

if (!_this->egl_data->eglGetPlatformDisplayEXT) {

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");

}

/* Get the EGL version with a valid egl_display, for EGL <= 1.4 */

SDL_EGL_GetVersion(_this);

_this->egl_data->is_offscreen = SDL_TRUE;

return 0;

}

void SDL_EGL_SetRequiredVisualId(_THIS, int visual_id)

{

_this->egl_data->egl_required_visual_id = visual_id;

}

#ifdef DUMP_EGL_CONFIG

#define ATTRIBUTE(_attr) \

{ \

_attr, #_attr \

}

typedef struct

{

EGLint attribute;

char const *name;

} Attribute;

static Attribute all_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(all_attributes) / sizeof(Attribute); attr++) {

EGLint value;

_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, config, all_attributes[attr].attribute, &value);

SDL_Log("\t%-32s: %10d (0x%08x)\n", all_attributes[attr].name, value, value);

}

#endif /* DUMP_EGL_CONFIG */

static int SDL_EGL_PrivateChooseConfig(_THIS, SDL_bool set_config_caveat_none)

{

/* 64 seems nice. */

EGLint attribs[64];

EGLint found_configs = 0, value;

/* 128 seems even nicer here */

EGLConfig configs[128];

SDL_bool has_matching_format = SDL_FALSE;

int i, j, best_bitdiff = -1, best_truecolor_bitdiff = -1;

int truecolor_config_idx = -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 (set_config_caveat_none) {

attribs[i++] = EGL_CONFIG_CAVEAT;

attribs[i++] = EGL_NONE;

}

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;

}

if (_this->gl_config.depth_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;

}

if (_this->gl_config.floatbuffers) {

attribs[i++] = EGL_COLOR_COMPONENT_TYPE_EXT;

attribs[i++] = EGL_COLOR_COMPONENT_TYPE_FLOAT_EXT;

}

if (_this->egl_data->is_offscreen) {

attribs[i++] = EGL_SURFACE_TYPE;

attribs[i++] = EGL_PBUFFER_BIT;

}

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 &&

SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_create_context")) {

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);

}

if (_this->egl_data->egl_surfacetype) {

attribs[i++] = EGL_SURFACE_TYPE;

attribs[i++] = _this->egl_data->egl_surfacetype;

}

attribs[i++] = EGL_NONE;

SDL_assert(i < SDL_arraysize(attribs));

if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,

attribs,

configs, SDL_arraysize(configs),

&found_configs) == EGL_FALSE ||

found_configs == 0) {

return -1;

}

/* first ensure that a found config has a matching format, or the function will fall through. */

if (_this->egl_data->egl_required_visual_id) {

for (i = 0; i < found_configs; i++) {

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) {

has_matching_format = SDL_TRUE;

break;

}

/* 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++) {

SDL_bool is_truecolor = SDL_FALSE;

int bitdiff = 0;

if (has_matching_format && _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;

}

_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], EGL_RED_SIZE, &value);

if (value == 8) {

_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], EGL_GREEN_SIZE, &value);

if (value == 8) {

_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], EGL_BLUE_SIZE, &value);

if (value == 8) {

is_truecolor = SDL_TRUE;

}

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 (is_truecolor && ((bitdiff < best_truecolor_bitdiff) || (best_truecolor_bitdiff == -1))) {

truecolor_config_idx = i;

best_truecolor_bitdiff = bitdiff;

}

#define FAVOR_TRUECOLOR 1

#if FAVOR_TRUECOLOR

/* Some apps request a low color depth, either because they _assume_

they'll get a larger one but don't want to fail if only smaller ones

are available, or they just never called SDL_GL_SetAttribute at all and

got a tiny default. For these cases, a game that would otherwise run

at 24-bit color might get dithered down to something smaller, which is

worth avoiding. If the app requested <= 16 bit color and an exact 24-bit

match is available, favor that. Otherwise, we look for the closest

match. Note that while the API promises what you request _or better_,

it's feasible this can be disastrous for performance for custom software

on small hardware that all expected to actually get 16-bit color. In this

case, turn off FAVOR_TRUECOLOR (and maybe send a patch to make this more

flexible). */

if (((_this->gl_config.red_size + _this->gl_config.blue_size + _this->gl_config.green_size) <= 16)) {

if (truecolor_config_idx != -1) {

_this->egl_data->egl_config = configs[truecolor_config_idx];

}

#endif

#ifdef DUMP_EGL_CONFIG

dumpconfig(_this, _this->egl_data->egl_config);

#endif

return 0;

}

int SDL_EGL_ChooseConfig(_THIS)

{

int ret;

if (!_this->egl_data) {

return SDL_SetError("EGL not initialized");

}

/* Try with EGL_CONFIG_CAVEAT set to EGL_NONE, to avoid any EGL_SLOW_CONFIG or EGL_NON_CONFORMANT_CONFIG */

ret = SDL_EGL_PrivateChooseConfig(_this, SDL_TRUE);

if (ret == 0) {

return 0;

}

/* Fallback with all configs */

ret = SDL_EGL_PrivateChooseConfig(_this, SDL_FALSE);

if (ret == 0) {

SDL_Log("SDL_EGL_ChooseConfig: found a slow EGL config");

return 0;

}

return SDL_EGL_SetError("Couldn't find matching EGL config", "eglChooseConfig");

}

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) {

SDL_SetError("EGL not initialized");

return NULL;

}

if (_this->gl_config.share_with_current_context) {

share_context = (EGLContext)SDL_GL_GetCurrentContext();

}

#ifdef SDL_VIDEO_DRIVER_ANDROID

if (_this->gl_config.flags & SDL_GL_CONTEXT_DEBUG_FLAG) {

/* 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

/* 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.

if (SDL_EGL_HasExtension(_this, SDL_EGL_DISPLAY_EXTENSION, "EGL_KHR_create_context")) {

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. */

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