/*

* Simple DirectMedia Layer

* Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>

*

* 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

#if SDL_VIDEO_DRIVER_ANDROID

#include <android/native_window.h>

#endif

#include "SDL_sysvideo.h"

#include "SDL_log.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 */

#if 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 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"

#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" //???

#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 */

#ifdef SDL_VIDEO_STATIC_ANGLE

#define LOAD_FUNC(NAME) \

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

#else

#define LOAD_FUNC(NAME) \

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

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

{ \

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

}

#endif

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);

}

/* EGL implementation of SDL OpenGL ES support */

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)

{

size_t ext_len;

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;

}

}

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 != NULL) {

ext_start = egl_extstr;

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;

}

}

/* 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)

{

static char procname[1024];

void *retval;

/* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */

#if !defined(SDL_VIDEO_DRIVER_ANDROID)

if (_this->egl_data->eglGetProcAddress) {

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

if (retval) {

return retval;

}

}

#endif

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

if (!retval && SDL_strlen(proc) <= 1022) {

procname[0] = '_';

SDL_strlcpy(procname + 1, proc, 1022);

retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, procname);

}

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

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

{

void *dll_handle = NULL, *egl_dll_handle = NULL; /* The naming is counter intuitive, but hey, I just work here -- Gabriel */

const char *path = NULL;

int egl_version_major = 0, egl_version_minor = 0;

#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

const char *d3dcompiler;

#endif

#if SDL_VIDEO_DRIVER_RPI

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

#endif

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_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);

if (!d3dcompiler) {

if (WIN_IsWindowsVistaOrGreater()) {

d3dcompiler = "d3dcompiler_46.dll";

} else {

d3dcompiler = "d3dcompiler_43.dll";

}

}

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

if (SDL_LoadObject(d3dcompiler) == NULL) {

SDL_ClearError();

}

}

#endif

#ifndef SDL_VIDEO_STATIC_ANGLE

/* 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);

#ifdef ALT_OGL_ES2

if (egl_dll_handle == NULL && !vc4) {

path = ALT_OGL_ES2;

egl_dll_handle = SDL_LoadObject(path);

}

#endif

} 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);

}

#ifdef ALT_OGL_ES2

if (egl_dll_handle == NULL && !vc4) {

path = ALT_OGL_ES2;

egl_dll_handle = SDL_LoadObject(path);

}

#endif

}

}

#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);

#ifdef ALT_EGL

if (dll_handle == NULL && !vc4) {

path = ALT_EGL;

dll_handle = SDL_LoadObject(path);

}

#endif

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();

}

#endif

_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);

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(eglQueryString);

LOAD_FUNC(eglGetError);

if (_this->egl_data->eglQueryString) {

/* EGL 1.5 allows querying for client version */

const char *egl_version = _this->egl_data->eglQueryString(EGL_NO_DISPLAY, EGL_VERSION);

if (egl_version != NULL) {

if (SDL_sscanf(egl_version, "%d.%d", &egl_version_major, &egl_version_minor) != 2) {

egl_version_major = 0;

egl_version_minor = 0;

SDL_LogWarn(SDL_LOG_CATEGORY_VIDEO, "Could not parse EGL version string: %s", egl_version);

}

}

}

_this->egl_data->egl_version_major = egl_version_major;

_this->egl_data->egl_version_minor = egl_version_minor;

if (egl_version_major == 1 && egl_version_minor == 5) {

LOAD_FUNC(eglGetPlatformDisplay);

}

_this->egl_data->egl_display = EGL_NO_DISPLAY;

#if !defined(__WINRT__)

if (platform) {

if (egl_version_major == 1 && egl_version_minor == 5) {

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

}

}

}

}

/* 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) {

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

}

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

return SDL_SetError("Could not initialize EGL");

}

#endif

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;

}

#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 */

int

SDL_EGL_ChooseConfig(_THIS)

{

/* 64 seems nice. */

EGLint attribs[64];

EGLint found_configs = 0, value;

#ifdef SDL_VIDEO_DRIVER_KMSDRM

/* Intel EGL on KMS/DRM (al least) returns invalid configs that confuse the bitdiff search used */

/* later in this function, so we simply use the first one when using the KMSDRM driver for now. */

EGLConfig configs[1];

#else

/* 128 seems even nicer here */

EGLConfig configs[128];

#endif

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

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;

}

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;

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

attribs,

configs, SDL_arraysize(configs),

&found_configs) == EGL_FALSE ||

found_configs == 0) {

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

}

/* 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++ ) {

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! */

}

}

#ifdef DUMP_EGL_CONFIG

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

#endif

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();

}

#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

/* 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. */

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;

}

}

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;

}

}

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) {

SDL_EGL_SetError("Could not create EGL context", "eglCreateContext");

return NULL;

}

_this->egl_data->egl_swapinterval = 0;

if (SDL_EGL_MakeCurrent(_this, egl_surface, egl_context) < 0) {

/* 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() */

SDL_EGL_DeleteContext(_this, egl_context);

/* Restore the SDL error */

SDL_SetError("%s", errorText);

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)) {

return SDL_EGL_SetError("Unable to make EGL context current", "eglMakeCurrent");

}

}

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;

}

return SDL_EGL_SetError("Unable to set the EGL swap interval", "eglSwapInterval");

}

int

SDL_EGL_GetSwapInterval(_THIS)

{

if (!_this->egl_data) {

SDL_SetError("EGL not initialized");

return 0;

}

return _this->egl_data->egl_swapinterval;

}

int

SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)

{

if (!_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, egl_surface)) {

return SDL_EGL_SetError("unable to show color buffer in an OS-native window", "eglSwapBuffers");

}

return 0;

}

void

SDL_EGL_DeleteContext(_THIS, SDL_GLContext context)

{

EGLContext egl_context = (EGLContext) context;

/* Clean up GLES and EGL */

if (!_this->egl_data) {

return;

}

if (egl_context != NULL && egl_context != EGL_NO_CONTEXT) {

_this->egl_data->eglDestroyContext(_this->egl_data->egl_display, egl_context);

}

}

EGLSurface *

SDL_EGL_CreateSurface(_THIS, NativeWindowType nw)

{

/* max 2 values plus terminator. */

EGLint attribs[3];

int attr = 0;

EGLSurface * surface;

if (SDL_EGL_ChooseConfig(_this) != 0) {

return EGL_NO_SURFACE;

}

#if SDL_VIDEO_DRIVER_ANDROID

{

/* Android docs recommend doing this!

* Ref: http://developer.android.com/reference/android/app/NativeActivity.html

*/

EGLint format;

_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,

_this->egl_data->egl_config,

EGL_NATIVE_VISUAL_ID, &format);

ANativeWindow_setBuffersGeometry(nw, 0, 0, format);

}

#endif

if (_this->gl_config.framebuffer_srgb_capable) {

#ifdef EGL_KHR_gl_colorspace

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

attribs[attr++] = EGL_GL_COLORSPACE_KHR;

attribs[attr++] = EGL_GL_COLORSPACE_SRGB_KHR;

} else

#endif

{

SDL_SetError("EGL implementation does not support sRGB system framebuffers");

return EGL_NO_SURFACE;

}

}

attribs[attr++] = EGL_NONE;

surface = _this->egl_data->eglCreateWindowSurface(

_this->egl_data->egl_display,

_this->egl_data->egl_config,

nw, &attribs[0]);

if (surface == EGL_NO_SURFACE) {

SDL_EGL_SetError("unable to create an EGL window surface", "eglCreateWindowSurface");

}

return surface;

}

void

SDL_EGL_DestroySurface(_THIS, EGLSurface egl_surface)

{

if (!_this->egl_data) {

return;

}

if (egl_surface != EGL_NO_SURFACE) {

_this->egl_data->eglDestroySurface(_this->egl_data->egl_display, egl_surface);

}

}

#endif /* SDL_VIDEO_OPENGL_EGL */

/* vi: set ts=4 sw=4 expandtab: */