/*

* Simple DirectMedia Layer

* Copyright (C) 1997-2015 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

#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 */

#if SDL_VIDEO_DRIVER_RPI

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

#define DEFAULT_EGL "/opt/vc/lib/libEGL.so"

#define DEFAULT_OGL_ES2 "/opt/vc/lib/libGLESv2.so"

#define DEFAULT_OGL_ES_PVR "/opt/vc/lib/libGLES_CM.so"

#define DEFAULT_OGL_ES "/opt/vc/lib/libGLESv1_CM.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"

#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 */

#define LOAD_FUNC(NAME) \

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

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

{ \

SDL_EGL_UnloadLibrary(_this); \

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

}

/* EGL implementation of SDL OpenGL ES support */

#ifdef EGL_KHR_create_context

static int SDL_EGL_HasExtension(_THIS, const char *ext)

{

int i;

int len = 0;

int ext_len;

const char *exts;

const char *ext_word;

ext_len = SDL_strlen(ext);

exts = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_EXTENSIONS);

if (exts) {

ext_word = exts;

for (i = 0; exts[i] != 0; i++) {

if (exts[i] == ' ') {

if (ext_len == len && !SDL_strncmp(ext_word, ext, len)) {

return 1;

}

len = 0;

ext_word = &exts[i + 1];

} else {

len++;

}

}

}

return 0;

}

#endif /* EGL_KHR_create_context */

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) && !defined(SDL_VIDEO_DRIVER_MIR)

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)

{

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

char *path = NULL;

#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT

const char *d3dcompiler;

#endif

if (_this->egl_data) {

return SDL_SetError("OpenGL ES 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) {

SDL_LoadObject(d3dcompiler);

}

#endif

/* 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);

} 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 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) {

SDL_EGL_UnloadLibrary(_this);

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);

if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {

if (dll_handle != NULL) {

SDL_UnloadObject(dll_handle);

}

SDL_EGL_UnloadLibrary(_this);

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

}

SDL_ClearError();

}

_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(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);

#if !defined(__WINRT__)

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

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

SDL_EGL_UnloadLibrary(_this);

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

}

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

SDL_EGL_UnloadLibrary(_this);

return SDL_SetError("Could not initialize EGL");

}

#endif

_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;

}

int

SDL_EGL_ChooseConfig(_THIS)

{

/* 64 seems nice. */

EGLint attribs[64];

EGLint found_configs = 0, value;

/* 128 seems even nicer here */

EGLConfig configs[128];

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, "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);

}

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_SetError("Couldn't find matching EGL config");

}

/* 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! */

}

}

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();

}

/* 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, "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;

}

}

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_SetError("Could not create EGL context");

return NULL;

}

_this->egl_data->egl_swapinterval = 0;

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

SDL_EGL_DeleteContext(_this, egl_context);

SDL_SetError("Could not make EGL context current");

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_SetError("Unable to make EGL context current");

}

}

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_SetError("Unable to set the EGL swap interval");

}

int

SDL_EGL_GetSwapInterval(_THIS)

{

if (!_this->egl_data) {

return SDL_SetError("EGL not initialized");

}

return _this->egl_data->egl_swapinterval;

}

void

SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)

{

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

}

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) {

SDL_EGL_MakeCurrent(_this, NULL, NULL);

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

}

}

EGLSurface *

SDL_EGL_CreateSurface(_THIS, NativeWindowType nw)

{

if (SDL_EGL_ChooseConfig(_this) != 0) {

return EGL_NO_SURFACE;

}

#if __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

return _this->egl_data->eglCreateWindowSurface(

_this->egl_data->egl_display,

_this->egl_data->egl_config,

nw, NULL);

}

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: */