//========================================================================

// GLFW 3.3 EGL - www.glfw.org

//------------------------------------------------------------------------

// Copyright (c) 2002-2006 Marcus Geelnard

// Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.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 "internal.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <assert.h>

// Return a description of the specified EGL error

//

static const char* getEGLErrorString(EGLint error)

{

switch (error)

{

case EGL_SUCCESS:

return "Success";

case EGL_NOT_INITIALIZED:

return "EGL is not or could not be initialized";

case EGL_BAD_ACCESS:

return "EGL cannot access a requested resource";

case EGL_BAD_ALLOC:

return "EGL failed to allocate resources for the requested operation";

case EGL_BAD_ATTRIBUTE:

return "An unrecognized attribute or attribute value was passed in the attribute list";

case EGL_BAD_CONTEXT:

return "An EGLContext argument does not name a valid EGL rendering context";

case EGL_BAD_CONFIG:

return "An EGLConfig argument does not name a valid EGL frame buffer configuration";

case EGL_BAD_CURRENT_SURFACE:

return "The current surface of the calling thread is a window, pixel buffer or pixmap that is no longer valid";

case EGL_BAD_DISPLAY:

return "An EGLDisplay argument does not name a valid EGL display connection";

case EGL_BAD_SURFACE:

return "An EGLSurface argument does not name a valid surface configured for GL rendering";

case EGL_BAD_MATCH:

return "Arguments are inconsistent";

case EGL_BAD_PARAMETER:

return "One or more argument values are invalid";

case EGL_BAD_NATIVE_PIXMAP:

return "A NativePixmapType argument does not refer to a valid native pixmap";

case EGL_BAD_NATIVE_WINDOW:

return "A NativeWindowType argument does not refer to a valid native window";

case EGL_CONTEXT_LOST:

return "The application must destroy all contexts and reinitialise";

default:

return "ERROR: UNKNOWN EGL ERROR";

}

}

// Returns the specified attribute of the specified EGLConfig

//

static int getEGLConfigAttrib(EGLConfig config, int attrib)

{

int value;

eglGetConfigAttrib(_glfw.egl.display, config, attrib, &value);

return value;

}

// Return the EGLConfig most closely matching the specified hints

//

static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,

const _GLFWfbconfig* desired,

EGLConfig* result)

{

EGLConfig* nativeConfigs;

_GLFWfbconfig* usableConfigs;

const _GLFWfbconfig* closest;

int i, nativeCount, usableCount;

eglGetConfigs(_glfw.egl.display, NULL, 0, &nativeCount);

if (!nativeCount)

{

_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: No EGLConfigs returned");

return GLFW_FALSE;

}

nativeConfigs = calloc(nativeCount, sizeof(EGLConfig));

eglGetConfigs(_glfw.egl.display, nativeConfigs, nativeCount, &nativeCount);

usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));

usableCount = 0;

for (i = 0; i < nativeCount; i++)

{

const EGLConfig n = nativeConfigs[i];

_GLFWfbconfig* u = usableConfigs + usableCount;

// Only consider RGB(A) EGLConfigs

if (getEGLConfigAttrib(n, EGL_COLOR_BUFFER_TYPE) != EGL_RGB_BUFFER)

continue;

// Only consider window EGLConfigs

if (!(getEGLConfigAttrib(n, EGL_SURFACE_TYPE) & EGL_WINDOW_BIT))

continue;

#if defined(_GLFW_X11)

// Only consider EGLConfigs with associated Visuals

if (!getEGLConfigAttrib(n, EGL_NATIVE_VISUAL_ID))

continue;

#endif // _GLFW_X11

if (ctxconfig->client == GLFW_OPENGL_ES_API)

{

if (ctxconfig->major == 1)

{

if (!(getEGLConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES_BIT))

continue;

}

else

{

if (!(getEGLConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES2_BIT))

continue;

}

}

else if (ctxconfig->client == GLFW_OPENGL_API)

{

if (!(getEGLConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_BIT))

continue;

}

u->redBits = getEGLConfigAttrib(n, EGL_RED_SIZE);

u->greenBits = getEGLConfigAttrib(n, EGL_GREEN_SIZE);

u->blueBits = getEGLConfigAttrib(n, EGL_BLUE_SIZE);

u->alphaBits = getEGLConfigAttrib(n, EGL_ALPHA_SIZE);

u->depthBits = getEGLConfigAttrib(n, EGL_DEPTH_SIZE);

u->stencilBits = getEGLConfigAttrib(n, EGL_STENCIL_SIZE);

u->samples = getEGLConfigAttrib(n, EGL_SAMPLES);

u->doublebuffer = GLFW_TRUE;

u->handle = (uintptr_t) n;

usableCount++;

}

closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);

if (closest)

*result = (EGLConfig) closest->handle;

free(nativeConfigs);

free(usableConfigs);

return closest != NULL;

}

static void makeContextCurrentEGL(_GLFWwindow* window)

{

if (window)

{

if (!eglMakeCurrent(_glfw.egl.display,

window->context.egl.surface,

window->context.egl.surface,

window->context.egl.handle))

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: Failed to make context current: %s",

getEGLErrorString(eglGetError()));

return;

}

}

else

{

if (!eglMakeCurrent(_glfw.egl.display,

EGL_NO_SURFACE,

EGL_NO_SURFACE,

EGL_NO_CONTEXT))

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: Failed to clear current context: %s",

getEGLErrorString(eglGetError()));

return;

}

}

_glfwPlatformSetCurrentContext(window);

}

static void swapBuffersEGL(_GLFWwindow* window)

{

if (window != _glfwPlatformGetCurrentContext())

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: The context must be current on the calling thread when swapping buffers");

return;

}

eglSwapBuffers(_glfw.egl.display, window->context.egl.surface);

}

static void swapIntervalEGL(int interval)

{

eglSwapInterval(_glfw.egl.display, interval);

}

static int extensionSupportedEGL(const char* extension)

{

const char* extensions = eglQueryString(_glfw.egl.display, EGL_EXTENSIONS);

if (extensions)

{

if (_glfwStringInExtensionString(extension, extensions))

return GLFW_TRUE;

}

return GLFW_FALSE;

}

static GLFWglproc getProcAddressEGL(const char* procname)

{

_GLFWwindow* window = _glfwPlatformGetCurrentContext();

if (window->context.egl.client)

{

GLFWglproc proc = (GLFWglproc) _glfw_dlsym(window->context.egl.client,

procname);

if (proc)

return proc;

}

return eglGetProcAddress(procname);

}

static void destroyContextEGL(_GLFWwindow* window)

{

#if defined(_GLFW_X11)

// NOTE: Do not unload libGL.so.1 while the X11 display is still open,

// as it will make XCloseDisplay segfault

if (window->context.client != GLFW_OPENGL_API)

#endif // _GLFW_X11

{

if (window->context.egl.client)

{

_glfw_dlclose(window->context.egl.client);

window->context.egl.client = NULL;

}

}

if (window->context.egl.surface)

{

eglDestroySurface(_glfw.egl.display, window->context.egl.surface);

window->context.egl.surface = EGL_NO_SURFACE;

}

if (window->context.egl.handle)

{

eglDestroyContext(_glfw.egl.display, window->context.egl.handle);

window->context.egl.handle = EGL_NO_CONTEXT;

}

}

//////////////////////////////////////////////////////////////////////////

////// GLFW internal API //////

//////////////////////////////////////////////////////////////////////////

// Initialize EGL

//

GLFWbool _glfwInitEGL(void)

{

int i;

const char* sonames[] =

{

#if defined(_GLFW_WIN32)

"libEGL.dll",

"EGL.dll",

#elif defined(_GLFW_COCOA)

"libEGL.dylib",

#else

"libEGL.so.1",

#endif

NULL

};

if (_glfw.egl.handle)

return GLFW_TRUE;

for (i = 0; sonames[i]; i++)

{

_glfw.egl.handle = _glfw_dlopen(sonames[i]);

if (_glfw.egl.handle)

break;

}

if (!_glfw.egl.handle)

{

_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: Library not found");

return GLFW_FALSE;

}

_glfw.egl.prefix = (strncmp(sonames[i], "lib", 3) == 0);

_glfw.egl.GetConfigAttrib = (PFN_eglGetConfigAttrib)

_glfw_dlsym(_glfw.egl.handle, "eglGetConfigAttrib");

_glfw.egl.GetConfigs = (PFN_eglGetConfigs)

_glfw_dlsym(_glfw.egl.handle, "eglGetConfigs");

_glfw.egl.GetDisplay = (PFN_eglGetDisplay)

_glfw_dlsym(_glfw.egl.handle, "eglGetDisplay");

_glfw.egl.GetError = (PFN_eglGetError)

_glfw_dlsym(_glfw.egl.handle, "eglGetError");

_glfw.egl.Initialize = (PFN_eglInitialize)

_glfw_dlsym(_glfw.egl.handle, "eglInitialize");

_glfw.egl.Terminate = (PFN_eglTerminate)

_glfw_dlsym(_glfw.egl.handle, "eglTerminate");

_glfw.egl.BindAPI = (PFN_eglBindAPI)

_glfw_dlsym(_glfw.egl.handle, "eglBindAPI");

_glfw.egl.CreateContext = (PFN_eglCreateContext)

_glfw_dlsym(_glfw.egl.handle, "eglCreateContext");

_glfw.egl.DestroySurface = (PFN_eglDestroySurface)

_glfw_dlsym(_glfw.egl.handle, "eglDestroySurface");

_glfw.egl.DestroyContext = (PFN_eglDestroyContext)

_glfw_dlsym(_glfw.egl.handle, "eglDestroyContext");

_glfw.egl.CreateWindowSurface = (PFN_eglCreateWindowSurface)

_glfw_dlsym(_glfw.egl.handle, "eglCreateWindowSurface");

_glfw.egl.MakeCurrent = (PFN_eglMakeCurrent)

_glfw_dlsym(_glfw.egl.handle, "eglMakeCurrent");

_glfw.egl.SwapBuffers = (PFN_eglSwapBuffers)

_glfw_dlsym(_glfw.egl.handle, "eglSwapBuffers");

_glfw.egl.SwapInterval = (PFN_eglSwapInterval)

_glfw_dlsym(_glfw.egl.handle, "eglSwapInterval");

_glfw.egl.QueryString = (PFN_eglQueryString)

_glfw_dlsym(_glfw.egl.handle, "eglQueryString");

_glfw.egl.GetProcAddress = (PFN_eglGetProcAddress)

_glfw_dlsym(_glfw.egl.handle, "eglGetProcAddress");

if (!_glfw.egl.GetConfigAttrib ||

!_glfw.egl.GetConfigs ||

!_glfw.egl.GetDisplay ||

!_glfw.egl.GetError ||

!_glfw.egl.Initialize ||

!_glfw.egl.Terminate ||

!_glfw.egl.BindAPI ||

!_glfw.egl.CreateContext ||

!_glfw.egl.DestroySurface ||

!_glfw.egl.DestroyContext ||

!_glfw.egl.CreateWindowSurface ||

!_glfw.egl.MakeCurrent ||

!_glfw.egl.SwapBuffers ||

!_glfw.egl.SwapInterval ||

!_glfw.egl.QueryString ||

!_glfw.egl.GetProcAddress)

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: Failed to load required entry points");

_glfwTerminateEGL();

return GLFW_FALSE;

}

_glfw.egl.display = eglGetDisplay(_GLFW_EGL_NATIVE_DISPLAY);

if (_glfw.egl.display == EGL_NO_DISPLAY)

{

_glfwInputError(GLFW_API_UNAVAILABLE,

"EGL: Failed to get EGL display: %s",

getEGLErrorString(eglGetError()));

_glfwTerminateEGL();

return GLFW_FALSE;

}

if (!eglInitialize(_glfw.egl.display, &_glfw.egl.major, &_glfw.egl.minor))

{

_glfwInputError(GLFW_API_UNAVAILABLE,

"EGL: Failed to initialize EGL: %s",

getEGLErrorString(eglGetError()));

_glfwTerminateEGL();

return GLFW_FALSE;

}

_glfw.egl.KHR_create_context =

extensionSupportedEGL("EGL_KHR_create_context");

_glfw.egl.KHR_create_context_no_error =

extensionSupportedEGL("EGL_KHR_create_context_no_error");

_glfw.egl.KHR_gl_colorspace =

extensionSupportedEGL("EGL_KHR_gl_colorspace");

_glfw.egl.KHR_get_all_proc_addresses =

extensionSupportedEGL("EGL_KHR_get_all_proc_addresses");

return GLFW_TRUE;

}

// Terminate EGL

//

void _glfwTerminateEGL(void)

{

if (_glfw.egl.display)

{

eglTerminate(_glfw.egl.display);

_glfw.egl.display = EGL_NO_DISPLAY;

}

if (_glfw.egl.handle)

{

_glfw_dlclose(_glfw.egl.handle);

_glfw.egl.handle = NULL;

}

}

#define setEGLattrib(attribName, attribValue) \

{ \

attribs[index++] = attribName; \

attribs[index++] = attribValue; \

assert((size_t) index < sizeof(attribs) / sizeof(attribs[0])); \

}

// Create the OpenGL or OpenGL ES context

//

GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,

const _GLFWctxconfig* ctxconfig,

const _GLFWfbconfig* fbconfig)

{

EGLint attribs[40];

EGLConfig config;

EGLContext share = NULL;

if (!_glfw.egl.display)

{

_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: API not available");

return GLFW_FALSE;

}

if (ctxconfig->share)

share = ctxconfig->share->context.egl.handle;

if (!chooseEGLConfig(ctxconfig, fbconfig, &config))

{

_glfwInputError(GLFW_FORMAT_UNAVAILABLE,

"EGL: Failed to find a suitable EGLConfig");

return GLFW_FALSE;

}

if (ctxconfig->client == GLFW_OPENGL_ES_API)

{

if (!eglBindAPI(EGL_OPENGL_ES_API))

{

_glfwInputError(GLFW_API_UNAVAILABLE,

"EGL: Failed to bind OpenGL ES: %s",

getEGLErrorString(eglGetError()));

return GLFW_FALSE;

}

}

else

{

if (!eglBindAPI(EGL_OPENGL_API))

{

_glfwInputError(GLFW_API_UNAVAILABLE,

"EGL: Failed to bind OpenGL: %s",

getEGLErrorString(eglGetError()));

return GLFW_FALSE;

}

}

if (_glfw.egl.KHR_create_context)

{

int index = 0, mask = 0, flags = 0;

if (ctxconfig->client == GLFW_OPENGL_API)

{

if (ctxconfig->forward)

flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;

if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)

mask |= EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;

else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)

mask |= EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;

if (_glfw.egl.KHR_create_context_no_error)

{

if (ctxconfig->noerror)

flags |= EGL_CONTEXT_OPENGL_NO_ERROR_KHR;

}

}

if (ctxconfig->debug)

flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;

if (ctxconfig->robustness)

{

if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)

{

setEGLattrib(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR,

EGL_NO_RESET_NOTIFICATION_KHR);

}

else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)

{

setEGLattrib(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR,

EGL_LOSE_CONTEXT_ON_RESET_KHR);

}

flags |= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR;

}

if (ctxconfig->major != 1 || ctxconfig->minor != 0)

{

setEGLattrib(EGL_CONTEXT_MAJOR_VERSION_KHR, ctxconfig->major);

setEGLattrib(EGL_CONTEXT_MINOR_VERSION_KHR, ctxconfig->minor);

}

if (mask)

setEGLattrib(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, mask);

if (flags)

setEGLattrib(EGL_CONTEXT_FLAGS_KHR, flags);

setEGLattrib(EGL_NONE, EGL_NONE);

}

else

{

int index = 0;

if (ctxconfig->client == GLFW_OPENGL_ES_API)

setEGLattrib(EGL_CONTEXT_CLIENT_VERSION, ctxconfig->major);

setEGLattrib(EGL_NONE, EGL_NONE);

}

// Context release behaviors (GL_KHR_context_flush_control) are not yet

// supported on EGL but are not a hard constraint, so ignore and continue

window->context.egl.handle = eglCreateContext(_glfw.egl.display,

config, share, attribs);

if (window->context.egl.handle == EGL_NO_CONTEXT)

{

_glfwInputError(GLFW_VERSION_UNAVAILABLE,

"EGL: Failed to create context: %s",

getEGLErrorString(eglGetError()));

return GLFW_FALSE;

}

// Set up attributes for surface creation

{

int index = 0;

if (fbconfig->sRGB)

{

if (_glfw.egl.KHR_gl_colorspace)

{

setEGLattrib(EGL_GL_COLORSPACE_KHR, EGL_GL_COLORSPACE_SRGB_KHR);

}

}

setEGLattrib(EGL_NONE, EGL_NONE);

}

window->context.egl.surface =

eglCreateWindowSurface(_glfw.egl.display,

config,

_GLFW_EGL_NATIVE_WINDOW,

attribs);

if (window->context.egl.surface == EGL_NO_SURFACE)

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: Failed to create window surface: %s",

getEGLErrorString(eglGetError()));

return GLFW_FALSE;

}

window->context.egl.config = config;

// Load the appropriate client library

if (!_glfw.egl.KHR_get_all_proc_addresses)

{

int i;

const char** sonames;

const char* es1sonames[] =

{

#if defined(_GLFW_WIN32)

"GLESv1_CM.dll",

"libGLES_CM.dll",

#elif defined(_GLFW_COCOA)

"libGLESv1_CM.dylib",

#else

"libGLESv1_CM.so.1",

"libGLES_CM.so.1",

#endif

NULL

};

const char* es2sonames[] =

{

#if defined(_GLFW_WIN32)

"GLESv2.dll",

"libGLESv2.dll",

#elif defined(_GLFW_COCOA)

"libGLESv2.dylib",

#else

"libGLESv2.so.2",

#endif

NULL

};

const char* glsonames[] =

{

#if defined(_GLFW_WIN32)

#elif defined(_GLFW_COCOA)

#else

"libGL.so.1",

#endif

NULL

};

if (ctxconfig->client == GLFW_OPENGL_ES_API)

{

if (ctxconfig->major == 1)

sonames = es1sonames;

else

sonames = es2sonames;

}

else

sonames = glsonames;

for (i = 0; sonames[i]; i++)

{

// HACK: Match presence of lib prefix to increase chance of finding

// a matching pair in the jungle that is Win32 EGL/GLES

if (_glfw.egl.prefix != (strncmp(sonames[i], "lib", 3) == 0))

continue;

window->context.egl.client = _glfw_dlopen(sonames[i]);

if (window->context.egl.client)

break;

}

if (!window->context.egl.client)

{

_glfwInputError(GLFW_API_UNAVAILABLE,

"EGL: Failed to load client library");

return GLFW_FALSE;

}

}

window->context.makeCurrent = makeContextCurrentEGL;

window->context.swapBuffers = swapBuffersEGL;

window->context.swapInterval = swapIntervalEGL;

window->context.extensionSupported = extensionSupportedEGL;

window->context.getProcAddress = getProcAddressEGL;

window->context.destroy = destroyContextEGL;

return GLFW_TRUE;

}

#undef setEGLattrib

// Returns the Visual and depth of the chosen EGLConfig

//

#if defined(_GLFW_X11)

GLFWbool _glfwChooseVisualEGL(const _GLFWctxconfig* ctxconfig,

const _GLFWfbconfig* fbconfig,

Visual** visual, int* depth)

{

XVisualInfo* result;

XVisualInfo desired;

EGLConfig native;

EGLint visualID = 0, count = 0;

const long vimask = VisualScreenMask | VisualIDMask;

if (!chooseEGLConfig(ctxconfig, fbconfig, &native))

{

_glfwInputError(GLFW_FORMAT_UNAVAILABLE,

"EGL: Failed to find a suitable EGLConfig");

return GLFW_FALSE;

}

eglGetConfigAttrib(_glfw.egl.display, native,

EGL_NATIVE_VISUAL_ID, &visualID);

desired.screen = _glfw.x11.screen;

desired.visualid = visualID;

result = XGetVisualInfo(_glfw.x11.display, vimask, &desired, &count);

if (!result)

{

_glfwInputError(GLFW_PLATFORM_ERROR,

"EGL: Failed to retrieve Visual for EGLConfig");

return GLFW_FALSE;

}

*visual = result->visual;

*depth = result->depth;

XFree(result);

return GLFW_TRUE;

}

#endif // _GLFW_X11

//////////////////////////////////////////////////////////////////////////

////// GLFW native API //////

//////////////////////////////////////////////////////////////////////////

GLFWAPI EGLDisplay glfwGetEGLDisplay(void)

{

_GLFW_REQUIRE_INIT_OR_RETURN(EGL_NO_DISPLAY);

return _glfw.egl.display;

}

GLFWAPI EGLContext glfwGetEGLContext(GLFWwindow* handle)

{

_GLFWwindow* window = (_GLFWwindow*) handle;

_GLFW_REQUIRE_INIT_OR_RETURN(EGL_NO_CONTEXT);

if (window->context.client == GLFW_NO_API)

{

_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);

return EGL_NO_CONTEXT;

}

return window->context.egl.handle;

}

GLFWAPI EGLSurface glfwGetEGLSurface(GLFWwindow* handle)

{

_GLFWwindow* window = (_GLFWwindow*) handle;

_GLFW_REQUIRE_INIT_OR_RETURN(EGL_NO_SURFACE);

if (window->context.client == GLFW_NO_API)

{

_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);

return EGL_NO_SURFACE;

}

return window->context.egl.surface;

}