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kitty/glfw/egl_context.c
Kovid Goyal fa823a37ae
Backport 6281f498c8
2022-06-23 13:00:28 +05:30

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//========================================================================
// GLFW 3.4 EGL - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2019 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.
//
//========================================================================
// Please use C89 style variable declarations in this file because VS 2010
//========================================================================
#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";
}
}
#ifdef _GLFW_X11
// 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;
}
#endif
// Return the EGLConfig most closely matching the specified hints
//
static bool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* desired,
EGLConfig* result)
{
EGLConfig configs[512];
int i = 0, nativeCount = 0, ans_idx = 0;
EGLint attributes[64];
#define ATTR(k, v) { attributes[i++] = k; attributes[i++] = v; }
ATTR(EGL_COLOR_BUFFER_TYPE, EGL_RGB_BUFFER);
ATTR(EGL_SURFACE_TYPE, EGL_WINDOW_BIT);
if (ctxconfig->client == GLFW_OPENGL_ES_API) {
if (ctxconfig->major == 1) ATTR(EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT)
else ATTR(EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT);
}
else if (ctxconfig->client == GLFW_OPENGL_API) ATTR(EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT);
if (desired->samples > 0) ATTR(EGL_SAMPLES, desired->samples);
if (desired->depthBits > 0) ATTR(EGL_DEPTH_SIZE, desired->depthBits);
if (desired->stencilBits > 0) ATTR(EGL_STENCIL_SIZE, desired->stencilBits);
if (desired->redBits > 0) ATTR(EGL_RED_SIZE, desired->redBits);
if (desired->greenBits > 0) ATTR(EGL_GREEN_SIZE, desired->greenBits);
if (desired->blueBits > 0) ATTR(EGL_BLUE_SIZE, desired->blueBits);
if (desired->alphaBits > 0) ATTR(EGL_ALPHA_SIZE, desired->alphaBits);
ATTR(EGL_NONE, EGL_NONE);
#undef ATTR
if (!eglChooseConfig(_glfw.egl.display, attributes, configs, sizeof(configs)/sizeof(configs[0]), &nativeCount)) {
_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: eglChooseConfig failed");
return false;
}
if (!nativeCount)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: No EGLConfigs returned");
return false;
}
for (i = 0; i < nativeCount; i++)
{
#if defined(_GLFW_X11)
{
const EGLConfig n = configs[i];
XVisualInfo vi = {0};
// Only consider EGLConfigs with associated Visuals
vi.visualid = getEGLConfigAttrib(n, EGL_NATIVE_VISUAL_ID);
if (!vi.visualid)
continue;
if (desired->transparent)
{
int count;
XVisualInfo* vis =
XGetVisualInfo(_glfw.x11.display, VisualIDMask, &vi, &count);
if (vis)
{
bool transparent = _glfwIsVisualTransparentX11(vis[0].visual);
XFree(vis);
if (!transparent) continue;
}
}
}
#endif // _GLFW_X11
ans_idx = i;
break;
}
*result = configs[ans_idx];
return true;
}
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;
}
}
_glfwPlatformSetTls(&_glfw.contextSlot, window);
}
static void swapBuffersEGL(_GLFWwindow* window)
{
if (window != _glfwPlatformGetTls(&_glfw.contextSlot))
{
_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 true;
}
return false;
}
static GLFWglproc getProcAddressEGL(const char* procname)
{
_GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
if (window->context.egl.client)
{
GLFWglproc proc = NULL;
glfw_dlsym(proc, 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
//
bool _glfwInitEGL(void)
{
int i;
EGLint* attribs = NULL;
const char* extensions;
const char* sonames[] =
{
#if defined(_GLFW_EGL_LIBRARY)
_GLFW_EGL_LIBRARY,
#elif defined(_GLFW_WIN32)
"libEGL.dll",
"EGL.dll",
#elif defined(_GLFW_COCOA)
"libEGL.dylib",
#elif defined(__CYGWIN__)
"libEGL-1.so",
#else
"libEGL.so.1",
#endif
NULL
};
if (_glfw.egl.handle)
return 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 false;
}
_glfw.egl.prefix = (strncmp(sonames[i], "lib", 3) == 0);
glfw_dlsym(_glfw.egl.GetConfigAttrib, _glfw.egl.handle, "eglGetConfigAttrib");
glfw_dlsym(_glfw.egl.GetConfigs, _glfw.egl.handle, "eglGetConfigs");
glfw_dlsym(_glfw.egl.ChooseConfig, _glfw.egl.handle, "eglChooseConfig");
glfw_dlsym(_glfw.egl.GetDisplay, _glfw.egl.handle, "eglGetDisplay");
glfw_dlsym(_glfw.egl.GetError, _glfw.egl.handle, "eglGetError");
glfw_dlsym(_glfw.egl.Initialize, _glfw.egl.handle, "eglInitialize");
glfw_dlsym(_glfw.egl.Terminate, _glfw.egl.handle, "eglTerminate");
glfw_dlsym(_glfw.egl.BindAPI, _glfw.egl.handle, "eglBindAPI");
glfw_dlsym(_glfw.egl.CreateContext, _glfw.egl.handle, "eglCreateContext");
glfw_dlsym(_glfw.egl.DestroySurface, _glfw.egl.handle, "eglDestroySurface");
glfw_dlsym(_glfw.egl.DestroyContext, _glfw.egl.handle, "eglDestroyContext");
glfw_dlsym(_glfw.egl.CreateWindowSurface, _glfw.egl.handle, "eglCreateWindowSurface");
glfw_dlsym(_glfw.egl.MakeCurrent, _glfw.egl.handle, "eglMakeCurrent");
glfw_dlsym(_glfw.egl.SwapBuffers, _glfw.egl.handle, "eglSwapBuffers");
glfw_dlsym(_glfw.egl.SwapInterval, _glfw.egl.handle, "eglSwapInterval");
glfw_dlsym(_glfw.egl.QueryString, _glfw.egl.handle, "eglQueryString");
glfw_dlsym(_glfw.egl.GetProcAddress, _glfw.egl.handle, "eglGetProcAddress");
if (!_glfw.egl.GetConfigAttrib ||
!_glfw.egl.GetConfigs ||
!_glfw.egl.ChooseConfig ||
!_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 false;
}
extensions = eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS);
if (extensions && eglGetError() == EGL_SUCCESS)
_glfw.egl.EXT_client_extensions = true;
if (_glfw.egl.EXT_client_extensions)
{
_glfw.egl.EXT_platform_base =
_glfwStringInExtensionString("EGL_EXT_platform_base", extensions);
_glfw.egl.EXT_platform_x11 =
_glfwStringInExtensionString("EGL_EXT_platform_x11", extensions);
_glfw.egl.EXT_platform_wayland =
_glfwStringInExtensionString("EGL_EXT_platform_wayland", extensions);
_glfw.egl.ANGLE_platform_angle =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle", extensions);
_glfw.egl.ANGLE_platform_angle_opengl =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_opengl", extensions);
_glfw.egl.ANGLE_platform_angle_d3d =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_d3d", extensions);
_glfw.egl.ANGLE_platform_angle_vulkan =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_vulkan", extensions);
_glfw.egl.ANGLE_platform_angle_metal =
_glfwStringInExtensionString("EGL_ANGLE_platform_angle_metal", extensions);
}
if (_glfw.egl.EXT_platform_base)
{
_glfw.egl.GetPlatformDisplayEXT = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
eglGetProcAddress("eglGetPlatformDisplayEXT");
_glfw.egl.CreatePlatformWindowSurfaceEXT = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
}
_glfw.egl.platform = _glfwPlatformGetEGLPlatform(&attribs);
if (_glfw.egl.platform)
{
_glfw.egl.display =
eglGetPlatformDisplayEXT(_glfw.egl.platform,
_glfwPlatformGetEGLNativeDisplay(),
attribs);
}
else
_glfw.egl.display = eglGetDisplay(_glfwPlatformGetEGLNativeDisplay());
free(attribs);
if (_glfw.egl.display == EGL_NO_DISPLAY)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"EGL: Failed to get EGL display: %s",
getEGLErrorString(eglGetError()));
_glfwTerminateEGL();
return 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 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");
_glfw.egl.KHR_context_flush_control =
extensionSupportedEGL("EGL_KHR_context_flush_control");
_glfw.egl.EXT_present_opaque =
extensionSupportedEGL("EGL_EXT_present_opaque");
return 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 setAttrib(a, v) \
{ \
assert(((size_t) index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
attribs[index++] = a; \
attribs[index++] = v; \
}
// Create the OpenGL or OpenGL ES context
//
bool _glfwCreateContextEGL(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig)
{
EGLint attribs[40];
EGLConfig config;
EGLContext share = NULL;
EGLNativeWindowType native;
int index = 0;
if (!_glfw.egl.display)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "EGL: API not available");
return 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 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 false;
}
}
else
{
if (!eglBindAPI(EGL_OPENGL_API))
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"EGL: Failed to bind OpenGL: %s",
getEGLErrorString(eglGetError()));
return false;
}
}
if (_glfw.egl.KHR_create_context)
{
int 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 (ctxconfig->debug)
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
if (ctxconfig->robustness)
{
if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
{
setAttrib(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR,
EGL_NO_RESET_NOTIFICATION_KHR);
}
else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
{
setAttrib(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR,
EGL_LOSE_CONTEXT_ON_RESET_KHR);
}
flags |= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR;
}
if (ctxconfig->noerror)
{
if (_glfw.egl.KHR_create_context_no_error)
setAttrib(EGL_CONTEXT_OPENGL_NO_ERROR_KHR, true);
}
if (ctxconfig->major != 1 || ctxconfig->minor != 0)
{
setAttrib(EGL_CONTEXT_MAJOR_VERSION_KHR, ctxconfig->major);
setAttrib(EGL_CONTEXT_MINOR_VERSION_KHR, ctxconfig->minor);
}
if (mask)
setAttrib(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, mask);
if (flags)
setAttrib(EGL_CONTEXT_FLAGS_KHR, flags);
}
else
{
if (ctxconfig->client == GLFW_OPENGL_ES_API)
setAttrib(EGL_CONTEXT_CLIENT_VERSION, ctxconfig->major);
}
if (_glfw.egl.KHR_context_flush_control)
{
if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_NONE)
{
setAttrib(EGL_CONTEXT_RELEASE_BEHAVIOR_KHR,
EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR);
}
else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)
{
setAttrib(EGL_CONTEXT_RELEASE_BEHAVIOR_KHR,
EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR);
}
}
setAttrib(EGL_NONE, EGL_NONE);
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 false;
}
// Set up attributes for surface creation
index = 0;
if (fbconfig->sRGB)
{
if (_glfw.egl.KHR_gl_colorspace)
setAttrib(EGL_GL_COLORSPACE_KHR, EGL_GL_COLORSPACE_SRGB_KHR);
}
if (_glfw.egl.EXT_present_opaque)
setAttrib(EGL_PRESENT_OPAQUE_EXT, !fbconfig->transparent);
setAttrib(EGL_NONE, EGL_NONE);
native = _glfwPlatformGetEGLNativeWindow(window);
// HACK: ANGLE does not implement eglCreatePlatformWindowSurfaceEXT
// despite reporting EGL_EXT_platform_base
if (_glfw.egl.platform && _glfw.egl.platform != EGL_PLATFORM_ANGLE_ANGLE)
{
window->context.egl.surface =
eglCreatePlatformWindowSurfaceEXT(_glfw.egl.display, config, native, attribs);
}
else
{
window->context.egl.surface =
eglCreateWindowSurface(_glfw.egl.display, config, native, attribs);
}
if (window->context.egl.surface == EGL_NO_SURFACE)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to create window surface: %s",
getEGLErrorString(eglGetError()));
return false;
}
window->context.egl.config = config;
EGLint a = EGL_MIN_SWAP_INTERVAL;
if (!eglGetConfigAttrib(_glfw.egl.display, config, a, &a)) {
_glfwInputError(GLFW_VERSION_UNAVAILABLE, "EGL: could not check for non-blocking buffer swap with error: %s", getEGLErrorString(eglGetError()));
} else {
if (a > 0) {
_glfwInputError(GLFW_VERSION_UNAVAILABLE, "EGL: non-blocking swap buffers not available, minimum swap interval is: %d", a);
}
}
// Load the appropriate client library
if (!_glfw.egl.KHR_get_all_proc_addresses)
{
int i;
const char** sonames;
const char* es1sonames[] =
{
#if defined(_GLFW_GLESV1_LIBRARY)
_GLFW_GLESV1_LIBRARY,
#elif 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_GLESV2_LIBRARY)
_GLFW_GLESV2_LIBRARY,
#elif defined(_GLFW_WIN32)
"GLESv2.dll",
"libGLESv2.dll",
#elif defined(_GLFW_COCOA)
"libGLESv2.dylib",
#elif defined(__CYGWIN__)
"libGLESv2-2.so",
#else
"libGLESv2.so.2",
#endif
NULL
};
const char* glsonames[] =
{
#if defined(_GLFW_OPENGL_LIBRARY)
_GLFW_OPENGL_LIBRARY,
#elif 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 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 true;
}
#undef setAttrib
// Returns the Visual and depth of the chosen EGLConfig
//
#if defined(_GLFW_X11)
bool _glfwChooseVisualEGL(const _GLFWwndconfig* wndconfig UNUSED,
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 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 false;
}
*visual = result->visual;
*depth = result->depth;
XFree(result);
return 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;
}
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