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glfw/src/egl_context.c
Camilla Berglund d82f068f7e Reintroduced manual framebuffer config selection. 
The default behavior of WGL, EGL and GLX is to choose a config that has
/at least/ the specified number of bits, whereas the GLFW 2 behavior was
to choose the closest match with very few hard constraints.  Moving the
responsibility of finding the supported minimum values to the client was
problematic, as there's no way to enumerate supported configurations,
forcing the client to perform multiple (and slow) window/context
creation attempts.  Not even the currently set defaults (24-bit color
and depth, 8-bit stencil) is universally supported, as bug reports show.
2013-05-13 15:58:36 +02:00

550 lines
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//========================================================================
// GLFW - An OpenGL library
// Platform: EGL
// API version: 3.0
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.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 <stdlib.h>
#include <assert.h>
// Thread local storage attribute macro
//
#if defined(_MSC_VER)
#define _GLFW_TLS __declspec(thread)
#elif defined(__GNUC__)
#define _GLFW_TLS __thread
#else
#define _GLFW_TLS
#endif
// The per-thread current context/window pointer
//
static _GLFW_TLS _GLFWwindow* _glfwCurrentWindow = NULL;
// Return a description of the specified EGL error
//
static const char* getErrorString(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";
}
return "UNKNOWN EGL ERROR";
}
// Returns the specified attribute of the specified EGLConfig
//
static int getConfigAttrib(EGLConfig config, int attrib)
{
int value;
eglGetConfigAttrib(_glfw.egl.display, config, attrib, &value);
return value;
}
// Return a list of available and usable framebuffer configs
//
static GLboolean chooseFBConfigs(const _GLFWwndconfig* wndconfig,
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 GL_FALSE;
}
nativeConfigs = (EGLConfig*) calloc(nativeCount, sizeof(EGLConfig));
eglGetConfigs(_glfw.egl.display, nativeConfigs, nativeCount, &nativeCount);
usableConfigs = (_GLFWfbconfig*) calloc(nativeCount, sizeof(_GLFWfbconfig));
usableCount = 0;
for (i = 0; i < nativeCount; i++)
{
const EGLConfig n = nativeConfigs[i];
_GLFWfbconfig* u = usableConfigs + usableCount;
#if defined(_GLFW_X11)
if (!getConfigAttrib(n, EGL_NATIVE_VISUAL_ID))
{
// Only consider EGLConfigs with associated visuals
continue;
}
#endif // _GLFW_X11
if (!(getConfigAttrib(n, EGL_COLOR_BUFFER_TYPE) & EGL_RGB_BUFFER))
{
// Only consider RGB(A) EGLConfigs
continue;
}
if (!(getConfigAttrib(n, EGL_SURFACE_TYPE) & EGL_WINDOW_BIT))
{
// Only consider window EGLConfigs
continue;
}
if (wndconfig->clientAPI == GLFW_OPENGL_ES_API)
{
if (wndconfig->glMajor == 1)
{
if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES_BIT))
continue;
}
else
{
if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES2_BIT))
continue;
}
}
else if (wndconfig->clientAPI == GLFW_OPENGL_API)
{
if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_BIT))
continue;
}
u->redBits = getConfigAttrib(n, EGL_RED_SIZE);
u->greenBits = getConfigAttrib(n, EGL_GREEN_SIZE);
u->blueBits = getConfigAttrib(n, EGL_BLUE_SIZE);
u->alphaBits = getConfigAttrib(n, EGL_ALPHA_SIZE);
u->depthBits = getConfigAttrib(n, EGL_DEPTH_SIZE);
u->stencilBits = getConfigAttrib(n, EGL_STENCIL_SIZE);
u->samples = getConfigAttrib(n, EGL_SAMPLES);
u->egl = n;
usableCount++;
}
closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
if (closest)
*result = closest->egl;
free(nativeConfigs);
free(usableConfigs);
return closest ? GL_TRUE : GL_FALSE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialize EGL
//
int _glfwInitContextAPI(void)
{
_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",
getErrorString(eglGetError()));
return GL_FALSE;
}
if (!eglInitialize(_glfw.egl.display,
&_glfw.egl.versionMajor,
&_glfw.egl.versionMinor))
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"EGL: Failed to initialize EGL: %s",
getErrorString(eglGetError()));
return GL_FALSE;
}
if (_glfwPlatformExtensionSupported("EGL_KHR_create_context"))
_glfw.egl.KHR_create_context = GL_TRUE;
return GL_TRUE;
}
// Terminate EGL
//
void _glfwTerminateContextAPI(void)
{
eglTerminate(_glfw.egl.display);
}
#define setEGLattrib(attribName, attribValue) \
{ \
attribs[index++] = attribName; \
attribs[index++] = attribValue; \
assert(index < sizeof(attribs) / sizeof(attribs[0])); \
}
// Prepare for creation of the OpenGL context
//
int _glfwCreateContext(_GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
int attribs[40];
EGLint count = 0;
EGLConfig config;
EGLContext share = NULL;
if (wndconfig->share)
share = wndconfig->share->egl.context;
if (!chooseFBConfigs(wndconfig, fbconfig, &config))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to find a suitable EGLConfig");
return GL_FALSE;
}
#if defined(_GLFW_X11)
// Retrieve the visual corresponding to the chosen EGL config
{
int mask;
EGLint redBits, greenBits, blueBits, alphaBits, visualID = 0;
XVisualInfo info;
eglGetConfigAttrib(_glfw.egl.display, config,
EGL_NATIVE_VISUAL_ID, &visualID);
info.screen = _glfw.x11.screen;
mask = VisualScreenMask;
if (visualID)
{
// The X window visual must match the EGL config
info.visualid = visualID;
mask |= VisualIDMask;
}
else
{
// some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID
// attribute, so attempt to find the closest match.
eglGetConfigAttrib(_glfw.egl.display, config,
EGL_RED_SIZE, &redBits);
eglGetConfigAttrib(_glfw.egl.display, config,
EGL_GREEN_SIZE, &greenBits);
eglGetConfigAttrib(_glfw.egl.display, config,
EGL_BLUE_SIZE, &blueBits);
eglGetConfigAttrib(_glfw.egl.display, config,
EGL_ALPHA_SIZE, &alphaBits);
info.depth = redBits + greenBits + blueBits + alphaBits;
mask |= VisualDepthMask;
}
window->egl.visual = XGetVisualInfo(_glfw.x11.display,
mask, &info, &count);
if (window->egl.visual == NULL)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to retrieve visual for EGLConfig");
return GL_FALSE;
}
}
#endif // _GLFW_X11
if (wndconfig->clientAPI == GLFW_OPENGL_ES_API)
{
if (!eglBindAPI(EGL_OPENGL_ES_API))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to bind OpenGL ES: %s",
getErrorString(eglGetError()));
return GL_FALSE;
}
}
else
{
if (!eglBindAPI(EGL_OPENGL_API))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to bind OpenGL: %s",
getErrorString(eglGetError()));
return GL_FALSE;
}
}
if (_glfw.egl.KHR_create_context)
{
int index = 0, mask = 0, flags = 0, strategy = 0;
if (wndconfig->clientAPI == GLFW_OPENGL_API)
{
if (wndconfig->glProfile == GLFW_OPENGL_CORE_PROFILE)
mask |= EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
else if (wndconfig->glProfile == GLFW_OPENGL_COMPAT_PROFILE)
mask |= EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
if (wndconfig->glForward)
flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
if (wndconfig->glDebug)
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
}
if (wndconfig->glRobustness != GLFW_NO_ROBUSTNESS)
{
if (wndconfig->glRobustness == GLFW_NO_RESET_NOTIFICATION)
strategy = EGL_NO_RESET_NOTIFICATION_KHR;
else if (wndconfig->glRobustness == GLFW_LOSE_CONTEXT_ON_RESET)
strategy = EGL_LOSE_CONTEXT_ON_RESET_KHR;
flags |= EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR;
}
if (wndconfig->glMajor != 1 || wndconfig->glMinor != 0)
{
setEGLattrib(EGL_CONTEXT_MAJOR_VERSION_KHR, wndconfig->glMajor);
setEGLattrib(EGL_CONTEXT_MINOR_VERSION_KHR, wndconfig->glMinor);
}
if (mask)
setEGLattrib(EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR, mask);
if (flags)
setEGLattrib(EGL_CONTEXT_FLAGS_KHR, flags);
if (strategy)
setEGLattrib(EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR, strategy);
setEGLattrib(EGL_NONE, EGL_NONE);
}
else
{
int index = 0;
if (wndconfig->clientAPI == GLFW_OPENGL_ES_API)
setEGLattrib(EGL_CONTEXT_CLIENT_VERSION, wndconfig->glMajor);
setEGLattrib(EGL_NONE, EGL_NONE);
}
window->egl.context = eglCreateContext(_glfw.egl.display,
config, share, attribs);
if (window->egl.context == EGL_NO_CONTEXT)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to create context: %s",
getErrorString(eglGetError()));
return GL_FALSE;
}
window->egl.config = config;
return GL_TRUE;
}
#undef setEGLattrib
// Destroy the OpenGL context
//
void _glfwDestroyContext(_GLFWwindow* window)
{
#if defined(_GLFW_X11)
if (window->egl.visual)
{
XFree(window->egl.visual);
window->egl.visual = NULL;
}
#endif // _GLFW_X11
if (window->egl.surface)
{
eglDestroySurface(_glfw.egl.display, window->egl.surface);
window->egl.surface = EGL_NO_SURFACE;
}
if (window->egl.context)
{
eglDestroyContext(_glfw.egl.display, window->egl.context);
window->egl.context = EGL_NO_CONTEXT;
}
}
// Analyzes the specified context for possible recreation
//
int _glfwAnalyzeContext(const _GLFWwindow* window,
const _GLFWwndconfig* wndconfig,
const _GLFWfbconfig* fbconfig)
{
#if defined(_GLFW_WIN32)
return _GLFW_RECREATION_NOT_NEEDED;
#else
return 0;
#endif
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
void _glfwPlatformMakeContextCurrent(_GLFWwindow* window)
{
if (window)
{
if (window->egl.surface == EGL_NO_SURFACE)
{
window->egl.surface = eglCreateWindowSurface(_glfw.egl.display,
window->egl.config,
_GLFW_EGL_NATIVE_WINDOW,
NULL);
if (window->egl.surface == EGL_NO_SURFACE)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"EGL: Failed to create window surface: %s",
getErrorString(eglGetError()));
}
}
eglMakeCurrent(_glfw.egl.display,
window->egl.surface,
window->egl.surface,
window->egl.context);
}
else
{
eglMakeCurrent(_glfw.egl.display,
EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
_glfwCurrentWindow = window;
}
_GLFWwindow* _glfwPlatformGetCurrentContext(void)
{
return _glfwCurrentWindow;
}
void _glfwPlatformSwapBuffers(_GLFWwindow* window)
{
eglSwapBuffers(_glfw.egl.display, window->egl.surface);
}
void _glfwPlatformSwapInterval(int interval)
{
eglSwapInterval(_glfw.egl.display, interval);
}
int _glfwPlatformExtensionSupported(const char* extension)
{
const char* extensions;
extensions = eglQueryString(_glfw.egl.display, EGL_EXTENSIONS);
if (extensions != NULL)
{
if (_glfwStringInExtensionString(extension, (unsigned char*) extensions))
return GL_TRUE;
}
return GL_FALSE;
}
GLFWglproc _glfwPlatformGetProcAddress(const char* procname)
{
return eglGetProcAddress(procname);
}
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI EGLDisplay glfwGetEGLDisplay(void)
{
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return _glfw.egl.display;
}
GLFWAPI EGLContext glfwGetEGLContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
return window->egl.context;
}
GLFWAPI EGLSurface glfwGetEGLSurface(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(0);
return window->egl.surface;
}
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