mirrors/SFML
1
0
Fork 0
mirror of https://github.com/SFML/SFML.git synced 2024-11-25 04:41:05 +08:00
Code Issues Packages Projects Releases Wiki Activity

Removed internal OpenGL contexts, reduced the number of temporary contexts that get created during runtime.

Browse Source
This commit is contained in:
binary1248 2015-10-04 17:03:43 +02:00 committed by Lukas Dürrenberger
parent 95828a85a2
commit 39208efb55
21 changed files with 477 additions and 289 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
include/SFML/Window/GlResource.hpp
View File

@ -29,10 +29,14 @@
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Window/Export.hpp>
#include <SFML/System/NonCopyable.hpp>
namespace sf
{
class Context;
////////////////////////////////////////////////////////////
/// \brief Base class for classes that require an OpenGL context
///
@ -54,10 +58,27 @@ protected:
~GlResource();
////////////////////////////////////////////////////////////
/// \brief Make sure that a valid OpenGL context exists in the current thread
/// \brief RAII helper class to temporarily lock an available context for use
///
////////////////////////////////////////////////////////////
static void ensureGlContext();
class SFML_WINDOW_API TransientContextLock : NonCopyable
{
public:
////////////////////////////////////////////////////////////
/// \brief Default constructor
///
////////////////////////////////////////////////////////////
TransientContextLock();
////////////////////////////////////////////////////////////
/// \brief Destructor
///
////////////////////////////////////////////////////////////
~TransientContextLock();
private:
Context* m_context; ///< Temporary context, in case we needed to create one
};
};
} // namespace sf

4
src/SFML/Graphics/Font.cpp
View File

@ -645,10 +645,6 @@ Glyph Font::loadGlyph(Uint32 codePoint, unsigned int characterSize, bool bold, f
// Delete the FT glyph
FT_Done_Glyph(glyphDesc);
// Force an OpenGL flush, so that the font's texture will appear updated
// in all contexts immediately (solves problems in multi-threaded apps)
glCheck(glFlush());
// Done :)
return glyph;
}

43
src/SFML/Graphics/GLExtensions.cpp
View File

@ -29,6 +29,14 @@
#include <SFML/Window/Context.hpp>
#include <SFML/System/Err.hpp>
#if !defined(GL_MAJOR_VERSION)
#define GL_MAJOR_VERSION 0x821B
#endif
#if !defined(GL_MINOR_VERSION)
#define GL_MINOR_VERSION 0x821C
#endif
namespace sf
{
@ -41,22 +49,41 @@ void ensureExtensionsInit()
static bool initialized = false;
if (!initialized)
{
const Context* context = Context::getActiveContext();
if (!context)
return;
initialized = true;
sfogl_LoadFunctions();
ContextSettings settings = context->getSettings();
// Retrieve the context version number
int majorVersion = 0;
int minorVersion = 0;
if ((settings.majorVersion < 1) || ((settings.majorVersion == 1) && (settings.minorVersion < 1)))
// Try the new way first
glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
glGetIntegerv(GL_MINOR_VERSION, &minorVersion);
if (glGetError() == GL_INVALID_ENUM)
{
// Try the old way
const GLubyte* version = glGetString(GL_VERSION);
if (version)
{
// The beginning of the returned string is "major.minor" (this is standard)
majorVersion = version[0] - '0';
minorVersion = version[2] - '0';
}
else
{
// Can't get the version number, assume 1.1
majorVersion = 1;
minorVersion = 1;
}
}
if ((majorVersion < 1) || ((majorVersion == 1) && (minorVersion < 1)))
{
err() << "sfml-graphics requires support for OpenGL 1.1 or greater" << std::endl;
err() << "Ensure that hardware acceleration is enabled if available" << std::endl;
}
initialized = true;
}
#endif
}

4
src/SFML/Graphics/RenderTextureImplFBO.cpp
View File

@ -48,7 +48,7 @@ m_depthBuffer(0)
////////////////////////////////////////////////////////////
RenderTextureImplFBO::~RenderTextureImplFBO()
{
ensureGlContext();
m_context->setActive(true);
// Destroy the depth buffer
if (m_depthBuffer)
@ -72,7 +72,7 @@ RenderTextureImplFBO::~RenderTextureImplFBO()
////////////////////////////////////////////////////////////
bool RenderTextureImplFBO::isAvailable()
{
ensureGlContext();
TransientContextLock lock;
// Make sure that extensions are initialized
priv::ensureExtensionsInit();

111
src/SFML/Graphics/Shader.cpp
View File

@ -56,7 +56,8 @@
namespace
{
sf::Mutex mutex;
sf::Mutex maxTextureUnitsMutex;
sf::Mutex isAvailableMutex;
GLint checkMaxTextureUnits()
{
@ -70,7 +71,7 @@ namespace
GLint getMaxTextureUnits()
{
// TODO: Remove this lock when it becomes unnecessary in C++11
sf::Lock lock(mutex);
sf::Lock lock(maxTextureUnitsMutex);
static GLint maxUnits = checkMaxTextureUnits();
@ -116,53 +117,6 @@ namespace
return success;
}
bool checkShadersAvailable()
{
// Create a temporary context in case the user checks
// before a GlResource is created, thus initializing
// the shared context
if (!sf::Context::getActiveContext())
{
sf::Context context;
// Make sure that extensions are initialized
sf::priv::ensureExtensionsInit();
bool available = GLEXT_multitexture &&
GLEXT_shading_language_100 &&
GLEXT_shader_objects &&
GLEXT_vertex_shader &&
GLEXT_fragment_shader;
return available;
}
// Make sure that extensions are initialized
sf::priv::ensureExtensionsInit();
bool available = GLEXT_multitexture &&
GLEXT_shading_language_100 &&
GLEXT_shader_objects &&
GLEXT_vertex_shader &&
GLEXT_fragment_shader;
return available;
}
bool checkGeometryShadersAvailable()
{
// Create a temporary context in case the user checks
// before a GlResource is created, thus initializing
// the shared context
sf::Context context;
// Make sure that extensions are initialized
sf::priv::ensureExtensionsInit();
bool available = checkShadersAvailable() && GLEXT_geometry_shader4;
return available;
}
// Transforms an array of 2D vectors into a contiguous array of scalars
template <typename T>
std::vector<T> flatten(const sf::Vector2<T>* vectorArray, std::size_t length)
@ -236,8 +190,6 @@ struct Shader::UniformBinder : private NonCopyable
{
if (currentProgram)
{
ensureGlContext();
// Enable program object
glCheck(savedProgram = GLEXT_glGetHandle(GLEXT_GL_PROGRAM_OBJECT));
if (currentProgram != savedProgram)
@ -259,9 +211,10 @@ struct Shader::UniformBinder : private NonCopyable
glCheck(GLEXT_glUseProgramObject(savedProgram));
}
GLEXT_GLhandle savedProgram; ///< Handle to the previously active program object
GLEXT_GLhandle currentProgram; ///< Handle to the program object of the modified sf::Shader instance
GLint location; ///< Uniform location, used by the surrounding sf::Shader code
TransientContextLock lock; ///< Lock to keep context active while uniform is bound
GLEXT_GLhandle savedProgram; ///< Handle to the previously active program object
GLEXT_GLhandle currentProgram; ///< Handle to the program object of the modified sf::Shader instance
GLint location; ///< Uniform location, used by the surrounding sf::Shader code
};
@ -278,7 +231,7 @@ m_uniforms ()
////////////////////////////////////////////////////////////
Shader::~Shader()
{
ensureGlContext();
TransientContextLock lock;
// Destroy effect program
if (m_shaderProgram)
@ -592,7 +545,7 @@ void Shader::setUniform(const std::string& name, const Texture& texture)
{
if (m_shaderProgram)
{
ensureGlContext();
TransientContextLock lock;
// Find the location of the variable in the shader
int location = getUniformLocation(name);
@ -627,7 +580,7 @@ void Shader::setUniform(const std::string& name, CurrentTextureType)
{
if (m_shaderProgram)
{
ensureGlContext();
TransientContextLock lock;
// Find the location of the variable in the shader
m_currentTexture = getUniformLocation(name);
@ -787,7 +740,7 @@ unsigned int Shader::getNativeHandle() const
////////////////////////////////////////////////////////////
void Shader::bind(const Shader* shader)
{
ensureGlContext();
TransientContextLock lock;
// Make sure that we can use shaders
if (!isAvailable())
@ -820,10 +773,26 @@ void Shader::bind(const Shader* shader)
////////////////////////////////////////////////////////////
bool Shader::isAvailable()
{
// TODO: Remove this lock when it becomes unnecessary in C++11
Lock lock(mutex);
Lock lock(isAvailableMutex);
static bool available = checkShadersAvailable();
static bool checked = false;
static bool available = false;
if (!checked)
{
checked = true;
TransientContextLock contextLock;
// Make sure that extensions are initialized
sf::priv::ensureExtensionsInit();
available = GLEXT_multitexture &&
GLEXT_shading_language_100 &&
GLEXT_shader_objects &&
GLEXT_vertex_shader &&
GLEXT_fragment_shader;
}
return available;
}
@ -832,10 +801,22 @@ bool Shader::isAvailable()
////////////////////////////////////////////////////////////
bool Shader::isGeometryAvailable()
{
// TODO: Remove this lock when it becomes unnecessary in C++11
Lock lock(mutex);
Lock lock(isAvailableMutex);
static bool available = checkGeometryShadersAvailable();
static bool checked = false;
static bool available = false;
if (!checked)
{
checked = true;
TransientContextLock contextLock;
// Make sure that extensions are initialized
sf::priv::ensureExtensionsInit();
available = isAvailable() && GLEXT_geometry_shader4;
}
return available;
}
@ -844,7 +825,7 @@ bool Shader::isGeometryAvailable()
////////////////////////////////////////////////////////////
bool Shader::compile(const char* vertexShaderCode, const char* geometryShaderCode, const char* fragmentShaderCode)
{
ensureGlContext();
TransientContextLock lock;
// First make sure that we can use shaders
if (!isAvailable())

79
src/SFML/Graphics/Texture.cpp
View File

@ -40,39 +40,19 @@
namespace
{
sf::Mutex mutex;
sf::Mutex idMutex;
sf::Mutex maximumSizeMutex;
// Thread-safe unique identifier generator,
// is used for states cache (see RenderTarget)
sf::Uint64 getUniqueId()
{
sf::Lock lock(mutex);
sf::Lock lock(idMutex);
static sf::Uint64 id = 1; // start at 1, zero is "no texture"
return id++;
}
unsigned int checkMaximumTextureSize()
{
// Create a temporary context in case the user queries
// the size before a GlResource is created, thus
// initializing the shared context
if (!sf::Context::getActiveContext())
{
sf::Context context;
GLint size;
glCheck(glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size));
return static_cast<unsigned int>(size);
}
GLint size;
glCheck(glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size));
return static_cast<unsigned int>(size);
}
}
@ -118,7 +98,7 @@ Texture::~Texture()
// Destroy the OpenGL texture
if (m_texture)
{
ensureGlContext();
TransientContextLock lock;
GLuint texture = static_cast<GLuint>(m_texture);
glCheck(glDeleteTextures(1, &texture));
@ -157,7 +137,7 @@ bool Texture::create(unsigned int width, unsigned int height)
m_pixelsFlipped = false;
m_fboAttachment = false;
ensureGlContext();
TransientContextLock lock;
// Create the OpenGL texture if it doesn't exist yet
if (!m_texture)
@ -265,10 +245,6 @@ bool Texture::loadFromImage(const Image& image, const IntRect& area)
{
update(image);
// Force an OpenGL flush, so that the texture will appear updated
// in all contexts immediately (solves problems in multi-threaded apps)
glCheck(glFlush());
return true;
}
else
@ -290,6 +266,8 @@ bool Texture::loadFromImage(const Image& image, const IntRect& area)
// Create the texture and upload the pixels
if (create(rectangle.width, rectangle.height))
{
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -333,7 +311,7 @@ Image Texture::copyToImage() const
if (!m_texture)
return Image();
ensureGlContext();
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -424,7 +402,7 @@ void Texture::update(const Uint8* pixels, unsigned int width, unsigned int heigh
if (pixels && m_texture)
{
ensureGlContext();
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -436,6 +414,10 @@ void Texture::update(const Uint8* pixels, unsigned int width, unsigned int heigh
m_hasMipmap = false;
m_pixelsFlipped = false;
m_cacheId = getUniqueId();
// Force an OpenGL flush, so that the texture data will appear updated
// in all contexts immediately (solves problems in multi-threaded apps)
glCheck(glFlush());
}
}
@ -470,6 +452,8 @@ void Texture::update(const Window& window, unsigned int x, unsigned int y)
if (m_texture && window.setActive(true))
{
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -480,6 +464,10 @@ void Texture::update(const Window& window, unsigned int x, unsigned int y)
m_hasMipmap = false;
m_pixelsFlipped = true;
m_cacheId = getUniqueId();
// Force an OpenGL flush, so that the texture will appear updated
// in all contexts immediately (solves problems in multi-threaded apps)
glCheck(glFlush());
}
}
@ -493,7 +481,7 @@ void Texture::setSmooth(bool smooth)
if (m_texture)
{
ensureGlContext();
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -544,7 +532,7 @@ void Texture::setRepeated(bool repeated)
if (m_texture)
{
ensureGlContext();
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -586,7 +574,7 @@ bool Texture::generateMipmap()
if (!m_texture)
return false;
ensureGlContext();
TransientContextLock lock;
// Make sure that extensions are initialized
priv::ensureExtensionsInit();
@ -613,7 +601,7 @@ void Texture::invalidateMipmap()
if (!m_hasMipmap)
return;
ensureGlContext();
TransientContextLock lock;
// Make sure that the current texture binding will be preserved
priv::TextureSaver save;
@ -628,7 +616,7 @@ void Texture::invalidateMipmap()
////////////////////////////////////////////////////////////
void Texture::bind(const Texture* texture, CoordinateType coordinateType)
{
ensureGlContext();
TransientContextLock lock;
if (texture && texture->m_texture)
{
@ -684,12 +672,21 @@ void Texture::bind(const Texture* texture, CoordinateType coordinateType)
////////////////////////////////////////////////////////////
unsigned int Texture::getMaximumSize()
{
// TODO: Remove this lock when it becomes unnecessary in C++11
Lock lock(mutex);
Lock lock(maximumSizeMutex);
static unsigned int size = checkMaximumTextureSize();
static bool checked = false;
static GLint size = 0;
return size;
if (!checked)
{
checked = true;
TransientContextLock lock;
glCheck(glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size));
}
return static_cast<unsigned int>(size);
}
@ -722,7 +719,7 @@ unsigned int Texture::getNativeHandle() const
////////////////////////////////////////////////////////////
unsigned int Texture::getValidSize(unsigned int size)
{
ensureGlContext();
TransientContextLock lock;
// Make sure that extensions are initialized
priv::ensureExtensionsInit();

80
src/SFML/Window/Context.cpp
View File

@ -28,24 +28,6 @@
#include <SFML/Window/Context.hpp>
#include <SFML/Window/GlContext.hpp>
#include <SFML/System/ThreadLocalPtr.hpp>
#include <SFML/OpenGL.hpp>
#include <algorithm>
#include <vector>
#include <string>
#if defined(SFML_SYSTEM_WINDOWS)
typedef const GLubyte* (APIENTRY *glGetStringiFuncType)(GLenum, GLuint);
#else
typedef const GLubyte* (*glGetStringiFuncType)(GLenum, GLuint);
#endif
#if !defined(GL_NUM_EXTENSIONS)
#define GL_NUM_EXTENSIONS 0x821D
#endif
namespace
@ -99,70 +81,16 @@ const Context* Context::getActiveContext()
////////////////////////////////////////////////////////////
GlFunctionPointer Context::getFunction(const char* name)
bool Context::isExtensionAvailable(const char* name)
{
return priv::GlContext::getFunction(name);
return priv::GlContext::isExtensionAvailable(name);
}
////////////////////////////////////////////////////////////
bool Context::isExtensionAvailable(const char* name)
GlFunctionPointer Context::getFunction(const char* name)
{
static std::vector<std::string> extensions;
static bool loaded = false;
if (!loaded)
{
const Context* context = getActiveContext();
if (!context)
return false;
const char* extensionString = NULL;
if(context->getSettings().majorVersion < 3)
{
// Try to load the < 3.0 way
extensionString = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
do
{
const char* extension = extensionString;
while(*extensionString && (*extensionString != ' '))
extensionString++;
extensions.push_back(std::string(extension, extensionString));
}
while (*extensionString++);
}
else
{
// Try to load the >= 3.0 way
glGetStringiFuncType glGetStringiFunc = NULL;
glGetStringiFunc = reinterpret_cast<glGetStringiFuncType>(getFunction("glGetStringi"));
if (glGetStringiFunc)
{
int numExtensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
if (numExtensions)
{
for (unsigned int i = 0; i < static_cast<unsigned int>(numExtensions); ++i)
{
extensionString = reinterpret_cast<const char*>(glGetStringiFunc(GL_EXTENSIONS, i));
extensions.push_back(extensionString);
}
}
}
}
loaded = true;
}
return std::find(extensions.begin(), extensions.end(), name) != extensions.end();
return priv::GlContext::getFunction(name);
}

10
src/SFML/Window/EglContext.cpp
View File

@ -173,9 +173,12 @@ EglContext::~EglContext()
////////////////////////////////////////////////////////////
bool EglContext::makeCurrent()
bool EglContext::makeCurrent(bool current)
{
return m_surface != EGL_NO_SURFACE && eglCheck(eglMakeCurrent(m_display, m_surface, m_surface, m_context));
if (current)
return m_surface != EGL_NO_SURFACE && eglCheck(eglMakeCurrent(m_display, m_surface, m_surface, m_context));
return m_surface != EGL_NO_SURFACE && eglCheck(eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT));
}
@ -209,6 +212,9 @@ void EglContext::createContext(EglContext* shared)
else
toShared = EGL_NO_CONTEXT;
if (toShared != EGL_NO_CONTEXT)
eglMakeCurrent(m_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
// Create EGL context
m_context = eglCheck(eglCreateContext(m_display, m_config, toShared, contextVersion));
}

4
src/SFML/Window/EglContext.hpp
View File

@ -83,10 +83,12 @@ public:
/// \brief Activate the context as the current target
/// for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent();
virtual bool makeCurrent(bool current);
////////////////////////////////////////////////////////////
/// \brief Display what has been rendered to the context so far

206
src/SFML/Window/GlContext.cpp
View File

@ -31,9 +31,13 @@
#include <SFML/System/Lock.hpp>
#include <SFML/System/Err.hpp>
#include <SFML/OpenGL.hpp>
#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <cstdlib>
#include <cstring>
#include <cassert>
#if !defined(SFML_OPENGL_ES)
@ -126,6 +130,8 @@ namespace
// AMD drivers have issues with internal synchronization
// We need to make sure that no operating system context
// or pixel format operations are performed simultaneously
// This mutex is also used to protect the shared context
// from being locked on multiple threads
sf::Mutex mutex;
// This per-thread variable holds the current context for each thread
@ -134,35 +140,12 @@ namespace
// The hidden, inactive context that will be shared with all other contexts
ContextType* sharedContext = NULL;
// Internal contexts
sf::ThreadLocalPtr<sf::Context> internalContext(NULL);
std::set<sf::Context*> internalContexts;
sf::Mutex internalContextsMutex;
// This per-thread variable is set to point to the shared context
// if we had to acquire it when a TransientContextLock was required
sf::ThreadLocalPtr<sf::priv::GlContext> currentSharedContext(NULL);
// Check if the internal context of the current thread is valid
bool hasInternalContext()
{
// The internal context can be null...
if (!internalContext)
return false;
// ... or non-null but deleted from the list of internal contexts
sf::Lock lock(internalContextsMutex);
return internalContexts.find(internalContext) != internalContexts.end();
}
// Retrieve the internal context for the current thread
sf::Context* getInternalContext()
{
if (!hasInternalContext())
{
internalContext = new sf::Context;
sf::Lock lock(internalContextsMutex);
internalContexts.insert(internalContext);
}
return internalContext;
}
// Supported OpenGL extensions
std::vector<std::string> extensions;
}
@ -182,9 +165,53 @@ void GlContext::globalInit()
sharedContext = new ContextType(NULL);
sharedContext->initialize(ContextSettings());
// This call makes sure that:
// - the shared context is inactive (it must never be)
// - another valid context is activated in the current thread
// Load our extensions vector
extensions.clear();
// Check whether a >= 3.0 context is available
int majorVersion = 0;
glGetIntegerv(GL_MAJOR_VERSION, &majorVersion);
if (glGetError() == GL_INVALID_ENUM)
{
// Try to load the < 3.0 way
const char* extensionString = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
do
{
const char* extension = extensionString;
while(*extensionString && (*extensionString != ' '))
extensionString++;
extensions.push_back(std::string(extension, extensionString));
}
while (*extensionString++);
}
else
{
// Try to load the >= 3.0 way
glGetStringiFuncType glGetStringiFunc = NULL;
glGetStringiFunc = reinterpret_cast<glGetStringiFuncType>(getFunction("glGetStringi"));
if (glGetStringiFunc)
{
int numExtensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);
if (numExtensions)
{
for (unsigned int i = 0; i < static_cast<unsigned int>(numExtensions); ++i)
{
const char* extensionString = reinterpret_cast<const char*>(glGetStringiFunc(GL_EXTENSIONS, i));
extensions.push_back(extensionString);
}
}
}
}
// Deactivate the shared context so that others can activate it when necessary
sharedContext->setActive(false);
}
@ -200,31 +227,59 @@ void GlContext::globalCleanup()
// Destroy the shared context
delete sharedContext;
sharedContext = NULL;
// Destroy the internal contexts
Lock internalContextsLock(internalContextsMutex);
for (std::set<Context*>::iterator it = internalContexts.begin(); it != internalContexts.end(); ++it)
delete *it;
internalContexts.clear();
}
////////////////////////////////////////////////////////////
void GlContext::ensureContext()
void GlContext::acquireTransientContext()
{
// If there's no active context on the current thread, activate an internal one
if (!currentContext)
getInternalContext()->setActive(true);
// If a capable context is already active on this thread
// there is no need to use the shared context for the operation
if (currentContext)
{
currentSharedContext = NULL;
return;
}
mutex.lock();
currentSharedContext = sharedContext;
sharedContext->setActive(true);
}
////////////////////////////////////////////////////////////
void GlContext::releaseTransientContext()
{
if (!currentSharedContext)
return;
sharedContext->setActive(false);
mutex.unlock();
}
////////////////////////////////////////////////////////////
GlContext* GlContext::create()
{
// Make sure that there's an active context (context creation may need extensions, and thus a valid context)
assert(sharedContext != NULL);
Lock lock(mutex);
// Create the context
GlContext* context = new ContextType(sharedContext);
GlContext* context = NULL;
// We don't use acquireTransientContext here since we have
// to ensure we have exclusive access to the shared context
// in order to make sure it is not active during context creation
{
sharedContext->setActive(true);
// Create the context
context = new ContextType(sharedContext);
sharedContext->setActive(false);
}
context->initialize(ContextSettings());
return context;
@ -235,12 +290,24 @@ GlContext* GlContext::create()
GlContext* GlContext::create(const ContextSettings& settings, const WindowImpl* owner, unsigned int bitsPerPixel)
{
// Make sure that there's an active context (context creation may need extensions, and thus a valid context)
ensureContext();
assert(sharedContext != NULL);
Lock lock(mutex);
// Create the context
GlContext* context = new ContextType(sharedContext, settings, owner, bitsPerPixel);
GlContext* context = NULL;
// We don't use acquireTransientContext here since we have
// to ensure we have exclusive access to the shared context
// in order to make sure it is not active during context creation
{
sharedContext->setActive(true);
// Create the context
context = new ContextType(sharedContext, settings, owner, bitsPerPixel);
sharedContext->setActive(false);
}
context->initialize(settings);
context->checkSettings(settings);
@ -252,12 +319,24 @@ GlContext* GlContext::create(const ContextSettings& settings, const WindowImpl*
GlContext* GlContext::create(const ContextSettings& settings, unsigned int width, unsigned int height)
{
// Make sure that there's an active context (context creation may need extensions, and thus a valid context)
ensureContext();
assert(sharedContext != NULL);
Lock lock(mutex);
// Create the context
GlContext* context = new ContextType(sharedContext, settings, width, height);
GlContext* context = NULL;
// We don't use acquireTransientContext here since we have
// to ensure we have exclusive access to the shared context
// in order to make sure it is not active during context creation
{
sharedContext->setActive(true);
// Create the context
context = new ContextType(sharedContext, settings, width, height);
sharedContext->setActive(false);
}
context->initialize(settings);
context->checkSettings(settings);
@ -265,6 +344,13 @@ GlContext* GlContext::create(const ContextSettings& settings, unsigned int width
}
////////////////////////////////////////////////////////////
bool GlContext::isExtensionAvailable(const char* name)
{
return std::find(extensions.begin(), extensions.end(), name) != extensions.end();
}
////////////////////////////////////////////////////////////
GlFunctionPointer GlContext::getFunction(const char* name)
{
@ -287,7 +373,10 @@ GlContext::~GlContext()
{
// Deactivate the context before killing it, unless we're inside Cleanup()
if (sharedContext)
setActive(false);
{
if (this == currentContext)
currentContext = NULL;
}
}
@ -308,7 +397,7 @@ bool GlContext::setActive(bool active)
Lock lock(mutex);
// Activate the context
if (makeCurrent())
if (makeCurrent(true))
{
// Set it as the new current context for this thread
currentContext = this;
@ -329,9 +418,18 @@ bool GlContext::setActive(bool active)
{
if (this == currentContext)
{
// To deactivate the context, we actually activate another one so that we make
// sure that there is always an active context for subsequent graphics operations
return getInternalContext()->setActive(true);
Lock lock(mutex);
// Deactivate the context
if (makeCurrent(false))
{
currentContext = NULL;
return true;
}
else
{
return false;
}
}
else
{

24
src/SFML/Window/GlContext.hpp
View File

@ -73,10 +73,16 @@ public:
static void globalCleanup();
////////////////////////////////////////////////////////////
/// \brief Ensures that an OpenGL context is active in the current thread
/// \brief Acquires a context for short-term use on the current thread
///
////////////////////////////////////////////////////////////
static void ensureContext();
static void acquireTransientContext();
////////////////////////////////////////////////////////////
/// \brief Releases a context after short-term use on the current thread
///
////////////////////////////////////////////////////////////
static void releaseTransientContext();
////////////////////////////////////////////////////////////
/// \brief Create a new context, not associated to a window
@ -120,6 +126,16 @@ public:
static GlContext* create(const ContextSettings& settings, unsigned int width, unsigned int height);
public:
////////////////////////////////////////////////////////////
/// \brief Check whether a given OpenGL extension is available
///
/// \param name Name of the extension to check for
///
/// \return True if available, false if unavailable
///
////////////////////////////////////////////////////////////
static bool isExtensionAvailable(const char* name);
////////////////////////////////////////////////////////////
/// \brief Get the address of an OpenGL function
///
@ -197,10 +213,12 @@ protected:
/// \brief Activate the context as the current target
/// for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent() = 0;
virtual bool makeCurrent(bool current) = 0;
////////////////////////////////////////////////////////////
/// \brief Evaluate a pixel format configuration

46
src/SFML/Window/GlResource.cpp
View File

@ -27,6 +27,7 @@
////////////////////////////////////////////////////////////
#include <SFML/Window/GlResource.hpp>
#include <SFML/Window/GlContext.hpp>
#include <SFML/Window/Context.hpp>
#include <SFML/System/Mutex.hpp>
#include <SFML/System/Lock.hpp>
@ -44,20 +45,15 @@ namespace sf
////////////////////////////////////////////////////////////
GlResource::GlResource()
{
{
// Protect from concurrent access
Lock lock(mutex);
// Protect from concurrent access
Lock lock(mutex);
// If this is the very first resource, trigger the global context initialization
if (count == 0)
priv::GlContext::globalInit();
// If this is the very first resource, trigger the global context initialization
if (count == 0)
priv::GlContext::globalInit();
// Increment the resources counter
count++;
}
// Now make sure that there is an active OpenGL context in the current thread
priv::GlContext::ensureContext();
// Increment the resources counter
count++;
}
@ -77,9 +73,31 @@ GlResource::~GlResource()
////////////////////////////////////////////////////////////
void GlResource::ensureGlContext()
GlResource::TransientContextLock::TransientContextLock() :
m_context(0)
{
priv::GlContext::ensureContext();
Lock lock(mutex);
if (count == 0)
{
m_context = new Context;
return;
}
priv::GlContext::acquireTransientContext();
}
////////////////////////////////////////////////////////////
GlResource::TransientContextLock::~TransientContextLock()
{
if (m_context)
{
delete m_context;
return;
}
priv::GlContext::releaseTransientContext();
}
} // namespace sf

4
src/SFML/Window/OSX/SFContext.hpp
View File

@ -137,10 +137,12 @@ protected:
/// \brief Activate the context as the current target
/// for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent();
virtual bool makeCurrent(bool current);
private:
////////////////////////////////////////////////////////////

29
src/SFML/Window/OSX/SFContext.mm
View File

@ -104,6 +104,10 @@ m_window(0)
SFContext::~SFContext()
{
[m_context clearDrawable];
if (m_context == [NSOpenGLContext currentContext])
[NSOpenGLContext clearCurrentContext];
[m_context release];
[m_view release]; // Might be nil but we don't care.
@ -124,10 +128,18 @@ GlFunctionPointer SFContext::getFunction(const char* name)
////////////////////////////////////////////////////////////
bool SFContext::makeCurrent()
bool SFContext::makeCurrent(bool current)
{
[m_context makeCurrentContext];
return m_context == [NSOpenGLContext currentContext]; // Should be true.
if (current)
{
[m_context makeCurrentContext];
return m_context == [NSOpenGLContext currentContext]; // Should be true.
}
else
{
[NSOpenGLContext clearCurrentContext];
return m_context != [NSOpenGLContext currentContext]; // Should be true.
}
}
@ -257,6 +269,17 @@ void SFContext::createContext(SFContext* shared,
// Use the shared context if one is given.
NSOpenGLContext* sharedContext = shared != NULL ? shared->m_context : nil;
if (sharedContext != nil)
{
[NSOpenGLContext clearCurrentContext];
if (sharedContext == [NSOpenGLContext currentContext])
{
sf::err() << "Failed to deactivate shared context before sharing" << std::endl;
return;
}
}
// Create the context.
m_context = [[NSOpenGLContext alloc] initWithFormat:pixFmt
shareContext:sharedContext];

7
src/SFML/Window/Unix/Display.cpp
View File

@ -26,6 +26,8 @@
// Headers
////////////////////////////////////////////////////////////
#include <SFML/System/Err.hpp>
#include <SFML/System/Mutex.hpp>
#include <SFML/System/Lock.hpp>
#include <SFML/Window/Unix/Display.hpp>
#include <X11/keysym.h>
#include <cassert>
@ -38,6 +40,7 @@ namespace
// The shared display and its reference counter
Display* sharedDisplay = NULL;
unsigned int referenceCount = 0;
sf::Mutex mutex;
typedef std::map<std::string, Atom> AtomMap;
AtomMap atoms;
@ -50,6 +53,8 @@ namespace priv
////////////////////////////////////////////////////////////
Display* OpenDisplay()
{
Lock lock(mutex);
if (referenceCount == 0)
{
sharedDisplay = XOpenDisplay(NULL);
@ -71,6 +76,8 @@ Display* OpenDisplay()
////////////////////////////////////////////////////////////
void CloseDisplay(Display* display)
{
Lock lock(mutex);
assert(display == sharedDisplay);
referenceCount--;

35
src/SFML/Window/Unix/GlxContext.cpp
View File

@ -211,7 +211,7 @@ GlFunctionPointer GlxContext::getFunction(const char* name)
////////////////////////////////////////////////////////////
bool GlxContext::makeCurrent()
bool GlxContext::makeCurrent(bool current)
{
if (!m_context)
return false;
@ -222,13 +222,20 @@ bool GlxContext::makeCurrent()
bool result = false;
if (m_pbuffer)
if (current)
{
result = glXMakeContextCurrent(m_display, m_pbuffer, m_pbuffer, m_context);
if (m_pbuffer)
{
result = glXMakeContextCurrent(m_display, m_pbuffer, m_pbuffer, m_context);
}
else if (m_window)
{
result = glXMakeCurrent(m_display, m_window, m_context);
}
}
else if (m_window)
else
{
result = glXMakeCurrent(m_display, m_window, m_context);
result = glXMakeCurrent(m_display, None, NULL);
}
#if defined(GLX_DEBUGGING)
@ -686,6 +693,15 @@ void GlxContext::createContext(GlxContext* shared)
// On an error, glXCreateContextAttribsARB will return 0 anyway
GlxErrorHandler handler(m_display);
if (toShare)
{
if (!glXMakeCurrent(m_display, None, NULL))
{
err() << "Failed to deactivate shared context before sharing" << std::endl;
return;
}
}
// Create the context
m_context = glXCreateContextAttribsARB(m_display, *config, toShare, true, &attributes[0]);
@ -732,6 +748,15 @@ void GlxContext::createContext(GlxContext* shared)
GlxErrorHandler handler(m_display);
#endif
if (toShare)
{
if (!glXMakeCurrent(m_display, None, NULL))
{
err() << "Failed to deactivate shared context before sharing" << std::endl;
return;
}
}
// Create the context, using the target window's visual
m_context = glXCreateContext(m_display, visualInfo, toShare, true);

4
src/SFML/Window/Unix/GlxContext.hpp
View File

@ -94,10 +94,12 @@ public:
////////////////////////////////////////////////////////////
/// \brief Activate the context as the current target for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent();
virtual bool makeCurrent(bool current);
////////////////////////////////////////////////////////////
/// \brief Display what has been rendered to the context so far

22
src/SFML/Window/Win32/WglContext.cpp
View File

@ -200,9 +200,9 @@ GlFunctionPointer WglContext::getFunction(const char* name)
////////////////////////////////////////////////////////////
bool WglContext::makeCurrent()
bool WglContext::makeCurrent(bool current)
{
return m_deviceContext && m_context && wglMakeCurrent(m_deviceContext, m_context);
return m_deviceContext && m_context && wglMakeCurrent(current ? m_deviceContext : NULL, current ? m_context : NULL);
}
@ -599,6 +599,18 @@ void WglContext::createContext(WglContext* shared)
attributes.push_back(0);
attributes.push_back(0);
if (sharedContext)
{
static Mutex mutex;
Lock lock(mutex);
if (!wglMakeCurrent(NULL, NULL))
{
err() << "Failed to deactivate shared context before sharing: " << getErrorString(GetLastError()).toAnsiString() << std::endl;
return;
}
}
// Create the context
m_context = wglCreateContextAttribsARB(m_deviceContext, sharedContext, &attributes[0]);
}
@ -657,6 +669,12 @@ void WglContext::createContext(WglContext* shared)
static Mutex mutex;
Lock lock(mutex);
if (!wglMakeCurrent(NULL, NULL))
{
err() << "Failed to deactivate shared context before sharing: " << getErrorString(GetLastError()).toAnsiString() << std::endl;
return;
}
if (!wglShareLists(sharedContext, m_context))
err() << "Failed to share the OpenGL context: " << getErrorString(GetLastError()).toAnsiString() << std::endl;
}

4
src/SFML/Window/Win32/WglContext.hpp
View File

@ -93,10 +93,12 @@ public:
////////////////////////////////////////////////////////////
/// \brief Activate the context as the current target for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent();
virtual bool makeCurrent(bool current);
////////////////////////////////////////////////////////////
/// \brief Display what has been rendered to the context so far

4
src/SFML/Window/iOS/EaglContext.hpp
View File

@ -126,10 +126,12 @@ protected:
/// \brief Activate the context as the current target
/// for rendering
///
/// \param current Whether to make the context current or no longer current
///
/// \return True on success, false if any error happened
///
////////////////////////////////////////////////////////////
virtual bool makeCurrent();
virtual bool makeCurrent(bool current);
private:

21
src/SFML/Window/iOS/EaglContext.mm
View File

@ -107,6 +107,9 @@ EaglContext::~EaglContext()
// Restore the previous context
[EAGLContext setCurrentContext:previousContext];
if (m_context == [EAGLContext currentContext])
[EAGLContext setCurrentContext:nil];
}
}
@ -167,9 +170,12 @@ void EaglContext::recreateRenderBuffers(SFView* glView)
////////////////////////////////////////////////////////////
bool EaglContext::makeCurrent()
bool EaglContext::makeCurrent(bool current)
{
return [EAGLContext setCurrentContext:m_context];
if (current)
return [EAGLContext setCurrentContext:m_context];
return [EAGLContext setCurrentContext:nil];
}
@ -215,12 +221,18 @@ void EaglContext::createContext(EaglContext* shared,
// Create the context
if (shared)
{
[EAGLContext setCurrentContext:nil];
m_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1 sharegroup:[shared->m_context sharegroup]];
}
else
{
m_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1];
}
// Activate it
makeCurrent();
makeCurrent(true);
// Create the framebuffer (this is the only allowed drawable on iOS)
glGenFramebuffersOES(1, &m_framebuffer);
@ -230,6 +242,9 @@ void EaglContext::createContext(EaglContext* shared,
// Attach the context to the GL view for future updates
window->getGlView().context = this;
// Deactivate it
makeCurrent(false);
}
} // namespace priv