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[iOS] Added (fake) implementation of vertical synchronization

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This commit is contained in:
Laurent Gomila 2013-11-08 14:49:58 +01:00 committed by Jonathan De Wachter
parent cd89e462fa
commit 728f11701b
2 changed files with 33 additions and 12 deletions
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3
src/SFML/Window/iOS/EaglContext.hpp
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@ -31,6 +31,7 @@
#include <SFML/Window/GlContext.hpp> #include <SFML/Window/GlContext.hpp>
#include <SFML/Window/iOS/ObjCType.hpp> #include <SFML/Window/iOS/ObjCType.hpp>
#include <SFML/System/Vector2.hpp> #include <SFML/System/Vector2.hpp>
#include <SFML/System/Clock.hpp>
#include <OpenGLES/ES1/gl.h> #include <OpenGLES/ES1/gl.h>
@ -153,6 +154,8 @@ private:
GLuint m_framebuffer; ///< Frame buffer associated to the context GLuint m_framebuffer; ///< Frame buffer associated to the context
GLuint m_colorbuffer; ///< Color render buffer GLuint m_colorbuffer; ///< Color render buffer
GLuint m_depthbuffer; ///< Depth render buffer GLuint m_depthbuffer; ///< Depth render buffer
bool m_vsyncEnabled; ///< Vertical sync activation flag
Clock m_clock; ///< Measures the elapsed time for the fake v-sync implementation
}; };
} // namespace priv } // namespace priv

24
src/SFML/Window/iOS/EaglContext.mm
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@ -29,6 +29,7 @@
#include <SFML/Window/iOS/WindowImplUIKit.hpp> #include <SFML/Window/iOS/WindowImplUIKit.hpp>
#include <SFML/Window/iOS/SFView.hpp> #include <SFML/Window/iOS/SFView.hpp>
#include <SFML/System/Err.hpp> #include <SFML/System/Err.hpp>
#include <SFML/System/Sleep.hpp>
#include <OpenGLES/EAGL.h> #include <OpenGLES/EAGL.h>
#include <OpenGLES/EAGLDrawable.h> #include <OpenGLES/EAGLDrawable.h>
#include <OpenGLES/ES1/glext.h> #include <OpenGLES/ES1/glext.h>
@ -44,7 +45,9 @@ EaglContext::EaglContext(EaglContext* shared) :
m_context (nil), m_context (nil),
m_framebuffer (0), m_framebuffer (0),
m_colorbuffer (0), m_colorbuffer (0),
m_depthbuffer(0) m_depthbuffer (0),
m_vsyncEnabled(false),
m_clock ()
{ {
// Create the context // Create the context
if (shared) if (shared)
@ -60,7 +63,9 @@ EaglContext::EaglContext(EaglContext* shared, const ContextSettings& settings,
m_context (nil), m_context (nil),
m_framebuffer (0), m_framebuffer (0),
m_colorbuffer (0), m_colorbuffer (0),
m_depthbuffer(0) m_depthbuffer (0),
m_vsyncEnabled(false),
m_clock ()
{ {
const WindowImplUIKit* window = static_cast<const WindowImplUIKit*>(owner); const WindowImplUIKit* window = static_cast<const WindowImplUIKit*>(owner);
@ -74,7 +79,9 @@ EaglContext::EaglContext(EaglContext* shared, const ContextSettings& settings,
m_context (nil), m_context (nil),
m_framebuffer (0), m_framebuffer (0),
m_colorbuffer (0), m_colorbuffer (0),
m_depthbuffer(0) m_depthbuffer (0),
m_vsyncEnabled(false),
m_clock ()
{ {
// This constructor shoult never be used by implementation // This constructor shoult never be used by implementation
err() << "Calling bad EaglContext constructor, please contact your developer :)" << std::endl; err() << "Calling bad EaglContext constructor, please contact your developer :)" << std::endl;
@ -167,12 +174,23 @@ void EaglContext::display()
{ {
glBindRenderbufferOES(GL_RENDERBUFFER_OES, m_colorbuffer); glBindRenderbufferOES(GL_RENDERBUFFER_OES, m_colorbuffer);
[m_context presentRenderbuffer:GL_RENDERBUFFER_OES]; [m_context presentRenderbuffer:GL_RENDERBUFFER_OES];
// The proper way of doing v-sync on iOS would be to use CADisplayLink
// notifications, but it is not compatible with the way SFML is designed;
// therefore we fake it with a manual framerate limit
if (m_vsyncEnabled)
{
static const Time frameDuration = seconds(1.f / 60.f);
sleep(frameDuration - m_clock.getElapsedTime());
m_clock.restart();
}
} }
//////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////
void EaglContext::setVerticalSyncEnabled(bool enabled) void EaglContext::setVerticalSyncEnabled(bool enabled)
{ {
m_vsyncEnabled = enabled;
} }