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plugins/platforms/x11/common/eglonxbackend.cpp
| Show First 20 Lines • Show All 115 Lines • ▼ Show 20 Line(s) | 115 | if (error != EGL_SUCCESS && error != EGL_BAD_ATTRIBUTE) { | |||
|---|---|---|---|---|---|
| 116 | setFailed(QStringLiteral("query surface failed")); | 116 | setFailed(QStringLiteral("query surface failed")); | ||
| 117 | return; | 117 | return; | ||
| 118 | } else { | 118 | } else { | ||
| 119 | surfaceHasSubPost = EGL_FALSE; | 119 | surfaceHasSubPost = EGL_FALSE; | ||
| 120 | } | 120 | } | ||
| 121 | } | 121 | } | ||
| 122 | } | 122 | } | ||
| 123 | 123 | | |||
| 124 | setSyncsToVBlank(false); | | |||
| 125 | setBlocksForRetrace(true); | 124 | setBlocksForRetrace(true); | ||
| 126 | if (surfaceHasSubPost) { | 125 | if (surfaceHasSubPost) { | ||
| 127 | qCDebug(KWIN_CORE) << "EGL implementation and surface support eglPostSubBufferNV, let's use it"; | 126 | qCDebug(KWIN_CORE) << "EGL implementation and surface support eglPostSubBufferNV, let's use it"; | ||
| 128 | 127 | | |||
| 129 | if (options->glPreferBufferSwap() != Options::NoSwapEncourage) { | | |||
| 130 | // check if swap interval 1 is supported | 128 | // check if swap interval 1 is supported | ||
| 131 | EGLint val; | 129 | EGLint val; | ||
| 132 | eglGetConfigAttrib(eglDisplay(), config(), EGL_MAX_SWAP_INTERVAL, &val); | 130 | eglGetConfigAttrib(eglDisplay(), config(), EGL_MAX_SWAP_INTERVAL, &val); | ||
| 133 | if (val >= 1) { | 131 | if (val >= 1) { | ||
| 134 | if (eglSwapInterval(eglDisplay(), 1)) { | 132 | if (eglSwapInterval(eglDisplay(), 1)) { | ||
| 135 | qCDebug(KWIN_CORE) << "Enabled v-sync"; | 133 | qCDebug(KWIN_CORE) << "Enabled v-sync"; | ||
| 136 | setSyncsToVBlank(true); | | |||
| 137 | } | 134 | } | ||
| 138 | } else { | 135 | } else { | ||
| 139 | qCWarning(KWIN_CORE) << "Cannot enable v-sync as max. swap interval is" << val; | 136 | qCWarning(KWIN_CORE) << "Cannot enable v-sync as max. swap interval is" << val; | ||
| 140 | } | 137 | } | ||
| 141 | } else { | 138 | | ||
| 142 | // disable v-sync | | |||
| 143 | eglSwapInterval(eglDisplay(), 0); | | |||
| 144 | } | | |||
| 145 | } else { | 139 | } else { | ||
| 146 | /* In the GLX backend, we fall back to using glCopyPixels if we have no extension providing support for partial screen updates. | 140 | /* In the GLX backend, we fall back to using glCopyPixels if we have no extension providing support for partial screen updates. | ||
| 147 | * However, that does not work in EGL - glCopyPixels with glDrawBuffer(GL_FRONT); does nothing. | 141 | * However, that does not work in EGL - glCopyPixels with glDrawBuffer(GL_FRONT); does nothing. | ||
| 148 | * Hence we need EGL to preserve the backbuffer for us, so that we can draw the partial updates on it and call | 142 | * Hence we need EGL to preserve the backbuffer for us, so that we can draw the partial updates on it and call | ||
| 149 | * eglSwapBuffers() for each frame. eglSwapBuffers() then does the copy (no page flip possible in this mode), | 143 | * eglSwapBuffers() for each frame. eglSwapBuffers() then does the copy (no page flip possible in this mode), | ||
| 150 | * which means it is slow and not synced to the v-blank. */ | 144 | * which means it is slow and not synced to the v-blank. */ | ||
| 151 | qCWarning(KWIN_CORE) << "eglPostSubBufferNV not supported, have to enable buffer preservation - which breaks v-sync and performance"; | 145 | qCWarning(KWIN_CORE) << "eglPostSubBufferNV not supported, have to enable buffer preservation - which breaks v-sync and performance"; | ||
| 152 | eglSurfaceAttrib(eglDisplay(), surface(), EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED); | 146 | eglSurfaceAttrib(eglDisplay(), surface(), EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED); | ||
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