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Refined API doc getDefaultReadBuffer() ; Add GLDrawableUtil.swapBuffersBeforeRead(..)\u000a\u000aCommit 82f679b064784213591b460fc5eaa1f5f196fbd1 which introduces the default swap-buffers\u000amechanism is erroneous:\u000a\u000aThe OffscreenBack backend requires the following operation order:\u000a\u000aOrder-1:\u000a [1] - GL display\u000a [2] - GL swapBuffers (always due to single-buffer non-MSAA or MSAA offscreen drawable)\u000a [3] - readPixels\u000a\u000a+++\u000a\u000aCommit 82f679b064784213591b460fc5eaa1f5f196fbd1 however introduced:\u000a\u000aOrder-2:\u000a [a] - GL display\u000a [b] - readPixels\u000a [c] - GL swapBuffers (always due to single-buffer non-MSAA or MSAA offscreen drawable)\u000a\u000asince [a] and [b] happened in Updater's display method, and [c] followed the same\u000atriggered by GLAutoDrawableHelper.\u000a\u000a+++\u000a\u000aThe proof, commit d46d9ad8f998a7128d9f023294d5f489673d6d8a, is faulty,\u000asince it always included the 'snapshot' GL event listener\u000awhich turned-off auto-swap and swapped before read-pixels.\u000aTL;DR it enforced proper Order-1.\u000a\u000a+++\u000a\u000aThis fix allows the Backend to intercept disable GLDrawableHelper's setAutoSwapBufferMode(..)\u000aand perform the auto-swap mode itself in the proper Order-1.\u000a\u000aThe unit test has been refined to optionally disable the snapshot\u000ato validate auto-swap mode.\u000a\u000a+++\u000a\u000aRefined GLBase and GLContext's API doc for 'getDefaultReadBuffer()'\u000a\u000a+++\u000a\u000aAdd GLDrawableUtil.swapBuffersBeforeRead(..)\u000aand reuse it for TileRendererBase (original impl.).\u000a", "date" : "2014-02-18T20:47:06+0100", "id" : "41190c3830157abdf9649cbf7767e57108f55075", "msg" : "Bug 975 - GLJPanel's OffscreenDrawable shall not double swap - Fix", "paths" : [ { "editType" : "edit", "file" : "src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java" }, { "editType" : "edit", "file" : "src/jogl/classes/com/jogamp/opengl/util/TileRendererBase.java" }, { "editType" : "edit", "file" : "src/test/com/jogamp/opengl/test/junit/jogl/acore/TestGLReadBuffer01GLJPanelAWT.java" }, { "editType" : "edit", "file" : "src/test/com/jogamp/opengl/test/junit/jogl/acore/TestGLReadBuffer01GLWindowNEWT.java" }, { "editType" : "edit", "file" : "src/jogl/classes/javax/media/opengl/awt/GLJPanel.java" }, { "editType" : "edit", "file" : "src/jogl/classes/javax/media/opengl/GLBase.java" }, { "editType" : "edit", "file" : "src/jogl/classes/javax/media/opengl/GLContext.java" }, { "editType" : "edit", "file" : "src/test/com/jogamp/opengl/test/junit/util/UITestCase.java" } ] }, { "_class" : "hudson.plugins.git.GitChangeSet", "affectedPaths" : [ "src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java", "src/jogl/classes/jogamp/opengl/GLContextImpl.java", "src/jogl/classes/jogamp/opengl/GLDrawableImpl.java" ], "commitId" : "b96fc594f15fcf9ee0fd238ce8d7a10aea781d32", "timestamp" : 1392752977000, "author" : { "absoluteUrl" : "https://jogamp.org/chuck/user/sven%20gothel", "fullName" : "Sven Gothel" }, "authorEmail" : "sgothel@jausoft.com", "comment" : "GLContextImpl/GLDrawableImpl.getDefaultReadBuffer(..): Pass hint whether dedicated read-drawable is being used (double buffering)\u000a", "date" : "2014-02-18T20:49:37+0100", "id" : "b96fc594f15fcf9ee0fd238ce8d7a10aea781d32", "msg" : "GLContextImpl/GLDrawableImpl.getDefaultReadBuffer(..): Pass hint whether", "paths" : [ { "editType" : "edit", "file" : "src/jogl/classes/jogamp/opengl/GLFBODrawableImpl.java" }, { "editType" : "edit", "file" : "src/jogl/classes/jogamp/opengl/GLContextImpl.java" }, { "editType" : "edit", "file" : "src/jogl/classes/jogamp/opengl/GLDrawableImpl.java" } ] } ], "kind" : "git" }, "culprits" : [ { "absoluteUrl" : "https://jogamp.org/chuck/user/sgothel", "fullName" : "Sven Gothel" } ] }