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-rw-r--r--src/jogl/classes/javax/media/opengl/awt/GLJPanel.java6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
index e2ccc1097..cfb11a2b0 100644
--- a/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
+++ b/src/jogl/classes/javax/media/opengl/awt/GLJPanel.java
@@ -1636,6 +1636,11 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
helper.setAutoSwapBufferMode(false); // we handle swap-buffers, see handlesSwapBuffer()
final GL gl = offscreenContext.getGL();
+ // Remedy for Bug 1020, i.e. OSX/Nvidia's FBO needs to be cleared before blitting,
+ // otherwise first MSAA frame lacks antialiasing.
+ // Clearing of FBO is performed within GLFBODrawableImpl.initialize(..):
+ // gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
+
final GLCapabilitiesImmutable chosenCaps = offscreenDrawable.getChosenGLCapabilities();
final boolean glslCompliant = !offscreenContext.hasRendererQuirk(GLRendererQuirks.GLSLNonCompliant);
final boolean useGLSLFlip = useGLSLFlip_pre && gl.isGL2ES2() && glslCompliant;
@@ -1653,6 +1658,7 @@ public class GLJPanel extends JPanel implements AWTGLAutoDrawable, WindowClosing
fboFlipped.reset(gl, fboDrawable.getSurfaceWidth(), fboDrawable.getSurfaceHeight(), 0, false);
fboFlipped.attachColorbuffer(gl, 0, chosenCaps.getAlphaBits()>0);
// fboFlipped.attachRenderbuffer(gl, Attachment.Type.DEPTH, 24);
+ gl.glClear(GL.GL_COLOR_BUFFER_BIT); // Bug 1020 (see above), cannot do in FBObject due to unknown 'first bind' state.
glslTextureRaster = new GLSLTextureRaster(fboDrawable.getTextureUnit(), true);
glslTextureRaster.init(gl.getGL2ES2());
glslTextureRaster.reshape(gl.getGL2ES2(), 0, 0, fboDrawable.getSurfaceWidth(), fboDrawable.getSurfaceHeight());