diff options
Diffstat (limited to 'src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java')
| -rw-r--r-- | src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java b/src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java index ec6d54d66..cf88e7bf6 100644 --- a/src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java +++ b/src/jogl/classes/com/jogamp/opengl/util/GLDrawableUtil.java @@ -30,6 +30,8 @@ package com.jogamp.opengl.util; import javax.media.nativewindow.AbstractGraphicsDevice; import javax.media.opengl.GLAnimatorControl; import javax.media.opengl.GLAutoDrawable; +import javax.media.opengl.GLBase; +import javax.media.opengl.GLCapabilitiesImmutable; import javax.media.opengl.GLContext; import javax.media.opengl.GLDrawable; import javax.media.opengl.GLEventListener; @@ -168,4 +170,23 @@ public class GLDrawableUtil { if(bIsPaused) { bAnim.resume(); } } + /** + * Determines whether the chosen {@link GLCapabilitiesImmutable} + * requires a {@link GLDrawable#swapBuffers() swap-buffers} + * before reading pixels. + * <p> + * Usually one uses the {@link GLBase#getDefaultReadBuffer() default-read-buffer} + * in which case {@link GLDrawable#swapBuffers() swap-buffers} shall happen <b>after</b> calling reading pixels, the default. + * </p> + * <p> + * However, <i>multisampling</i> offscreen {@link javax.media.opengl.GLFBODrawable}s + * utilize {@link GLDrawable#swapBuffers() swap-buffers} to <i>downsample</i> + * the multisamples into the readable sampling sink. + * In this case, we require {@link GLDrawable#swapBuffers() swap-buffers} <b>before</b> reading pixels. + * </p> + * @return chosenCaps.isFBO() && chosenCaps.getSampleBuffers() + */ + public static final boolean swapBuffersBeforeRead(final GLCapabilitiesImmutable chosenCaps) { + return chosenCaps.isFBO() && chosenCaps.getSampleBuffers(); + } } |