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-rw-r--r--src/jogl/classes/jogamp/opengl/windows/wgl/WindowsBitmapWGLDrawable.java3
-rw-r--r--src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java2
2 files changed, 3 insertions, 2 deletions
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsBitmapWGLDrawable.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsBitmapWGLDrawable.java
index a7f62fccf..3c326e93e 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsBitmapWGLDrawable.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsBitmapWGLDrawable.java
@@ -91,7 +91,8 @@ public class WindowsBitmapWGLDrawable extends WindowsWGLDrawable {
final GLCapabilitiesImmutable capsChosen;
{
final GLCapabilitiesImmutable capsChosen0 = (GLCapabilitiesImmutable)config.getChosenCapabilities();
- capsChosen = GLGraphicsConfigurationUtil.clipRGBAGLCapabilities(capsChosen0, false /* allowRGB555 */);
+ // RGB555 and also alpha channel is experienced to fail on some Windows machines
+ capsChosen = GLGraphicsConfigurationUtil.clipRGBAGLCapabilities(capsChosen0, false /* allowRGB555 */, false /* allowAlpha */);
if( capsChosen0 != capsChosen ) {
config.setChosenCapabilities(capsChosen);
if(DEBUG) {
diff --git a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
index 3b71c4462..017f8c40b 100644
--- a/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/windows/wgl/WindowsWGLGraphicsConfiguration.java
@@ -610,7 +610,7 @@ public class WindowsWGLGraphicsConfiguration extends MutableGraphicsConfiguratio
if( GLGraphicsConfigurationUtil.BITMAP_BIT == drawableTypeBits ) {
// BITMAP exclusive PFD SafeGuard: Only accept BITMAP compatible color formats!
final int pfdColorBits = pfd.getCColorBits();
- if ( pfdColorBits != 24 || pfd.getCRedBits() < pfd.getCAlphaBits() ) { // Allowed: RGB888 && alpha <= red
+ if ( pfdColorBits != 24 || 0 < pfd.getCAlphaBits() ) { // Allowed: RGB888 && !alpha
if(DEBUG) {
System.err.println("Drop [color bits excl BITMAP]: " + WGLGLCapabilities.PFD2String(pfd, pfdID));
}