EGL: Fall back to NV_coverage_sample if EGL MSAA/FSAA is n/a

2 files changed, 16 insertions, 0 deletions

diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java b/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
index 8a423c6a8..42d911610 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLGLCapabilities.java
@@ -38,6 +38,7 @@ public class EGLGLCapabilities extends GLCapabilities {
   final int  eglcfgid;
   final int renderableType;  
   int nativeVisualID;
+  boolean useNV_coverage_sample;
   
   /** Comparing EGLConfig ID only */
   public static class EglCfgIDComparator implements Comparator {
@@ -85,6 +86,7 @@ public class EGLGLCapabilities extends GLCapabilities {
                                 " with EGL-RenderableType["+renderableTypeToString(null, renderableType)+"]");
       }
       this.renderableType = renderableType;
+      this.useNV_coverage_sample = false;
   }
 
   public Object cloneMutable() {
@@ -104,6 +106,8 @@ public class EGLGLCapabilities extends GLCapabilities {
   final public int getRenderableType() { return renderableType; }
   final public void setNativeVisualID(int vid) { nativeVisualID=vid; }
   final public int getNativeVisualID() { return nativeVisualID; }
+  final public boolean getUseNV_coverage_sample() { return useNV_coverage_sample; }
+  final public void setUseNV_coverage_sample(boolean v) { useNV_coverage_sample=v; }
   
   public static boolean isCompatible(GLProfile glp, int renderableType) {
     if(null == glp) {
@@ -161,6 +165,7 @@ public class EGLGLCapabilities extends GLCapabilities {
     sink.append("0x").append(Long.toHexString(eglcfgid)).append(": ");
     sink.append("vid 0x").append(Integer.toHexString(nativeVisualID)).append(", ");
     super.toString(sink);
+    sink.append(", nv-covrg ").append(getUseNV_coverage_sample());
     sink.append(", [");
     renderableTypeToString(sink, renderableType);
     return sink.append("]");
diff --git a/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java b/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
index 14e67a2c1..5f241a1d0 100644
--- a/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
+++ b/src/jogl/classes/jogamp/opengl/egl/EGLGraphicsConfiguration.java
@@ -217,6 +217,17 @@ public class EGLGraphicsConfiguration extends DefaultGraphicsConfiguration imple
             caps.setSampleBuffers(val.get(0)>0?true:false);
             caps.setNumSamples(val.get(0));
         }
+        if(!caps.getSampleBuffers()) {
+            // try NV_coverage_sample extension 
+            if(EGL.eglGetConfigAttrib(display, config, EGLExt.EGL_COVERAGE_BUFFERS_NV, val)) {
+                if(val.get(0)>0 &&
+                   EGL.eglGetConfigAttrib(display, config, EGLExt.EGL_COVERAGE_SAMPLES_NV, val)) {
+                    caps.setUseNV_coverage_sample(true);                    
+                    caps.setSampleBuffers(true);
+                    caps.setNumSamples(val.get(0));
+                }
+            }
+        }
         if(EGL.eglGetConfigAttrib(display, config, EGL.EGL_TRANSPARENT_TYPE, val)) {
             caps.setBackgroundOpaque(val.get(0) != EGL.EGL_TRANSPARENT_RGB);
         }