Fix issues in GLES backends

Author: riccardobl

jme3-android/src/main/java/com/jme3/renderer/android/AndroidGL.java

@@ -348,16 +348,16 @@ public String glGetProgramInfoLog(int program, int maxLength) {
 
     @Override
     public long glGetQueryObjectui64(int query, int pname) {
-        IntBuffer buff = IntBuffer.allocate(1);
+        IntBuffer buff = tmpBuff.clear();
         //FIXME This is wrong IMO should be glGetQueryObjectui64v with a LongBuffer but it seems the API doesn't provide it.
         GLES30.glGetQueryObjectuiv(query, pname, buff);
         return buff.get(0);
     }
 
     @Override
     public int glGetQueryObjectiv(int query, int pname) {
-        IntBuffer buff = IntBuffer.allocate(1);
-        GLES30.glGetQueryiv(query, pname, buff);
+        IntBuffer buff = tmpBuff.clear();
+        GLES30.glGetQueryObjectuiv(query, pname, buff);
         return buff.get(0);
     }
 
@@ -758,5 +758,10 @@ public void glGenVertexArrays(IntBuffer arrays) {
 
     }
 
+    @Override
+    public String glGetString(int name, int index) {
+        return GLES30.glGetStringi(name, index);
+    }
+
 }
 

jme3-core/src/main/java/com/jme3/renderer/opengl/GLES_30.java

@@ -42,10 +42,14 @@ public interface GLES_30 extends GL {
 
     public static final int GL_RGB10_A2 = 0x8059;
     public static final int GL_UNSIGNED_INT_2_10_10_10_REV = 0x8368;
- 
+    public static final int GL_NUM_EXTENSIONS = 0x821D;
+
     public void glBindVertexArray(int array);
 
     public void glDeleteVertexArrays(IntBuffer arrays);
 
     public void glGenVertexArrays(IntBuffer arrays);
+
+    public String glGetString(final int name, final int index);
+
 }

jme3-core/src/main/java/com/jme3/renderer/opengl/GLRenderer.java

@@ -186,7 +186,15 @@ private HashSet<String> loadExtensions() {
             gl3.glGetInteger(GL3.GL_NUM_EXTENSIONS, intBuf16);
             int extensionCount = intBuf16.get(0);
             for (int i = 0; i < extensionCount; i++) {
-                String extension = gl3.glGetString(GL.GL_EXTENSIONS, i);
+                String extension = gl3.glGetString(GL3.GL_EXTENSIONS, i);
+                extensionSet.add(extension);
+            }
+        } else if (caps.contains(Caps.OpenGLES30)) {
+            GLES_30 gles = (GLES_30) gl;
+            gles.glGetInteger(GLES_30.GL_NUM_EXTENSIONS, intBuf16);
+            int extensionCount = intBuf16.get(0);
+            for (int i = 0; i < extensionCount; i++) {
+                String extension = gles.glGetString(GLES_30.GL_EXTENSIONS, i);
                 extensionSet.add(extension);
             }
         } else {

jme3-ios/src/main/java/com/jme3/renderer/ios/IosGL.java

@@ -809,5 +809,9 @@ public void glGenVertexArrays(IntBuffer arrays) {
         throw new UnsupportedOperationException("Unimplemented method 'glGenVertexArrays'");
     }
 
+    @Override
+    public String glGetString(int name, int index) {
+        return JmeIosGLES.glGetStringi(name, index);
+    }
 
 }

jme3-ios/src/main/java/com/jme3/renderer/ios/JmeIosGLES.java

@@ -201,6 +201,8 @@ private JmeIosGLES() {
     public static native String glGetShaderInfoLog(int shader);
     public static native void glGetShaderiv(int shader, int pname, int[] params, int offset);
     public static native String glGetString(int name);
+
+    public static native String glGetStringi(int name, int index);
     public static native int glGetUniformLocation(int program, String name);
     public static native boolean glIsEnabled(int cap);
     public static native boolean glIsFramebuffer(int framebuffer);