Optimized buffer binding checks for glVertexPointer and similar calls

on request from John Burkey. Now caches the buffer binding for
GL_ARRAY_BUFFER, etc. upon glBindBuffer calls and invalidates this
cache upon glPushClientAttrib / glPopClientAttrib calls, refreshing
the state only when necessary using the glGetIntegerv call. Fixed
knowledge of available OpenGL versions to support OpenGL 2.1 (and
future minor version updates). Fixed breakage of
GL_NV_vertex_array_range support after recent upgrade of wglext.h and
glxext.h headers.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@994 232f8b59-042b-4e1e-8c03-345bb8c30851

2 files changed, 94 insertions, 4 deletions

diff --git a/make/gl-common.cfg b/make/gl-common.cfg
index b06742518..984d0f45a 100644
--- a/make/gl-common.cfg
+++ b/make/gl-common.cfg
@@ -262,6 +262,10 @@ ArgumentIsString glGetAttribLocationARB 1
 # 
 JavaPrologue glBegin inBeginEndPair = true;
 JavaEpilogue glEnd   inBeginEndPair = false;
+JavaEpilogue glBindBuffer       setBoundBufferObject({0}, {1});
+JavaEpilogue glBindBufferARB    setBoundBufferObject({0}, {1});
+JavaEpilogue glPushClientAttrib clearBufferObjectState();
+JavaEpilogue glPopClientAttrib  clearBufferObjectState();
 BufferObjectKind UnpackPixel glBitmap
 BufferObjectKind UnpackPixel glColorTable
 BufferObjectKind UnpackPixel glColorSubTable
diff --git a/make/gl-impl-CustomJavaCode.java b/make/gl-impl-CustomJavaCode.java
index 4e761c3bf..ac2c1eab5 100644
--- a/make/gl-impl-CustomJavaCode.java
+++ b/make/gl-impl-CustomJavaCode.java
@@ -153,7 +153,10 @@ private boolean bufferObjectExtensionsInitialized = false;
 private boolean haveARBPixelBufferObject;
 private boolean haveEXTPixelBufferObject;
 private boolean haveGL15;
+private boolean haveGL21;
 private boolean haveARBVertexBufferObject;
+private boolean[] bufferBindingsKnown = new boolean[4];
+private int[]     bufferBindings      = new int[4];
 
 private void initBufferObjectExtensionChecks() {
   if (bufferObjectExtensionsInitialized)
@@ -162,30 +165,105 @@ private void initBufferObjectExtensionChecks() {
   haveARBPixelBufferObject  = isExtensionAvailable("GL_ARB_pixel_buffer_object");
   haveEXTPixelBufferObject  = isExtensionAvailable("GL_EXT_pixel_buffer_object");
   haveGL15                  = isExtensionAvailable("GL_VERSION_1_5");
+  haveGL21                  = isExtensionAvailable("GL_VERSION_2_1");
   haveARBVertexBufferObject = isExtensionAvailable("GL_ARB_vertex_buffer_object");
 }
 
+// Might want to call this from GLContext.makeCurrent() in the future
+// to possibly increase the robustness of these caches
+private void clearBufferObjectState() {
+  for (int i = 0; i < bufferBindingsKnown.length; i++) {
+    bufferBindingsKnown[i] = false;
+  }
+}
+
+// Called by glBindBuffer
+private void setBoundBufferObject(int state, int buffer) {
+  switch (state) {
+    case GL.GL_ARRAY_BUFFER:
+      bufferBindingsKnown[0] = true;
+      bufferBindings[0] = buffer;
+      break;
+      
+    case GL.GL_ELEMENT_ARRAY_BUFFER:
+      bufferBindingsKnown[1] = true;
+      bufferBindings[1] = buffer;
+      break;
+
+    case GL.GL_PIXEL_PACK_BUFFER:
+      bufferBindingsKnown[2] = true;
+      bufferBindings[2] = buffer;
+      break;
+
+    case GL.GL_PIXEL_UNPACK_BUFFER:
+      bufferBindingsKnown[3] = true;
+      bufferBindings[3] = buffer;
+      break;
+
+    default:
+      // There are other enumerants now supported as arguments to
+      // glBindBuffer(); e.g., GL_TRANSFORM_FEEDBACK_BUFFER_NV. It is
+      // likely this code will need to be updated in the future, but
+      // for now it is believed that there are no other enumerants
+      // that need to be supported in order to support the buffer
+      // object checking necessary for class GL.
+      break;
+  }
+}
+
+private int getBoundBufferObject(int state) {
+  // Compute the index we need
+  int index = -1;
+  switch (state) {
+    case GL.GL_ARRAY_BUFFER_BINDING:
+      index = 0;
+      break;
+    case GL.GL_ELEMENT_ARRAY_BUFFER_BINDING:
+      index = 1;
+      break;
+    case GL.GL_PIXEL_PACK_BUFFER_BINDING:
+      index = 2;
+      break;
+    case GL.GL_PIXEL_UNPACK_BUFFER_BINDING:
+      index = 3;
+      break;
+    default:
+      // No other currently supported enumerants; return early
+      break;
+  }
+  if (index < 0)
+    return 0;
+  if (!bufferBindingsKnown[index]) {
+    // Get the state and cache it
+    glGetIntegerv(state, bufTmp, 0);
+    bufferBindingsKnown[index] = true;
+    bufferBindings[index] = bufTmp[0];
+  }
+  return bufferBindings[index];
+}
+
 private void checkBufferObject(boolean extension1,
                                boolean extension2,
+                               boolean extension3,
                                boolean enabled,
                                int state,
                                String kind) {
   if (inBeginEndPair) {
     throw new GLException("May not call this between glBegin and glEnd");
   }
-  boolean avail = (extension1 || extension2);
+  boolean avail = (extension1 || extension2 || extension3);
   if (!avail) {
     if (!enabled)
       return;
     throw new GLException("Required extensions not available to call this function");
   }
-  glGetIntegerv(state, bufTmp, 0);
+  int buffer = getBoundBufferObject(state);
   if (enabled) {
-    if (bufTmp[0] == 0) {
+    if (buffer == 0) {
       throw new GLException(kind + " must be enabled to call this method");
     }
   } else {
-    if (bufTmp[0] != 0) {
+    if (buffer != 0) {
       throw new GLException(kind + " must be disabled to call this method");
     }
   }
@@ -195,6 +273,7 @@ private void checkUnpackPBODisabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveARBPixelBufferObject,
                     haveEXTPixelBufferObject,
+                    haveGL21,
                     false,
                     GL.GL_PIXEL_UNPACK_BUFFER_BINDING_ARB,
                     "unpack pixel_buffer_object");
@@ -204,6 +283,7 @@ private void checkUnpackPBOEnabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveARBPixelBufferObject,
                     haveEXTPixelBufferObject,
+                    haveGL21,
                     true,
                     GL.GL_PIXEL_UNPACK_BUFFER_BINDING_ARB,
                     "unpack pixel_buffer_object");
@@ -213,6 +293,7 @@ private void checkPackPBODisabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveARBPixelBufferObject,
                     haveEXTPixelBufferObject,
+                    haveGL21,
                     false,
                     GL.GL_PIXEL_PACK_BUFFER_BINDING_ARB,
                     "pack pixel_buffer_object");
@@ -222,6 +303,7 @@ private void checkPackPBOEnabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveARBPixelBufferObject,
                     haveEXTPixelBufferObject,
+                    haveGL21,
                     true,
                     GL.GL_PIXEL_PACK_BUFFER_BINDING_ARB,
                     "pack pixel_buffer_object");
@@ -233,6 +315,7 @@ private void checkArrayVBODisabled() {
   checkBufferObject(haveGL15,
                     haveARBVertexBufferObject,
                     false,
+                    false,
                     GL.GL_ARRAY_BUFFER_BINDING,
                     "array vertex_buffer_object");
 }
@@ -241,6 +324,7 @@ private void checkArrayVBOEnabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveGL15,
                     haveARBVertexBufferObject,
+                    false,
                     true,
                     GL.GL_ARRAY_BUFFER_BINDING,
                     "array vertex_buffer_object");
@@ -251,6 +335,7 @@ private void checkElementVBODisabled() {
   checkBufferObject(haveGL15,
                     haveARBVertexBufferObject,
                     false,
+                    false,
                     GL.GL_ELEMENT_ARRAY_BUFFER_BINDING,
                     "element vertex_buffer_object");
 }
@@ -259,6 +344,7 @@ private void checkElementVBOEnabled() {
   initBufferObjectExtensionChecks();
   checkBufferObject(haveGL15,
                     haveARBVertexBufferObject,
+                    false,
                     true,
                     GL.GL_ELEMENT_ARRAY_BUFFER_BINDING,
                     "element vertex_buffer_object");