Adding 3D lut color filter

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 #include "GrGLContext.h"
@@ skipping 581 matching lines @@
     // filtering modes are not supported.  This is for simplicity, but a more
     // granular approach is possible.  Coincidentally, floating point textures became part of
     // the standard in ES3.1 / OGL 3.1, hence the shorthand
     bool hasFPTextures = version >= GR_GL_VER(3, 1);
     if (!hasFPTextures) {
         hasFPTextures = ctxInfo.hasExtension("GL_ARB_texture_float") ||
                         (ctxInfo.hasExtension("OES_texture_float_linear") &&
                          ctxInfo.hasExtension("GL_OES_texture_float"));
     }
     fConfigTextureSupport[kRGBA_float_GrPixelConfig] = hasFPTextures;
+    
+    // 3D textures. Texture wrap modes and mip-mapping is supported for power
+    // of two 3D textures. Mip-mapping and texture wrap modes other than
+    // CLAMP_TO_EDGE are not supported for non-power of two 3D textures.
+    // The OES_texture_npot extension, if supported, will enable mip-mapping
+    // and other wrap modes for non-power of two 3D textures.
+    f3DTexImageSupport = 
+        (version >= GR_GL_VER(1, 2)) || // glTexture3D has been core since OpenGL 1.2
+        ctxInfo.hasExtension("GL_EXT_texture_3D") ||
+        ctxInfo.hasExtension("GL_OES_texture_3D"); // No need for npot for now
 }
 
 bool GrGLCaps::readPixelsSupported(const GrGLInterface* intf,
                                    GrGLenum format,
                                    GrGLenum type) const {
     if (GR_GL_RGBA == format && GR_GL_UNSIGNED_BYTE == type) {
         // ES 2 guarantees this format is supported
         return true;
     }
 
@@ skipping 229 matching lines @@
     r.appendf("Two Format Limit: %s\n", (fTwoFormatLimit ? "YES": "NO"));
     r.appendf("Fragment coord conventions support: %s\n",
              (fFragCoordsConventionSupport ? "YES": "NO"));
     r.appendf("Vertex array object support: %s\n", (fVertexArrayObjectSupport ? "YES": "NO"));
     r.appendf("Use non-VBO for dynamic data: %s\n",
              (fUseNonVBOVertexAndIndexDynamicData ? "YES" : "NO"));
     r.appendf("Full screen clear is free: %s\n", (fFullClearIsFree ? "YES" : "NO"));
     r.appendf("Drops tile on zero divide: %s\n", (fDropsTileOnZeroDivide ? "YES" : "NO"));
     return r;
 }