Add PVR tests

If cmake was able to find Imagination's PVR library, then it'd be nice to make sure that our decompressor matches theirs. We incur a bit of overhead by adding .pvr files into git, but hopefully this cost will be beneficial to actually figuring out how things are working...

PVRTCEncoder/test/CMakeLists.txt

@@ -69,3 +69,33 @@ FOREACH(TEST ${TESTS})
   ADD_TEST(${TEST_NAME} ${TEST_NAME})
 ENDFOREACH()
 
+# Test the decompressor against the included PVR Texture library....
+IF(PVRTEXLIB_FOUND)
+
+  SET(TEST_NAME TestDecompVersusPVRLib)
+
+  # Copy the .pvr files that we will use for testing...
+  SET(TEST_IMAGES
+    gradient white gray
+  )
+  FOREACH(IMAGE ${TEST_IMAGES})
+    FILE(COPY
+      ${FasTC_SOURCE_DIR}/PVRTCEncoder/test/data/${IMAGE}.pvr
+      DESTINATION ${CMAKE_BINARY_DIR}
+      USE_SOURCE_PERMISSIONS
+    )
+  ENDFOREACH()
+
+  # Make sure to include the PVR library headers...
+  INCLUDE_DIRECTORIES( ${PVRTEXLIB_INCLUDE_DIRS} )
+
+  # The cpp file to compile for the test
+  ADD_EXECUTABLE(${TEST_NAME} DecompTestPVR.cpp)
+
+  # Libraries that we need...
+  TARGET_LINK_LIBRARIES(${TEST_NAME} PVRTCEncoder)
+  TARGET_LINK_LIBRARIES(${TEST_NAME} gtest_main)
+  TARGET_LINK_LIBRARIES(${TEST_NAME} ${PVRTEXLIB_LIBRARIES} )
+
+  ADD_TEST(${TEST_NAME} ${TEST_NAME})
+ENDIF(PVRTEXLIB_FOUND)

PVRTCEncoder/test/DecompTestPVR.cpp

@@ -0,0 +1,106 @@
+/* FasTC
+ * Copyright (c) 2013 University of North Carolina at Chapel Hill.
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for educational, research, and non-profit purposes, without
+ * fee, and without a written agreement is hereby granted, provided that the
+ * above copyright notice, this paragraph, and the following four paragraphs
+ * appear in all copies.
+ *
+ * Permission to incorporate this software into commercial products may be
+ * obtained by contacting the authors or the Office of Technology Development
+ * at the University of North Carolina at Chapel Hill <otd@unc.edu>.
+ *
+ * This software program and documentation are copyrighted by the University of
+ * North Carolina at Chapel Hill. The software program and documentation are
+ * supplied "as is," without any accompanying services from the University of
+ * North Carolina at Chapel Hill or the authors. The University of North
+ * Carolina at Chapel Hill and the authors do not warrant that the operation of
+ * the program will be uninterrupted or error-free. The end-user understands
+ * that the program was developed for research purposes and is advised not to
+ * rely exclusively on the program for any reason.
+ *
+ * IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
+ * AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
+ * OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
+ * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
+ * AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
+ * DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY 
+ * STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
+ * AN "AS IS" BASIS, AND THE UNIVERSITY  OF NORTH CAROLINA AT CHAPEL HILL AND
+ * THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, 
+ * ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Please send all BUG REPORTS to <pavel@cs.unc.edu>.
+ *
+ * The authors may be contacted via:
+ *
+ * Pavel Krajcevski
+ * Dept of Computer Science
+ * 201 S Columbia St
+ * Frederick P. Brooks, Jr. Computer Science Bldg
+ * Chapel Hill, NC 27599-3175
+ * USA
+ * 
+ * <http://gamma.cs.unc.edu/FasTC/>
+ */
+
+#include "gtest/gtest.h"
+
+// This is the PVR library header
+#include "PVRTextureUtilities.h"
+
+// This is our library header
+#include "PVRTCCompressor.h"
+
+#include "TestUtils.h"
+
+class ImageTester {
+public:
+  ImageTester(const char *filename) {
+    pvrtexture::CPVRTexture pvrTex(filename);
+
+    const uint8 *data = static_cast<const uint8 *>(pvrTex.getDataPtr());
+    ASSERT_TRUE(data);
+  
+    const pvrtexture::CPVRTextureHeader &hdr = pvrTex.getHeader();
+    const uint32 w = hdr.getWidth();
+    const uint32 h = hdr.getHeight();
+
+    uint32 *outPixels = new uint32[w * h];
+
+    DecompressionJob dcj(data, reinterpret_cast<uint8 *>(outPixels), w, h);
+    PVRTCC::Decompress(dcj, PVRTCC::eWrapMode_Wrap);
+
+    bool result = pvrtexture::Transcode(pvrTex,
+                                        pvrtexture::PVRStandard8PixelType,
+                                        ePVRTVarTypeUnsignedByte,
+                                        ePVRTCSpacelRGB);
+    EXPECT_TRUE(result);
+
+    uint32 *libPixels = static_cast<uint32 *>(pvrTex.getDataPtr());
+
+    for(int i = 0; i < w*h; i++) {
+      EXPECT_EQ(PixelPrinter(libPixels[i]), PixelPrinter(outPixels[i]));
+    }
+
+    delete outPixels;
+  }
+};
+
+TEST(Decompressor, DecompressGradient) {
+  ImageTester("gradient.pvr");
+}
+
+TEST(Decompressor, DecompressWhite) {
+  ImageTester("white.pvr");
+}
+
+TEST(Decompressor, DecompressGray) {
+  ImageTester("gray.pvr");
+}