Add block definitions for PVRTC

2025-01-08 06:35:33 +00:00 · 2013-08-29 12:06:05 -04:00 · 2013-08-29 12:06:05 -04:00 · d3daed8969
parent 55a61b5d8d
commit d3daed8969
3 changed files with 200 additions and 0 deletions
--- a/PVRTCEncoder/CMakeLists.txt
+++ b/PVRTCEncoder/CMakeLists.txt
@ -57,11 +57,13 @@ INCLUDE_DIRECTORIES(${FasTC_BINARY_DIR}/PVRTCEncoder/include)
 SET( HEADERS
  include/PVRTCCompressor.h
  src/Pixel.h
+  src/Block.h
 )

 SET( SOURCES
  src/Decompressor.cpp
  src/Pixel.cpp
+  src/Block.cpp
 )

 ADD_LIBRARY( PVRTCEncoder
--- a/PVRTCEncoder/src/Block.cpp
+++ b/PVRTCEncoder/src/Block.cpp
@ -0,0 +1,105 @@
+/* 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 "Block.h"
+
+#include <cassert>
+#include <cstring>
+
+namespace PVRTCC {
+
+  Block::Block(uint8 *data)
+    : m_ColorACached(false)
+    , m_ColorBCached(false) {
+    assert(data);
+    memcpy(m_ByteData, data, sizeof(m_ByteData));
+  }
+
+  Pixel Block::GetColorA() {
+    if(m_ColorACached) {
+      return m_ColorA;
+    }
+
+    bool isOpaque = static_cast<bool>(m_ByteData[0] & 0x80);
+    const uint8 opaqueBitDepths[4] = { 0, 5, 5, 5 };
+    const uint8 transBitDepths[4] = { 3, 4, 4, 4 };
+
+    m_ColorA = Pixel(m_ByteData, isOpaque? opaqueBitDepths : transBitDepths);
+    m_ColorACached = true;
+    return m_ColorA;
+  }
+
+  Pixel Block::GetColorB() {
+    if(m_ColorBCached) {
+      return m_ColorB;
+    }
+
+    bool isOpaque = static_cast<bool>(m_ByteData[2] & 0x80);
+    const uint8 opaqueBitDepths[4] = { 0, 5, 5, 4 };
+    const uint8 transBitDepths[4] = { 3, 4, 4, 3 };
+    const uint8 *bitDepths = isOpaque? opaqueBitDepths : transBitDepths;
+
+    m_ColorB = Pixel(m_ByteData + 2, bitDepths, 1);
+    m_ColorBCached = true;
+    return m_ColorB;
+  }
+
+  uint8 Block::GetLerpValue(uint32 texelIdx) const {
+    assert(texelIdx >= 0);
+    assert(texelIdx <= 15);
+
+    const uint8 texel = 15 - texelIdx;
+    const uint8 *texelData = m_ByteData + 4;
+    return (texelData[texel / 4] >> (2 * (3 - (texel % 4)))) & 0x3;
+  }
+
+}  // namespace PVRTCC
--- a/PVRTCEncoder/src/Block.h
+++ b/PVRTCEncoder/src/Block.h
@ -0,0 +1,93 @@
+/* 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/>
+ */
+
+#ifndef PVRTCENCODER_SRC_BLOCK_H_
+#define PVRTCENCODER_SRC_BLOCK_H_
+
+#include "TexCompTypes.h"
+
+#include "Pixel.h"
+
+namespace PVRTCC {
+
+class Block {
+ public:
+  explicit Block(uint8 *data);
+
+  Pixel GetColorA();
+  Pixel GetColorB();
+
+  bool GetModeBit() const {
+    return static_cast<bool>(m_ByteData[3] & 0x1);
+  }
+
+  // Returns the modulation value for the texel in the 4x4 block. The texels are
+  // numbered as follows:
+  //  0  1  2  3
+  //  4  5  6  7
+  //  8  9 10 11
+  // 12 13 14 15
+  uint8 GetLerpValue(uint32 texelIdx) const;
+
+ private:
+  uint8 m_ByteData[8];
+
+  bool m_ColorACached;
+  Pixel m_ColorA;
+
+  bool m_ColorBCached;
+  Pixel m_ColorB;
+};
+
+}  // namespace PVRTCC
+
+#endif  // PVRTCENCODER_SRC_BLOCK_H_