From ad7a618222c44a48c866afbc17f1de8e6607bb47 Mon Sep 17 00:00:00 2001
From: castano <castano@95f4ed2b-212e-0410-8b90-d31948207fce>
Date: Tue, 22 Mar 2011 22:52:43 +0000
Subject: [PATCH] Start adding ktx file support.

---
 src/nvimage/CMakeLists.txt |   3 +-
 src/nvimage/KtxFile.cpp    |  83 ++++++++++++++++++++++++++++++
 src/nvimage/KtxFile.h      | 102 +++++++++++++++++++++++++++++++++++++
 3 files changed, 187 insertions(+), 1 deletion(-)
 create mode 100644 src/nvimage/KtxFile.cpp
 create mode 100644 src/nvimage/KtxFile.h

diff --git a/src/nvimage/CMakeLists.txt b/src/nvimage/CMakeLists.txt
index bbb75d9..029f962 100644
--- a/src/nvimage/CMakeLists.txt
+++ b/src/nvimage/CMakeLists.txt
@@ -5,11 +5,12 @@ SET(IMAGE_SRCS
     BlockDXT.h BlockDXT.cpp
     ColorBlock.h ColorBlock.cpp
     DirectDrawSurface.h DirectDrawSurface.cpp
+    ErrorMetric.h ErrorMetric.cpp
     Filter.h Filter.cpp
     FloatImage.h FloatImage.cpp
-    ErrorMetric.h ErrorMetric.cpp
     Image.h Image.cpp
     ImageIO.h ImageIO.cpp
+    #KtxFile.h KtxFile.cpp
     NormalMap.h NormalMap.cpp
     PixelFormat.h
     PsdFile.h
diff --git a/src/nvimage/KtxFile.cpp b/src/nvimage/KtxFile.cpp
new file mode 100644
index 0000000..de075bd
--- /dev/null
+++ b/src/nvimage/KtxFile.cpp
@@ -0,0 +1,83 @@
+// This code is in the public domain -- Ignacio Castaņo <castano@gmail.com>
+
+#include "KtxFile.h"
+
+using namespace nv;
+
+static const uint8 fileIdentifier[12] = {
+    0xAB, 0x4B, 0x54, 0x58,
+    0x20, 0x31, 0x31, 0xBB,
+    0x0D, 0x0A, 0x1A, 0x0A
+};
+
+
+KtxHeader::KtxHeader() {
+    memcpy(identifier, fileIdentifier, 12);
+
+    endianness = 0x04030201;
+
+    glType = 0;
+    glTypeSize = 1;
+    glFormat = 0;
+    glInternalFormat = KTX_RGBA;
+    glBaseInternalFormat = KTX_RGBA;
+    pixelWidth = 0;
+    pixelHeight = 0;
+    pixelDepth = 0;
+    numberOfArrayElements = 0;
+    numberOfFaces = 1;
+    numberOfMipmapLevels = 0;
+    bytesOfKeyValueData = 0;
+}
+
+
+Stream & operator<< (Stream & s, DDSHeader & header) {
+    s.serialize(header.identifier, 12);
+    s << header.endiannes << header.glType << header.glTypeSize << header.glFormat << header.glInternalFormat << header.glBaseInternalFormat;
+    s << header.pixelWidth << header.pixelHeight << header.pixelDepth;
+    s << header.numberOfArrayElements << header.numberOfFaces << header.numberOfMipmapLevels;
+    s << header.bytesOfKeyValueData;
+    return s;
+}
+
+
+KtxFile::KtxFile() {
+}
+KtxFile::~KtxFile() {
+}
+
+void KtxFile::addKeyValue(const char * key, const char * value) {
+    keyArray.append(key);
+    valueArray.append(value);
+    bytesOfKeyValueData += strlen(key) + 1 + strlen(value) + 1;
+}
+
+
+Stream & operator<< (Stream & s, KtxFile & file) {
+    s << header;
+
+    if (s.isSaving()) {
+
+        int keyValueCount = keyArray.count();
+        for (int i = 0; i < keyValueCount; i++) {
+            const String & key = keyArray[i];
+            const String & value = valueArray[i];
+            uint keySize = key.length() + 1;
+            uint valueSize = value.length() + 1;
+            uint keyValueSize = keySize + valueSize;
+
+            s << keyValueSize;
+
+            s.serialize(key.str(), keySize);
+            s.serialize(value.str(), valueSize);
+        }
+    }
+    else {
+        // @@ Read key value pairs.
+    }
+
+    return s;
+}
+
+
+
diff --git a/src/nvimage/KtxFile.h b/src/nvimage/KtxFile.h
new file mode 100644
index 0000000..9f89590
--- /dev/null
+++ b/src/nvimage/KtxFile.h
@@ -0,0 +1,102 @@
+// This code is in the public domain -- Ignacio Castaņo <castano@gmail.com>
+
+#pragma once
+#ifndef NV_IMAGE_KTXFILE_H
+#define NV_IMAGE_KTXFILE_H
+
+#include "nvimage.h"
+#include "nvcore/StrLib.h"
+
+// KTX File format specification:
+// http://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/#key
+
+namespace nv
+{
+    class Stream;
+
+    // GL types (Table 3.2)
+    const uint KTX_UNSIGNED_BYTE;
+    const uint KTX_UNSIGNED_SHORT_5_6_5;
+    // ...
+
+    // GL formats (Table 3.3)
+    // ...
+
+    // GL internal formats (Table 3.12, 3.13)
+    // ...
+
+    // GL base internal format. (Table 3.11)
+    const uint KTX_RGB;
+    const uint KTX_RGBA;
+    const uint KTX_ALPHA;
+    // ...
+
+
+    struct KtxHeader {
+        uint8 identifier[12];
+        uint32 endianness;
+        uint32 glType;
+        uint32 glTypeSize;
+        uint32 glFormat;
+        uint32 glInternalFormat;
+        uint32 glBaseInternalFormat;
+        uint32 pixelWidth;
+        uint32 pixelHeight;
+        uint32 pixelDepth;
+        uint32 numberOfArrayElements;
+        uint32 numberOfFaces;
+        uint32 numberOfMipmapLevels;
+        uint32 bytesOfKeyValueData;
+
+        KtxHeader();
+
+    };
+
+    NVIMAGE_API Stream & operator<< (Stream & s, DDSHeader & header);
+
+
+    struct KtxFile {
+        KtxFile();
+        ~KtxFile();
+
+        void addKeyValue(const char * key, const char * value);
+
+    private:
+        KtxHeader header;
+
+        Array<String> keyArray;
+        Array<String> valueArray;
+
+    };
+
+    NVIMAGE_API Stream & operator<< (Stream & s, KtxFile & file);
+
+
+    /*
+    for each keyValuePair that fits in bytesOfKeyValueData
+        UInt32   keyAndValueByteSize
+        Byte     keyAndValue[keyAndValueByteSize]
+        Byte     valuePadding[3 - ((keyAndValueByteSize + 3) % 4)]
+    end
+
+    for each mipmap_level in numberOfMipmapLevels*
+        UInt32 imageSize;
+        for each array_element in numberOfArrayElements*
+           for each face in numberOfFaces
+               for each z_slice in pixelDepth*
+                   for each row or row_of_blocks in pixelHeight*
+                       for each pixel or block_of_pixels in pixelWidth
+                           Byte data[format-specific-number-of-bytes]**
+                       end
+                   end
+               end
+               Byte cubePadding[0-3]
+           end
+        end
+        Byte mipPadding[3 - ((imageSize + 3) % 4)]
+    end
+    */
+
+} // nv namespace
+
+#endif // NV_IMAGE_KTXFILE_H