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https://git.dev.opencascade.org/repos/occt.git
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faff37677c
Graphic3d_TextureRoot::GetCompressedImage() - added new interface for fetching compressed texture image. Default implementation detects DDS image files using Image_DDSParser parser. Graphic3d_TextureRoot::GetImage() has been extended with new parameter - the list of image formats supported by OpenGL driver. Graphic3d_TextureRoot::convertToCompatible() implicitly converts BGRA image to RGBA on OpenGL ES, which normally does not support BGR formats. OpenGl_Caps::isTopDownTextureUV - new property defines how application defines UV texture coordinates in primitive arrays. OpenGl_Context::SetTextureMatrix() compares this flag with OpenGl_Texture::IsTopDown() and automatically flips V coordinate in case of mismatch. OpenGl_Texture now holds exact number of mipmap levels instead of Boolean flag indicating that they are defined. This allows loading DDS files with incomplete mipmap level set by setting GL_TEXTURE_MAX_LEVEL to appropriate value instead of default 1000 (causing black textures in case if mipmap levels are not defined till 1x1). Fixed order of texture coordinates transformation within GLSL program to match FFP matrix: Rotate -> Translate -> Scale (previously Rotation was applied afterwards).
256 lines
8.4 KiB
C++
256 lines
8.4 KiB
C++
// Copyright (c) 2020 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#include <Image_DDSParser.hxx>
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#include <Image_PixMap.hxx>
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#include <Image_SupportedFormats.hxx>
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#include <Message.hxx>
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#include <OSD_OpenFile.hxx>
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IMPLEMENT_STANDARD_RTTIEXT(Image_CompressedPixMap, Standard_Transient)
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//! DDS Pixel Format structure.
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struct Image_DDSParser::DDSPixelFormat
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{
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uint32_t Size;
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uint32_t Flags;
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uint32_t FourCC;
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uint32_t RGBBitCount;
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uint32_t RBitMask;
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uint32_t GBitMask;
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uint32_t BBitMask;
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uint32_t ABitMask;
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};
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//! DDS File header structure.
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struct Image_DDSParser::DDSFileHeader
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{
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//! Caps2 flag indicating complete (6 faces) cubemap.
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enum { DDSCompleteCubemap = 0xFE00 };
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//! Return TRUE if cubmap flag is set.
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bool IscompleteCubemap() const { return (Caps2 & DDSFileHeader::DDSCompleteCubemap) == DDSFileHeader::DDSCompleteCubemap; }
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uint32_t Size;
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uint32_t Flags;
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uint32_t Height;
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uint32_t Width;
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uint32_t PitchOrLinearSize;
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uint32_t Depth;
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uint32_t MipMapCount;
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uint32_t Reserved1[11];
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DDSPixelFormat PixelFormatDef;
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uint32_t Caps;
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uint32_t Caps2;
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uint32_t Caps3;
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uint32_t Caps4;
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uint32_t Reserved2;
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};
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// =======================================================================
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// function : Load
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// purpose :
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// =======================================================================
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Handle(Image_CompressedPixMap) Image_DDSParser::Load (const Handle(Image_SupportedFormats)& theSupported,
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const TCollection_AsciiString& theFile,
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const Standard_Integer theFaceIndex,
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const int64_t theFileOffset)
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{
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std::ifstream aFile;
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OSD_OpenStream (aFile, theFile.ToCString(), std::ios::in | std::ios::binary);
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char aHeader[128] = {};
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if (!aFile.is_open()
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|| !aFile.good())
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{
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return Handle(Image_CompressedPixMap)();
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}
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if (theFileOffset != 0)
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{
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aFile.seekg ((std::streamoff )theFileOffset, std::ios::beg);
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}
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aFile.read (aHeader, 128);
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Standard_Size aNbReadBytes = (Standard_Size )aFile.gcount();
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if (aNbReadBytes < 128
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|| ::memcmp (aHeader, "DDS ", 4) != 0)
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{
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return Handle(Image_CompressedPixMap)();
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}
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Handle(Image_CompressedPixMap) aDef = parseHeader (*(const DDSFileHeader* )(aHeader + 4));
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if (aDef.IsNull())
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{
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return Handle(Image_CompressedPixMap)();
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}
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if (!theSupported.IsNull()
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&& !theSupported->IsSupported (aDef->CompressedFormat()))
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{
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return Handle(Image_CompressedPixMap)();
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}
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if (theFaceIndex < 0)
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{
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return aDef;
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}
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if (theFaceIndex >= aDef->NbFaces()
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|| aDef->FaceBytes() == 0)
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{
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Message::SendFail (TCollection_AsciiString ("DDS Reader error - invalid face index #") + theFaceIndex + " within file\n" + theFile);
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return Handle(Image_CompressedPixMap)();
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}
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const Standard_Size anOffset = aDef->FaceBytes() * theFaceIndex;
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if (anOffset != 0)
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{
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aFile.seekg ((std::streamoff )anOffset, std::ios::cur);
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}
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Handle(NCollection_Buffer) aBuffer = new NCollection_Buffer (Image_PixMap::DefaultAllocator(), aDef->FaceBytes());
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aFile.read ((char* )aBuffer->ChangeData(), aDef->FaceBytes());
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aNbReadBytes = (Standard_Size )aFile.gcount();
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if (aNbReadBytes < aDef->FaceBytes())
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{
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Message::SendFail (TCollection_AsciiString ("DDS Reader error - unable to read face #") + theFaceIndex + " data from file\n" + theFile);
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return Handle(Image_CompressedPixMap)();
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}
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aDef->SetFaceData (aBuffer);
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return aDef;
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}
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// =======================================================================
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// function : Load
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// purpose :
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// =======================================================================
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Handle(Image_CompressedPixMap) Image_DDSParser::Load (const Handle(Image_SupportedFormats)& theSupported,
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const Handle(NCollection_Buffer)& theBuffer,
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const Standard_Integer theFaceIndex)
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{
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if (theBuffer.IsNull()
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|| theBuffer->Size() < 128
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|| ::memcmp (theBuffer->Data(), "DDS ", 4) != 0)
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{
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return Handle(Image_CompressedPixMap)();
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}
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Handle(Image_CompressedPixMap) aDef = parseHeader (*(const DDSFileHeader* )(theBuffer->Data() + 4));
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if (aDef.IsNull())
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{
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return Handle(Image_CompressedPixMap)();
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}
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if (!theSupported.IsNull()
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&& !theSupported->IsSupported (aDef->CompressedFormat()))
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{
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return Handle(Image_CompressedPixMap)();
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}
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if (theFaceIndex < 0)
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{
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return aDef;
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}
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if (theFaceIndex >= aDef->NbFaces()
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|| aDef->FaceBytes() == 0)
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{
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Message::SendFail (TCollection_AsciiString ("DDS Reader error - invalid face index #") + theFaceIndex + " within buffer");
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return Handle(Image_CompressedPixMap)();
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}
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const Standard_Size anOffset = aDef->FaceBytes() * theFaceIndex + 128;
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if (theBuffer->Size() < anOffset + aDef->FaceBytes())
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{
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Message::SendFail (TCollection_AsciiString ("DDS Reader error - unable to read face #") + theFaceIndex + " data from buffer");
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return Handle(Image_CompressedPixMap)();
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}
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Handle(NCollection_Buffer) aBuffer = new NCollection_Buffer (Image_PixMap::DefaultAllocator(), aDef->FaceBytes());
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memcpy (aBuffer->ChangeData(), theBuffer->Data() + anOffset, aDef->FaceBytes());
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aDef->SetFaceData (aBuffer);
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return aDef;
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}
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// =======================================================================
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// function : parseHeader
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// purpose :
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// =======================================================================
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Handle(Image_CompressedPixMap) Image_DDSParser::parseHeader (const DDSFileHeader& theHeader)
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{
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if (theHeader.Size != 124
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|| theHeader.Width == 0
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|| theHeader.Height == 0
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|| theHeader.PixelFormatDef.Size != 32)
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{
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return Handle(Image_CompressedPixMap)();
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}
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Image_Format aBaseFormat = Image_Format_UNKNOWN;
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Image_CompressedFormat aFormat = Image_CompressedFormat_UNKNOWN;
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Standard_Integer aBlockSize = 8;
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const bool hasAlpha = (theHeader.PixelFormatDef.Flags & 0x1) != 0;
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if (::memcmp (&theHeader.PixelFormatDef.FourCC, "DXT5", 4) == 0)
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{
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aBaseFormat = Image_Format_RGBA;
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aFormat = Image_CompressedFormat_RGBA_S3TC_DXT5;
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aBlockSize = 16;
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}
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else if (::memcmp (&theHeader.PixelFormatDef.FourCC, "DXT3", 4) == 0)
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{
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aBaseFormat = Image_Format_RGBA;
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aFormat = Image_CompressedFormat_RGBA_S3TC_DXT3;
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aBlockSize = 16;
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}
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else if (::memcmp (&theHeader.PixelFormatDef.FourCC, "DXT1", 4) == 0)
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{
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aBaseFormat = hasAlpha ? Image_Format_RGBA : Image_Format_RGB;
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aFormat = hasAlpha ? Image_CompressedFormat_RGBA_S3TC_DXT1 : Image_CompressedFormat_RGB_S3TC_DXT1;
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aBlockSize = 8;
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}
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if (aFormat == Image_CompressedFormat_UNKNOWN)
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{
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return Handle(Image_CompressedPixMap)();
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}
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Handle(Image_CompressedPixMap) aDef = new Image_CompressedPixMap();
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aDef->SetSize ((Standard_Integer )theHeader.Width, (Standard_Integer )theHeader.Height);
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aDef->SetNbFaces (theHeader.IscompleteCubemap() != 0 ? 6 : 1);
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aDef->SetBaseFormat (aBaseFormat);
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aDef->SetCompressedFormat (aFormat);
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const Standard_Integer aNbMipMaps = Max ((Standard_Integer )theHeader.MipMapCount, 1);
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aDef->ChangeMipMaps().Resize (0, aNbMipMaps - 1, false);
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{
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Standard_Size aFaceSize = 0;
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NCollection_Vec2<Standard_Integer> aMipSizeXY (aDef->SizeX(), aDef->SizeY());
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for (Standard_Integer aMipIter = 0;; ++aMipIter)
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{
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const Standard_Integer aMipLength = ((aMipSizeXY.x() + 3) / 4) * ((aMipSizeXY.y() + 3) / 4) * aBlockSize;
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aFaceSize += aMipLength;
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aDef->ChangeMipMaps().SetValue (aMipIter, aMipLength);
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if (aMipIter + 1 >= aNbMipMaps)
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{
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break;
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}
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aMipSizeXY /= 2;
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if (aMipSizeXY.x() == 0) { aMipSizeXY.x() = 1; }
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if (aMipSizeXY.y() == 0) { aMipSizeXY.y() = 1; }
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}
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aDef->SetCompleteMipMapSet (aMipSizeXY.x() == 1 && aMipSizeXY.y() == 1);
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aDef->SetFaceBytes (aFaceSize);
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}
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return aDef;
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}
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