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Diffstat (limited to 'Source/Images/nv_image.h')
| -rw-r--r-- | Source/Images/nv_image.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/Source/Images/nv_image.h b/Source/Images/nv_image.h new file mode 100644 index 00000000..f00ea74a --- /dev/null +++ b/Source/Images/nv_image.h @@ -0,0 +1,135 @@ +//----------------------------------------------------------------------------- +// Name: nv_image.h +// Developer: Wolfire Games LLC +// Description: This is a file from an Nvidia image library, with some +// modification made by Wolfire. +// License: Read below +//----------------------------------------------------------------------------- +// +// nvImage.h - Image support class +// +// The nvImage class implements an interface for a multipurpose image +// object. This class is useful for loading and formating images +// for use as textures. The class supports dds, png, and hdr formats. +// +// Author: Evan Hart +// Email: sdkfeedback@nvidia.com +// +// Copyright (c) NVIDIA Corporation. All rights reserved. +//////////////////////////////////////////////////////////////////////////////// +#pragma once + +#include <opengl.h> + +#include <vector> +#include <cassert> + +namespace nv2 { + + class Image { + public: + + Image(); + virtual ~Image(); + + // return the width of the image + int getWidth() const { return _width; } + + //return the height of the image + int getHeight() const { return _height; } + + //return the dpeth of the image (0 for images with no depth) + int getDepth() const { return _depth; } + + //return the number of mipmap levels available for the image + int getMipLevels() const { return _levelCount; } + + //return the number of cubemap faces available for the image (0 for non-cubemap images) + int getFaces() const { return _faces; } + + //return the format of the image data (GL_RGB, GL_BGR, etc) + GLenum getFormat() const { return _format; } + + //return the suggested internal format for the data + GLenum getInternalFormat() const { return _internalFormat; } + + //return the type of the image data + GLenum getType() const { return _type; } + + //return the Size in bytes of a level of the image + int getImageSize(int level = 0) const; + + //return whether the data is a crompressed format + bool isCompressed() const { + switch(_format) { + case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: + case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: + case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: + case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: + case GL_COMPRESSED_LUMINANCE_LATC1_EXT: + case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT: + case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT: + case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT: + return true; + } + return false; + } + + //return whether the image represents a cubemap + bool isCubeMap() const { return _faces > 0; } + + //return whether the image represents a volume + bool isVolume() const { return _depth > 0; } + + //get a pointer to level data + const void* getLevel( int level, GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X) const; + void* getLevel( int level, GLenum face = GL_TEXTURE_CUBE_MAP_POSITIVE_X); + + //initialize an image from a file + bool loadImageFromFile( const char* file); + + //convert a suitable image from a cubemap cross to a cubemap (returns false for unsuitable images) + bool convertCrossToCubemap(); + + //load an image from memory, for the purposes of saving + bool setImage( int width, int height, GLenum format, GLenum type, const void* data); + + //save an image to a file + bool saveImageToFile( const char* file); + + protected: + int _width; + int _height; + int _depth; + int _levelCount; + int _faces; + GLenum _format; + GLenum _internalFormat; + GLenum _type; + int _elementSize; + + //pointers to the levels + std::vector<GLubyte*> _data; + + void freeData(); + void flipSurface(GLubyte *surf, int width, int height, int depth); + + // + // Static elements used to dispatch to proper sub-readers + // + ////////////////////////////////////////////////////////////// + struct FormatInfo { + const char* extension; + bool (*reader)( const char* file, Image& i); + bool (*writer)( const char* file, Image& i); + }; + + static FormatInfo formatTable[]; + + static bool readDDS( const char *file, Image& i); + + static void flip_blocks_dxtc1(GLubyte *ptr, unsigned int numBlocks); + static void flip_blocks_dxtc3(GLubyte *ptr, unsigned int numBlocks); + static void flip_blocks_dxtc5(GLubyte *ptr, unsigned int numBlocks); + }; +} |