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| -rw-r--r-- | dev/MinGfx/src/texture2d.h | 139 |
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diff --git a/dev/MinGfx/src/texture2d.h b/dev/MinGfx/src/texture2d.h new file mode 100644 index 0000000..a07d80f --- /dev/null +++ b/dev/MinGfx/src/texture2d.h @@ -0,0 +1,139 @@ +/* + This file is part of the MinGfx Project. + + Copyright (c) 2017,2018 Regents of the University of Minnesota. + All Rights Reserved. + + Original Author(s) of this File: + Dan Keefe, 2018, University of Minnesota + + Author(s) of Significant Updates/Modifications to the File: + ... + */ + +#ifndef SRC_TEXTURE2D_H_ +#define SRC_TEXTURE2D_H_ + + +#include "opengl_headers.h" +#include "color.h" + +#include <string> + + +namespace mingfx { + +/** A wrapper around a 2D texture that supports loading images from files or + setting texture color data directly. Example: + ~~~ + Texture2D tex1; + Texture2D tex2(GL_CLAMP_TO_EDGE); + + void MyGraphicsApp::InitOpenGL() { + std::vector<std::string> search_path; + search_path.push_back("."); + search_path.push_back("./data"); + search_path.push_back("./shaders"); + tex1.InitFromFile(Platform::FindFile("earth-2k.png", search_path)); + tex2.InitFromFile(Platform::FindFile("toon-ramp.png", search_path)); + } + ~~~ + */ +class Texture2D { +public: + + /// Creates an empty texture. Optional parameters can be provided to set + /// the texture wrap mode and filter mode. + Texture2D(GLenum wrapMode=GL_REPEAT, GLenum filterMode=GL_LINEAR); + virtual ~Texture2D(); + + + /// Call this from within the InitOpenGL() function since it will initialize + /// not just the Texture2D's internal data but also an OpenGL texture to be + /// stored on the graphics card. Internally, this uses the stbi library to + /// load images. It supports png, jpg, bmp, and other file formats. + bool InitFromFile(const std::string &filename); + + /// Call this from within the InitOpenGL() function since it will initialize + /// not just the Texture2D's internal data but also an OpenGL texture to be + /// stored on the graphics card. + /// With this version of Init, you may pass in your own pointer to color data. + /// The data argument must point to an array of 4-channel color data stored as + /// unsigned chars in RGBA format. You are responsible for managing the memory + /// for this array. If you will never call Pixel(), then it is safe to free + /// data as soon as this function returns. Otherwise, you need to make sure + /// data does not change in memory until you destroy the Texture2D object. + bool InitFromBytes(int width, int height, const unsigned char * data); + + /// Call this from within the InitOpenGL() function since it will initialize + /// not just the Texture2D's internal data but also an OpenGL texture to be + /// stored on the graphics card. + /// With this version of Init, you may pass in your own pointer to color data. + /// The data argument must point to an array of 4-channel color data stored as + /// floats in RGBA format. You are responsible for managing the memory + /// for this array. If you will never call Pixel(), then it is safe to free + /// data as soon as this function returns. Otherwise, you need to make sure + /// data does not change in memory until you destroy the Texture2D object. + bool InitFromFloats(int width, int height, const float * data); + + + /// This function may be called to re-read the texture data from an array + /// formated the same as in InitFromBytes. The width and height of the + /// texture must remain the same. + bool UpdateFromBytes(const unsigned char * data); + + /// This function may be called to re-read the texture data from an array + /// formated the same as in InitFromFloats. The width and height of the + /// texture must remain the same. + bool UpdateFromFloats(const float * data); + + + /// Returns true if the texture data has been successfully transferred to OpenGL. + bool initialized() const; + + /// Returns the width in pixels of the texture. + int width() const; + + /// Returns the height in pixels of the texture. + int height() const; + + /// Returns the unsigned int used as the texture handle by OpenGL + GLuint opengl_id() const; + + /// Returns an enumerated constant for the OpenGL wrap mode used by the texture. + GLenum wrap_mode() const; + + /// Returns an enumerated constant for the OpenGL filter mode used by the texture. + GLenum filter_mode() const; + + /// Uses the OpenGL texture wrap mode arguments + void set_wrap_mode(GLenum wrapMode); + + /// Uses the OpenGL texture filter mode arguments + void set_filter_mode(GLenum filterMode); + + /// Returns the color at the specified pixel. The top left corner of the + /// image is (0,0) and the bottom right is (width()-1, height()-1). + Color Pixel(int x, int y) const; + +private: + + bool InitOpenGL(); + + GLenum dataType_; // GL_UNSIGNED_BYTE or GL_FLOAT + const unsigned char * data_ubyte_; + const float * data_float_; + + int width_; + int height_; + bool handleMemInternally_; + + GLuint texID_; + GLenum wrapMode_; + GLenum filterMode_; +}; + + +} // end namespace + +#endif
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