MPMA Framework 0.4
Texture.h
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00001 
00002 //Luke Lenhart, 2010
00003 //See /docs/License.txt for details on how this code may be used.
00004 
00005 #pragma once
00006 
00007 #include "../base/Setup.h"
00008 
00009 #ifdef MPMA_COMPILE_GFX
00010 
00011 #include "../base/Types.h"
00012 #include "../base/ReferenceCount.h"
00013 #include "../base/File.h"
00014 #include "../gfxsetup/GL.h"
00015 #include "../gfxsetup/Extensions.h"
00016 
00017 #include <string>
00018 
00019 namespace GFX
00020 {
00022     struct TextureDimensions
00023     {
00024         nuint Width; 
00025         nuint Height; 
00026         //nuint Depth;
00027 
00029         inline TextureDimensions(nuint wid=0, nuint hei=1/*, nuint dep=1*/)
00030         { Width=wid; Height=hei; /*Depth=dep;*/ }
00031     };
00032 
00034     struct TextureCreateParameters
00035     {
00037         GLint Format;
00039         bool GenerateMipMaps;
00041         TextureDimensions Dimensions; //Resize source image to this (if non-zero size)
00042 
00043         //bool Compress; //TODO
00044 
00045         inline TextureCreateParameters(): Format(GL_RGBA8), GenerateMipMaps(true)//, Compress(false)
00046         {}
00047     };
00048 
00049     struct TextureData
00050     {
00051         GLuint object;
00052         TextureDimensions origDimensions;
00053 
00054         inline TextureData(): object(0)
00055         {}
00056     };
00057 
00059     class TextureBase: public MPMA::ReferenceCountedData<TextureData>
00060     {
00061     public:
00062         virtual ~TextureBase();
00063 
00065         bool Create();
00067         void Free();
00068 
00069         //Retrieves the OpenGL texture object.
00070         inline operator GLuint() const { return Data().object; }
00071 
00073         inline const nuint& OriginalWidth() const { return Data().origDimensions.Width; }
00075         inline const nuint& OriginalHeight() const { return Data().origDimensions.Height; }
00076         //inline const nuint& OriginalDepth() const { return Data().origDimensions.Depth; }
00077 
00078 #ifdef GFX_USES_IMAGEMAGICK
00079 
00080         bool CreateFromFile(const MPMA::Filename &filename, const TextureCreateParameters *properties=0);
00081         //bool CreateFromFileInMemory(const unsigned char *memory, nuint byteCount, const TextureCreateParameters *properties=0); //TODO
00082 #endif
00083 
00084         bool CreateFromMemory(void *sourceData, const TextureCreateParameters *properties, GLint pixelFormat=GL_RGBA, GLenum pixelSize=GL_UNSIGNED_BYTE, GLenum usage=GL_STATIC_DRAW);
00085 
00087         inline void BindAndSetState(int stage)
00088         {
00089             glActiveTextureARB(GL_TEXTURE0_ARB+stage);
00090             glBindTexture(target, *this);
00091             glEnable(target);
00092         }
00093 
00095         inline void Unbind(int stage)
00096         {
00097             glActiveTextureARB(GL_TEXTURE0_ARB+stage);
00098             glBindTexture(target, 0);
00099             glDisable(target);
00100         }
00101 
00102     protected:
00103         inline TextureBase(GLenum textureTarget): target(textureTarget)
00104         {}
00105 
00106         GLenum target;
00107     };
00108 
00110     class Texture2D: public TextureBase
00111     {
00112     public:
00113         inline Texture2D(): TextureBase(GL_TEXTURE_2D)
00114         {}
00115     };
00116 
00118     class AutoBindTexture
00119     {
00120     public:
00121         inline AutoBindTexture(TextureBase &texToBind, int stage=0): tex(texToBind), boundStage(stage) { tex.BindAndSetState(stage); }
00122         inline ~AutoBindTexture() { tex.Unbind(boundStage); }
00123 
00124     private:
00125         TextureBase &tex;
00126         int boundStage;
00127 
00128         //prevent copying
00129         AutoBindTexture(const AutoBindTexture &o);
00130         bool operator=(const AutoBindTexture &o);
00131     };
00132 }
00133 
00134 #endif //#ifdef MPMA_COMPILE_GFX
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