1 | //------------------------------------------------------------------------------
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2 | // File : rendertexture.h
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3 | //------------------------------------------------------------------------------
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4 | // Copyright 2002 Mark J. Harris and
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5 | // The University of North Carolina at Chapel Hill
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6 | //------------------------------------------------------------------------------
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7 | // Permission to use, copy, modify, distribute and sell this software and its
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8 | // documentation for any purpose is hereby granted without fee, provided that
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9 | // the above copyright notice appear in all copies and that both that copyright
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10 | // notice and this permission notice appear in supporting documentation.
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11 | // Binaries may be compiled with this software without any royalties or
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12 | // restrictions.
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13 | //
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14 | // The author(s) and The University of North Carolina at Chapel Hill make no
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15 | // representations about the suitability of this software for any purpose.
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16 | // It is provided "as is" without express or implied warranty.
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17 | // -----------------------------------------------------------------------------
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18 | // Credits:
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19 | // Original RenderTexture code: Mark J. Harris
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20 | // Original Render-to-depth-texture support: Thorsten Scheuermann
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21 | // Linux Copy-to-texture: Eric Werness
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22 | // Various Bug Fixes: Daniel (Redge) Sperl
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23 | // Bill Baxter
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24 | //
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25 | // -----------------------------------------------------------------------------
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26 | /**
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27 | * @file RenderTexture.h
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28 | *
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29 | * Interface definition for class RenderTexture. A multi-format render to
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30 | * texture wrapper.
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31 | */
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32 | #ifndef __RENDERTEXTURE_HPP__
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33 | #define __RENDERTEXTURE_HPP__
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34 |
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35 | #include <GL/glew.h>
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36 | #ifdef _WIN32
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37 | #include <GL/wglew.h>
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38 | #else
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39 | #include <GL/glxew.h>
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40 | #endif
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41 |
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42 | class RenderTexture
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43 | {
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44 | public: // enums
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45 | enum UpdateMode
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46 | {
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47 | RT_RENDER_TO_TEXTURE,
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48 | RT_COPY_TO_TEXTURE
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49 | };
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50 |
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51 | public: // interface
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52 | RenderTexture(int iWidth, int iHeight,
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53 | bool bIsTexture = true,
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54 | bool bIsDepthTexture = false);
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55 | ~RenderTexture();
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56 |
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57 | //! Call this once before use. Set bShare to true to share lists, textures,
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58 | //! and program objects between the render texture context and the
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59 | //! current active GL context.
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60 | bool Initialize(bool bShare = true,
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61 | bool bDepth = false,
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62 | bool bStencil = false,
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63 | bool bMipmap = false,
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64 | bool bAnisoFilter = false,
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65 | unsigned int iRBits = 8,
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66 | unsigned int iGBits = 8,
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67 | unsigned int iBBits = 8,
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68 | unsigned int iABits = 8,
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69 | // Only Win32 has RT now, so only make it default there
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70 | #ifdef _WIN32
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71 | UpdateMode updateMode = RT_RENDER_TO_TEXTURE
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72 | #else
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73 | UpdateMode updateMode = RT_COPY_TO_TEXTURE
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74 | #endif
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75 | );
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76 |
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77 | // !Change the render texture resolution.
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78 | bool Reset(int iWidth, int iHeight, bool bIsTexture = true,
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79 | bool bIsDepthTexture = false);
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80 |
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81 | // !Begin drawing to the texture. (i.e. use as "output" texture)
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82 | bool BeginCapture();
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83 | // !End drawing to the texture.
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84 | bool EndCapture();
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85 |
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86 | // [Redge] 'const's added
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87 | // !Bind the texture to the active texture unit for use as an "input" texture
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88 | void Bind() const; // [Redge] moved definition to cpp-file (since it's longer now)
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89 | // !Bind the depth texture to the active texture unit for use as an "input" texture
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90 | void BindDepth() const; // [Redge] moved definition to cpp-file
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91 |
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92 | //! Enables the texture target appropriate for this render texture.
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93 | void EnableTextureTarget() const { if (_bInitialized) glEnable(_iTextureTarget); }
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94 | //! Disables the texture target appropriate for this render texture.
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95 | void DisableTextureTarget() const { if (_bInitialized) glDisable(_iTextureTarget); }
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96 | // [/Redge]
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97 |
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98 | //! Returns the texture ID. Useful in Cg applications.
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99 | unsigned int GetTextureID() const { return _iTextureID; }
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100 | //! Returns the depth texture ID. Useful in Cg applications.
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101 | unsigned int GetDepthTextureID() const { return _iDepthTextureID; }
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102 | //! Returns the texture target this texture is bound to.
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103 | unsigned int GetTextureTarget() const { return _iTextureTarget; }
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104 |
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105 | //! Returns the width of the offscreen buffer.
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106 | int GetWidth() const { return _iWidth; }
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107 | //! Returns the width of the offscreen buffer.
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108 | int GetHeight() const { return _iHeight; }
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109 |
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110 | //! Returns the number of red bits allocated.
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111 | int GetRedBits() const { return _iBits[0]; }
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112 | //! Returns the number of green bits allocated.
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113 | int GetGreenBits() const { return _iBits[1]; }
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114 | //! Returns the number of blue bits allocated.
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115 | int GetBlueBits() const { return _iBits[2]; }
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116 | //! Returns the number of alpha bits allocated.
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117 | int GetAlphaBits() const { return _iBits[3]; }
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118 | //! Returns the number of depth bits allocated.
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119 | int GetDepthBits() const { return _iBits[4]; }
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120 | //! Returns the number of stencil bits allocated.
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121 | int GetStencilBits() const { return _iBits[5]; }
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122 |
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123 | //! True if this RenderTexture has been properly initialized.
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124 | bool IsInitialized() const { return _bInitialized; }
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125 | //! True if this is a texture and not just an offscreen buffer.
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126 | bool IsTexture() const { return _bIsTexture; }
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127 | //! True if this is a depth texture and not just an offscreen buffer.
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128 | bool IsDepthTexture() const { return _bIsDepthTexture; }
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129 | //! True if this is a floating point buffer / texture.
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130 | bool IsFloatTexture() const { return _bFloat; }
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131 | //! True if this texture has non-power-of-two dimensions.
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132 | bool IsRectangleTexture() const { return _bRectangle; }
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133 | //! True if this pbuffer has a depth buffer.
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134 | bool HasDepth() const { return _bHasDepth; }
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135 | //! True if this pbuffer has a stencil buffer.
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136 | bool HasStencil() const { return _bHasStencil; }
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137 | //! True if this texture has mipmaps.
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138 | bool IsMipmapped() const { return _bMipmap; }
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139 | //! True if this texture is anisotropically filtered.
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140 | bool HasAnisoFilter() const { return _bAnisoFilter; }
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141 |
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142 | protected: // methods
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143 | bool _Invalidate();
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144 | #ifdef _WIN32
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145 | void _wglGetLastError();
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146 | #endif
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147 |
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148 | protected: // data
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149 | int _iWidth; // width of the pbuffer
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150 | int _iHeight; // height of the pbuffer
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151 |
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152 | bool _bIsTexture;
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153 | bool _bIsDepthTexture;
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154 | bool _bHasArbDepthTexture; // [Redge]
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155 |
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156 | UpdateMode _eUpdateMode;
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157 |
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158 | bool _bInitialized;
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159 |
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160 | unsigned int _iBits[6];
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161 | bool _bFloat;
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162 | bool _bRectangle;
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163 | bool _bHasDepth;
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164 | bool _bHasStencil;
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165 | bool _bMipmap;
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166 | bool _bAnisoFilter;
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167 |
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168 | #ifdef _WIN32
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169 | HDC _hDC; // Handle to a device context.
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170 | HGLRC _hGLContext; // Handle to a GL context.
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171 | HPBUFFERARB _hPBuffer; // Handle to a pbuffer.
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172 |
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173 | HDC _hPreviousDC;
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174 | HGLRC _hPreviousContext;
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175 | #else
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176 | Display *_pDpy;
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177 | GLXContext _hGLContext;
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178 | GLXPbuffer _hPBuffer;
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179 |
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180 | GLXDrawable _hPreviousDrawable;
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181 | GLXContext _hPreviousContext;
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182 | #endif
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183 |
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184 | GLenum _iTextureTarget;
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185 | unsigned int _iTextureID;
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186 | unsigned int _iDepthTextureID;
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187 |
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188 | unsigned short* _pPoorDepthTexture; // [Redge]
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189 | };
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190 |
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191 | #endif //__RENDERTEXTURE_HPP__
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