Line data Source code
1 :
2 : /* Copyright (c) 2009-2015, Stefan Eilemann <eile@equalizergraphics.com>
3 : * Cedric Stalder <cedric.stalder@gmail.com>
4 : * Daniel Nachbaur <danielnachbaur@gmail.com>
5 : *
6 : * This library is free software; you can redistribute it and/or modify it under
7 : * the terms of the GNU Lesser General Public License version 2.1 as published
8 : * by the Free Software Foundation.
9 : *
10 : * This library is distributed in the hope that it will be useful, but WITHOUT
11 : * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
12 : * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
13 : * details.
14 : *
15 : * You should have received a copy of the GNU Lesser General Public License
16 : * along with this library; if not, write to the Free Software Foundation, Inc.,
17 : * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 : */
19 :
20 : #ifndef EQUTIL_TEXTURE_H
21 : #define EQUTIL_TEXTURE_H
22 :
23 : #include <eq/frame.h> // Frame::Buffer enum
24 : #include <lunchbox/thread.h> // thread debug macro
25 :
26 : namespace eq
27 : {
28 : namespace util
29 : {
30 : namespace detail { class Texture; }
31 :
32 : /**
33 : * A wrapper around OpenGL textures.
34 : *
35 : * So far used by the Image and Compositor. The target is assumed to be
36 : * GL_TEXTURE_RECTANGLE_ARB or GL_TEXTURE_2D.
37 : */
38 : class Texture
39 : {
40 : public:
41 : /**
42 : * Construct a new Texture.
43 : *
44 : * A GLEWContext might be provided later using setGLEWContext(). It is
45 : * needed for operations using OpenGL extensions or version 1.2 or later
46 : * functions.
47 : * @version 1.0
48 : */
49 : EQ_API Texture( const unsigned target,
50 : const GLEWContext* const glewContext = 0 );
51 :
52 : /** Destruct the texture. @version 1.0 */
53 : EQ_API virtual ~Texture();
54 :
55 : /** @name Data Access. */
56 : //@{
57 : /** @return the target of the texture. @version 1.0 */
58 : EQ_API unsigned getTarget() const;
59 :
60 : /**
61 : * @internal
62 : * @return the compressor target corresponding to the texture target.
63 : */
64 : uint32_t getCompressorTarget() const;
65 :
66 : /**
67 : * @return the internal (GPU) pixel format of the texture.
68 : * @sa init()
69 : * @version 1.0
70 : */
71 : EQ_API unsigned getInternalFormat() const;
72 :
73 : /**
74 : * Set the external data format and type.
75 : *
76 : * @param format the OpenGL format.
77 : * @param type the OpenGL Type.
78 : * @version 1.0
79 : */
80 : EQ_API void setExternalFormat( const uint32_t format,
81 : const uint32_t type );
82 :
83 : /**
84 : * @return the external data format of the texture, e.g., GL_RGBA.
85 : * @version 1.0
86 : */
87 : EQ_API unsigned getFormat() const;
88 :
89 : /**
90 : * @return the external data type of the texture, e.g., GL_HALF_FLOAT.
91 : * @version 1.0
92 : */
93 : EQ_API unsigned getType() const;
94 :
95 : /** @return the OpenGL texture name. @version 1.0 */
96 : EQ_API unsigned getName() const;
97 :
98 : /** @return the current width. @version 1.0 */
99 : EQ_API int32_t getWidth() const;
100 :
101 : /** @return the current height. @version 1.0 */
102 : EQ_API int32_t getHeight() const;
103 :
104 : /** @return true if the texture can be bound. @version 1.0 */
105 : EQ_API bool isValid() const;
106 : //@}
107 :
108 : /** @name Operations. */
109 : //@{
110 : /**
111 : * Initialize an OpenGL texture.
112 : *
113 : * @param internalFormat the OpenGL texture internal format.
114 : * @param width the width of the texture.
115 : * @param height the height of the texture.
116 : * @version 1.0
117 : */
118 : EQ_API void init( const unsigned internalFormat, const int32_t width,
119 : const int32_t height );
120 :
121 : /**
122 : * Clear the texture, including deleting the GL texture name.
123 : * @version 1.0
124 : */
125 : EQ_API void flush();
126 :
127 : /** @internal Apply the given texture filtering parameter. */
128 : EQ_API void applyZoomFilter( const ZoomFilter filter ) const;
129 :
130 : EQ_API void applyWrap() const; //<! @internal
131 :
132 : /**
133 : * Copy the specified area from the current read buffer to the
134 : * texture at 0,0.
135 : * @version 1.0
136 : */
137 : EQ_API void copyFromFrameBuffer( const unsigned internalFormat,
138 : const fabric::PixelViewport& pvp );
139 :
140 : /** Copy the specified buffer to the texture at 0,0. @version 1.0 */
141 : EQ_API void upload( const int32_t width, const int32_t height,
142 : const void* ptr );
143 :
144 : /**
145 : * Copy the texture data from the GPU to the given memory address.
146 : * @version 1.0
147 : */
148 : EQ_API void download( void* buffer ) const;
149 :
150 : /** Bind the texture. @version 1.0 */
151 : EQ_API void bind() const;
152 :
153 : /** Create and bind a texture to the current FBO. @version 1.0 */
154 : EQ_API void bindToFBO( const unsigned target, const int32_t width,
155 : const int32_t height, const int32_t samples = 1 );
156 :
157 : /** Resize the texture. @version 1.0 */
158 : EQ_API void resize( const int32_t width, const int32_t height );
159 :
160 : /** Write the texture data as an rgb image file. @version 1.0 */
161 : EQ_API void writeRGB( const std::string& filename ) const;
162 : //@}
163 :
164 : EQ_API const GLEWContext* glewGetContext() const;
165 : EQ_API void setGLEWContext( const GLEWContext* context );
166 :
167 : /** @name Wrap existing GL textures */
168 : //@{
169 : /**
170 : * Flush the texture without deleting the GL texture name.
171 : * @version 1.0
172 : */
173 : EQ_API void flushNoDelete();
174 :
175 : /**
176 : * Use an OpenGL texture created externally.
177 : *
178 : * The previous GL texture, if any, is deallocated using flush(). The new
179 : * texture has to be of the correct target, size and internal format. The
180 : * texture is validated by this method.
181 : *
182 : * @param id The OpenGL texture name.
183 : * @param internalFormat the OpenGL texture internal format.
184 : * @param width the width of the texture.
185 : * @param height the height of the texture.
186 : * @version 1.0
187 : */
188 : EQ_API void setGLData( const unsigned id, const unsigned internalFormat,
189 : const int32_t width, const int32_t height );
190 : //@}
191 :
192 : private:
193 : Texture( const Texture& ) = delete;
194 : Texture& operator=( const Texture& ) = delete;
195 : detail::Texture* const _impl;
196 :
197 : /**
198 : * Set the internal pixel format of the texture, e.g., GL_RGBA16F.
199 : *
200 : * Automatically sets the external format and type to one matching the
201 : * internal format.
202 : *
203 : * @param internalFormat the OpenGL internal texture format.
204 : */
205 : void _setInternalFormat( const unsigned internalFormat );
206 :
207 : /** Generate, if needed, a GL texture name. */
208 : void _generate();
209 :
210 : /** Set the size of the texture, updating the _defined flag. */
211 : void _grow( const int32_t width, const int32_t height );
212 :
213 1648 : LB_TS_VAR( _thread );
214 : };
215 : /** Print the texture state to the given output stream. @version 1.7.1 */
216 : EQ_API std::ostream& operator << ( std::ostream&, const Texture& );
217 :
218 : }
219 : }
220 :
221 : #endif // EQUTIL_TEXTURE_H
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