102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
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GLuint makeTextureTarget ( GLuint textureHandle ) ;
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void renderTo2DTexture ( GLuint fboHandle ) ;
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void renderToFrameBuffer () ;
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// #define NEED_STENCIL_BUFFER 1
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// #define NEED_DEPTH_BUFFER 1
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enum fboDataType
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{
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#ifndef GL_BYTE
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FBO_BYTE = 0x1400,
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FBO_UNSIGNED_BYTE = 0x1401,
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FBO_SHORT = 0x1402,
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FBO_UNSIGNED_SHORT = 0x1403,
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FBO_INT = 0x1404,
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FBO_UNSIGNED_INT = 0x1405,
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FBO_FLOAT = 0x1406,
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FBO_DOUBLE = 0x140A,
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#else
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FBO_BYTE = GL_BYTE,
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FBO_UNSIGNED_BYTE = GL_UNSIGNED_BYTE,
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FBO_SHORT = GL_SHORT,
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FBO_UNSIGNED_SHORT = GL_UNSIGNED_SHORT,
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FBO_INT = GL_INT,
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FBO_UNSIGNED_INT = GL_UNSIGNED_INT,
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FBO_FLOAT = GL_FLOAT,
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FBO_DOUBLE = GL_DOUBLE,
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#endif
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#ifndef GL_HALF_FLOAT_NV
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FBO_HALF = 0x140B
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#else
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FBO_HALF = GL_HALF_FLOAT_NV
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#endif
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} ;
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class FrameBufferObject
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{
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int width ;
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int height ;
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int ncomps ;
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fboDataType type ;
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GLenum format ;
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GLenum iformat ;
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GLuint textureHandle ;
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GLuint fboHandle ;
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void fillTexture ( void *data ) ;
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void fetchTexture ( void *data ) ;
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public:
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FrameBufferObject ( int _width, /* Must be a power of two! */
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int _height, /* Must be a power of two! */
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int _numComponents, /* 1, 2, 3 or 4 only! */
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fboDataType _type ) ;
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void makeDestination ()
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{
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#ifndef NEED_DEPTH_BUFFER
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glDepthMask ( 0 ) ;
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#endif
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#ifndef NEED_STENCIL_BUFFER
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glStencilMask ( 0 ) ;
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#endif
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glBindFramebufferEXT ( GL_FRAMEBUFFER_EXT, fboHandle ) ;
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}
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void use ( int texture_unit )
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{
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glActiveTexture ( GL_TEXTURE0 + texture_unit ) ;
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glBindTexture ( GL_TEXTURE_2D, textureHandle ) ;
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}
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void prepare ( bool clear = false ) ;
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void fill () ;
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void paint ( bool clear = false ) { prepare ( clear ) ; fill () ; }
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void fillTexture ( float *data ) ;
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void fillTexture ( unsigned short *data ) ;
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void fillTexture ( unsigned char *data ) ;
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void fetchTexture ( float *data ) ;
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void fetchTexture ( unsigned short *data ) ;
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void fetchTexture ( unsigned char *data ) ;
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} ;
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inline void restoreFrameBuffer ()
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{
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glBindFramebufferEXT ( GL_FRAMEBUFFER_EXT, 0 ) ;
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#ifndef NEED_DEPTH_BUFFER
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glDepthMask ( 1 ) ;
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#endif
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#ifndef NEED_STENCIL_BUFFER
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glStencilMask ( 1 ) ;
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#endif
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}
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