agg render buffer and opengl
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agg render buffer and opengl
by Jim Crafton
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I'm contemplating making an image editor of sorts, something that's
based on another library of mine that roughly duplicates Apple's CoreImage on Windows. It uses OpenGL to draw images and GLSL for filters that can added to an image for processing the pixels. What I'd like to do is also use AGG to draw on the opengl image, which is just a texture map. Any advice on how best to approach this? Is it just a matter of creating a texture and dumping the contents of AGG's render_buffer onto the texture bits? Thanks! Jim ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Vector-agg-general mailing list Vector-agg-general@... https://lists.sourceforge.net/lists/listinfo/vector-agg-general |
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Re: agg render buffer and opengl
by Balakumar-3
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Possible. U can use the memory provided to agg::rendering_buffer. Make
pixel format for the render buffer and texture are same. unsigned long *buffer = new unsigned long[width*height*4]; memset(buffer, 0, width * height* 4); agg::rendering_buffer r_buf_(buffer, width, height, width * 4); //Do ur rendreing //Copy buffer to texture Jim Crafton wrote: > I'm contemplating making an image editor of sorts, something that's > based on another library of mine that roughly duplicates Apple's > CoreImage on Windows. It uses OpenGL to draw images and GLSL for > filters that can added to an image for processing the pixels. What I'd > like to do is also use AGG to draw on the opengl image, which is just > a texture map. Any advice on how best to approach this? Is it just a > matter of creating a texture and dumping the contents of AGG's > render_buffer onto the texture bits? > > Thanks! > > Jim > > ------------------------------------------------------------------------------ > Come build with us! The BlackBerry(R) Developer Conference in SF, CA > is the only developer event you need to attend this year. Jumpstart your > developing skills, take BlackBerry mobile applications to market and stay > ahead of the curve. Join us from November 9 - 12, 2009. Register now! > http://p.sf.net/sfu/devconference > _______________________________________________ > Vector-agg-general mailing list > Vector-agg-general@... > https://lists.sourceforge.net/lists/listinfo/vector-agg-general > > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Vector-agg-general mailing list Vector-agg-general@... https://lists.sourceforge.net/lists/listinfo/vector-agg-general |
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Re: agg render buffer and opengl
by Stephan Assmus
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On 2009-11-03 at 19:16:25 [+0100], Jim Crafton <jim.crafton@...> wrote: > I'm contemplating making an image editor of sorts, something that's based > on another library of mine that roughly duplicates Apple's CoreImage on > Windows. It uses OpenGL to draw images and GLSL for filters that can > added to an image for processing the pixels. What I'd like to do is also > use AGG to draw on the opengl image, which is just a texture map. Any > advice on how best to approach this? Is it just a matter of creating a > texture and dumping the contents of AGG's render_buffer onto the texture > bits? Depending on your setup, it may be faster to render in main memory and copy the buffer into the textture. But it could also be possible to attach the agg::render_buffer directly to the texture buffer. I assume you need to lock the OpenGL context during rendering. And this will involve read-operations, which could very well be slow if the texture lives in graphics memory. Another option may be to declare the texture such that the graphics chip pulls it itself from main memory. That could be faster than manually copying the buffer into the texture allocated in graphics memory. For how to do this exactly, you will need to look into OpenGL documentation, I am just assuming this is possible and advise from my own experience in similar situations, but not with OpenGL in particular. (My experience is with using old-school video overlays, but those live in video memory too, so the situation is similar with regard to what is fast and what is slow if you attach AGG to it.) Best regards, -Stephan ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Vector-agg-general mailing list Vector-agg-general@... https://lists.sourceforge.net/lists/listinfo/vector-agg-general |
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Re: agg render buffer and opengl
by Jim Crafton
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Thanks for the info!
Cheers Jim ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Vector-agg-general mailing list Vector-agg-general@... https://lists.sourceforge.net/lists/listinfo/vector-agg-general |
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Re: agg render buffer and opengl
by Pete Bannister
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Its easy enough - render in memory and give it to GL.
I dont think you have direct access to the hadrware buffer anyway. Rough example: std::vector<GLUint> textures_; ... textures_.resize(tex_count); glGenTextures(tex_count, &textures_[0]); for (size_t n = 0; n < tex_count; ++n) { glBindTexture(GL_TEXTURE_2D, textures_[n]); std::vector<unsigned char> image(width * height * 3); RenderMyImage(image, width, height); glTexImage2D( GL_TEXTURE_2D, // GLenum target, 0, // GLint level, 3, // GLint internalformat, width, // GLsizei width, height, // GLsizei height, 0, // GLint border, GL_RGB, // GLenum format, GL_UNSIGNED_BYTE, // GLenum type, image // const GLvoid *pixels ); } Stephan Assmus wrote: On 2009-11-03 at 19:16:25 [+0100], Jim Crafton jim.crafton@... wrote: ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Vector-agg-general mailing list Vector-agg-general@... https://lists.sourceforge.net/lists/listinfo/vector-agg-general |
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