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#246209 - 09/22/08 04:14 AM Render to texture using FBO on ATI Radeon 9550
devdept Frequent Contributor Registered: 12/19/05 Posts: 520 Loc: Italy	Hi All, Now I have a perfect working FBO based render to texture (on the developing machine) but can't see it working on the ATI Radeon 9550 / X1050 mentioned in the subject of this post. Of course all the necessary extensions are present on the second machine and OpenGL version is 2.1.7873. I attach the code to see if somebody discover something that can be improved. I wanted also to ask: 1) if I can expect a bug/missing functionality on the driver for this trivial FBO implementation 2) if there is a tool to analyze FBOs Thanks, Alberto Code: glBindTexture(GL_TEXTURE_2D, textureName); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureSize, textureSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, null); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); fbo = glGenFramebuffersEXT(); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo); glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureName, 0); // Checks FBO status int status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); ReportFboStatus(status); // Draws on texture DrawShadow();
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#246212 - 09/22/08 05:05 AM Re: Render to texture using FBO on ATI Radeon 9550 [Re: devdept]
sqrt[-1] Frequent Contributor Registered: 06/05/02 Posts: 910 Loc: Australia	I keep saying this to almost everyone that comes here (see previous posts) ENSURE, that you specify the third parameter of glTexImage2D as a known type, otherwise the driver will pick a format for you. (On ATI - it has a habit of choosing a 16bit texture format - which is probably not a good render target) So change your code to: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, textureSize, textureSize, 0, GL_RGBA, GL_UNSIGNED_BYTE, null); If that does not work, I don't know what is wrong...
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#246215 - 09/22/08 05:57 AM Re: Render to texture using FBO on ATI Radeon 9550 [Re: sqrt[-1]]
devdept Frequent Contributor Registered: 12/19/05 Posts: 520 Loc: Italy	sqrt[-1], Unfortunately it does not help. I was wondering if the choice to use: gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR); and not generating mipmaps can someway be a "non-standard" approach because the result is exacly like the one we obtained when forgot to use the gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR) call. Thanks, Alberto
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#246225 - 09/22/08 09:22 AM Re: Render to texture using FBO on ATI Radeon 9550 [Re: devdept]
V-man OpenGL Guru Registered: 02/21/00 Posts: 3440 Loc: Montreal, Canada	This is not standard fbo = glGenFramebuffersEXT(); It should be glGenFramebuffersEXT(1, &fb); Just try the example from which will work on every driver and GPU http://www.opengl.org/wiki/index.php/GL_EXT_framebuffer_object
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#246227 - 09/22/08 09:33 AM Re: Render to texture using FBO on ATI Radeon 9550 [Re: V-man]
devdept Frequent Contributor Registered: 12/19/05 Posts: 520 Loc: Italy	Yes V-man, It simply calls the following: Code: public static uint GenFramebuffersEXT() { uint[] result = new uint[1]; glGenFramebuffersEXT(1, result); return result[0]; } Thanks, Alberto
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#246234 - 09/22/08 12:22 PM Re: Render to texture using FBO on ATI Radeon 9550 [Re: devdept]
Ilian Dinev Frequent Contributor Registered: 01/26/08 Posts: 822 Loc: Bulgaria	This is one of the many reasons I abandoned that generation of ATi cards. RTT on R9600 never worked (be it opengl or dx9c), shaders were reported to be version 2.0a but even 2.0 did not work without crashes
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#246241 - 09/22/08 02:19 PM Re: Render to texture using FBO on ATI Radeon 9550 [Re: Ilian Dinev]
devdept Frequent Contributor Registered: 12/19/05 Posts: 520 Loc: Italy	Thanks Ilian, This is a good news for me, I was getting crazy aroung this issue. Thanks again, Alberto
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#246256 - 09/22/08 06:26 PM Re: Render to texture using FBO on ATI Radeon 9550 [Re: devdept]
sqrt[-1] Frequent Contributor Registered: 06/05/02 Posts: 910 Loc: Australia	I don't know what to say except I don't seem to have any troubles with FBO on ATI 9550 (last tested around January when I did my Light Indexed demo) Perhaps have a look at the Humus framework and see if he does something you don't? http://www.humus.name/ (I used his framework code)
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#246259 - 09/22/08 08:27 PM Re: Render to texture using FBO on ATI Radeon 9550 [Re: sqrt[-1]]
Ilian Dinev Frequent Contributor Registered: 01/26/08 Posts: 822 Loc: Bulgaria	Thanks for the info, sqrt[-1]. I had almost given-up FBO in some software of mine, as R9550 is a minimum target. I hadn't tested new drivers for it in almost 2 years, as it's been collecting dust in discrete form.
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#246261 - 09/23/08 02:03 AM Re: Render to texture using FBO on ATI Radeon 9550 [Re: sqrt[-1]]
devdept Frequent Contributor Registered: 12/19/05 Posts: 520 Loc: Italy	sqrt[-1], We are talking about RTT (render to texture) using FBO not FBO offscreen rendering. Where you using RTT with Humus? Thanks, Alberto
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