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POWhen using a GL_RGBA16F_ARB-texture, it contains just crap, but I get no error message
 

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  1. POWhen using a GL_RGBA16F_ARB-texture, it contains just crap, but I get no error message
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    <p>I generate a texture like this:</p> <pre><code>GLuint id; glGenTextures(1, &amp;id); glBindTexture(GL_TEXTURE_2D, id); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA16, //GL_RGBA16F_ARB, //&lt; Won't work 256, 256, 0, GL_RGBA, GL_FLOAT, NULL ); glBindTexture(GL_TEXTURE_2D, 0); </code></pre> <p>I attach it to a framebuffer object (FBO) for rendering to. All of this works like a charm when I set the internal format to <code>GL_RGBA16</code>. However, I need a higher dynamic range and was thinking that <code>GL_RGBA16F_ARB</code> might do the trick.</p> <p>Unfortunately, if I replace <code>GL_RGBA16</code> with <code>GL_RGBA16F_ARB</code> in the code given above, the texture seems to stop working. Nothing I try to render to the FBO/texture sticks, and when I use the texture it contains random garbage. (A lot of purple, as it turns out) This would not be so frustrating if I had gotten an error message hinting at what might be wrong, but I can't seem to find one. In other words, <code>glGetError()</code> returns <code>0</code> after the <code>glTexImage2D</code>-call, and <code>glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT)</code> returns <code>GL_FRAMEBUFFER_COMPLETE_EXT</code> when I have attached the texture</p> <p>I haven't messed with <code>glClampColorARB(...)</code> ... yet :)</p> <ol> <li>Have I forgotten to check for errors in a place/way that I haven't thought of?</li> <li>Do <code>GL_RGBA16F_ARB</code>-textures require any special treatment that I haven't given?</li> <li>Is there anything else that might be wrong?</li> </ol> <p>I'm stumped, since everything works smoothly with <code>GL_RGBA16</code>... :(</p> <p><strong>EDIT:</strong> When using <code>GL_RGBA16F_ARB</code>, the first frame I try to render to screen doesn't make it. Seems to me that I should be getting an error message somewhere..?</p> <p><strong>EDIT:</strong> By inspecting ShadowIce's working code example I figured out that the problems disappeared if I changed the <em>depth buffer</em> on my FBO, and give <code>glRenderBufferStorageEXT(...)</code> <code>GL_DEPTH_COMPONENT24</code> as its second parameter, rather than <code>GL_DEPTH_COMPONENT16</code>. I have no idea <em>why</em> this works, but apparently it does work.</p> <p>Also, ShadowIce's code breaks like mine if I do the opposite substitution there.</p>
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    1. USMagnus Hoff
    1. USMagnus Hoff
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      1. USJohannes Hoff
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    1. COHow are you actually filling the texture?
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      1. POWhen using a GL_RGBA16F_ARB-texture, it contains just crap, but I get no error message
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    2. COI am attaching it to an FBO and rendering to it.
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      1. USMagnus Hoff
 

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