<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Implement SSBOs in GLSL front-end and i965" href="https://bugs.freedesktop.org/show_bug.cgi?id=89597#c30">Comment # 30</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Implement SSBOs in GLSL front-end and i965" href="https://bugs.freedesktop.org/show_bug.cgi?id=89597">bug 89597</a> from <a class="email" href="mailto:siglesias@igalia.com" title="Samuel Iglesias <siglesias@igalia.com>"> Samuel Iglesias</a> <pre>I have been working on the .length() calculation of unsized arrays in SSBOs. As it was said in <a href="show_bug.cgi?id=89597#c2">comment 2</a>, the size of the allocated buffer by the GPU can be queried by resinfo message. I have that code working fine with that approach but recently I discovered an inconsistency: Intel driver is allocating internally buffers of multiples of 4k (see buffer object returned by intel_bufferobj_buffer() in brw_upload_ubo_surfaces()), so if the user wants a buffer of size 32 bytes, it would allocate a buffer of 4096 bytes. Then, the emitted resinfo message returns 4096. However if the application executes glGetBufferParameteriv(GL_BUFFER_SIZE) it will return 32 bytes and I suppose this is the buffer size value that should be used for unsized array's length calculations. How can I fix this inconsistency? Should I modify intel_bufferobj_buffer() to return a buffer object of the same size it was asked for and not round it up to multiples of 4k? Is there a good reason for that behavior? What do you think?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>