<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL, KBL] texture misrender in The Talos Principle" href="https://bugs.freedesktop.org/show_bug.cgi?id=96624#c11">Comment # 11</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SKL, KBL] texture misrender in The Talos Principle" href="https://bugs.freedesktop.org/show_bug.cgi?id=96624">bug 96624</a> from <a class="email" href="mailto:sergii.romantsov@globallogic.com" title="Sergii Romantsov <sergii.romantsov@globallogic.com>"> Sergii Romantsov</a> <pre>Created <a href="attachment.cgi?id=139842" name="attach_139842" title="Workaround for trace Talos_flicker3_trim2.trace.xz">attachment 139842</a> <a href="attachment.cgi?id=139842&action=edit" title="Workaround for trace Talos_flicker3_trim2.trace.xz">[details]</a> <a href='page.cgi?id=splinter.html&bug=96624&attachment=139842'>[review]</a> Workaround for trace Talos_flicker3_trim2.trace.xz Investigation was done with trace <a href="https://drive.google.com/file/d/0Bz8fw_SGGDzsbk81T0hKMFo1V2s/view?usp=sharing">https://drive.google.com/file/d/0Bz8fw_SGGDzsbk81T0hKMFo1V2s/view?usp=sharing</a> Workarounds (standalone): 1. Only for that trace (helps not for all cases, so sometimes still problem will happen): 96624_wa.diff 2. To use LIBGL_ALWAYS_SOFTWARE=true (swrast) More investigations: 1. Used simplified shaders for program 1496 (vertex shader 1286, fragment shader 1296): 1.1. VS_f5145e822d6ab91eba69ffa69464742d03d0545a.glsl: - Left computation of vVexPosAbs - Assign vMaskLightUV.xy by vLightUV.xy - Avoid any more computations 1.2. FS_a6439012ab28d0bb9cc17c615c9b0487158f9cb1.glsl: - Use vMaskLightUV.xy to compute vOutColor.rgb - Avoid any more computations 2. Used array buffers: 2.1. 254490 @0 glBindBuffer(target = GL_ELEMENT_ARRAY_BUFFER, buffer = 1139) 2.2. 254517 @0 glBindBuffer(target = GL_ARRAY_BUFFER, buffer = 1140) 2. Final observation: 2.1. For vertex shader data in array vLightUV are invalid. 2.2. Reading of data by DRM_IOCTL_I915_GEM_PREA (for buffers 1139 and 1140) on differnet stages shows that data in arrays are not changed. 3. Temporal conclusion: 3.1. Or some invalid offsets/addresses computed 3.2. Or before glDraw*-calls missed some flushing/caching/command 4. Questions: 4.1. Is it possible to debug by which address vertex shader reads vLightUV? 4.2. Any more ideas?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>