<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_VERIFIED bz_closed" title="VERIFIED NOTOURBUG - Regression: GLB 2.7 & Glmark-2 GLES versions segfault due to linker precision error (259fc505) on dead variable" href="https://bugs.freedesktop.org/show_bug.cgi?id=97532#c35">Comment # 35</a> on <a class="bz_bug_link bz_status_VERIFIED bz_closed" title="VERIFIED NOTOURBUG - Regression: GLB 2.7 & Glmark-2 GLES versions segfault due to linker precision error (259fc505) on dead variable" href="https://bugs.freedesktop.org/show_bug.cgi?id=97532">bug 97532</a> from <a class="email" href="mailto:tfiga@chromium.org" title="Tomasz Figa <tfiga@chromium.org>"> Tomasz Figa</a> <pre>By the way, it is not true that GLES 2.x didn't require this check, at least according to following thread: <a href="https://github.com/AnalyticalGraphicsInc/cesium/issues/817">https://github.com/AnalyticalGraphicsInc/cesium/issues/817</a> It refers to GLSL ES 1.00 specification (<a href="http://www.khronos.org/registry/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf">http://www.khronos.org/registry/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf</a>) and quotes the following part: > Do precision qualifiers for uniforms need to match? > Option 1: Yes. > Uniforms are defined to behave as if they are using the same storage in the > vertex and fragment processors and may be implemented this way. > If uniforms are used in both the vertex and fragment shaders, developers > should be warned if the precisions are different. Conversion of precision > should never be implicit. > Option 2: No. > Uniforms may be used by both shaders but the same precision may not be > available in both so there is a justification for allowing them to be > different. > Using the same uniform in the vertex and fragment shaders will always require > the precision to be specified in the vertex shader (since the default > precision is highp). This is an unnecessary burden on developers. > RESOLUTION: Yes, precision qualifiers for uniforms must match.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>