Commit f9d261f5747c25043be80e97601e586ab1855aa7
2021-08-25T10:23:48
Translator: Don't promote precision from initializer Take the following GLSL code: precision mediump float; uniform highp float u; float x = u; When `x` is declared, its precision is mediump due to `precision mediump float`. Its initializer (`u`) however is highp. Previously, ANGLE generated the following code to ensure the precision of the initializer is applied to the variable: highp float x = u; Compiling the same code with glslang and looking at the SPIR-V (both SPIR-V for OpenGL and SPIR-V for Vulkan), such a promotion is not done. The generated SPIR-V is equivalent to: mediump float x = u; This change aligns ANGLE's output with glslang's by outputting the precision of the variable itself instead of the precision of the assignment (which is highp due to promotion from the two operands). Bug: angleproject:4889 Bug: angleproject:6132 Change-Id: I6f338a865c0a7710329fc13bc171fd245dd30b31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3118965 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>