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714b4f6184
In i965 Gen7, Mesa has for a long time used the "depth coordinate offset X/Y" settings (in 3DSTATE_DEPTH_BUFFER) to cause the GPU to render to miplevels other than 0. Unfortunately, this doesn't work, because these offsets must be aligned to multiples of 8, and miplevels in the depth buffer are only guaranteed to be aligned to multiples of 4. When the offsets aren't aligned to a multiple of 8, the GPU sometimes hangs. As a temporary measure, to avoid GPU hangs, this patch smashes the 3 LSB's of "depth coordinate offset X/Y" to 0. This results in incorrect rendering to mipmapped depth textures, but that seems like a reasonable stopgap while we figure out a better solution. Avoids GPU hangs in piglit test "depthstencil-render-miplevels" at texture sizes that are not powers of 2. Reviewed-by: Chad Verace <chad.versace@linux.intel.com> |
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