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shader_recompiler: Add subpixel offset for correct rounding at ImageGather

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On AMD a subpixel offset of 1/512 of the texel size is applied to the texture coordinates at a ImageGather call to ensure the rounding at the texel centers is done the same way as in Maxwell or other Nvidia architectures.
See https://www.reedbeta.com/blog/texture-gathers-and-coordinate-precision/ for more details why this might be necessary.

This should fix shadow artifacts at object edges in Zelda: Breath of the Wild (#9957, #6956).
This commit is contained in:
Wollnashorn
2023-04-05 01:29:46 +02:00
parent bbdfe1fab1
commit 780240e697
9 changed files with 86 additions and 0 deletions
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src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
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@ -329,6 +329,7 @@ PipelineCache::PipelineCache(RasterizerVulkan& rasterizer_, const Device& device
.lower_left_origin_mode = false,
.need_declared_frag_colors = false,
.need_gather_subpixel_offset = device.NeedsGatherSubpixelOffset(),
.has_broken_spirv_clamp = driver_id == VK_DRIVER_ID_INTEL_PROPRIETARY_WINDOWS,
.has_broken_spirv_position_input = driver_id == VK_DRIVER_ID_QUALCOMM_PROPRIETARY,