On one side, when emitting 3DSTATE_SF, VertexSubPixelPrecisionSelect is
used to select between 8 bit subpixel precision (value 0) or 4 bit
subpixel precision (value 1). As this value is not set, means it is
taking the value 0, so 8 bit are used.
On the other side, in the Vulkan CTS tests, if the reference rasterizer,
which uses 8 bit precision, as it is used to check what should be the
expected value for the tests, is changed to use 4 bit as ANV was
advertising so far, some of the tests will fail.
So it seems ANV is actually using 8 bits.
v2: explicitly set 3DSTATE_SF::VertexSubPixelPrecisionSelect (Jason)
v3: use _8Bit definition as value (Jason)
CC: Jason Ekstrand <ja...@jlekstrand.net>
CC: Kenneth Graunke <kenn...@whitecape.org>
Signed-off-by: Juan A. Suarez Romero <jasua...@igalia.com>
---
src/intel/vulkan/anv_device.c | 2 +-
src/intel/vulkan/genX_pipeline.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index 3120865466a..95224407318 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -1095,7 +1095,7 @@ void anv_GetPhysicalDeviceProperties(
16 * devinfo->max_cs_threads,
16 * devinfo->max_cs_threads,
},
- .subPixelPrecisionBits = 4 /* FIXME */,
+ .subPixelPrecisionBits = 8,
.subTexelPrecisionBits = 4 /* FIXME */,
.mipmapPrecisionBits = 4 /* FIXME */,
.maxDrawIndexedIndexValue = UINT32_MAX,
diff --git a/src/intel/vulkan/genX_pipeline.c b/src/intel/vulkan/genX_pipeline.c
index 6255e5d83c5..3d36bb773e1 100644
--- a/src/intel/vulkan/genX_pipeline.c
+++ b/src/intel/vulkan/genX_pipeline.c
@@ -464,6 +464,7 @@ emit_rs_state(struct anv_pipeline *pipeline,
sf.TriangleStripListProvokingVertexSelect = 0;
sf.LineStripListProvokingVertexSelect = 0;
sf.TriangleFanProvokingVertexSelect = 1;
+ sf.VertexSubPixelPrecisionSelect = _8Bit;
const struct brw_vue_prog_data *last_vue_prog_data =
anv_pipeline_get_last_vue_prog_data(pipeline);
--
2.20.1
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