diff options
| author | Kenneth Graunke <[email protected]> | 2016-07-18 14:15:49 -0700 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2016-07-20 10:59:44 -0700 |
| commit | 0d77f08042b00cff81bebceb7877bc20f80c0965 (patch) | |
| tree | 8484fbb470c8cd7622e1940521447ab699163596 /src | |
| parent | 6b6727026228bd1eab715034416194317e4d0fc6 (diff) | |
anv: Fix near plane clipping on Gen7/7.5.
The Gen7/7.5 clip code used APIMODE_OGL, while the Gen8+ clip code used
APIMODE_D3D. The meaning hasn't changed, so one of these must be wrong.
It appears that the hardware documentation is completely wrong. It
claims that the "API Mode" bit means:
0h APIMODE_OGL NEAR_VP boundary == 0.0 (NDC)
1h APIMODE_D3D NEAR_VP boundary == -1.0 (NDC)
However, DirectX typically uses 0.0 for the near plane, while unextended
OpenGL uses -1.0. i965's gen6_clip_state.c uses APIMODE_D3D for the
GL_ZERO_TO_ONE case, so I believe the meanings are backwards from what
the documentation says.
Section 23.2 ("Primitive Clipping") of the Vulkan 1.0.21 specification
contains the following equations:
-w_c <= x_c <= w_c
-w_c <= y_c <= w_c
0 <= z_c <= w_c
This means that Vulkan follows D3D semantics.
Cc: "12.0" <[email protected]>
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/intel/vulkan/gen7_pipeline.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/intel/vulkan/gen7_pipeline.c b/src/intel/vulkan/gen7_pipeline.c index 01c04f3fe77..a50d9c70900 100644 --- a/src/intel/vulkan/gen7_pipeline.c +++ b/src/intel/vulkan/gen7_pipeline.c @@ -124,7 +124,7 @@ genX(graphics_pipeline_create)( clip.FrontWinding = vk_to_gen_front_face[rs_info->frontFace], clip.CullMode = vk_to_gen_cullmode[rs_info->cullMode], clip.ClipEnable = !(extra && extra->use_rectlist), - clip.APIMode = APIMODE_OGL, + clip.APIMode = APIMODE_D3D, clip.ViewportXYClipTestEnable = true, clip.ViewportZClipTestEnable = !pipeline->depth_clamp_enable, clip.ClipMode = CLIPMODE_NORMAL, |