diff options
| author | Dave Airlie <[email protected]> | 2019-10-09 13:07:04 +1000 |
|---|---|---|
| committer | Dave Airlie <[email protected]> | 2019-10-11 00:32:15 +0000 |
| commit | 0c09df52e10f0339973f44cef68ff5e237720c8a (patch) | |
| tree | 73c16a10be2214f4762ee734b63b356f0d2095ce /src/gallium/docs | |
| parent | 1e65757f4e8283f136924f7594485ea4440c7e78 (diff) | |
gallium: add a a new cap for changing the TGSI TG4 instruction encoding
Accessing the TG4 component via immediates in the llvmpipe backend is quite
messy (like really messy). Roland suggested we change the instruction encoding,
so introduce a cap to allow the component to be selected to be store in the
sampler swizzle, which should be otherwise unused.
I could probably switch all drivers over, but virgl would need some work that
I'd prefer not to rush it.
Signed-off-by: Dave Airlie <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/screen.rst | 1 | ||||
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst index 9acab6fafc5..1c402b03391 100644 --- a/src/gallium/docs/source/screen.rst +++ b/src/gallium/docs/source/screen.rst @@ -558,6 +558,7 @@ The integer capabilities: * ``PIPE_CAP_GL_SPIRV``: True if the driver supports ARB_gl_spirv extension. * ``PIPE_CAP_GL_SPIRV_VARIABLE_POINTERS``: True if the driver supports Variable Pointers in SPIR-V shaders. * ``PIPE_CAP_DEMOTE_TO_HELPER_INVOCATION``: True if driver supports demote keyword in GLSL programs. +* ``PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE``: True if driver wants the TG4 component encoded in sampler swizzle rather than as a separate source. .. _pipe_capf: diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index d58b23f024b..e053e821ecd 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -962,14 +962,22 @@ XXX doesn't look like most of the opcodes really belong here. require another CAP is hw can do it natively. For now we lower that before TGSI. + PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE changes the encoding so that component + is stored in the sampler source swizzle x. + .. math:: coord = src0 + (without TGSI_TG4_COMPONENT_IN_SWIZZLE) component = src1 dst = texture\_gather4 (unit, coord, component) + (with TGSI_TG4_COMPONENT_IN_SWIZZLE) + dst = texture\_gather4 (unit, coord) + component is encoded in sampler swizzle. + (with SM5 - cube array shadow) .. math:: |