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gallium: use a packed enum to make pipe_prim_mode 1-byte large with __GNUC__

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Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12480>
This commit is contained in:
Marek Olšák 2021-08-20 10:46:54 -04:00
parent 06ca0fc3b1
commit 8886bf9a47
3 changed files with 13 additions and 1 deletions
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5
src/gallium/auxiliary/util/u_prim.c
View file

@ -27,6 +27,11 @@
const char *
u_prim_name(enum pipe_prim_type prim)
{
#if defined(__GNUC__)
/* Check that the enum is packed: */
STATIC_ASSERT(sizeof(enum pipe_prim_type) == 1);
#endif
static const struct debug_named_value names[] = {
DEBUG_NAMED_VALUE(PIPE_PRIM_POINTS),
DEBUG_NAMED_VALUE(PIPE_PRIM_LINES),

2
src/gallium/include/pipe/p_defines.h
View file

@ -575,7 +575,7 @@ enum pipe_prim_type {
PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY,
PIPE_PRIM_PATCHES,
PIPE_PRIM_MAX,
};
} ENUM_PACKED;
/**
* Tessellator spacing types

7
src/util/macros.h
View file

@ -327,6 +327,13 @@ do { \
#define ATTRIBUTE_NOINLINE
#endif
/* Use as: enum name { X, Y } ENUM_PACKED; */
#if defined(__GNUC__)
#define ENUM_PACKED __attribute__((packed))
#else
#define ENUM_PACKED
#endif
/**
* Check that STRUCT::FIELD can hold MAXVAL. We use a lot of bitfields