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Reorder TileLayer. (#5638)

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Despite the split of TileSpec into TileDef and TileLayer, the
TileLayer struct is still 66 bytes large, and doesn't fit in
a single cacheline.

I'm moving the color member to cacheline 2, in the hope that it
is less used and the compiler loads all the hot members in a single
cacheline instead. Only color sits now in cacheline 2, all the
other members are in cacheline 1.

Note: is_color is probably rarely set, most nodes will likely
not use hardware coloring, but this may change in the future.
Ideally, this class is shrunk to 64 bytes.
This commit is contained in:
Auke Kok 2017-04-29 00:16:32 -07:00 committed by Loïc Blot
parent 19960e26c6
commit 1ecc8756bc
1 changed files with 26 additions and 21 deletions
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47
src/client/tile.h
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@ -201,8 +201,12 @@ struct TileLayer
{
TileLayer():
texture(NULL),
normal_texture(NULL),
flags_texture(NULL),
shader_id(0),
texture_id(0),
color(),
animation_frame_length_ms(0),
animation_frame_count(1),
material_type(TILE_MATERIAL_BASIC),
material_flags(
//0 // <- DEBUG, Use the one below
@ -210,12 +214,8 @@ struct TileLayer
MATERIAL_FLAG_TILEABLE_HORIZONTAL|
MATERIAL_FLAG_TILEABLE_VERTICAL
),
shader_id(0),
normal_texture(NULL),
flags_texture(NULL),
animation_frame_length_ms(0),
animation_frame_count(1),
has_color(false)
has_color(false),
color()
{
}
@ -286,27 +286,32 @@ struct TileLayer
&& (material_flags & MATERIAL_FLAG_TILEABLE_VERTICAL);
}
// Ordered for size, please do not reorder
video::ITexture *texture;
video::ITexture *normal_texture;
video::ITexture *flags_texture;
u32 shader_id;
u32 texture_id;
u16 animation_frame_length_ms;
u8 animation_frame_count;
u8 material_type;
u8 material_flags;
//! If true, the tile has its own color.
bool has_color;
std::vector<FrameSpec> frames;
/*!
* The color of the tile, or if the tile does not own
* a color then the color of the node owning this tile.
*/
video::SColor color;
// Material parameters
u8 material_type;
u8 material_flags;
u32 shader_id;
video::ITexture *normal_texture;
video::ITexture *flags_texture;
// Animation parameters
u16 animation_frame_length_ms;
u8 animation_frame_count;
//! If true, the tile has its own color.
bool has_color;
std::vector<FrameSpec> frames;
};
/*!