nCine::RHI::RDP::TileRecord struct

#include <nCine/Graphics/RHI/RDP/RdpTileRecord.h>

One tile of a tile-layer mesh in the packed form the RDP dispatch reads.

A tile layer reaches the RDP backend as a mesh of the TileMapMesh effect. Drawn with PrimitiveType::Points, its vertex buffer holds one of these per tile instead of vertices: where the tile goes, and which texels of the atlas chunk it shows - as the integers the RDP takes them as, so the dispatch neither scales normalized coordinates back up nor rounds them onto the texel grid. At 16 bytes it is a quarter of the two 8-float corners a tile took before, which matters on a CPU where every cache line a frame reads costs ~44 cycles.

Every tile is Size pixels and texels square, mapped 1:1 before the view's own scale. The mesh is produced only for this backend (the tile map's grouped emission and its N64 layer cache); every other backend is given ordinary vertices.

Public static variables

static std::int32_t Size constexpr

Width and height of every tile, in pixels and in texels.

static std::uint8_t FlipX constexpr

Horizontal flip, see Flags.

static std::uint8_t FlipY constexpr

Vertical flip, see Flags.

Public variables

float X

Top-left corner of the tile, in the space the command's transformation maps.

float Y

std::uint16_t TexX

Top-left texel of the tile in the atlas chunk the mesh samples.

std::uint16_t TexY

std::uint8_t Alpha

Alpha of the tile (it modulates the layer colour).

std::uint8_t Flags

Combination of FlipX and FlipY.

std::uint16_t Reserved