#[repr(u8)]pub enum Primitive {
PointList,
LineList,
LineStrip,
TriangleList,
TriangleStrip,
LineListAdjacency,
LineStripAdjacency,
TriangleListAdjacency,
TriangleStripAdjacency,
PatchList(u8),
}Expand description
Describes what geometric primitives are created from vertex data.
Variants§
PointList
Each vertex represents a single point.
LineList
Each pair of vertices represent a single line segment. For example, with [a, b, c, d, e], a and b form a line, c and d form a line, and e is discarded.
LineStrip
Every two consecutive vertices represent a single line segment. Visually forms a “path” of
lines, as they are all connected. For example, with [a, b, c], a and b form a line
line, and b and c form a line.
TriangleList
Each triplet of vertices represent a single triangle. For example, with [a, b, c, d, e],
a, b, and c form a triangle, d and e are discarded.
TriangleStrip
Every three consecutive vertices represent a single triangle. For example, with [a, b, c, d], a, b, and c form a triangle, and b, c, and d form a triangle.
LineListAdjacency
Each quadtruplet of vertices represent a single line segment with adjacency information.
For example, with [a, b, c, d], b and c form a line, and a and d are the adjacent
vertices.
LineStripAdjacency
Every four consecutive vertices represent a single line segment with adjacency information.
For example, with [a, b, c, d, e], [a, b, c, d] form a line segment with adjacency, and
[b, c, d, e] form a line segment with adjacency.
TriangleListAdjacency
Each sextuplet of vertices represent a single traingle with adjacency information. For
example, with [a, b, c, d, e, f], a, c, and e form a traingle, and b, d, and
f are the adjacent vertices, where b is adjacent to the edge formed by a and c, d
is adjacent to the edge c and e, and f is adjacent to the edge e and a.
TriangleStripAdjacency
Every even-numbered vertex (every other starting from the first) represents an additional
vertex for the triangle strip, while odd-numbered vertices (every other starting from the
second) represent adjacent vertices. For example, with [a, b, c, d, e, f, g, h], [a, c, e, g] form a triangle strip, and [b, d, f, h] are the adjacent vertices, where b, d,
and f are adjacent to the first triangle in the strip, and d, f, and h are adjacent
to the second.
PatchList(u8)
Patch list, used with shaders capable of producing primitives on their own (tessellation)