Copyright | (c) Sven Panne 2002-2013, Tobias Markus 2015 |
---|---|
License | BSD3 |
Maintainer | Sven Panne <svenpanne@gmail.com> |
Stability | stable |
Portability | portable |
Safe Haskell | None |
Language | Haskell2010 |
This module corresponds to section 10.1 (Primitive Types) of the OpenGL 4.4 specs.
Primitive Modes
data PrimitiveMode Source
Specification of the way the vertices given during renderPrimitive
are
interpreted. In the description of the constructors, n is an integer count
starting at one, and N is the total number of vertices specified.
Points | Treats each vertex as a single point. Vertex n defines point n. N points are drawn. |
Lines | Treats each pair of vertices as an independent line segment. Vertices 2n-1 and 2n define line n. N/2 lines are drawn. |
LineLoop | Draws a connected group of line segments from the first vertex to the last, then back to the first. Vertices n and n+1 define line n. The last line, however, is defined by vertices N and 1. N lines are drawn. |
LineStrip | Draws a connected group of line segments from the first vertex to the last. Vertices n and n+1 define line n. N-1 lines are drawn. |
Triangles | Treats each triplet of vertices as an independent triangle. Vertices 3n-2, 3n-1, and 3n define triangle n. N/3 triangles are drawn. |
TriangleStrip | Draws a connected group of triangles. One triangle is defined for each vertex presented after the first two vertices. For odd n, vertices n, n+1, and n+2 define triangle n. For even n, vertices n+1, n, and n+2 define triangle n. N-2 triangles are drawn. |
TriangleFan | Draws a connected group of triangles. One triangle is defined for each vertex presented after the first two vertices. Vertices 1, n+1, and n+2 define triangle n. N-2 triangles are drawn. |
Quads | Treats each group of four vertices as an independent quadrilateral. Vertices 4n-3, 4n-2, 4n-1, and 4n define quadrilateral n. N/4 quadrilaterals are drawn. |
QuadStrip | Draws a connected group of quadrilaterals. One quadrilateral is defined for each pair of vertices presented after the first pair. Vertices 2n-1, 2n, 2n+2, and 2n+1 define quadrilateral n. N/2-1 quadrilaterals are drawn. Note that the order in which vertices are used to construct a quadrilateral from strip data is different from that used with independent data. |
Polygon | Draws a single, convex polygon. Vertices 1 through N define this polygon. |
Patches | Only used in conjunction with tessellation. The number of vertices per
patch can be set with |
Patches (Tessellation)
patchVertices :: StateVar GLsizei Source
patchVertices
is the number of vertices per patch primitive.
An InvalidValue
is generated if
patchVertices
is set to a value less than or equal to zero or greater
than the implementation-dependent maximum value maxPatchVertices
.
maxPatchVertices :: GettableStateVar GLsizei Source
Contains the maximumum number of vertices in a single patch.
patchDefaultOuterLevel :: StateVar (GLfloat, GLfloat, GLfloat, GLfloat) Source
Contains the four default outer tessellation levels to be used when no tessellation control shader is present.
patchDefaultInnerLevel :: StateVar (GLfloat, GLfloat) Source
Contains the two default inner tessellation levels to be used when no tessellation control shader is present.
maxTessGenLevel :: GettableStateVar GLsizei Source
Contains the maximum allowed tessellation level.