HOpenGL Libraries (OpenGL package)ContentsIndex
Graphics.Rendering.OpenGL.GL.VertexSpec
Portabilityportable
Stabilityprovisional
Maintainersven.panne@aedion.de
Contents
Vertex Coordinates
Auxiliary Vertex Attributes
Texture Coordinates
Normal
Fog Coordinate
Color and Secondary Color
Texture Units
Description
This module corresponds to section 2.7 (Vertex Specification) of the OpenGL 1.5 specs.
Synopsis
class Vertex a where
vertex :: a -> IO ()
vertexv :: Ptr a -> IO ()
class VertexComponent a
data Vertex2 a = Vertex2 !a !a
data Vertex3 a = Vertex3 !a !a !a
data Vertex4 a = Vertex4 !a !a !a !a
currentTextureCoords :: StateVar (TexCoord4 GLfloat)
class TexCoord a where
texCoord :: a -> IO ()
texCoordv :: Ptr a -> IO ()
multiTexCoord :: TextureUnit -> a -> IO ()
multiTexCoordv :: TextureUnit -> Ptr a -> IO ()
class TexCoordComponent a
newtype TexCoord1 a = TexCoord1 a
data TexCoord2 a = TexCoord2 !a !a
data TexCoord3 a = TexCoord3 !a !a !a
data TexCoord4 a = TexCoord4 !a !a !a !a
currentNormal :: StateVar (Normal3 GLfloat)
class Normal a where
normal :: a -> IO ()
normalv :: Ptr a -> IO ()
class NormalComponent a
data Normal3 a = Normal3 !a !a !a
currentFogCoord :: StateVar (FogCoord1 GLfloat)
class FogCoord a where
fogCoord :: a -> IO ()
fogCoordv :: Ptr a -> IO ()
class FogCoordComponent a
newtype FogCoord1 a = FogCoord1 a
rgbaMode :: GettableStateVar Bool
currentColor :: StateVar (Color4 GLfloat)
class Color a where
color :: a -> IO ()
colorv :: Ptr a -> IO ()
currentSecondaryColor :: StateVar (Color3 GLfloat)
class SecondaryColor a where
secondaryColor :: a -> IO ()
secondaryColorv :: Ptr a -> IO ()
class ColorComponent a
data Color3 a = Color3 !a !a !a
data Color4 a = Color4 !a !a !a !a
currentIndex :: StateVar (Index1 GLint)
class Index a where
index :: a -> IO ()
indexv :: Ptr a -> IO ()
class IndexComponent a
newtype Index1 a = Index1 a
newtype TextureUnit = TextureUnit GLuint
maxTextureUnit :: GettableStateVar TextureUnit
Vertex Coordinates
class Vertex a where

Specify the (x, y, z, w) coordinates of a four-dimensional vertex. This must only be done during renderPrimitive, otherwise the behaviour is unspecified. The current values of the auxiliary vertex attributes are associated with the vertex.

Note that there is no such thing as a "current vertex" which could be retrieved.

Methods
vertex :: a -> IO ()
vertexv :: Ptr a -> IO ()
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class VertexComponent a
The class of all types which can be used as a vertex coordinate.
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data Vertex2 a
A vertex with z=0 and w=1.
Constructors
Vertex2 !a !a
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data Vertex3 a
A vertex with w=1.
Constructors
Vertex3 !a !a !a
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data Vertex4 a
A fully-fledged four-dimensional vertex.
Constructors
Vertex4 !a !a !a !a
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Auxiliary Vertex Attributes

Apart from its coordinates in four-dimensional space, every vertex has associated auxiliary attributes: Its texture coordinates, a normal, a fog coordinate, and a color plus a secondary color. For every attribute, the OpenGL state contains its current value, which can be changed at any time.

Every attribute has a "natural" format via which it can be manipulated directly as part of the OpenGL state, e.g. the current texture coordinates are internally handled as TexCoord4 GLfloat. Different formats are converted to this format, e.g. the s, r, and t coordinates of a TexCoord3 GLint are converted to floating point values and a q coordinate of 1.0 is implicitly assumed.

Consequently, the vast majority of classes, functions, and data types in this module are for convenience only and offer no additional functionality.

Texture Coordinates
currentTextureCoords :: StateVar (TexCoord4 GLfloat)
The current texture coordinates (s, t, r, q) for the current texture unit (see activeTexture). The initial value is (0,0,0,1) for all texture units.
class TexCoord a where
Change the current texture coordinates of the current or given texture unit.
Methods
texCoord :: a -> IO ()
texCoordv :: Ptr a -> IO ()
multiTexCoord :: TextureUnit -> a -> IO ()
multiTexCoordv :: TextureUnit -> Ptr a -> IO ()
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class TexCoordComponent a
The class of all types which can be used as a texture coordinate.
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newtype TexCoord1 a
Texture coordinates with t=0, r=0, and q=1.
Constructors
TexCoord1 a
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data TexCoord2 a
Texture coordinates with r=0 and q=1.
Constructors
TexCoord2 !a !a
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data TexCoord3 a
Texture coordinates with q=1.
Constructors
TexCoord3 !a !a !a
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data TexCoord4 a
Fully-fledged four-dimensional texture coordinates.
Constructors
TexCoord4 !a !a !a !a
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Normal
currentNormal :: StateVar (Normal3 GLfloat)
The current normal (x, y, z). The initial value is the unit vector (0, 0, 1).
class Normal a where

Change the current normal. Integral arguments are converted to floating-point with a linear mapping that maps the most positive representable integer value to 1.0, and the most negative representable integer value to -1.0.

Normals specified with normal or normalv need not have unit length. If normalize is enabled, then normals of any length specified with normal or normalv are normalized after transformation. If rescaleNormal is enabled, normals are scaled by a scaling factor derived from the modelview matrix. rescaleNormal requires that the originally specified normals were of unit length, and that the modelview matrix contains only uniform scales for proper results. Normalization is initially disabled.

Methods
normal :: a -> IO ()
normalv :: Ptr a -> IO ()
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class NormalComponent a
The class of all types which can be used as a component of a normal.
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data Normal3 a
Constructors
Normal3 !a !a !a
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Fog Coordinate
currentFogCoord :: StateVar (FogCoord1 GLfloat)
The current fog coordinate. The initial value is 0.
class FogCoord a where
Change the current fog coordinate.
Methods
fogCoord :: a -> IO ()
fogCoordv :: Ptr a -> IO ()
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class FogCoordComponent a
The class of all types which can be used as the fog coordinate.
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newtype FogCoord1 a
A fog coordinate.
Constructors
FogCoord1 a
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Color and Secondary Color
rgbaMode :: GettableStateVar Bool
If rgbaMode contains True, the color buffers store RGBA value. If color indexes are stored, it contains False.
currentColor :: StateVar (Color4 GLfloat)
class Color a where
Change the current color.
Methods
color :: a -> IO ()
colorv :: Ptr a -> IO ()
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currentSecondaryColor :: StateVar (Color3 GLfloat)
class SecondaryColor a where
Change the current secondary color.
Methods
secondaryColor :: a -> IO ()
secondaryColorv :: Ptr a -> IO ()
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class ColorComponent a
The class of all types which can be used as a color component.
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data Color3 a
Constructors
Color3 !a !a !a
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data Color4 a
A fully-fledged RGBA color.
Constructors
Color4 !a !a !a !a
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currentIndex :: StateVar (Index1 GLint)
class Index a where
Change the current color index.
Methods
index :: a -> IO ()
indexv :: Ptr a -> IO ()
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class IndexComponent a
The class of all types which can be used as a color index.
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newtype Index1 a
A color index.
Constructors
Index1 a
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Texture Units
newtype TextureUnit
Identifies a texture unit via its number, which must be in the range of (0 .. maxTextureUnit).
Constructors
TextureUnit GLuint
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maxTextureUnit :: GettableStateVar TextureUnit
An implementation must support at least 2 texture units, but it may support up to 32 ones. This state variable can be used to query the actual implementation limit.
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