HOpenGL Libraries (OpenGL package) Source code Contents Index

Graphics.Rendering.OpenGL.GL.PerFragment Portability portable Stability stable Maintainer sven.panne@aedion.de

Contents Scissor Test Multisample Fragment Operations Depth Bounds Test Alpha Test Stencil Test Depth Buffer Test Occlusion Queries Blending Dithering Logical Operation

Description

This module corresponds to section 4.1 (Per-Fragment Operations) of the OpenGL 2.1 specs.

Synopsis

scissor :: StateVar (Maybe (Position, Size)) sampleAlphaToCoverage :: StateVar Capability sampleAlphaToOne :: StateVar Capability sampleCoverage :: StateVar (Maybe (GLclampf, Bool)) depthBounds :: StateVar (Maybe (GLclampd, GLclampd)) data ComparisonFunction = Never | Less | Equal | Lequal | Greater | Notequal | Gequal | Always alphaFunc :: StateVar (Maybe (ComparisonFunction, GLclampf)) stencilTest :: StateVar Capability stencilFunc :: StateVar (ComparisonFunction, GLint, GLuint) stencilFuncSeparate :: Face -> SettableStateVar (ComparisonFunction, GLint, GLuint) data StencilOp = OpZero | OpKeep | OpReplace | OpIncr | OpIncrWrap | OpDecr | OpDecrWrap | OpInvert stencilOp :: StateVar (StencilOp, StencilOp, StencilOp) stencilOpSeparate :: Face -> SettableStateVar (StencilOp, StencilOp, StencilOp) activeStencilFace :: StateVar (Maybe Face) depthFunc :: StateVar (Maybe ComparisonFunction) newtype QueryObject = QueryObject GLuint data QueryTarget = SamplesPassed withQuery :: QueryTarget -> QueryObject -> IO a -> IO a queryCounterBits :: QueryTarget -> GettableStateVar GLsizei currentQuery :: QueryTarget -> GettableStateVar (Maybe QueryObject) queryResult :: QueryObject -> GettableStateVar GLuint queryResultAvailable :: QueryObject -> GettableStateVar Bool blend :: StateVar Capability data BlendEquation = FuncAdd | FuncSubtract | FuncReverseSubtract | Min | Max | LogicOp blendEquation :: StateVar BlendEquation blendEquationSeparate :: StateVar (BlendEquation, BlendEquation) data BlendingFactor = Zero | One | SrcColor | OneMinusSrcColor | DstColor | OneMinusDstColor | SrcAlpha | OneMinusSrcAlpha | DstAlpha | OneMinusDstAlpha | ConstantColor | OneMinusConstantColor | ConstantAlpha | OneMinusConstantAlpha | SrcAlphaSaturate blendFuncSeparate :: StateVar ((BlendingFactor, BlendingFactor), (BlendingFactor, BlendingFactor)) blendFunc :: StateVar (BlendingFactor, BlendingFactor) blendColor :: StateVar (Color4 GLclampf) dither :: StateVar Capability data LogicOp = Clear | And | AndReverse | Copy | AndInverted | Noop | Xor | Or | Nor | Equiv | Invert | OrReverse | CopyInverted | OrInverted | Nand | Set logicOp :: StateVar (Maybe LogicOp)

Scissor Test

scissor :: StateVar (Maybe (Position, Size))

Multisample Fragment Operations

sampleAlphaToCoverage :: StateVar Capability

sampleAlphaToOne :: StateVar Capability

sampleCoverage :: StateVar (Maybe (GLclampf, Bool))

Depth Bounds Test

depthBounds :: StateVar (Maybe (GLclampd, GLclampd))

Alpha Test

data ComparisonFunction

Constructors Never Less Equal Lequal Greater Notequal Gequal Always Instances Eq ComparisonFunction Ord ComparisonFunction Show ComparisonFunction

alphaFunc :: StateVar (Maybe (ComparisonFunction, GLclampf))

Stencil Test

stencilTest :: StateVar Capability

stencilFunc :: StateVar (ComparisonFunction, GLint, GLuint)

stencilFuncSeparate :: Face -> SettableStateVar (ComparisonFunction, GLint, GLuint)

data StencilOp

Constructors OpZero OpKeep OpReplace OpIncr OpIncrWrap OpDecr OpDecrWrap OpInvert Instances Eq StencilOp Ord StencilOp Show StencilOp

stencilOp :: StateVar (StencilOp, StencilOp, StencilOp)

stencilOpSeparate :: Face -> SettableStateVar (StencilOp, StencilOp, StencilOp)

activeStencilFace :: StateVar (Maybe Face)

Depth Buffer Test

depthFunc :: StateVar (Maybe ComparisonFunction)

Occlusion Queries

newtype QueryObject

Constructors QueryObject GLuint Instances Eq QueryObject ObjectName QueryObject Ord QueryObject Show QueryObject

data QueryTarget

Constructors SamplesPassed Instances Eq QueryTarget Ord QueryTarget Show QueryTarget

withQuery :: QueryTarget -> QueryObject -> IO a -> IO a

queryCounterBits :: QueryTarget -> GettableStateVar GLsizei

currentQuery :: QueryTarget -> GettableStateVar (Maybe QueryObject)

queryResult :: QueryObject -> GettableStateVar GLuint

queryResultAvailable :: QueryObject -> GettableStateVar Bool

Blending

blend :: StateVar Capability

data BlendEquation

Constructors FuncAdd FuncSubtract FuncReverseSubtract Min Max LogicOp Instances Eq BlendEquation Ord BlendEquation Show BlendEquation

blendEquation :: StateVar BlendEquation

blendEquationSeparate :: StateVar (BlendEquation, BlendEquation)

data BlendingFactor

Constructors Zero One SrcColor OneMinusSrcColor DstColor OneMinusDstColor SrcAlpha OneMinusSrcAlpha DstAlpha OneMinusDstAlpha ConstantColor OneMinusConstantColor ConstantAlpha OneMinusConstantAlpha SrcAlphaSaturate Instances Eq BlendingFactor Ord BlendingFactor Show BlendingFactor

blendFuncSeparate :: StateVar ((BlendingFactor, BlendingFactor), (BlendingFactor, BlendingFactor))

blendFunc :: StateVar (BlendingFactor, BlendingFactor)

blendColor :: StateVar (Color4 GLclampf)

Dithering

dither :: StateVar Capability

Logical Operation

data LogicOp

Constructors Clear And AndReverse Copy AndInverted Noop Xor Or Nor Equiv Invert OrReverse CopyInverted OrInverted Nand Set Instances Eq LogicOp Ord LogicOp Show LogicOp

logicOp :: StateVar (Maybe LogicOp)

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