Class TglBitmap2D
Unit
glBitmap
Declaration
type TglBitmap2D = class(TglBitmap)
Description
wrapper class for 2-dimensional textures (OpenGL target = GL_TEXTURE_2D)
Hierarchy
Overview
Fields
Methods
Properties
Description
Fields
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fLines: array of PByte; |
array to store scanline entry points in
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Methods
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function GetScanline(const aIndex: Integer): Pointer; |
get a specific scanline
Parameters
- aIndex
- index of the scanline to return
Returns
scanline at position aIndex or Nil |
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procedure SetDataPointer(var aData: PByte; const aFormat: TglBitmapFormat; const aWidth: Integer = - 1; const aHeight: Integer = - 1); override; |
set data pointer of texture data
Parameters
- aData
- pointer to new texture data (be carefull, aData could be freed by this function)
- aFormat
- format of the data stored at aData
- aWidth
- width of the texture data
- aHeight
- height of the texture data
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procedure UploadData(const aTarget: GLenum); |
upload the texture data to video card
Parameters
- aTarget
- target o upload data to (e.g. GL_TEXTURE_2D)
- aBuildWithGlu
- use glu functions to build mipmaps
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procedure AfterConstruction; override; |
this method is called after constructor and initializes the object
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procedure GrabScreen(const aTop, aLeft, aRight, aBottom: Integer; const aFormat: TglBitmapFormat); |
copy a part of the frame buffer top the texture
Parameters
- aTop
- topmost pixel to copy
- aLeft
- leftmost pixel to copy
- aRight
- rightmost pixel to copy
- aBottom
- bottommost pixel to copy
- aFormat
- format to store data in
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procedure GenTexture(const aTestTextureSize: Boolean = true); override; |
generate texture (create texture object if not exist, set texture parameters and upload data)
Parameters
- aTestTextureSize
- check the size of the texture and throw exception if something is wrong
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function FlipHorz: Boolean; override; |
flip texture horizontally
Returns
True on success, False otherwise
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function FlipVert: Boolean; override; |
flip texture vertically
Returns
True on success, False otherwise
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procedure GenerateNormalMap(const aFunc: TglBitmapNormalMapFunc = nm3x3; const aScale: Single = 2; const aUseAlpha: Boolean = false); |
create normal map from texture data
Parameters
- aFunc
- normal map function to generate normalmap with
- aScale
- scale of the normale stored in the normal map
- aUseAlpha
- generate normalmap from alpha channel data (if present)
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Properties
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property Width; |
actual width of the texture
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property Height; |
actual height of the texture
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property Scanline[constaIndex:Integer]: Pointer read GetScanline; |
scanline to access texture data directly
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Generated by PasDoc 0.13.0 on 2014-12-21 15:05:48
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