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Image cheetah.newImage( string filename, string options = '' )
Create new Image from file. Reads file from disk by path specified in filename. If You may pass some options to this function. Image loader supports these image formats:
- PNG (24-bit or 32-bit only, indexed colors are not supported) - slow and pretty
- Jpeg (only non-progressive!) - good for photos but may produce artifacts
- BMP - slow and disk space hungry
- DDS (DXT1 or DXT3) - fastest loading and rendering on most desktop GPUs
Parameters
- path to file
- string of options. This is depends on image loading module you use. Supported options:
- nearest - use nearest interpolation instead of default linear interpolation
- mipmap - generate mip-maps (automatically sets mip-map interpolation)
- instant - load instantly without delayed resource loader
- clamp - force texture clamp (default is repeat)
See also: cheetah.generate, cheetah.newBorderImage
Image cheetah.generate( string type, number width, number height, string options = '' )
Procedural generation of Image. Engine generates procedural texture specified in type and loads it as Image object. Fast and simple way to create simple demosntrations and effects withount using even external files.
Parameters
- type of procedural contet. Following types are supported:
- dummy - just white rectangle
- noise - random pixels - often used as noise pattern for shaders
- light - create light
- lightexp - create smooth gaussian light
- circle - generates ugly aliased circle
- width of Image
- height of generated Image
- string of generator's options. Supported options:
- alpha - generate 32-bit image with alpha channel instead of making 24-bit RGB image
- nearest - use nearest interpolation instead of linear interpolation which is by default
- clamp - enable texture clamp (default is repeat)
See also: cheetah.newImage, cheetah.newBorderImage
Image:draw( number x = 0, number y = 0, number width = Image:getWidth(), number height = Image:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw Image on screen with transformations.
Parameters
- x position
- y position
- width of object
- height of object
- angle (radians)
- origin x
- origin y
Image:drawq( number x = 0, number y = 0, number width = Image:getWidth(), number height = Image:getHeight(), quad_x = 0, quad_y = 0, quad_wigth = Image:getWidth(), quad_height = Image:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw part of Image on screen with transformations. Quads are useful for drawing or only part of image or drawing repeating patterns. Image will be clamped according to quad metrics and then it works as Image:draw() method.
Parameters
- x position
- y position
- quad x position
- quad y position
- quad width
- quad height
- angle (radians)
- origin x
- origin y
number Image:getWidth()
Get width of Image.
number Image:getHeight()
Get height of Image.
Atlas:draw( number x = 0, number y = 0, number width = Atlas:getWidth(), number height = Atlas:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw Atlas on screen with transformations.
Parameters
- x position
- y position
- width of object
- height of object
- angle (radians)
- origin x
- origin y
number Atlas:getWidth()
Get width of Atlas.
cheetah.newFont( string filename, bool scalable = true )
Create new Font, this function reads font file generated by UBFG (Ultimate Bitmap Font Generator). Font files of UBFG have .fnt extension. One .fnt file may contains several fonts (different sizes, garnitures), all fonts objects placed into cheetah.fonts[NAME][SIZE].
Parameters
- font file name
- is font scalable (if true, uses linear interpolation, nearest otherwise)
Font Font:getHeight()
Get height of Font in pixels, takes into account screen scale. Usually this is full height of font.
number Font:getScale()
Get scale of Font.
See also: cheetah.setScale
Font:setScale(number scale)
Set scale of Font in pixels.
Parameters
- scale of the Font
See also: cheetah.getScale
Font:setInterval(number interval)
Set interval of Font in pixels (interval between lines). Default interval is 0 (standart interval between lines), you may increase or decrease it by using positive or negative values of interval.
Parameters
- interval
See also: cheetah.getInterval
number Font:getInterval()
Get interval of Font in pixels (interval between lines).
See also: cheetah.setInterval
Font:print( string text = 'undefined', number x = 0, number y = 0, number width = 0, Align align = cheetah.alignLeft )
Print text using Font with alignment. This function akes into account scaling factor, if font scalable x and y coordinates are floating-point, otherwise x and y are decimal to fit screen pixel grid.
Parameters
- text string, if string is bigger than width - word-wrapping will be enabled
- x coordinate
- y coordinate
- width of text, 0 means infinite width
- alignment of text, possible values are: cheeath.alignLeft cheeath.alignRight cheeath.alignCenter cheeath.alignJustify
Shader cheetah.newShader( string fragment, string vertex = '' )
Create new Shader. Shader is used to produce beatiful pixel effects: lighting, bump-mapping, texture generation and so on. Cheetah 2D Engine supports GLSL shaders. Usually shaders are consist from two shader programs: vertex shader and fragment (pixel) shader. Vertex shader usually sets to default, but fragment shader must be specified any way. Default vertex shader in Cheetah 2D Engine:
varying vec2 TexCoord;
void main()
{
gl_Position = gl_ModelViewProjectionMatrixgl_Vertex;
TexCoord = gl_MultiTexCoord0.xy;
}Parameters
- fragment shader: source code or file with source
- vertex shader: source code or file with source
bool Shader:check()
Check if Shader was created without errors.
Shader:bind()
Bind Shader. After binding all drawings will use this Shader.
See also: cheetah.unbind
Shader:unbind()
Unbind Shader.
See also: cheetah.bind
Shader:set(string uniform, ...)
Set Shader uniform variable. Any Shader may conains variables passed from script. You must set all shader usiforms after calling Shader:bind(). Supported uniforms:
- float
- vec2
- vec3
- vec4
- sampler2D
Parameters
- uniform name
- values
Framebuffer cheetah.newFramebuffer( number width, number height, string options = '' )
Create new Framebuffer. Framebuffer is used as off-screen render target: when you call Framebuffer:bind all drawing will be in this Framebuffer. Then you may draw this Framebuffer as Image. Default framebuffer has 8 bits per channel percision and you can change it, but be carefull: high percision framebuffers are very slow.
Parameters
- width
- height
- string of options. Supported options:
- nearest - use nearest interpolation instead of default linear interpolation
- clamp - force texture clamp (default is repeat)
- alpha - use alpha channel, RGBA (defaul is RGB)
- percision16 - set percision to half float (16 bits per channel)
- percision32 - set percision to float (32 bits per channel)
Framebuffer:draw( number x = 0, number y = 0, number width = Framebuffer:getWidth(), number height = Framebuffer:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw Framebuffer on screen with transformations.
Parameters
- x position
- y position
- width of object
- height of object
- angle (radians)
- origin x
- origin y
Framebuffer:drawq( number x = 0, number y = 0, number width = Framebuffer:getWidth(), number height = Framebuffer:getHeight(), quad_x = 0, quad_y = 0, quad_wigth = Framebuffer:getWidth(), quad_height = Framebuffer:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw part of Framebuffer on screen with transformations. Quads are useful for drawing or only part of image or drawing repeating patterns. Framebuffer will be clamped according to quad metrics and then it works as Framebuffer:draw() method.
Parameters
- x position
- y position
- quad x position
- quad y position
- quad width
- quad height
- angle (radians)
- origin x
- origin y
number Framebuffer:getWidth()
Get width of Framebuffer.
number Framebuffer:getHeight()
Get height of Framebuffer.
Framebuffer:bind()
Bind Framebuffer to store all drawings into it.
Framebuffer:unbind()
Unbind Framebuffer (sets screen as default render target).
Framebuffer:save(string filename)
Save Framebuffer as image (only BMP format supported).
Parameters
- file name where image must be saved
bool Framebuffer:check()
Check if Framebuffer was created without errors.
Multitexture cheetah.newMultitexture(Image ...)
Create new Multitexture from several Image classes. Multitexturing - a technique often used with shaders to combine up to 8 images in one shader (see Shader).
Parameters
- set of Image. You must pass at least 2 arguments.
Multitexture:draw( number x = 0, number y = 0, number width = Multitexture:getWidth(), number height = Multitexture:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw Multitexture on screen with transformations.
Parameters
- x position
- y position
- width of object
- height of object
- angle (radians)
- origin x
- origin y
Multitexture:drawq( number x = 0, number y = 0, number width = Multitexture:getWidth(), number height = Multitexture:getHeight(), quad_x = 0, quad_y = 0, quad_wigth = Multitexture:getWidth(), quad_height = Multitexture:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw part of Multitexture on screen with transformations. Quads are useful for drawing or only part of image or drawing repeating patterns. Multitexture will be clamped according to quad metrics and then it works as Multitexture:draw() method.
Parameters
- x position
- y position
- quad x position
- quad y position
- quad width
- quad height
- angle (radians)
- origin x
- origin y
number Multitexture:getWidth()
Get width of Multitexture.
number Multitexture:getHeight()
Get height of Multitexture.
BorderImage cheetah.newBorderImage( string filename, number top, number right, number bottom, number left, string options )
Create new BorderImage from file. This class is based on Image and used for displaying sliced images. Image will be splitted into 9 different parts. Useful used for GUI elements.
Parameters
- path to file
- top slice position
- right slice position
- bottom slice position
- left slice position
- string of options. Same as Image.
See also: cheetah.generate, cheetah.newImage
BorderImage:draw( number x = 0, number y = 0, number width = BorderImage:getWidth(), number height = BorderImage:getHeight(), number angle = 0, number origin_x = 0, number origin_y = 0 )
Draw BorderImage on screen with transformations.
Parameters
- x position
- y position
- width of object
- height of object
- angle (radians)
- origin x
- origin y
number BorderImage:getWidth()
Get width of BorderImage.
number BorderImage:getHeight()
Get height of BorderImage.
number cheetah.getTime()
Gets the time in seconds past from the execution time. Returns "pure" system time (without game speed).
See also: cheetah.getGameTime, cheetah.getTicks
number cheetah.getGameTime()
Gets the time in seconds past from the execution time. This function returns the time in view of game speed! You may change speed of game using cheetah.setGameSpeed. For example, you may stop this time, increase or decrease its speed and this timer will make possible such effects as slow motion, game pause.
See also: cheetah.getTime, cheetah.getTicks
number cheetah.getTicks()
Gets the number of milliseconds past from the execution time. Returns "pure" system time (without game speed). Also this function does not use timer's cache as previous if you want to measure time more accurately. Equivalent to SDL_GetTicks() on PC.
See also: cheetah.getGameTime, cheetah.getTime
cheetah.delay(number ms)
Do nothing some time.
Parameters
- delay in milliseconds (1/1000 s)
See also: cheetah.sleep
void cheetah.sleep(number sec)
Do nothing some time.
Parameters
- delay in seconds
See also: cheetah.delay
string cheetah.getFile(string filename)
Read entire file into string.
Parameters
- path to file
See also: cheetah.putFile, cheetah.fileExists, cheetah.appendFile
bool cheetah.putFile( string filename, string content, string writemode )
Put sting into file.
Parameters
- path to file
- content to write
- write mode (as in c), use one of: w - replace file if exists wa - append string to file if exists
See also: cheetah.appendFile, cheetah.getFile
bool cheetah.fileExists(string filename)
Check if file exists.
Parameters
- path to file
bool cheetah.appendFile( string filename, string content )
Append string to end of file.
Parameters
- path to file
- content to write
See also: cheetah.putFile, cheetah.getFile
string cheetah.fileExt(string filename)
Get file extension. This functions just returns text from last dot.
Parameters
- file name or path (may be unexistent file)
string cheetah.fileName(string filename)
Get file name (without extension). Returns just all text before last dot.
Parameters
- file name or path (may be unexistent file)
cheetah.fileEach( string dirname, cheetah.callback )
Runs function passed as second argument for each file in directory. Callback function has one orgument: file path.
Parameters
- path to directory you want to scan
- callback function
string cheetah.getAppDataDir()
Get full path to directory where you may save any data.
number cheetah.fileatime(string filename)
Get file access time.
Parameters
- path to file
number cheetah.filemtime(string filename)
Get file modification time.
Parameters
- path to file
number cheetah.filectime(string filename)
Get file creation time.
Parameters
- path to file
bool cheetah.mkDir(string dirname)
Create new directory.
Parameters
- path to directory
DIR cheetah.openDir(string dirname)
Open directory for reading. Note that returned value may not be compared with nil!
Parameters
- path to directory
See also: cheetah.readDir, cheetah.closeDir, cheetah.isDir
dirent cheetah.readDir(DIR dirptr)
Read files from dir. Use cheetah.getDirentName to get dir name and cheetah.isPointer to check if there is more files in this dir.
Parameters
- Pointer from cheetah.openDir
See also: cheetah.openDir, cheetah.closeDir, cheetah.isDir, cheetah.getDirentName
number cheetah.closeDir(DIR dirptr)
Close opened directory and free memory.
Parameters
- Pointer from cheetah.openDir
See also: cheetah.openDir, cheetah.readDir, cheetah.isDir
string cheetah.getDirentName(dirent dir)
Get a name of dir from dirent structure.
Parameters
- Dirent from cheetah.readdir
See also: cheetah.openDir, cheetah.readDir, cheetah.isDir
bool cheetah.isDir(string path)
Check is this path a directory.
Parameters
- Path to file you want to check
See also: cheetah.openDir, cheetah.readDir, cheetah.isDir
bool cheetah.init(string appName, string options)
Create window and initialize all OpenGL's stuff. You MUST call this before any graphics function, e.g. cheetah.newImage. You may call this function again to re-size window, change application title, toggle fullscreen. Other options are ignored.
Parameters
- application's title shown in titlebar
- string of options. Supported options:
- 1024x768 - set window size to 1024x768, default window size - 800x600
- 1024 - set window size to 1024x1024
- fullscreen - run in fullscreen mode
- resizable - make window resizable
- vsync - enable vertical synchronization
- resloader - enable delayed resource loader (all images are loaded in separate thread), possible only with internal image loader, external modules (as DevIL) are not supported
- depth - enable depth buffer
- stencil - enable stencil buffer
- noframe - try to make window without frame (depending on window manager, fullscreen mode, OS may not work)
bool cheetah.isInit()
Check, if screen exists. Useful if you have windowless version of your application, e.g. server.
cheetah.mainLoop()
Starts main loop. You must always place this function at the end of all scripts to start application.
cheetah.quit()
Close application.
number cheetah.getWindowWidth()
Get window width.
number cheetah.getWindowHeight()
Get window height.
cheetah.swapBuffers()
Get window dimensions. Swap buffers and present graphics. This function calls automatically every frame by default.
cheetah.setTitle(string text)
Set window's title.
Parameters
- text to replace the caption
See also: cheetah.init
cheetah.getModes(string text)
Get all avaiable screen modes (screen resolution list). This is useful if you want to use fullscreen mode.
Parameters
- text to replace the caption
See also: cheetah.init
cheetah.setResizeDelay(number delay)
Set interval to check window resizing. Too small interval means window to be blinking, too big interval - window resizing will be laggy
Parameters
- delay in milliseconds
number cheetah.getMouseX()
Get mouse position. Get mouse x position.
number cheetah.getMouseY()
Get mouse y position.
bool cheetah.isKeyPressed(string key)
Checks if key is pressed. Useful for objects movement.
Parameters
- key (e.g. "a", "space", "enter")
cheetah.gameSpeed(number speed)
Set game speed (main timer will be slower or faster).
Parameters
- speed (e.g. 1 - normal speed, 2 - 2x faster, 0.5 - 2x slower)
number cheetah.getEventType()
Pick an event from events queue and return its type.
number cheetah.getEventKey()
Get numberic keyboard key from current event state.
number cheetah.getEventKeyUnicode()
Get unicode keyboard key from current event state. Useful for text input and layouts support.
number cheetah.getEventMouseX()
Get mouse position from current event state.
number cheetah.getEventMouseY()
Get mouse position from current event state.
number cheetah.getEventMouseButton()
Get mouse button from current event state. Mouse button may be pressed or released depending on event type.
number cheetah.getEventResizeW()
Get window size from current resize event state.
number cheetah.getEventResizeH()
Get window size from current resize event state.
SDLState cheetah.getKeyState()
Get current keyboard state.
number cheetah.getFps()
Get FPS (frames per second).
cheetah.flushBuffer()
Draw all quads accumulated in engine's quad buffer (flush vertex accumulator). Cheetah 2D engine uses its own buffer to batch drawing of huge amount of quads with one shared texture. Usually engine flushes this buffer automatically.
cheetah.enableDepthTest()
Enables depth test. Useless if you didn't pass 'depth' option to cheetah.init. Equivalent to glEnable(GL_DEPTH_TEST);
See also: cheetah.disableDepthTest
cheetah.disableDepthTest()
Disables depth test. Useless if you didn't pass 'depth' option to cheetah.init. Equivalent to glDisable(GL_DEPTH_TEST);
See also: cheetah.enableDepthTest
cheetah.enableStencilTest()
Enables stencil test. Useless if you didn't pass 'stencil' option to cheetah.init. Equivalent to glEnable(GL_STENCIL_TEST);
See also: cheetah.disableStencilTest
cheetah.disableStencilTest()
Disables stencil test. Useless if you didn't pass 'stencil' option to cheetah.init. Equivalent to glDisable(GL_STENCIL_TEST);
See also: cheetah.enableStencilTest
cheetah.enableScissorTest()
Enables scissor test. Equivalent to glEnable(GL_SCISSOR_TEST);
See also: cheetah.disableStencilTest
cheetah.disableScissorTest()
Disables scissor test. Equivalent to glDisable(GL_SCISSOR_TEST);
See also: cheetah.enableStencilTest
cheetah.enableAlphaTest()
Enables alpha test. Equivalent to glEnable(GL_ALPHA_TEST);
See also: cheetah.disableAlphaTest
cheetah.disableAlphaTest()
Disables alpha test. Equivalent to glDisable(GL_ALPHA_TEST);
See also: cheetah.enableAlphaTest
cheetah.setScissor( number x, number y, number w, number h )
Set scissor area.
See also: cheetah.enableScissorTest
cheetah.flush()
Flush graphics. Forces OpenGL to complete all draw calls.
cheetah.blend(bool blendMode)
Enable or disable blending. Drawing without blending usually faster, but textures with alpha-channel will loose its opacity. Blending is enabled by default.
Parameters
- blend mode
See also: cheetah.enableBlend, cheetah.disableBlend, cheetah.blendMode
cheetah.enableBlend()
Enable blending. Blending is enabled by default.
See also: cheetah.disableBlend, cheetah.blend, cheetah.blendMode
cheetah.disableBlend()
Disable blending.
See also: cheetah.enableBlend, cheetah.blend, cheetah.blendMode
cheetah.push()
Push the transformation matrix to stack. Equivalent to glPushMatrix();
See also: cheetah.pop, cheetah.reset
cheetah.pop()
Pop the transformation matrix from stack. Equivalent to glPopMatrix();
See also: cheetah.push, cheetah.reset
cheetah.reset()
Reset the transformation matrix. Equivalent to glLoadIdentity();
See also: cheetah.push, cheetah.pop
cheetah.move( number translateX, number translateY )
Move object relatively to the current matrix position (in pixels). This function must be called between cheetah.push and cheetah.pop functions.
Parameters
- x coordinate
- y coordinate
See also: cheetah.scale, cheetah.rotate, cheetah.translateObject
cheetah.scale(number scaleX, number scaleY)
Scale object relatively to the current matrix size (initially, matrix has size 1:1 to fit pixel grid). This function must be called between cheetah.push and cheetah.pop functions.
Parameters
- x scale
- y scale
See also: cheetah.move, cheetah.rotate, cheetah.translateObject
cheetah.rotate(number angle)
Rotate object relatively to the current matrix angle. This function must be called between cheetah.push and cheetah.pop functions.
Parameters
- angle
See also: cheetah.move, cheetah.scale, cheetah.translateObject
cheetah.translateObject( number x, number y, number angle, number width, number height, number origin_x, number origin_y )
Move, rotate and scale object relatively to it's center (origin). This function must be called between cheetah.push and cheetah.pop functions.
Parameters
- x coordinate
- y coordinate
- angle
- x scale
- y scale
- x offset (center)
- y offset (center)
See also: cheetah.move, cheetah.scale, cheetah.rotate
cheetah.autoScale(bool autoScale)
Enable or disable autoscale. Autoscale allows you to draw stuff in the fixed coordinates, and engine automatically translates all coordinates if window changes his size. Is you want to control screen size yourself, disable this.
Parameters
- enable or disable autoscale
cheetah.color( number red, number green, number blue, number alpha )
Set the color. All graphics below will be painted with this color.
Parameters
- red component (0-255)
- green component (0-255)
- blue component (0-255)
- alpha component, opacity (0-255)
See also: cheetah.colorf, cheetah.clearColor
cheetah.colorf( number red, number green, number blue, number alpha )
Set the color in floating-point mode. All graphics below will be painted with this color.
Parameters
- red component (0-1)
- green component (0-1)
- blue component (0-1)
- alpha component, opacity (0-1)
See also: cheetah.color, cheetah.clearColor
cheetah.clearColor( number red, number green, number blue, number alpha )
Set the color used to clear screen (default background color).
Parameters
- red component (0-1)
- green component (0-1)
- blue component (0-1)
- alpha component, opacity (0-1)
See also: cheetah.color, cheetah.colorf
cheetah.blendMode(enumerate mode)
Sets the blending mode. Blending modes allow you to create some cool effects.
Parameters
- One of possible blending modes. Use pre-defined blending modes:
- cheetah.blendAlpha - default
- cheetah.blendMultiplicative
- cheetah.blendAdditive
- cheetah.blendSubstractive
- cheetah.blendMask - render inverse alpha channel
- cheetah.blendScreen - as PhotoShop's Screen mode
- cheetah.blendDetail - interesting effect, allows to use gray detail textures. Gray color does not change lighness, white color increases lightness, black color makes dark places. This mode may be used to produce lighting effects without shaders.
See also: cheetah.blend, cheetah.enableBlend, cheetah.disableBlend
cheetah.blendFunc( enumerate sourcefactor, enumerate destinationfactor )
Specify pixel arithmetic. Equivalent to glBlendFunc(sourcefactor, destinationfactor);
Parameters
- Specifies how the red, green, blue, and alpha source blending factors are computed. The following symbolic constants are accepted:
- cheetah.GL_ZERO
- cheetah.GL_ONE
- cheetah.GL_DST_COLOR
- cheetah.GL_ONE_MINUS_DST_COLOR
- cheetah.GL_SRC_ALPHA
- cheetah.GL_ONE_MINUS_SRC_ALPHA
- cheetah.GL_DST_ALPHA
- cheetah.GL_ONE_MINUS_DST_ALPHA
- cheetah.GL_SRC_ALPHA_SATURATE
- Specifies how the red, green, blue, and alpha destination blending factors are computed. Eight symbolic constants are accepted:
- cheetah.GL_ZERO
- cheetah.GL_ONE
- cheetah.GL_SRC_COLOR
- cheetah.GL_ONE_MINUS_SRC_COLOR
- cheetah.GL_SRC_ALPHA
- cheetah.GL_ONE_MINUS_SRC_ALPHA
- cheetah.GL_DST_ALPHA
- cheetah.GL_ONE_MINUS_DST_ALPHA
cheetah.clear()
Clear screen. Do not use it if you have background image. Cheetah 2D engine clears screen automatically, but you may use this to clear framebuffer.
See also: cheetah.clearColor, cheetah.clearColorDepth, cheetah.clearColorStencil, cheetah.clearDepth, cheetah.clearStencil
cheetah.clearColorDepth()
Clear screen and depth buffer. Usually used in lQuery.addhook(cheetah.clearColorDepth). Slow.
See also: cheetah.clearColor, cheetah.clear, cheetah.clearColorStencil, cheetah.clearDepth, cheetah.clearStencil
cheetah.clearColorStencil()
Clear screen and stencil buffer. Usually used in lQuery.addhook(cheetah.clearColorStencil). Slow.
See also: cheetah.clearColor, cheetah.clear, cheetah.clearColorDepth, cheetah.clearDepth, cheetah.clearStencil
cheetah.clearDepth()
Clear depth buffer. Usually used in lQuery.addhook(cheetah.clearDepth). Slow.
See also: cheetah.clearColor, cheetah.clear, cheetah.clearColorDepth, cheetah.clearColorStencil, cheetah.clearStencil
cheetah.clearStencil()
Clear stencil buffer. Usually used in lQuery.addhook(cheetah.clearStencil). Slow.
See also: cheetah.clearColor, cheetah.clear, cheetah.clearColorDepth, cheetah.clearColorStencil, cheetah.clearDepth
cheetah.blendEquation(enumerate mode)
Specify the equation used for both the RGB blend equation and the Alpha blend equation. Equivalent to glBlendEquation(mode);
Parameters
- Specifies how source and destination colors are combined. It must be:
- cheetah.GL_FUNC_ADD
- cheetah.GL_FUNC_SUBTRACT
- cheetah.GL_FUNC_REVERSE_SUBTRACT
- cheetah.GL_MIN
- cheetah.GL_MAX
bool cheetah.isPointer(void *pointer)
Check is current lua's ffi object a non-NULL pointer. Needed to check ffi C structures.
Parameters
- Pointer to check