wx.glcanvas.GLAttributes

This class is used for setting display attributes when drawing through OpenGL (“Pixel format” in MSW and OSX parlance, “Configs” in X11).

While framebuffer depth and samplers are still common, attributes like layers overlay or not using True colour are rarely used nowadays.

Attributes can be chained. For example:

dispAttrs = wx.glcanvas.GLAttributes()
dispAttrs.PlatformDefaults().MinRGBA(8, 8, 8, 8).DoubleBuffer().Depth(32).EndList()

Notice that EndList must be used as the last attribute. Not adding it will likely result in nothing displayed at all.

New in version 4.1/wxWidgets-3.1.0.

Note

Not all of platform-dependant available attributes are implemented in wxWidgets. You can set other attributes by using AddAttribute and AddAttribBits functions inherited from the base wx.glcanvas.GLAttribsBase class. While WGL_/GLX_/NS attributes can be added, PFD_ (for MSW) can not.

See also

wx.glcanvas.GLCanvas, wx.glcanvas.GLContext, wx.glcanvas.GLAttribsBase, wx.glcanvas.GLContextAttrs

Class Hierarchy

Inheritance diagram for class GLAttributes:

Methods Summary

AuxBuffers	Specifies the number of auxiliary buffers.
BufferSize	Specifies the number of bits for colour buffer.
Defaults	wxWidgets defaults: RGBA, Z-depth 16 bits, double buffering, 1 sample buffer, 4 samplers.
Depth	Specifies number of bits for Z-buffer.
DoubleBuffer	Requests using double buffering.
EndList	The set of attributes must end with this one; otherwise, the GPU may display nothing at all.
FrameBuffersRGB	Used to request a frame buffer sRGB capable.
Level	Specifies the framebuffer level.
MinAcumRGBA	Specifies the minimal number of bits for each accumulator channel.
MinRGBA	Specifies the minimal number of bits for each colour and alpha.
PlatformDefaults	Set some typically needed attributes.
RGBA	Use True colour instead of colour index rendering for each pixel.
SampleBuffers	Use multi-sampling support (antialiasing).
Samplers	Specifies the number of samplers per pixel.
Stencil	Specifies number of bits for stencil buffer.
Stereo	Use stereoscopic display.

Class API

class wx.glcanvas.GLAttributes(GLAttribsBase)

This class is used for setting display attributes when drawing through OpenGL (“Pixel format” in MSW and OSX parlance, “Configs” in X11).

Methods

AuxBuffers(self, val)

Specifies the number of auxiliary buffers.

Parameters:

val (int) – The number of auxiliary buffers.

Return type:

wx.glcanvas.GLAttributes

---

BufferSize(self, val)

Specifies the number of bits for colour buffer.

For RGBA it’s normally the sum of the bits per each component.

Parameters:

val (int) – The number of bits.

Return type:

wx.glcanvas.GLAttributes

---

Defaults(self)

wxWidgets defaults: RGBA, Z-depth 16 bits, double buffering, 1 sample buffer, 4 samplers.

Return type:

wx.glcanvas.GLAttributes

See also

PlatformDefaults

---

Depth(self, val)

Specifies number of bits for Z-buffer.

Parameters:

val (int) – Number of bits for Z-buffer (typically 0, 16 or 32).

Return type:

wx.glcanvas.GLAttributes

---

DoubleBuffer(self)

Requests using double buffering.

Return type:

wx.glcanvas.GLAttributes

---

EndList(self)

The set of attributes must end with this one; otherwise, the GPU may display nothing at all.

---

FrameBuffersRGB(self)

Used to request a frame buffer sRGB capable.

It makes no effect for macOS.

Return type:

wx.glcanvas.GLAttributes

---

Level(self, val)

Specifies the framebuffer level.

It makes no effect for macOS.

Parameters:

val (int) – 0 for main buffer, >0 for overlay, <0 for underlay.

Return type:

wx.glcanvas.GLAttributes

---

MinAcumRGBA(self, mRed, mGreen, mBlue, mAlpha)

Specifies the minimal number of bits for each accumulator channel.

On MSW and OSX this function also sets the size of the accumulation buffer.

Parameters:

• mRed (int) – The minimal number of bits for red accumulator.

• mGreen (int) – The minimal number of bits for green accumulator.

• mBlue (int) – The minimal number of bits for blue accumulator.

• mAlpha (int) – The minimal number of bits for alpha accumulator.

Return type:

wx.glcanvas.GLAttributes

---

MinRGBA(self, mRed, mGreen, mBlue, mAlpha)

Specifies the minimal number of bits for each colour and alpha.

On MSW and OSX this function also sets the size of the colour buffer.

Parameters:

• mRed (int) – The minimal number of bits for colour red.

• mGreen (int) – The minimal number of bits for colour green.

• mBlue (int) – The minimal number of bits for colour blue.

• mAlpha (int) – The minimal number of bits for alpha channel.

Return type:

wx.glcanvas.GLAttributes

---

PlatformDefaults(self)

Set some typically needed attributes.

E.g. full-acceleration on MSW.

Return type:

wx.glcanvas.GLAttributes

See also

Defaults

---

RGBA(self)

Use True colour instead of colour index rendering for each pixel.

It makes no effect for macOS.

Return type:

wx.glcanvas.GLAttributes

---

SampleBuffers(self, val)

Use multi-sampling support (antialiasing).

Parameters:

val (int) – Number of sample buffers, usually 1.

Return type:

wx.glcanvas.GLAttributes

---

Samplers(self, val)

Specifies the number of samplers per pixel.

Parameters:

val (int) – Number of samplers, e.g. 4 for 2x2 antialiasing.

Return type:

wx.glcanvas.GLAttributes

---

Stencil(self, val)

Specifies number of bits for stencil buffer.

Parameters:

val (int) – Number of bits.

Return type:

wx.glcanvas.GLAttributes

---

Stereo(self)

Use stereoscopic display.

Return type:

wx.glcanvas.GLAttributes