_eve — low-level BridgeTek EVE bindings

The _eve module provides a class _EVE which contains methods for constructing EVE command buffers and appending basic graphics commands.

_eve.flush()

Send any queued drawing commands directly to the hardware.

Parameters:width (int) – The width of the grid in tiles, or 1 for sprites.
_eve.cc(b)

Append bytes to the command FIFO.

Parameters:b (bytes) – The bytes to add
_eve.AlphaFunc(func, ref)

Set the alpha test function

Parameters:
  • func (int) – specifies the test function, one of NEVER, LESS, LEQUAL, GREATER, GEQUAL, EQUAL, NOTEQUAL, or ALWAYS. Range 0-7. The initial value is ALWAYS(7)
  • ref (int) – specifies the reference value for the alpha test. Range 0-255. The initial value is 0

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.Begin(prim)

Begin drawing a graphics primitive

Parameters:prim (int) – graphics primitive.

Valid primitives are BITMAPS, POINTS, LINES, LINE_STRIP, EDGE_STRIP_R, EDGE_STRIP_L, EDGE_STRIP_A, EDGE_STRIP_B and RECTS.

_eve.BitmapExtFormat(format)

Set the bitmap format

Parameters:format (int) – bitmap pixel format.
_eve.BitmapHandle(handle)

Set the bitmap handle

Parameters:handle (int) – bitmap handle. Range 0-31. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.BitmapLayoutH(linestride, height)

Set the source bitmap memory format and layout for the current handle. high bits for large bitmaps

Parameters:
  • linestride (int) – high part of bitmap line stride, in bytes. Range 0-7
  • height (int) – high part of bitmap height, in lines. Range 0-3
_eve.BitmapLayout(format, linestride, height)

Set the source bitmap memory format and layout for the current handle

Parameters:
  • format (int) – bitmap pixel format, or GLFORMAT to use BITMAP_EXT_FORMAT instead. Range 0-31
  • linestride (int) – bitmap line stride, in bytes. Range 0-1023
  • height (int) – bitmap height, in lines. Range 0-511
_eve.BitmapSizeH(width, height)

Set the screen drawing of bitmaps for the current handle. high bits for large bitmaps

Parameters:
  • width (int) – high part of drawn bitmap width, in pixels. Range 0-3
  • height (int) – high part of drawn bitmap height, in pixels. Range 0-3
_eve.BitmapSize(filter, wrapx, wrapy, width, height)

Set the screen drawing of bitmaps for the current handle

Parameters:
  • filter (int) – bitmap filtering mode, one of NEAREST or BILINEAR. Range 0-1
  • wrapx (int) – bitmap \(x\) wrap mode, one of REPEAT or BORDER. Range 0-1
  • wrapy (int) – bitmap \(y\) wrap mode, one of REPEAT or BORDER. Range 0-1
  • width (int) – drawn bitmap width, in pixels. Range 0-511
  • height (int) – drawn bitmap height, in pixels. Range 0-511
_eve.BitmapSource(addr)

Set the source address for bitmap graphics

Parameters:addr (int) – Bitmap start address, pixel-aligned. May be in SRAM or flash. Range 0-16777215
_eve.BitmapSwizzle(r, g, b, a)

Set the source for the r,g,b and a channels of a bitmap

Parameters:
  • r (int) – red component source channel. Range 0-7
  • g (int) – green component source channel. Range 0-7
  • b (int) – blue component source channel. Range 0-7
  • a (int) – alpha component source channel. Range 0-7
_eve.BitmapTransformA(p, v)

Set the \(a\) component of the bitmap transform matrix

Parameters:
  • p (int) – precision control: 0 is 8.8, 1 is 1.15. Range 0-1. The initial value is 0
  • v (int) – The \(a\) component of the bitmap transform matrix, in signed 8.8 or 1.15 bit fixed-point form. Range 0-131071. The initial value is 256

The initial value is p = 0, v = 256. This represents the value 1.0.

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.BitmapTransformB(p, v)

Set the \(b\) component of the bitmap transform matrix

Parameters:
  • p (int) – precision control: 0 is 8.8, 1 is 1.15. Range 0-1. The initial value is 0
  • v (int) – The \(b\) component of the bitmap transform matrix, in signed 8.8 or 1.15 bit fixed-point form. Range 0-131071. The initial value is 0

The initial value is p = 0, v = 0. This represents the value 0.0.

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.BitmapTransformC(v)

Set the \(c\) component of the bitmap transform matrix

Parameters:v (int) – The \(c\) component of the bitmap transform matrix, in signed 15.8 bit fixed-point form. Range 0-16777215. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.BitmapTransformD(p, v)

Set the \(d\) component of the bitmap transform matrix

Parameters:
  • p (int) – precision control: 0 is 8.8, 1 is 1.15. Range 0-1. The initial value is 0
  • v (int) – The \(d\) component of the bitmap transform matrix, in signed 8.8 or 1.15 bit fixed-point form. Range 0-131071. The initial value is 0

The initial value is p = 0, v = 0. This represents the value 0.0.

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.BitmapTransformE(p, v)

Set the \(e\) component of the bitmap transform matrix

Parameters:
  • p (int) – precision control: 0 is 8.8, 1 is 1.15. Range 0-1. The initial value is 0
  • v (int) – The \(e\) component of the bitmap transform matrix, in signed 8.8 or 1.15 bit fixed-point form. Range 0-131071. The initial value is 256

The initial value is p = 0, v = 256. This represents the value 1.0.

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.BitmapTransformF(v)

Set the \(f\) component of the bitmap transform matrix

Parameters:v (int) – The \(f\) component of the bitmap transform matrix, in signed 15.8 bit fixed-point form. Range 0-16777215. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.BlendFunc(src, dst)

Set pixel arithmetic

Parameters:
  • src (int) – specifies how the source blending factor is computed. One of ZERO, ONE, SRC_ALPHA, DST_ALPHA, ONE_MINUS_SRC_ALPHA or ONE_MINUS_DST_ALPHA. Range 0-7. The initial value is SRC_ALPHA(2)
  • dst (int) – specifies how the destination blending factor is computed, one of the same constants as src. Range 0-7. The initial value is ONE_MINUS_SRC_ALPHA(4)

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.Call(dest)

Execute a sequence of commands at another location in the display list

Parameters:dest (int) – display list address. Range 0-65535
_eve.Cell(cell)

Set the bitmap cell number for the vertex2f command

Parameters:cell (int) – bitmap cell number. Range 0-127. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.ClearColorA(alpha)

Set clear value for the alpha channel

Parameters:alpha (int) – alpha value used when the color buffer is cleared. Range 0-255. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.ClearColorRGB(red, green, blue)

Set clear values for red, green and blue channels

Parameters:
  • red (int) – red value used when the color buffer is cleared. Range 0-255. The initial value is 0
  • green (int) – green value used when the color buffer is cleared. Range 0-255. The initial value is 0
  • blue (int) – blue value used when the color buffer is cleared. Range 0-255. The initial value is 0

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.Clear(c, s, t)

Clear buffers to preset values

Parameters:
  • c (int) – clear color buffer. Range 0-1
  • s (int) – clear stencil buffer. Range 0-1
  • t (int) – clear tag buffer. Range 0-1
_eve.ClearStencil(s)

Set clear value for the stencil buffer

Parameters:s (int) – value used when the stencil buffer is cleared. Range 0-255. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.ClearTag(s)

Set clear value for the tag buffer

Parameters:s (int) – value used when the tag buffer is cleared. Range 0-255. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.ColorA(alpha)

Set the current color alpha

Parameters:alpha (int) – alpha for the current color. Range 0-255. The initial value is 255

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.ColorMask(r, g, b, a)

Enable and disable writing of frame buffer color components

Parameters:
  • r (int) – allow updates to the frame buffer red component. Range 0-1. The initial value is 1
  • g (int) – allow updates to the frame buffer green component. Range 0-1. The initial value is 1
  • b (int) – allow updates to the frame buffer blue component. Range 0-1. The initial value is 1
  • a (int) – allow updates to the frame buffer alpha component. Range 0-1. The initial value is 1

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.ColorRGB(red, green, blue)

Set the drawing color

Parameters:
  • red (int) – red value for the current color. Range 0-255. The initial value is 255
  • green (int) – green for the current color. Range 0-255. The initial value is 255
  • blue (int) – blue for the current color. Range 0-255. The initial value is 255

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.Display()

End the display list

_eve.End()

End drawing a graphics primitive

Vertex2ii() and Vertex2f() calls are ignored until the next Begin().

_eve.Jump(dest)

Execute commands at another location in the display list

Parameters:dest (int) – display list address. Range 0-65535
_eve.LineWidth(width)

Set the width of rasterized lines

Parameters:width (int) – line width in \(1/16\) pixel. Range 0-4095. The initial value is 16

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.Macro(m)

Execute a single command from a macro register

Parameters:m (int) – macro register to read. Range 0-1
_eve.Nop()

No operation

_eve.PaletteSource(addr)

Set the base address of the palette

Parameters:addr (int) – Address in graphics SRAM, 2-byte aligned. Range 0-4194303. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.PointSize(size)

Set the radius of rasterized points

Parameters:size (int) – point radius in \(1/16\) pixel. Range 0-8191. The initial value is 16

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.RestoreContext()

Restore the current graphics context from the context stack

_eve.Return()

Return from a previous call command

_eve.SaveContext()

Push the current graphics context on the context stack

_eve.ScissorSize(width, height)

Set the size of the scissor clip rectangle

Parameters:
  • width (int) – The width of the scissor clip rectangle, in pixels. Range 0-4095. The initial value is hsize
  • height (int) – The height of the scissor clip rectangle, in pixels. Range 0-4095. The initial value is 2048

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.ScissorXY(x, y)

Set the top left corner of the scissor clip rectangle

Parameters:
  • x (int) – The \(x\) coordinate of the scissor clip rectangle, in pixels. Range 0-2047. The initial value is 0
  • y (int) – The \(y\) coordinate of the scissor clip rectangle, in pixels. Range 0-2047. The initial value is 0

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.StencilFunc(func, ref, mask)

Set function and reference value for stencil testing

Parameters:
  • func (int) – specifies the test function, one of NEVER, LESS, LEQUAL, GREATER, GEQUAL, EQUAL, NOTEQUAL, or ALWAYS. Range 0-7. The initial value is ALWAYS(7)
  • ref (int) – specifies the reference value for the stencil test. Range 0-255. The initial value is 0
  • mask (int) – specifies a mask that is ANDed with the reference value and the stored stencil value. Range 0-255. The initial value is 255

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.StencilMask(mask)

Control the writing of individual bits in the stencil planes

Parameters:mask (int) – the mask used to enable writing stencil bits. Range 0-255. The initial value is 255

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.StencilOp(sfail, spass)

Set stencil test actions

Parameters:
  • sfail (int) – specifies the action to take when the stencil test fails, one of KEEP, ZERO, REPLACE, INCR, INCR_WRAP, DECR, DECR_WRAP, and INVERT. Range 0-7. The initial value is KEEP(1)
  • spass (int) – specifies the action to take when the stencil test passes, one of the same constants as sfail. Range 0-7. The initial value is KEEP(1)

These values are part of the graphics context and are saved and restored by SaveContext() and RestoreContext().

_eve.TagMask(mask)

Control the writing of the tag buffer

Parameters:mask (int) – allow updates to the tag buffer. Range 0-1. The initial value is 1

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.Tag(s)

Set the current tag value

Parameters:s (int) – tag value. Range 0-255. The initial value is 255

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.VertexTranslateX(x)

Set the vertex transformation’s x translation component

Parameters:x (int) – signed x-coordinate in \(1/16\) pixel. Range 0-131071. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.VertexTranslateY(y)

Set the vertex transformation’s y translation component

Parameters:y (int) – signed y-coordinate in \(1/16\) pixel. Range 0-131071. The initial value is 0

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.VertexFormat(frac)

Set the precision of vertex2f coordinates

Parameters:frac (int) – Number of fractional bits in X,Y coordinates, 0-4. Range 0-7. The initial value is 4

This value is part of the graphics context and is saved and restored by SaveContext() and RestoreContext().

_eve.Vertex2ii(x, y, handle, cell)
Parameters:
  • x (int) – x-coordinate in pixels. Range 0-511
  • y (int) – y-coordinate in pixels. Range 0-511
  • handle (int) – bitmap handle. Range 0-31
  • cell (int) – cell number. Range 0-127

This method is an alternative to Vertex2f().

_eve.Vertex2f(b)

Draw a point.

Parameters:
  • x (float) – pixel x-coordinate
  • y (float) – pixel y-coordinate
_eve.cmd0(n)

Append the command word n to the FIFO

Parameters:n (int) – The command code

This method is used by the eve module to efficiently add commands to the FIFO.

_eve.cmd(n, fmt, args)

Append a command packet to the FIFO.

Parameters:
  • n (int) – The command code
  • fmt (str) – The command format struct layout
  • args (tuple) – The command’s arguments

Supported format codes: h, H, i, I.

This method is used by the eve module to efficiently add commands to the FIFO.