API

Introduction

The main functions of the API are listed here, the features of the work of the environment are described

WOWCube Paradigms

WOWCube executes 8 copies of the byte-code of the script at the same time, providing functions for the interaction of scripts with each other, drawing functions, functions for accessing resources, and other specific functions. Each copy of the script has access to 3 displays. Resource scripts are packed into a package.

Pawn API

Graphic functions

Graphics 2D acceleration (G2D)

WOWCube provides the 2D acceleration interfaces to enhance gaming experience . Basically G2D engine allows to blend up to the 4 image layers at once with a HW acceleration. However there is no limit of layers, they are blended in a cascade. For example, if Pawn script requested 7 layers to be blended then 2 HW blending will occur:

Result of the blending can be saved as an internal G2D resource or flushed immediately on the specified display. Internal G2D resources can be used as an usual bitmap primitive (abi_CMD_BITMAP) or reused as an input for the next G2D action. Basic coordinate principle:

Coordinates are limited from -2048 to 2047. Maximum layers size is 240x240.

abi_CMD_G2D_BEGIN_BITMAP

Syntax:

abi_CMD_G2D_BEGIN_BITMAP(const resID, const width, const height, const bool:replace)

Description:

abi_CMD_G2D_BEGIN_BITMAP and abi_CMD_G2D_END delimits the group of layers to be blended into internal G2D resource. This API is not intended for frequent usage. It is better suited for complex background generation on game initialization or dynamic resource modification triggered by rare game events.

Arguments:

resID

ID of the resource that will be generated from blending layers presented between abi_CMD_G2D_BEGIN_BITMAP and the subsequent abi_CMD_G2D_END. G2D engine can keep up to 3 different resources with IDs: 0, 1 and 2.

width

Width of the resulting resource. G2D engine can keep resource of 240px width maximum.

height

Height of the resulting resource. G2D engine can keep resource of 240px height maximum.

replace

If true, then an existing image will be replaced completely, otherwise it will be overwritten by reusing itself as a background layer.

abi_CMD_G2D_BEGIN_DISPLAY

Syntax:

abi_CMD_G2D_BEGIN_DISPLAY(const display, const bool:replace)

Description:

abi_CMD_G2D_BEGIN_DISPLAY and abi_CMD_G2D_END delimits the group of layers to be blended directly into display framebuffer. Obviously this API is designed for rendering scene on game tick. This API is not limited by layers count as well as abi_CMD_G2D_BEGIN_BITMAP. However it is strictly recommended to blend no more than 4 layers. Otherwise cascade blending will be initiated resulting in some FPS drop.

Arguments:

display

ID of the display which framebuffer will be used for blending. Each module have 3 displays with ID starting from 0.

replace

If true then an existing image will be replaced completely, otherwise it will be overwritten by reusing itself as a background layer.

abi_CMD_G2D_ADD_SPRITE

Syntax:

abi_CMD_G2D_ADD_SPRITE(const resID, const bool:g2d, const x, const y, const alpha, const color, const rotation, const mirror)

Description:

Specifies game resource which will be used as a layer for blending.

Arguments:

resID

ID of the resource to be uses as a layer.

g2d

Indicates if an internal G2D resource is specified or not.

x, y

Coordinates of the bitmap center to place on the layer.

alpha

Layer transparency in range between 0x00 and 0xFF, where 0x00 is a fully transparent layer.

color

Layer's source key - a color in ARGB8888 format to be avoided.

rotation

Clockwise rotation angle in degrees. It is possible to specify free angle, but only right angles have HW acceleration. Currently rotation only applicable for external resources.

mirror

Mirroring variant. Possible values are self-explained: MIRROR_BLANK, MIRROR_X, MIRROR_Y, MIRROR_XY.

abi_CMD_G2D_ADD_RECTANGLE

Syntax:

abi_CMD_G2D_ADD_RECTANGLE(const x, const y, const width, const height, const color)

Description:

Specifies rectangle area which will be used as layer of blending. This API is not intended for frequent usage, i.e. particles generation. It is better suited for changing image background or applying color mask.

Arguments:

x, y

Coordinates of top left rectangle corner.

width

Rectangle width.

height

Rectangle height.

color

Rectangle color in ARGB8888 format.

abi_CMD_G2D_END

Syntax:

abi_CMD_G2D_END()

Description:

abi_CMD_G2D_END() and abi_CMD_G2D_BEGIN_BITMAP/abi_CMD_G2D_BEGIN_DISPLAY delimits the group of layers to be blended. After abi_CMD_G2D_END call final blending will be initiated and results will be stored according to the begin comand.

Examples

1. Render into inner G2D resource buffer #face and display it on the display #face. Please, note that last argument of abi_CMD_BITMAP is a `true` flag, which means G2D resource should be used:

...
abi_CMD_G2D_BEGIN_BITMAP(face, 240, 240, true);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize0, 120 - animationSquareSize0, animationSquareSize0 * 2, animationSquareSize0 * 2, 0xdfff0000);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize1, 120 - animationSquareSize1, animationSquareSize1 * 2, animationSquareSize1 * 2, 0xdfffff00);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize2, 120 - animationSquareSize2, animationSquareSize2 * 2, animationSquareSize2 * 2, 0xdfff00ff);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize3, 120 - animationSquareSize3, animationSquareSize3 * 2, animationSquareSize3 * 2, 0xdf00ffff);
abi_CMD_G2D_ADD_SPRITE(resID, false, 120, 120, animationAlpha, 0x00000000, animationAngle, MIRROR_BLANK);
abi_CMD_G2D_END();
...
abi_CMD_BITMAP(face, 120, 120, 0, MIRROR_BLANK, true);
...
abi_CMD_REDRAW(face);
...

2. Render directly into display framebuffer #face. This will produce same result on display as example #1, but the generated image is not saved:

...
abi_CMD_G2D_BEGIN_DISPLAY(face, true);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize0, 120 - animationSquareSize0, animationSquareSize0 * 2, animationSquareSize0 * 2, 0xdfff0000);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize1, 120 - animationSquareSize1, animationSquareSize1 * 2, animationSquareSize1 * 2, 0xdfffff00);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize2, 120 - animationSquareSize2, animationSquareSize2 * 2, animationSquareSize2 * 2, 0xdfff00ff);
abi_CMD_G2D_ADD_RECTANGLE(120 - animationSquareSize3, 120 - animationSquareSize3, animationSquareSize3 * 2, animationSquareSize3 * 2, 0xdf00ffff);
abi_CMD_G2D_ADD_SPRITE(resID, false, 120, 120, animationAlpha, 0x00000000, animationAngle, MIRROR_BLANK);
abi_CMD_G2D_END();
...

Font drawing functions

abi_CMD_TEXT

API:

 abi_CMD_TEXT(const text[], const fontResID, const x, const y, const scale, const angle, const r, const g, const b)

Description:

Intended to render a system font or a custom font from resources with specified coordinates, scale and rotation at an arbitrary angle.

Arguments:

text

Array of chars.

fontResID

Custom font resource identifier.

x, y

Coordinates of top left rectangle corner.

scale, angle

Percentage scale and clockwise rotation angle in degrees. Max size of font is 200x200 px. (scale = 100%)

r, g, b

Font color in RGB format.

Example:

new text[4] = ['A', 'p', 'p', '\0'];
abi_CMD_TEXT(text, RES_ID_FONT, 90, 160, 16, current_angles[face], 255, 0, 0);

TEXTURE drawing functions

abi_CMD_DYNAMIC_TEXTURE

API:

abi_CMD_DYNAMIC_TEXTURE(const effectId = 1, const time = any value, const args[] = {0x04030201, 0x08070605, 0x00000A09}, const argsCount = 3, const bool:g2d = false)

Description:

Render a texture with chosen algorithm and parameters.

Arguments:

effectId

Define algorithm to render texture.

Available values : G2D_DYNAMIC_TEXTURE_MOSAIC

time

Current time value. Use any fixed value to static texture or set current time value in milliseconds to make texture alive.

args, argsCount

Byte stream of algorithm settings it's aligned to 4 bytes, because of pawn supports only 32-bit values.

Size of array depends on algorithm. For example mosaic algorithm has size of settings equals 10 bytes , so we must use aligned 4 bytes - 12 bytes array and argsCount = 3

g2d

false - Use pawn default buffer to draw texture.

true - Use g2d buffer to draw texture - not supported now.

G2D_DYNAMIC_TEXTURE_MOSAIC alogrithm description

So in effect named 'mosaic' we have settings of 10 parameters each one 1 byte

Noise factors :

factor x : values from 0 to 10

factor y : values from 0 to 10

factor xy : values from 0 to 10

Time factors :

factor x : values from 0 to 10

factor y : values from 0 to 10

factor xy : values from 0 to 10

Color factors :

r : values from 0 to 10

g : values from 0 to 10

b : values from 0 to 10

Zoom factor :

zoom values from 0 to 10

For example we want to set all parameters above with values in order 1,2,3,4,5,6,7,8,9,10. Take in attention that each parameter is 1 byte we must make array of 32-bit values 0x04030201, 0x08070605, 0x00000A09

Example:

mosaic_effect_settings = { 0x04030201, 0x08070605, 0x00000A09  };
mosaic_effect_settings_length = 3;
abi_CMD_TEXT(G2D_DYNAMIC_TEXTURE_MOSAIC , currentTime, mosaic_effect_settings, mosaic_effect_settings_length);