Field returns pointer of the filed in the pool.

Random returns a value between [Base-Var/2, Base+Var/2].

AddChan adds new fields to the pool.

Associates a buffer with a buffer target.

Initialize the particle simulator.

Create a new TransformComp for the entity, Return the old one, if it already exist .

Transform transforms (x, y) to (x1, y). matrix multiplication carried out on paper: |1 x| |c -s | |sx | | 1 ky | |1 -ox| | 1 y| |s c |

Return the TransformComp or nil

3-------2 | | | | 0-------1

conversion: depth range [-int16, int16]

Used returns whether the value is empty.

Creates a buffer in memory and initializes it with array data. If no array is provided, the contents of the buffer is initialized to 0.

stream decode

Turns off specific WebGL capabilities for this context.

Turns on specific WebGL capabilities for this context.

Free free all resource managed by R. Including index-buffer, vertex-buffer, texture, uniform and shader program.

每次绘制都会产生一个 Command （可能会造成内存浪费! 1k cmd = 1000 * 6 * 4 = 24k） 为了减少内存可以一边添加一边尝试向前合并

Specifies color values to use by the clear method to clear the color buffer.

primitive operation, auto scale by 1024

Set local position relative to parent

复制简单数据的时候（比如：Sampler），采用赋值的方式可能更快 TODO

size

Sets texture parameters for the current texture unit.

** Returns the number of tuple values read (2 or 4). */

Specifies the active texture unit.

AllocUniform get the uniform slot in a shader program, Return the resource handler.

Binds a named texture object to a target.

GC removes dead particles from the Pool.

Write the result to vertex-buffer.

Attaches a WebGLShader object to a WebGLProgram object.

Used to modify or update some or all of a data store for a bound buffer object.

Deletes a specific shader object.

Sets a function to use to compare incoming pixel depth to the current depth buffer value.

Turns off a vertex attribute array at a specific index position.

Returns an index to the location in a program of a named attribute variable.

default: thickness=1.0

Rate returns new particles that should spawn.

Texture returns the low-level Texture struct.

Assigns a integer value to a uniform variable for the current program object.

Assigns 4 floating point values to a uniform variable for the current program object.

Sets values for a 4x4 floating point vector matrix into a uniform location as a matrix or a matrix array.

Set the program object to use for rendering.

public function vertexAttrib1f(indx:GLuint, x:GLfloat) : Void; public function vertexAttrib2f(indx:GLuint, x:GLfloat, y:GLfloat) : Void; public functi

计算单个UI元素 如果有大小则记录出偏移和Margin 否则只返回元素

Sets the blending factors used to combine source and destination pixels.

Lets you set whether individual colors can be written when drawing or rendering to a framebuffer.

Compiles the GLSL shader source into binary data used by the WebGLProgram object.