Compute ceil(log2(x)). * @param x value used to compute ceil(log2(x)) * @return computed ceiling of log2(x) */

* Clip a signed 64bit integer value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax

* Clip a signed integer value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximu

* Clip a signed integer value into the -32768,32767 range. * @param a value to clip * @return clipped value */

* Clip a signed integer value into the -128,127 range. * @param a value to clip * @return clipped value */

* Clip a signed integer into the -(2^p),(2^p-1) range. * @param a value to clip * @param p bit position to clip at * @return clipped value */

* Clip a signed integer value into the 0-65535 range. * @param a value to clip * @return clipped value */

* Clip a signed integer value into the 0-255 range. * @param a value to clip * @return clipped value */

* Clip a signed integer to an unsigned power of two range. * @param a value to clip * @param p bit position to clip at * @return clipped value *

* Clip a double value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value

* Clip a float value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value o

* Clip a signed 64-bit integer value into the -2147483648,2147483647 range. * @param a value to clip * @return clipped value */

* Compare two rationals. * * @param a First rational * @param b Second rational * * @return One of the following values: * - 0 if `a ==

* Return a pointer to the data stored in a FIFO buffer at a certain offset. * The FIFO buffer is not modified. * * @param f AVFifoBuffer to peek

* Reinterpret a 32-bit integer as a float. */

* Locale-independent conversion of ASCII isgraph. */

* Locale-independent conversion of ASCII isxdigit. */

* Get the next random unsigned 32-bit number using an ALFG. * * Please also consider a simple LCG like state= state*1664525+1013904223, * it may be

* Fill the provided buffer with a string containing an error string * corresponding to the AVERROR code errnum. * * @param errbuf a buffer

* Create an AVRational. * * Useful for compilers that do not support compound literals. * * @note The return value is not reduced. * @see av_redu

* Get the next random unsigned 32-bit number using a MLFG. * * Please also consider av_lfg_get() above, it is faster. */

* Clear high bits from an unsigned integer starting with specific bit position * @param a value to clip * @param p bit position to clip at * @ret

* Count number of bits set to one in x * @param x value to count bits of * @return the number of bits set to one in x */

* Count number of bits set to one in x * @param x value to count bits of * @return the number of bits set to one in x */

* Add two signed 32-bit values with saturation. * * @param a one value * @param b another value * @return sum with signed saturation */

* Add a doubled value to another value with saturation at both stages. * * @param a first value * @param b value doubled and added to a * @retur

* Multiply two `size_t` values checking for overflow. * * @param[in] a,b Operands of multiplication * @param[out] r Pointer to the result of the

* Get the count of continuous non zero chars starting from the beginning. * * @param len maximum number of characters to check in the string, that

* Fill the provided buffer with a string containing a timestamp * representation. * * @param buf a buffer with size in bytes of at least AV_TS_MAX_

* Fill the provided buffer with a string containing a timestamp time * representation. * * @param buf a buffer with size in bytes of at least AV_TS

Note: these do not follow the BSD/Apple/GNU convention of returning -1 for -Inf, +1 for Inf, 0 otherwise, but merely follow the POSIX/ISO mandated spe

Replaces the fragment shader.

connect @return @throws IOException

Allocates a direct float buffer, and populates it with the float array data.

Creates a texture from raw data. @param data Image data, in a "direct" ByteBuffer. @param width Texture width, in pixels (not bytes). @param height T

Creates an EGL surface associated with an offscreen buffer.

绘制的时候， 输入程序从外部读取纹理并渲染到FBO纹理上， 中间件程序从FBO读取纹理并渲染到FBO纹理上， 输出程序从FBO读取纹理并渲染到外部(Surface,FBO 等)

Issues the draw call. Does the full setup on every call. @param mvpMatrix The 4x4 projection matrix. @param vertexBuffer Buffer with vertex