OPENGL ES中几个重要函数详细说明.docVIP

OPENGL ES中几个重要函数详细说明 时间: 2010-04-30 14:47 点击: 2012 次 函数名：glVertexPointer void glVertexPointer(GLint size, GLenum type, GLsizei stride, const GLvoid * pointer) Parameters size Specifies the number of coordinates per vertex. Must be 2, 3, or 4. The initial value is 4. type Specifies the 函数名：glVertexPointervoid glVertexPointer(GLint size,GLenum type,GLsizei stride,const GLvoid * pointer)Parameterssize Specifies the number of coordinates per vertex. Must be 2, 3, or 4. Theinitial value is 4.type Specifies the data type of each vertex coordinate in the array. Symbolicconstants GL_BYTE, GL_SHORT, and GL_FIXED, are accepted. However, theinitial value is GL FLOAT.The common profile accepts the symbolic constant GL FLOAT as well.stride Specifies the byte offset between consecutive vertices. If stride is 0, thevertices are understood to be tightly packed in the array. The initial valueis 0.pointer Specifies a pointer to the first coordinate of the first vertex in the array.The initial value is 0. 参数：size：指定了每个顶点对应的坐标个数，只能是2,3,4中的一个，默认值是4type：指定了数组中每个顶点坐标的数据类 型，可取常量:GL_BYTE, GL_SHORT,GL_FIXED,GL_FLOAT;stride:指定了连续顶点间的字节排列方式，如果为0，数组中的顶点就会被认为是按照紧凑方式排列的，默认值为0pointer:制订了数组中第一个顶点的首地址，默认值为0，对于我们的android，大家可以不 用去管什么地址的，一般给一个IntBuffer就可以了。DescriptionglVertexPointer specifies the location and data of an array of vertex coordinatesto use when rendering. size specifies the number of coordinates per vertex and typethe data type of the coordinates. stride specifies the byte stride from one vertex tothe next allowing vertices and attributes to be packed into a single array or stored in separate arrays. (Single-array storage may be more efficient on some implementations.)When a vertex array is specified, size, type, stride, and pointer are saved asclient-side state.If the vertex array is enabled, it is used when glDrawArrays, or glDrawElementsis called. To enable and disable the vertex array, call glEnableClientStateand glDisableClientState with the argume