glGetVertexAttrib — return a generic vertex attribute parameter
void glGetVertexAttribfv( | GLuint index, |
| GLenum pname, | |
GLfloat *params); |
void glGetVertexAttribiv( | GLuint index, |
| GLenum pname, | |
GLint *params); |
indexSpecifies the generic vertex attribute parameter to be queried.
pnameSpecifies the symbolic name of the vertex attribute parameter to be queried. Accepted values are GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, GL_VERTEX_ATTRIB_ARRAY_ENABLED, GL_VERTEX_ATTRIB_ARRAY_SIZE, GL_VERTEX_ATTRIB_ARRAY_STRIDE, GL_VERTEX_ATTRIB_ARRAY_TYPE, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, or GL_CURRENT_VERTEX_ATTRIB.
paramsReturns the requested data.
glGetVertexAttrib returns in params the value of a generic vertex attribute parameter. The generic vertex attribute to be queried is specified by index, and the parameter to be queried is specified by pname.
The accepted parameter names are as follows:
GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING params returns a single value, the name of the buffer object currently bound to the binding point corresponding to generic vertex attribute array index. If no buffer object is bound, 0 is returned. The initial value is 0.
GL_VERTEX_ATTRIB_ARRAY_ENABLED params returns a single value that is non-zero (true) if the vertex attribute array for index is enabled and 0 (false) if it is disabled. The initial value is GL_FALSE.
GL_VERTEX_ATTRIB_ARRAY_SIZE params returns a single value, the size of the vertex attribute array for index. The size is the number of values for each element of the vertex attribute array, and it will be 1, 2, 3, or 4. The initial value is 4.
GL_VERTEX_ATTRIB_ARRAY_STRIDE params returns a single value, the array stride for (number of bytes between successive elements in) the vertex attribute array for index. A value of 0 indicates that the array elements are stored sequentially in memory. The initial value is 0.
GL_VERTEX_ATTRIB_ARRAY_TYPE params returns a single value, a symbolic constant indicating the array type for the vertex attribute array for index. Possible values are GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT, GL_UNSIGNED_SHORT, GL_FIXED, and GL_FLOAT. The initial value is GL_FLOAT.
GL_VERTEX_ATTRIB_ARRAY_NORMALIZED params returns a single value that is non-zero (true) if fixed-point data types for the vertex attribute array indicated by index are normalized when they are converted to floating point, and 0 (false) otherwise. The initial value is GL_FALSE.
GL_CURRENT_VERTEX_ATTRIB params returns four values that represent the current value for the generic vertex attribute specified by index. The initial value is (0,0,0,1).
All of the parameters except GL_CURRENT_VERTEX_ATTRIB represent client-side state.
GL_INVALID_ENUM is generated if pname is not an accepted value.
GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.
glGet with argument GL_MAX_VERTEX_ATTRIBS
glGetVertexAttribPointerv with arguments index and GL_VERTEX_ATTRIB_ARRAY_POINTER
glBindAttribLocation, glBindBuffer, glDisableVertexAttribArray, glEnableVertexAttribArray, glVertexAttrib, glVertexAttribPointer
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