glGetVertexAttrib — Return a generic vertex attribute parameter
void glGetVertexAttribfv( | GLuint index, |
| GLenum pname, | |
GLfloat *params); |
void glGetVertexAttribiv( | GLuint index, |
| GLenum pname, | |
GLint *params); |
void glGetVertexAttribIiv( | GLuint index, |
| GLenum pname, | |
GLint *params); |
void glGetVertexAttribIuiv( | GLuint index, |
| GLenum pname, | |
GLuint *params); |
index Specifies the generic vertex attribute parameter to be queried.
pname Specifies the symbolic name of the vertex attribute parameter to be queried. Accepted values are GL_CURRENT_VERTEX_ATTRIB, 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, GL_VERTEX_ATTRIB_ARRAY_INTEGER, GL_VERTEX_ATTRIB_ARRAY_DIVISOR, or GL_VERTEX_ATTRIB_BINDING.
params Returns 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_CURRENT_VERTEX_ATTRIB
params returns four values that represent the current value for the generic vertex attribute specified by index. The initial value for all generic vertex attributes is (0,0,0,1).
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_INT, GL_INT_2_10_10_10_REV, GL_UNSIGNED_INT, GL_FIXED, GL_HALF_FLOAT, 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_VERTEX_ATTRIB_ARRAY_INTEGER
params returns a single value that is non-zero (true) if fixed-point data types for the vertex attribute array indicated by index have integer data types, and 0 (false) otherwise. The initial value is 0 (GL_FALSE).
GL_VERTEX_ATTRIB_ARRAY_DIVISOR
params returns a single value that is the frequency divisor used for instanced rendering. See glVertexAttribDivisor. The initial value is 0.
GL_VERTEX_ATTRIB_BINDING
params returns a single value that is the current vertex buffer binding of the vertex attribute. See glVertexAttribBinding.
All of the parameters except GL_CURRENT_VERTEX_ATTRIB represent state stored in the currently bound vertex array object. If the zero object is bound, these values are client state.
If an error is generated, no change is made to the contents of params.
GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS.
GL_INVALID_ENUM is generated if pname is not an accepted value.
glGet with argument GL_MAX_VERTEX_ATTRIBS
glGetVertexAttribPointerv with arguments index and GL_VERTEX_ATTRIB_ARRAY_POINTER
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
glGetVertexAttribfv | ✔ | ✔ | ✔ |
glGetVertexAttribiv | ✔ | ✔ | ✔ |
glGetVertexAttribIiv | - | ✔ | ✔ |
glGetVertexAttribIuiv | - | ✔ | ✔ |
glBindAttribLocation, glBindBuffer, glDisableVertexAttribArray, glEnableVertexAttribArray, glVertexAttrib, glVertexAttribDivisor, glVertexAttribPointer
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