diff options
| -rw-r--r-- | src/mesa/main/transformfeedback.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/mesa/main/transformfeedback.c b/src/mesa/main/transformfeedback.c index befc74444c5..a5ea2a5eb77 100644 --- a/src/mesa/main/transformfeedback.c +++ b/src/mesa/main/transformfeedback.c @@ -1402,12 +1402,34 @@ _mesa_GetTransformFeedbacki64_v(GLuint xfb, GLenum pname, GLuint index, return; } + /** + * This follows the same general rules used for BindBufferBase: + * + * "To query the starting offset or size of the range of a buffer + * object binding in an indexed array, call GetInteger64i_v with + * target set to respectively the starting offset or binding size + * name from table 6.5 for that array. Index must be in the range + * zero to the number of bind points supported minus one. If the + * starting offset or size was not specified when the buffer object + * was bound (e.g. if it was bound with BindBufferBase), or if no + * buffer object is bound to the target array at index, zero is + * returned." + */ + if (obj->RequestedSize[index] == 0 && + (pname == GL_TRANSFORM_FEEDBACK_BUFFER_START || + pname == GL_TRANSFORM_FEEDBACK_BUFFER_SIZE)) { + *param = 0; + return; + } + compute_transform_feedback_buffer_sizes(obj); switch(pname) { case GL_TRANSFORM_FEEDBACK_BUFFER_START: + assert(obj->RequestedSize[index] > 0); *param = obj->Offset[index]; break; case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE: + assert(obj->RequestedSize[index] > 0); *param = obj->Size[index]; break; default: |