diff options
| -rw-r--r-- | shared-core/r300_reg.h | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/shared-core/r300_reg.h b/shared-core/r300_reg.h index 3ce09c16..e59919be 100644 --- a/shared-core/r300_reg.h +++ b/shared-core/r300_reg.h @@ -336,13 +336,15 @@ USE OR OTHER DEALINGS IN THE SOFTWARE. * The meaning of the two UNKNOWN fields is obviously not known. However, * experiments so far have shown that both *must* point to an instruction * inside the vertex program, otherwise the GPU locks up. + * * fglrx usually sets CNTL_3_UNKNOWN to the end of the program and - * CNTL_1_UNKNOWN points to instruction where last write to position takes - * place. + * R300_PVS_CNTL_1_POS_END_SHIFT points to instruction where last write to + * position takes place. + * * Most likely this is used to ignore rest of the program in cases * where group of verts arent visible. For some reason this "section" * is sometimes accepted other instruction that have no relationship with - *position calculations. + * position calculations. */ #define R300_VAP_PVS_CNTL_1 0x22D0 # define R300_PVS_CNTL_1_PROGRAM_START_SHIFT 0 |