diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/pipe/tgsi/exec/tgsi_exec.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.c b/src/mesa/pipe/tgsi/exec/tgsi_exec.c index d5a2639af1a..3f464372ca5 100644 --- a/src/mesa/pipe/tgsi/exec/tgsi_exec.c +++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.c @@ -926,7 +926,7 @@ fetch_src_file_channel( break; case TGSI_FILE_OUTPUT: - /* vertex varying/output vars can be read too */ + /* vertex/fragment output vars can be read too */ chan->u[0] = mach->Outputs[index->i[0]].xyzw[swizzle].u[0]; chan->u[1] = mach->Outputs[index->i[1]].xyzw[swizzle].u[1]; chan->u[2] = mach->Outputs[index->i[2]].xyzw[swizzle].u[2]; @@ -1989,16 +1989,24 @@ exec_instruction( break; case TGSI_OPCODE_TEX: - /* src arg0 is the texcoord */ + /* simple texture lookup */ + /* src[0] is the texcoord */ + /* src[1] is the sampler unit */ exec_tex(mach, inst, FALSE); break; case TGSI_OPCODE_TXB: - /* Texture lookup with lod bias (src0.w) */ + /* Texture lookup with lod bias */ + /* src[0] is the texcoord (src[0].w = load bias) */ + /* src[1] is the sampler unit */ exec_tex(mach, inst, TRUE); break; case TGSI_OPCODE_TXD: + /* Texture lookup with explict partial derivatives */ + /* src[0] = texcoord */ + /* src[1] = d[strq]/dx */ + /* src[2] = d[strq]/dy */ assert (0); break; |