i965/fs: Define logical framebuffer write opcode.

The logical variant is largely equivalent to the original opcode but
instead of taking a single payload source it expects its arguments
that make up the payload separately as individual sources, like:

 fb_write_logical null, color0, color1, src0_alpha,
                        src_depth, dst_depth, sample_mask, num_components

This patch defines the opcode and usual instruction boilerplate,
including a placeholder lowering function provided mainly as
self-documentation.

Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 4186432ae41..8215a2f9bb1 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -537,6 +537,8 @@ brw_instruction_name(enum opcode op)
       return opcode_descs[op].name;
    case FS_OPCODE_FB_WRITE:
       return "fb_write";
+   case FS_OPCODE_FB_WRITE_LOGICAL:
+      return "fb_write_logical";
    case FS_OPCODE_BLORP_FB_WRITE:
       return "blorp_fb_write";
    case FS_OPCODE_REP_FB_WRITE: