[Mesa-dev] [PATCH 14/20] i965/fs: Add support for W-tiled coordinate swizzling

[Topi Pohjolainen]

---
 src/mesa/drivers/dri/i965/brw_fs.h           |  4 ++++
 src/mesa/drivers/dri/i965/brw_fs_emitter.cpp | 23 +++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 26e5545..a30351d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -291,6 +291,10 @@ protected:
    fs_inst *emit(fs_inst *inst);
    void emit(exec_list list);
 
+   void emit_coord_swizzling(const fs_reg& t1,
+                             const fs_reg& x,
+                             const fs_reg& y);
+
    void push_force_uncompressed();
    void pop_force_uncompressed();
 
diff --git a/src/mesa/drivers/dri/i965/brw_fs_emitter.cpp b/src/mesa/drivers/dri/i965/brw_fs_emitter.cpp
index 74500fb..22fa33d 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_emitter.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_emitter.cpp
@@ -185,6 +185,29 @@ fs_emitter::pop_force_uncompressed()
    assert(force_uncompressed_stack >= 0);
 }
 
+void
+fs_emitter::emit_coord_swizzling(const fs_reg& t1,
+                                 const fs_reg& x,
+                                 const fs_reg& y)
+{
+   fs_inst* inst;
+
+   /* If 4th bit is set in x-coord, the 4th bit in y-coord gets flipped */
+   emit(AND(t1, x, brw_imm_uw(0x8))); /* x & 0x8 */
+   inst = emit(BRW_OPCODE_CMP, reg_null_f, t1, brw_imm_uw(0));
+   inst->conditional_mod = BRW_CONDITIONAL_NZ;
+   emit(BRW_OPCODE_IF);
+   emit(AND(t1, y, brw_imm_uw(0x8))); /* y & 0x8 */
+   inst = emit(BRW_OPCODE_CMP, reg_null_f, t1, brw_imm_uw(0));
+   inst->conditional_mod = BRW_CONDITIONAL_NZ;
+   emit(BRW_OPCODE_IF);
+   inst = emit(AND(y, y, brw_imm_uw(0xfff7)));
+   emit(BRW_OPCODE_ELSE);
+   inst = emit(OR(y, y, brw_imm_uw(0x8)));
+   emit(BRW_OPCODE_ENDIF);
+   emit(BRW_OPCODE_ENDIF);
+}
+
 fs_emitter::fs_emitter(struct brw_context *brw,
                        struct brw_wm_compile *c,
                        unsigned dispatch_width)
-- 
1.8.3.1