[Mesa-dev] [PATCH 5/7] i965: Define helper function to copy an arbitrary live component from some register.

[Francisco Jerez]

---
 src/mesa/drivers/dri/i965/brw_fs.h             |  2 ++
 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp   | 12 ++++++++++++
 src/mesa/drivers/dri/i965/brw_vec4.h           |  3 +++
 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 11 +++++++++++
 4 files changed, 28 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 6e5fa1d..df6b825 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -306,6 +306,8 @@ public:
                  const fs_reg &a);
    void emit_minmax(enum brw_conditional_mod conditionalmod, const fs_reg &dst,
                     const fs_reg &src0, const fs_reg &src1);
+   /** Copy any live channel from \p src to the first channel of \p dst. */
+   void emit_uniformize(const fs_reg &dst, const fs_reg &src);
    bool try_emit_saturate(ir_expression *ir);
    bool try_emit_line(ir_expression *ir);
    bool try_emit_mad(ir_expression *ir);
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 4b48f2d..6f1ff20 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -337,6 +337,18 @@ fs_visitor::emit_minmax(enum brw_conditional_mod conditionalmod, const fs_reg &d
    }
 }
 
+void
+fs_visitor::emit_uniformize(const fs_reg &dst, const fs_reg &src)
+{
+   const fs_reg chan_index = vgrf(glsl_type::uint_type);
+
+   emit(SHADER_OPCODE_FIND_LIVE_CHANNEL, component(chan_index, 0))
+      ->force_writemask_all = true;
+   emit(SHADER_OPCODE_BROADCAST, component(dst, 0),
+        src, component(chan_index, 0))
+      ->force_writemask_all = true;
+}
+
 bool
 fs_visitor::try_emit_saturate(ir_expression *ir)
 {
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 7a92d59..adb5fe4 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -298,6 +298,9 @@ public:
    void emit_lrp(const dst_reg &dst,
                  const src_reg &x, const src_reg &y, const src_reg &a);
 
+   /** Copy any live channel from \p src to the first channel of \p dst. */
+   void emit_uniformize(const dst_reg &dst, const src_reg &src);
+
    void emit_block_move(dst_reg *dst, src_reg *src,
                         const struct glsl_type *type, brw_predicate predicate);
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index f6f589d..4515fc7 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -1304,6 +1304,17 @@ vec4_visitor::emit_lrp(const dst_reg &dst,
 }
 
 void
+vec4_visitor::emit_uniformize(const dst_reg &dst, const src_reg &src)
+{
+   const src_reg chan_index(this, glsl_type::uint_type);
+
+   emit(SHADER_OPCODE_FIND_LIVE_CHANNEL, dst_reg(chan_index))
+      ->force_writemask_all = true;
+   emit(SHADER_OPCODE_BROADCAST, dst, src, chan_index)
+      ->force_writemask_all = true;
+}
+
+void
 vec4_visitor::visit(ir_expression *ir)
 {
    unsigned int operand;
-- 
2.1.3