[Mesa-dev] [RFC 23/27] i965/fs: Add helper for emitting plain texture resinfo messages

[Topi Pohjolainen]

Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
---
 src/mesa/drivers/dri/i965/brw_fs.h           |  2 ++
 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 21 +++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index b4b146a..968ae77 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -513,6 +513,8 @@ public:
 
    void visit_atomic_counter_intrinsic(ir_call *ir);
 
+   fs_reg fetch_resinfo(int sampler, const fs_reg& lod);
+
    struct gl_fragment_program *fp;
 
    int *param_size;
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index ed19157..42836ac 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1567,6 +1567,27 @@ fs_visitor::emit_mcs_fetch(ir_texture *ir, fs_reg coordinate, int sampler)
    return dest;
 }
 
+fs_reg
+fs_visitor::fetch_resinfo(int sampler, const fs_reg& lod)
+{
+   fs_reg info = fs_reg(this, glsl_type::get_instance(GLSL_TYPE_UINT, 4, 1));
+   fs_reg payload = brw->gen >= 7 ? fs_reg(this, glsl_type::float_type) :
+                                    fs_reg(MRF, 2, BRW_REGISTER_TYPE_UD);
+   fs_inst *fetch;
+
+   emit(MOV(retype(payload, BRW_REGISTER_TYPE_UD), lod));
+   
+   if (brw->gen >= 7)
+      fetch = emit(SHADER_OPCODE_TEX_RESINFO, info, payload);
+   else
+      fetch = emit(SHADER_OPCODE_TEX_RESINFO, info);
+
+   fetch->sampler = sampler;
+   fetch->regs_written = 4;
+
+   return info;
+}
+
 void
 fs_visitor::visit(ir_texture *ir)
 {
-- 
1.8.3.1