Mesa (master): st/mesa: lower DFRACEXP/DLDEXP when they are not supported

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: 6316c90cc0daa9e9476b00e3c52c51190e782c3f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6316c90cc0daa9e9476b00e3c52c51190e782c3f

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Fri Jul 18 00:38:59 2014 -0400

st/mesa: lower DFRACEXP/DLDEXP when they are not supported

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Reviewed-by: Dave Airlie <airlied at redhat.com>

---

 src/mesa/state_tracker/st_glsl_to_tgsi.cpp |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 1723c3f..0b34771 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5707,6 +5707,8 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
       unsigned ptarget = shader_stage_to_ptarget(stage);
       bool have_dround = pscreen->get_shader_param(pscreen, ptarget,
                                                    PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED);
+      bool have_dfrexp = pscreen->get_shader_param(pscreen, ptarget,
+                                                   PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED);
 
       /* If there are forms of indirect addressing that the driver
        * cannot handle, perform the lowering pass.
@@ -5744,6 +5746,7 @@ st_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
                          EXP_TO_EXP2 |
                          LOG_TO_LOG2 |
                          LDEXP_TO_ARITH |
+                         (have_dfrexp ? 0 : DFREXP_DLDEXP_TO_ARITH) |
                          CARRY_TO_ARITH |
                          BORROW_TO_ARITH |
                          (have_dround ? 0 : DOPS_TO_DFRAC) |