Mesa (gallium-0.1): tgsi: Implement RCC opcode.

[Jose Fonseca]

Module: Mesa
Branch: gallium-0.1
Commit: 6a35d85fbc34f5b53e3b9d0a88261cf70299f03c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6a35d85fbc34f5b53e3b9d0a88261cf70299f03c

Author: Michal Krol <michal at vmware.com>
Date:   Wed Mar 11 12:10:16 2009 +0100

tgsi: Implement RCC opcode.

---

 src/gallium/auxiliary/tgsi/tgsi_exec.c |   33 +++++++++++++++++++++++++++++++-
 1 files changed, 32 insertions(+), 1 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index 8f2986e..9178f48 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -478,6 +478,32 @@ micro_f2ut(
 }
 
 static void
+micro_float_clamp(union tgsi_exec_channel *dst,
+                  const union tgsi_exec_channel *src)
+{
+   uint i;
+
+   for (i = 0; i < 4; i++) {
+      if (src->f[i] > 0.0f) {
+         if (src->f[i] > 1.884467e+019f)
+            dst->f[i] = 1.884467e+019f;
+         else if (src->f[i] < 5.42101e-020f)
+            dst->f[i] = 5.42101e-020f;
+         else
+            dst->f[i] = src->f[i];
+      }
+      else {
+         if (src->f[i] < -1.884467e+019f)
+            dst->f[i] = -1.884467e+019f;
+         else if (src->f[i] > -5.42101e-020f)
+            dst->f[i] = -5.42101e-020f;
+         else
+            dst->f[i] = src->f[i];
+      }
+   }
+}
+
+static void
 micro_flr(
    union tgsi_exec_channel *dst,
    const union tgsi_exec_channel *src )
@@ -2203,7 +2229,12 @@ exec_instruction(
        break;
 
    case TGSI_OPCODE_RCC:
-      assert (0);
+      FETCH(&r[0], 0, CHAN_X);
+      micro_div(&r[0], &mach->Temps[TEMP_1_I].xyzw[TEMP_1_C], &r[0]);
+      micro_float_clamp(&r[0], &r[0]);
+      FOR_EACH_ENABLED_CHANNEL(*inst, chan_index) {
+         STORE(&r[0], 0, chan_index);
+      }
       break;
 
    case TGSI_OPCODE_DPH: