Mesa (master): i965/fs: Respect ARB_color_buffer_float clamping.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: 4fdd289805d14d4f7a234f88cd375be1b3b96764
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4fdd289805d14d4f7a234f88cd375be1b3b96764

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Jul 25 18:50:43 2011 -0700

i965/fs: Respect ARB_color_buffer_float clamping.

This was done in the old codegen path, but not the new one.  Caught by
piglit fbo tests after the conversion to GLSL ff_fragment_shader.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |   21 +++++++++++++++------
 1 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index b82dfd5..4f599fb 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1745,6 +1745,7 @@ void
 fs_visitor::emit_color_write(int index, int first_color_mrf, fs_reg color)
 {
    int reg_width = c->dispatch_width / 8;
+   fs_inst *inst;
 
    if (c->dispatch_width == 8 || intel->gen == 6) {
       /* SIMD8 write looks like:
@@ -1763,8 +1764,10 @@ fs_visitor::emit_color_write(int index, int first_color_mrf, fs_reg color)
        * m + 6: a0
        * m + 7: a1
        */
-      emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index * reg_width),
-	   color);
+      inst = emit(BRW_OPCODE_MOV,
+		  fs_reg(MRF, first_color_mrf + index * reg_width),
+		  color);
+      inst->saturate = c->key.clamp_fragment_color;
    } else {
       /* pre-gen6 SIMD16 single source DP write looks like:
        * m + 0: r0
@@ -1782,16 +1785,22 @@ fs_visitor::emit_color_write(int index, int first_color_mrf, fs_reg color)
 	  * usual destination + 1 for the second half we get
 	  * destination + 4.
 	  */
-	 emit(BRW_OPCODE_MOV,
-	      fs_reg(MRF, BRW_MRF_COMPR4 + first_color_mrf + index), color);
+	 inst = emit(BRW_OPCODE_MOV,
+		     fs_reg(MRF, BRW_MRF_COMPR4 + first_color_mrf + index),
+		     color);
+	 inst->saturate = c->key.clamp_fragment_color;
       } else {
 	 push_force_uncompressed();
-	 emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index), color);
+	 inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index),
+		     color);
+	 inst->saturate = c->key.clamp_fragment_color;
 	 pop_force_uncompressed();
 
 	 push_force_sechalf();
 	 color.sechalf = true;
-	 emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index + 4), color);
+	 inst = emit(BRW_OPCODE_MOV, fs_reg(MRF, first_color_mrf + index + 4),
+		     color);
+	 inst->saturate = c->key.clamp_fragment_color;
 	 pop_force_sechalf();
 	 color.sechalf = false;
       }