mesa: implement clamping controls (ARB_color_buffer_float)

Squashed commit of the following:

Author: Marek Olšák <[email protected]>

    mesa: fix getteximage so that it doesn't clamp values
    mesa: update the compute_version function
    mesa: add display list support for ARB_color_buffer_float
    mesa: fix glGet query with GL_ALPHA_TEST_REF and ARB_color_buffer_float

commit b2f6ddf907935b2594d2831ddab38cf57a1729ce
Author: Luca Barbieri <[email protected]>
Date:   Tue Aug 31 16:50:57 2010 +0200

    mesa: document known possible deviations from ARB_color_buffer_float

commit 5458935be800c1b19d1c9d1569dc4fa30a97e8b8
Author: Luca Barbieri <[email protected]>
Date:   Tue Aug 24 21:54:56 2010 +0200

    mesa: expose GL_ARB_color_buffer_float

commit aef5c3c6be6edd076e955e37c80905bc447f8a82
Author: Luca Barbieri <[email protected]>
Date:   Thu Aug 26 18:12:34 2010 +0200

    mesa, mesa/st: handle read color clamping properly

    (I'll squash the st/mesa part to a separate commit. -Marek)

    We set IMAGE_CLAMP_BIT in the caller based on _ClampReadColor, where
    the operation mandates it.

    TODO: did I get the set of operations mandating it right?

commit 3a9cb5e59b676b6148c50907ce6eef5441677e36
Author: Luca Barbieri <[email protected]>
Date:   Thu Aug 26 18:09:41 2010 +0200

    mesa: respect color clamping in texenv programs (v2)

    Changes in v2:
    - Fix attributes other than vertex color sometimes getting clamped

commit de26f9e47e886e176aab6e5a2c3d4481efb64362
Author: Luca Barbieri <[email protected]>
Date:   Thu Aug 26 18:05:53 2010 +0200

    mesa: restore color clamps on glPopAttrib

commit a55ac3c300c189616627c05d924c40a8b55bfafa
Author: Luca Barbieri <[email protected]>
Date:   Thu Aug 26 18:04:26 2010 +0200

    mesa: clamp color queries if and only if fragment clamping is enabled

commit 9940a3e31c2fb76cc3d28b15ea78dde369825107
Author: Luca Barbieri <[email protected]>
Date:   Wed Aug 25 00:00:16 2010 +0200

    mesa: introduce derived _ClampXxxColor state resolving FIXED_ONLY

    To do this, we make ClampColor call FLUSH_VERTICES with the appropriate
    _NEW flag.

    We introduce _NEW_FRAG_CLAMP since fragment clamping has wide-ranging
    effects, despite being in the Color attrib group.

    This may be easily changed by s/_NEW_FRAG_CLAMP/_NEW_COLOR/g

commit 6244c446e3beed5473b4e811d10787e4019f59d6
Author: Luca Barbieri <[email protected]>
Date:   Thu Aug 26 17:58:24 2010 +0200

    mesa: add unclamped color parameters

1 files changed, 17 insertions, 4 deletions

diff --git a/src/mesa/main/texparam.c b/src/mesa/main/texparam.c
index 6e14face4dd..adb6bcebfab 100644
--- a/src/mesa/main/texparam.c
+++ b/src/mesa/main/texparam.c
@@ -38,6 +38,7 @@
 #include "main/macros.h"
 #include "main/mfeatures.h"
 #include "main/mtypes.h"
+#include "main/state.h"
 #include "main/texcompress.h"
 #include "main/texparam.h"
 #include "main/teximage.h"
@@ -1107,10 +1108,22 @@ _mesa_GetTexParameterfv( GLenum target, GLenum pname, GLfloat *params )
          *params = ENUM_TO_FLOAT(obj->WrapR);
          break;
       case GL_TEXTURE_BORDER_COLOR:
-         params[0] = CLAMP(obj->BorderColor.f[0], 0.0F, 1.0F);
-         params[1] = CLAMP(obj->BorderColor.f[1], 0.0F, 1.0F);
-         params[2] = CLAMP(obj->BorderColor.f[2], 0.0F, 1.0F);
-         params[3] = CLAMP(obj->BorderColor.f[3], 0.0F, 1.0F);
+         if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
+            _mesa_update_state_locked(ctx);
+         if(ctx->Color._ClampFragmentColor)
+         {
+            params[0] = CLAMP(obj->BorderColor.f[0], 0.0F, 1.0F);
+            params[1] = CLAMP(obj->BorderColor.f[1], 0.0F, 1.0F);
+            params[2] = CLAMP(obj->BorderColor.f[2], 0.0F, 1.0F);
+            params[3] = CLAMP(obj->BorderColor.f[3], 0.0F, 1.0F);
+         }
+         else
+         {
+            params[0] = obj->BorderColor.f[0];
+            params[1] = obj->BorderColor.f[1];
+            params[2] = obj->BorderColor.f[2];
+            params[3] = obj->BorderColor.f[3];
+         }
          break;
       case GL_TEXTURE_RESIDENT:
          {