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, 5 insertions, 0 deletions

diff --git a/src/mesa/main/fog.c b/src/mesa/main/fog.c
index 439232248e6..88aa31a7fcb 100644
--- a/src/mesa/main/fog.c
+++ b/src/mesa/main/fog.c
@@ -150,6 +150,10 @@ _mesa_Fogfv( GLenum pname, const GLfloat *params )
 	 if (TEST_EQ_4V(ctx->Fog.Color, params))
 	    return;
 	 FLUSH_VERTICES(ctx, _NEW_FOG);
+	 ctx->Fog.ColorUnclamped[0] = params[0];
+	 ctx->Fog.ColorUnclamped[1] = params[1];
+	 ctx->Fog.ColorUnclamped[2] = params[2];
+	 ctx->Fog.ColorUnclamped[3] = params[3];
 	 ctx->Fog.Color[0] = CLAMP(params[0], 0.0F, 1.0F);
 	 ctx->Fog.Color[1] = CLAMP(params[1], 0.0F, 1.0F);
 	 ctx->Fog.Color[2] = CLAMP(params[2], 0.0F, 1.0F);
@@ -189,6 +193,7 @@ void _mesa_init_fog( struct gl_context * ctx )
    ctx->Fog.Enabled = GL_FALSE;
    ctx->Fog.Mode = GL_EXP;
    ASSIGN_4V( ctx->Fog.Color, 0.0, 0.0, 0.0, 0.0 );
+   ASSIGN_4V( ctx->Fog.ColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
    ctx->Fog.Index = 0.0;
    ctx->Fog.Density = 1.0;
    ctx->Fog.Start = 0.0;