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, 39 insertions, 1 deletions

diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 118ed1d284a..1d1ae47374e 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -445,6 +445,35 @@ update_color(struct gl_context *ctx)
    ctx->Color._LogicOpEnabled = _mesa_rgba_logicop_enabled(ctx);
 }
 
+static void
+update_clamp_fragment_color(struct gl_context *ctx)
+{
+   if(ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
+      ctx->Color._ClampFragmentColor = !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
+   else
+      ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
+}
+
+static void
+update_clamp_vertex_color(struct gl_context *ctx)
+{
+   if(ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
+      ctx->Light._ClampVertexColor = !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
+   else
+      ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
+}
+
+static void
+update_clamp_read_color(struct gl_context *ctx)
+{
+   if(ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
+      ctx->Color._ClampReadColor = !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
+   else
+      ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
+}
+
+
+
 
 /*
  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
@@ -565,7 +594,7 @@ _mesa_update_state_locked( struct gl_context *ctx )
    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 		     _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
-		     _NEW_PROGRAM);
+		     _NEW_PROGRAM | _NEW_FRAG_CLAMP);
    }
    if (ctx->VertexProgram._MaintainTnlProgram) {
       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
@@ -599,6 +628,9 @@ _mesa_update_state_locked( struct gl_context *ctx )
    if (new_state & _NEW_LIGHT)
       _mesa_update_lighting( ctx );
 
+   if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
+      update_clamp_vertex_color(ctx);
+
    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
       _mesa_update_stencil( ctx );
 
@@ -617,6 +649,12 @@ _mesa_update_state_locked( struct gl_context *ctx )
    if (new_state & _NEW_COLOR)
       update_color( ctx );
 
+   if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
+      update_clamp_read_color(ctx);
+
+   if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
+      update_clamp_fragment_color(ctx);
+
 #if 0
    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))