svga: return 1 for PIPE_CAP_VERTEX_COLOR_UNCLAMPED query

Before, we weren't clamping the vertex colors produced by ARB vertex
programs.  This could result in some rendering being too bright (in
ETQW, for example).

Also add cases for PIPE_CAP_VERTEX_COLOR_CLAMPED and
PIPE_CAP_FRAGMENT_COLOR_CLAMPED with comments to be complete.

Reviewed-by: José Fonseca <jfonseca@vmware.com>

diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 8badcb2a595296499f0e3b9c0af0c5956d839cd2..b2f3e33a6f0f70985f157ff06598c39beebed75d 100644 (file)
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -203,6 +203,13 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
       return 0;
 
+   case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
+      return 1; /* The color outputs of vertex shaders are not clamped */
+   case PIPE_CAP_VERTEX_COLOR_CLAMPED:
+      return 0; /* The driver can't clamp vertex colors */
+   case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
+      return 0; /* The driver can't clamp fragment colors */
+
    default:
       return 0;
    }