i965: code to setup a constant buffer sampler

This code won't actually be used and will be removed in a subsequent commit.
Just committing for posterity.

diff --git a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
index 68a9296..e13eb28 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c
@@ -217,6 +217,45 @@ static void brw_update_sampler_state(struct wm_sampler_entry *key,
    sampler->ss2.default_color_pointer = sdc_bo->offset >> 5; /* reloc */
 }
 
+
+#if 0
+/**
+ * Setup the sampler state for the "constant buffer texture".
+ * The constant buffer texture is basically a 1D float[4] texture whose
+ * width == the number of program parameters/constants.
+ */
+static void
+brwm_wm_setup_constant_sampler(struct brw_context *brw,
+                               struct wm_sampler_key *key)
+{
+   static const GLfloat black[4] = {0.0F, 0.0F, 0.0F, 0.0F};
+   const GLuint unit = BRW_MAX_TEX_UNIT - 1;
+   struct wm_sampler_entry *entry = &key->sampler[unit];
+
+   entry->tex_target = GL_TEXTURE_1D;
+
+   entry->wrap_r = GL_CLAMP_TO_EDGE;
+   entry->wrap_s = GL_CLAMP_TO_EDGE;
+   entry->wrap_t = GL_CLAMP_TO_EDGE;
+
+   entry->maxlod = 0.0F;
+   entry->minlod = 0.0F;
+   entry->lod_bias = 0.0F;
+   entry->max_aniso = 0.0F;
+   entry->minfilter = GL_NEAREST;
+   entry->magfilter = GL_NEAREST;
+   entry->comparemode = GL_NONE;
+   entry->comparefunc = GL_ALWAYS;
+
+   dri_bo_unreference(brw->wm.sdc_bo[unit]);
+
+   brw->wm.sdc_bo[unit] = upload_default_color(brw, black);
+
+   key->sampler_count = unit + 1;
+}
+#endif
+
+
 /** Sets up the cache key for sampler state for all texture units */
 static void
 brw_wm_sampler_populate_key(struct brw_context *brw,
@@ -271,6 +310,10 @@ brw_wm_sampler_populate_key(struct brw_context *brw,
         key->sampler_count = unit + 1;
       }
    }
+
+#if 0
+   brwm_wm_setup_constant_sampler(brw, key);
+#endif
 }
 
 /* All samplers must be uploaded in a single contiguous array, which