1 files changed, 165 insertions, 0 deletions
diff --git a/src/gallium/drivers/i965/brw_wm_constant_buffer.c b/src/gallium/drivers/i965/brw_wm_constant_buffer.c
new file mode 100644
index 0000000000..6434c6acf7
--- /dev/null
+++ b/src/gallium/drivers/i965/brw_wm_constant_buffer.c
@@ -0,0 +1,165 @@
+/* XXX: Constant buffers disabled
+ */
+
+
+/**
+ * Create the constant buffer surface.  Vertex/fragment shader constants will be
+ * read from this buffer with Data Port Read instructions/messages.
+ */
+enum pipe_error
+brw_create_constant_surface( struct brw_context *brw,
+                             struct brw_surface_key *key,
+                             struct brw_winsys_buffer **bo_out )
+{
+   const GLint w = key->width - 1;
+   struct brw_winsys_buffer *bo;
+   struct brw_winsys_reloc reloc[1];
+   enum pipe_error ret;
+
+      /* Emit relocation to surface contents */
+   make_reloc(&reloc[0],
+              BRW_USAGE_SAMPLER,
+              0,
+              offsetof(struct brw_surface_state, ss1),
+              key->bo);
+
+   
+   memset(&surf, 0, sizeof(surf));
+
+   surf.ss0.mipmap_layout_mode = BRW_SURFACE_MIPMAPLAYOUT_BELOW;
+   surf.ss0.surface_type = BRW_SURFACE_BUFFER;
+   surf.ss0.surface_format = BRW_SURFACEFORMAT_R32G32B32A32_FLOAT;
+
+   surf.ss1.base_addr = 0; /* reloc */
+
+   surf.ss2.width = w & 0x7f;            /* bits 6:0 of size or width */
+   surf.ss2.height = (w >> 7) & 0x1fff;  /* bits 19:7 of size or width */
+   surf.ss3.depth = (w >> 20) & 0x7f;    /* bits 26:20 of size or width */
+   surf.ss3.pitch = (key->pitch * key->cpp) - 1; /* ignored?? */
+   brw_set_surface_tiling(&surf, key->tiling); /* tiling now allowed */
+ 
+   ret = brw_upload_cache(&brw->surface_cache, BRW_SS_SURFACE,
+                          key, sizeof(*key),
+                          reloc, Elements(reloc),
+                          &surf, sizeof(surf),
+                          NULL, NULL,
+                          &bo_out);
+   if (ret)
+      return ret;
+
+   return PIPE_OK;
+}
+
+
+
+/**
+ * Update the surface state for a WM constant buffer.
+ * The constant buffer will be (re)allocated here if needed.
+ */
+static enum pipe_error
+brw_update_wm_constant_surface( struct brw_context *brw,
+                                GLuint surf)
+{
+   struct brw_surface_key key;
+   struct brw_fragment_shader *fp = brw->curr.fragment_shader;
+   struct pipe_buffer *cbuf = brw->curr.fragment_constants;
+   int pitch = cbuf->size / (4 * sizeof(float));
+   enum pipe_error ret;
+
+   /* If we're in this state update atom, we need to update WM constants, so
+    * free the old buffer and create a new one for the new contents.
+    */
+   ret = brw_wm_update_constant_buffer(brw, &fp->const_buffer);
+   if (ret)
+      return ret;
+
+   /* If there's no constant buffer, then no surface BO is needed to point at
+    * it.
+    */
+   if (cbuf == NULL) {
+      bo_reference(&brw->wm.surf_bo[surf], NULL);
+      return PIPE_OK;
+   }
+
+   memset(&key, 0, sizeof(key));
+
+   key.ss0.mipmap_layout_mode = BRW_SURFACE_MIPMAPLAYOUT_BELOW;
+   key.ss0.surface_type = BRW_SURFACE_BUFFER;
+   key.ss0.surface_format = BRW_SURFACEFORMAT_R32G32B32A32_FLOAT;
+
+   key.bo = brw_buffer(cbuf)->bo;
+
+   key.ss2.width = (pitch-1) & 0x7f;            /* bits 6:0 of size or width */
+   key.ss2.height = ((pitch-1) >> 7) & 0x1fff;  /* bits 19:7 of size or width */
+   key.ss3.depth = ((pitch-1) >> 20) & 0x7f;    /* bits 26:20 of size or width */
+   key.ss3.pitch = (pitch * 4 * sizeof(float)) - 1; /* ignored?? */
+   brw_set_surface_tiling(&surf, key->tiling); /* tiling now allowed */
+
+
+   /*
+   printf("%s:\n", __FUNCTION__);
+   printf("  width %d  height %d  depth %d  cpp %d  pitch %d\n",
+          key.width, key.height, key.depth, key.cpp, key.pitch);
+   */
+
+   if (brw_search_cache(&brw->surface_cache,
+                        BRW_SS_SURFACE,
+                        &key, sizeof(key),
+                        &key.bo, 1,
+                        NULL,
+                        &brw->wm.surf_bo[surf]))
+      return PIPE_OK;
+
+   ret = brw_create_constant_surface(brw, &key, &brw->wm.surf_bo[surf]);
+   if (ret)
+      return ret;
+
+   brw->state.dirty.brw |= BRW_NEW_WM_SURFACES;
+   return PIPE_OK;
+}
+
+/**
+ * Updates surface / buffer for fragment shader constant buffer, if
+ * one is required.
+ *
+ * This consumes the state updates for the constant buffer, and produces
+ * BRW_NEW_WM_SURFACES to get picked up by brw_prepare_wm_surfaces for
+ * inclusion in the binding table.
+ */
+static enum pipe_error prepare_wm_constant_surface(struct brw_context *brw )
+{
+   struct brw_fragment_program *fp =
+      (struct brw_fragment_program *) brw->fragment_program;
+   GLuint surf = SURF_INDEX_FRAG_CONST_BUFFER;
+
+   ret = brw_wm_update_constant_buffer(brw,
+                                       &fp->const_buffer);
+   if (ret)
+      return ret;
+
+   /* If there's no constant buffer, then no surface BO is needed to point at
+    * it.
+    */
+   if (fp->const_buffer == 0) {
+      if (brw->wm.surf_bo[surf] != NULL) {
+	 bo_reference(&brw->wm.surf_bo[surf], NULL);
+	 brw->state.dirty.brw |= BRW_NEW_WM_SURFACES;
+      }
+      return PIPE_OK;
+   }
+
+   ret = brw_update_wm_constant_surface(ctx, surf);
+   if (ret)
+      return ret;
+
+   return PIPE_OK
+}
+
+const struct brw_tracked_state brw_wm_constant_surface = {
+   .dirty = {
+      .mesa = (_NEW_PROGRAM_CONSTANTS),
+      .brw = (BRW_NEW_FRAGMENT_PROGRAM),
+      .cache = 0
+   },
+   .prepare = prepare_wm_constant_surface,
+};