--- /dev/null
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * @file brw_vue_map.c
+ *
+ * Authors:
+ * Paul Berry <stereotype441@gmail.com>
+ * Chris Forbes <chrisf@ijw.co.nz>
+ * Eric Anholt <eric@anholt.net>
+ */
+
+
+#include "main/compiler.h"
+#include "brw_context.h"
+
+static inline void
+assign_vue_slot(struct brw_vue_map *vue_map, int varying)
+{
+ /* Make sure this varying hasn't been assigned a slot already */
+ assert (vue_map->varying_to_slot[varying] == -1);
+
+ vue_map->varying_to_slot[varying] = vue_map->num_slots;
+ vue_map->slot_to_varying[vue_map->num_slots++] = varying;
+}
+
+/**
+ * Compute the VUE map for vertex shader program.
+ */
+void
+brw_compute_vue_map(const struct brw_device_info *devinfo,
+ struct brw_vue_map *vue_map,
+ GLbitfield64 slots_valid)
+{
+ vue_map->slots_valid = slots_valid;
+ int i;
+
+ /* gl_Layer and gl_ViewportIndex don't get their own varying slots -- they
+ * are stored in the first VUE slot (VARYING_SLOT_PSIZ).
+ */
+ slots_valid &= ~(VARYING_BIT_LAYER | VARYING_BIT_VIEWPORT);
+
+ /* Make sure that the values we store in vue_map->varying_to_slot and
+ * vue_map->slot_to_varying won't overflow the signed chars that are used
+ * to store them. Note that since vue_map->slot_to_varying sometimes holds
+ * values equal to BRW_VARYING_SLOT_COUNT, we need to ensure that
+ * BRW_VARYING_SLOT_COUNT is <= 127, not 128.
+ */
+ STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 127);
+
+ vue_map->num_slots = 0;
+ for (i = 0; i < BRW_VARYING_SLOT_COUNT; ++i) {
+ vue_map->varying_to_slot[i] = -1;
+ vue_map->slot_to_varying[i] = BRW_VARYING_SLOT_COUNT;
+ }
+
+ /* VUE header: format depends on chip generation and whether clipping is
+ * enabled.
+ */
+ if (devinfo->gen < 6) {
+ /* There are 8 dwords in VUE header pre-Ironlake:
+ * dword 0-3 is indices, point width, clip flags.
+ * dword 4-7 is ndc position
+ * dword 8-11 is the first vertex data.
+ *
+ * On Ironlake the VUE header is nominally 20 dwords, but the hardware
+ * will accept the same header layout as Gen4 [and should be a bit faster]
+ */
+ assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
+ assign_vue_slot(vue_map, BRW_VARYING_SLOT_NDC);
+ assign_vue_slot(vue_map, VARYING_SLOT_POS);
+ } else {
+ /* There are 8 or 16 DWs (D0-D15) in VUE header on Sandybridge:
+ * dword 0-3 of the header is indices, point width, clip flags.
+ * dword 4-7 is the 4D space position
+ * dword 8-15 of the vertex header is the user clip distance if
+ * enabled.
+ * dword 8-11 or 16-19 is the first vertex element data we fill.
+ */
+ assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
+ assign_vue_slot(vue_map, VARYING_SLOT_POS);
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST0))
+ assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST0);
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_CLIP_DIST1))
+ assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST1);
+
+ /* front and back colors need to be consecutive so that we can use
+ * ATTRIBUTE_SWIZZLE_INPUTATTR_FACING to swizzle them when doing
+ * two-sided color.
+ */
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_COL0))
+ assign_vue_slot(vue_map, VARYING_SLOT_COL0);
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_BFC0))
+ assign_vue_slot(vue_map, VARYING_SLOT_BFC0);
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_COL1))
+ assign_vue_slot(vue_map, VARYING_SLOT_COL1);
+ if (slots_valid & BITFIELD64_BIT(VARYING_SLOT_BFC1))
+ assign_vue_slot(vue_map, VARYING_SLOT_BFC1);
+ }
+
+ /* The hardware doesn't care about the rest of the vertex outputs, so just
+ * assign them contiguously. Don't reassign outputs that already have a
+ * slot.
+ *
+ * We generally don't need to assign a slot for VARYING_SLOT_CLIP_VERTEX,
+ * since it's encoded as the clip distances by emit_clip_distances().
+ * However, it may be output by transform feedback, and we'd rather not
+ * recompute state when TF changes, so we just always include it.
+ */
+ for (int i = 0; i < VARYING_SLOT_MAX; ++i) {
+ if ((slots_valid & BITFIELD64_BIT(i)) &&
+ vue_map->varying_to_slot[i] == -1) {
+ assign_vue_slot(vue_map, i);
+ }
+ }
+}
projects / mesa.git / blobdiff