/*
 * 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.
 */

#include "compiler/nir/nir.h"
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "brw_util.h"
#include "main/macros.h"
#include "main/fbobject.h"
#include "intel_batchbuffer.h"

static void
upload_sbe(struct brw_context *brw)
{
   struct gl_context *ctx = &brw->ctx;
   /* BRW_NEW_FS_PROG_DATA */
   const struct brw_wm_prog_data *wm_prog_data =
      brw_wm_prog_data(brw->wm.base.prog_data);
   uint32_t num_outputs = wm_prog_data->num_varying_inputs;
   uint16_t attr_overrides[VARYING_SLOT_MAX];
   uint32_t urb_entry_read_length;
   uint32_t urb_entry_read_offset;
   uint32_t point_sprite_enables;
   int sbe_cmd_length;

   uint32_t dw1 =
      GEN7_SBE_SWIZZLE_ENABLE |
      num_outputs << GEN7_SBE_NUM_OUTPUTS_SHIFT;
   uint32_t dw4 = 0;
   uint32_t dw5 = 0;

   /* _NEW_BUFFERS */
   bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);

   /* _NEW_POINT
    *
    * Window coordinates in an FBO are inverted, which means point
    * sprite origin must be inverted.
    */
   if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo)
      dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
   else
      dw1 |= GEN6_SF_POINT_SPRITE_UPPERLEFT;

   /* _NEW_POINT | _NEW_LIGHT | _NEW_PROGRAM,
    * BRW_NEW_FS_PROG_DATA | BRW_NEW_FRAGMENT_PROGRAM |
    * BRW_NEW_GS_PROG_DATA | BRW_NEW_PRIMITIVE | BRW_NEW_TES_PROG_DATA |
    * BRW_NEW_VUE_MAP_GEOM_OUT
    */
   calculate_attr_overrides(brw, attr_overrides,
                            &point_sprite_enables,
                            &urb_entry_read_length,
                            &urb_entry_read_offset);

   /* Typically, the URB entry read length and offset should be programmed in
    * 3DSTATE_VS and 3DSTATE_GS; SBE inherits it from the last active stage
    * which produces geometry.  However, we don't know the proper value until
    * we call calculate_attr_overrides().
    *
    * To fit with our existing code, we override the inherited values and
    * specify it here directly, as we did on previous generations.
    */
   dw1 |=
      urb_entry_read_length << GEN7_SBE_URB_ENTRY_READ_LENGTH_SHIFT |
      urb_entry_read_offset << GEN8_SBE_URB_ENTRY_READ_OFFSET_SHIFT |
      GEN8_SBE_FORCE_URB_ENTRY_READ_LENGTH |
      GEN8_SBE_FORCE_URB_ENTRY_READ_OFFSET;

   if (brw->gen == 8) {
      sbe_cmd_length = 4;
   } else {
      sbe_cmd_length = 6;

      /* prepare the active component dwords */
      int input_index = 0;
      for (int attr = 0; attr < VARYING_SLOT_MAX; attr++) {
         if (!(brw->fragment_program->info.inputs_read &
               BITFIELD64_BIT(attr))) {
            continue;
         }

         assert(input_index < 32);

         if (input_index < 16)
            dw4 |= (GEN9_SBE_ACTIVE_COMPONENT_XYZW << (input_index << 1));
         else
            dw5 |= (GEN9_SBE_ACTIVE_COMPONENT_XYZW << ((input_index - 16) << 1));

         ++input_index;
      }
   }
   BEGIN_BATCH(sbe_cmd_length);
   OUT_BATCH(_3DSTATE_SBE << 16 | (sbe_cmd_length - 2));
   OUT_BATCH(dw1);
   OUT_BATCH(point_sprite_enables);
   OUT_BATCH(wm_prog_data->flat_inputs);
   if (sbe_cmd_length >= 6) {
      OUT_BATCH(dw4);
      OUT_BATCH(dw5);
   }
   ADVANCE_BATCH();

   BEGIN_BATCH(11);
   OUT_BATCH(_3DSTATE_SBE_SWIZ << 16 | (11 - 2));

   /* Output DWords 1 through 8: */
   for (int i = 0; i < 8; i++) {
      OUT_BATCH(attr_overrides[i * 2] | attr_overrides[i * 2 + 1] << 16);
   }

   OUT_BATCH(0); /* wrapshortest enables 0-7 */
   OUT_BATCH(0); /* wrapshortest enables 8-15 */
   ADVANCE_BATCH();
}

const struct brw_tracked_state gen8_sbe_state = {
   .dirty = {
      .mesa  = _NEW_BUFFERS |
               _NEW_LIGHT |
               _NEW_POINT |
               _NEW_POLYGON |
               _NEW_PROGRAM,
      .brw   = BRW_NEW_BLORP |
               BRW_NEW_CONTEXT |
               BRW_NEW_FRAGMENT_PROGRAM |
               BRW_NEW_FS_PROG_DATA |
               BRW_NEW_GS_PROG_DATA |
               BRW_NEW_TES_PROG_DATA |
               BRW_NEW_VUE_MAP_GEOM_OUT,
   },
   .emit = upload_sbe,
};