/*
 * Copyright (C) 2016 Rob Clark <robclark@freedesktop.org>
 * Copyright © 2018 Google, Inc.
 *
 * 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.
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "pipe/p_state.h"
#include "util/u_memory.h"
#include "util/u_string.h"

#include "fd6_context.h"
#include "fd6_format.h"
#include "fd6_pack.h"
#include "fd6_rasterizer.h"

struct fd_ringbuffer *
__fd6_setup_rasterizer_stateobj(struct fd_context *ctx,
                                const struct pipe_rasterizer_state *cso,
                                bool primitive_restart)
{
   struct fd_ringbuffer *ring = fd_ringbuffer_new_object(ctx->pipe, 26 * 4);
   float psize_min, psize_max;

   if (cso->point_size_per_vertex) {
      psize_min = util_get_min_point_size(cso);
      psize_max = 4092;
   } else {
      /* Force the point size to be as if the vertex output was disabled. */
      psize_min = cso->point_size;
      psize_max = cso->point_size;
   }

   OUT_REG(ring, A6XX_GRAS_CL_CNTL(.znear_clip_disable = !cso->depth_clip_near,
                                   .zfar_clip_disable = !cso->depth_clip_far,
                                   .unk5 = !cso->depth_clip_near ||
                                           !cso->depth_clip_far,
                                   .vp_clip_code_ignore = 1,
                                   .zero_gb_scale_z = cso->clip_halfz));

   OUT_REG(ring,
           A6XX_GRAS_SU_CNTL(.linehalfwidth = cso->line_width / 2.0,
                             .poly_offset = cso->offset_tri,
                             .line_mode = cso->multisample ? RECTANGULAR : BRESENHAM,
                             .cull_front = cso->cull_face & PIPE_FACE_FRONT,
                             .cull_back = cso->cull_face & PIPE_FACE_BACK,
                             .front_cw = !cso->front_ccw, ));

   OUT_REG(ring,
           A6XX_GRAS_SU_POINT_MINMAX(.min = psize_min, .max = psize_max, ),
           A6XX_GRAS_SU_POINT_SIZE(cso->point_size));

   OUT_REG(ring, A6XX_GRAS_SU_POLY_OFFSET_SCALE(cso->offset_scale),
           A6XX_GRAS_SU_POLY_OFFSET_OFFSET(cso->offset_units),
           A6XX_GRAS_SU_POLY_OFFSET_OFFSET_CLAMP(cso->offset_clamp));

   OUT_REG(ring,
           A6XX_PC_PRIMITIVE_CNTL_0(.provoking_vtx_last = !cso->flatshade_first,
                                    .primitive_restart = primitive_restart, ));

   enum a6xx_polygon_mode mode = POLYMODE6_TRIANGLES;
   switch (cso->fill_front) {
   case PIPE_POLYGON_MODE_POINT:
      mode = POLYMODE6_POINTS;
      break;
   case PIPE_POLYGON_MODE_LINE:
      mode = POLYMODE6_LINES;
      break;
   default:
      assert(cso->fill_front == PIPE_POLYGON_MODE_FILL);
      break;
   }

   OUT_REG(ring, A6XX_VPC_POLYGON_MODE(mode));
   OUT_REG(ring, A6XX_PC_POLYGON_MODE(mode));

   if (ctx->screen->info->a6xx.has_shading_rate) {
      OUT_REG(ring, A6XX_RB_UNKNOWN_8A00());
      OUT_REG(ring, A6XX_RB_UNKNOWN_8A10());
      OUT_REG(ring, A6XX_RB_UNKNOWN_8A20());
      OUT_REG(ring, A6XX_RB_UNKNOWN_8A30());
   }

   return ring;
}

void *
fd6_rasterizer_state_create(struct pipe_context *pctx,
                            const struct pipe_rasterizer_state *cso)
{
   struct fd6_rasterizer_stateobj *so;

   so = CALLOC_STRUCT(fd6_rasterizer_stateobj);
   if (!so)
      return NULL;

   so->base = *cso;

   return so;
}

void
fd6_rasterizer_state_delete(struct pipe_context *pctx, void *hwcso)
{
   struct fd6_rasterizer_stateobj *so = hwcso;

   for (unsigned i = 0; i < ARRAY_SIZE(so->stateobjs); i++)
      if (so->stateobjs[i])
         fd_ringbuffer_del(so->stateobjs[i]);

   FREE(hwcso);
}
