/*
 * Copyright © 2013 Rob Clark <robclark@freedesktop.org>
 * SPDX-License-Identifier: MIT
 *
 * Authors:
 *    Rob Clark <robclark@freedesktop.org>
 */

#include "pipe/p_state.h"
#include "util/format/u_format.h"
#include "util/u_memory.h"
#include "util/u_prim.h"
#include "util/u_string.h"

#include "freedreno_resource.h"
#include "freedreno_state.h"

#include "fd3_context.h"
#include "fd3_draw.h"
#include "fd3_emit.h"
#include "fd3_format.h"
#include "fd3_program.h"
#include "fd3_zsa.h"

static inline uint32_t
add_sat(uint32_t a, int32_t b)
{
   int64_t ret = (uint64_t)a + (int64_t)b;
   if (ret > ~0U)
      return ~0U;
   if (ret < 0)
      return 0;
   return (uint32_t)ret;
}

static void
draw_impl(struct fd_context *ctx, struct fd_ringbuffer *ring,
          struct fd3_emit *emit, unsigned index_offset) assert_dt
{
   const struct pipe_draw_info *info = emit->info;
   enum pc_di_primtype primtype = ctx->screen->primtypes[info->mode];

   fd3_emit_state(ctx, ring, emit);

   if (emit->dirty & (FD_DIRTY_VTXBUF | FD_DIRTY_VTXSTATE))
      fd3_emit_vertex_bufs(ring, emit);

   OUT_PKT0(ring, REG_A3XX_PC_VERTEX_REUSE_BLOCK_CNTL, 1);
   OUT_RING(ring, 0x0000000b); /* PC_VERTEX_REUSE_BLOCK_CNTL */

   OUT_PKT0(ring, REG_A3XX_VFD_INDEX_MIN, 4);
   OUT_RING(ring, info->index_bounds_valid
                     ? add_sat(info->min_index,
                               info->index_size ? emit->draw->index_bias : 0)
                     : 0); /* VFD_INDEX_MIN */
   OUT_RING(ring, info->index_bounds_valid
                     ? add_sat(info->max_index,
                               info->index_size ? emit->draw->index_bias : 0)
                     : ~0);              /* VFD_INDEX_MAX */
   OUT_RING(ring, info->start_instance); /* VFD_INSTANCEID_OFFSET */
   OUT_RING(ring, info->index_size ? emit->draw->index_bias
                                   : emit->draw->start); /* VFD_INDEX_OFFSET */

   OUT_PKT0(ring, REG_A3XX_PC_RESTART_INDEX, 1);
   OUT_RING(ring, info->primitive_restart ? /* PC_RESTART_INDEX */
                     info->restart_index
                                          : 0xffffffff);

   /* points + psize -> spritelist: */
   if (ctx->rasterizer->point_size_per_vertex &&
       fd3_emit_get_vp(emit)->writes_psize && (info->mode == MESA_PRIM_POINTS))
      primtype = DI_PT_POINTLIST_PSIZE;

   fd_draw_emit(ctx->batch, ring, primtype,
                emit->binning_pass ? IGNORE_VISIBILITY : USE_VISIBILITY, info,
                emit->draw, index_offset);
}

static bool
fd3_draw_vbo(struct fd_context *ctx, const struct pipe_draw_info *info,
             unsigned drawid_offset,
             const struct pipe_draw_indirect_info *indirect,
             const struct pipe_draw_start_count_bias *draw,
             unsigned index_offset) in_dt
{
   struct fd3_emit emit = {
      .debug = &ctx->debug,
      .vtx = &ctx->vtx,
      .info = info,
      .drawid_offset = drawid_offset,
      .indirect = indirect,
      .draw = draw,
      .key = {
         .vs = ctx->prog.vs,
         .fs = ctx->prog.fs,
      },
      .rasterflat = ctx->rasterizer->flatshade,
      .sprite_coord_enable = ctx->rasterizer->sprite_coord_enable,
      .sprite_coord_mode = ctx->rasterizer->sprite_coord_mode,
   };

   if (info->mode != MESA_PRIM_COUNT && !indirect && !info->primitive_restart &&
       !u_trim_pipe_prim(info->mode, (unsigned *)&draw->count))
      return false;

   if (fd3_needs_manual_clipping(ir3_get_shader(ctx->prog.vs), ctx->rasterizer))
      emit.key.key.ucp_enables = ctx->rasterizer->clip_plane_enable;

   ir3_fixup_shader_state(&ctx->base, &emit.key.key);

   unsigned dirty = ctx->dirty;

   emit.prog = fd3_program_state(
      ir3_cache_lookup(ctx->shader_cache, &emit.key, &ctx->debug));

   /* bail if compile failed: */
   if (!emit.prog)
      return false;

   fd_blend_tracking(ctx);

   const struct ir3_shader_variant *vp = fd3_emit_get_vp(&emit);
   const struct ir3_shader_variant *fp = fd3_emit_get_fp(&emit);

   ir3_update_max_tf_vtx(ctx, vp);

   /* do regular pass first: */

   if (unlikely(ctx->stats_users > 0)) {
      ctx->stats.vs_regs += ir3_shader_halfregs(vp);
      ctx->stats.fs_regs += ir3_shader_halfregs(fp);
   }

   emit.binning_pass = false;
   emit.dirty = dirty;
   draw_impl(ctx, ctx->batch->draw, &emit, index_offset);

   /* and now binning pass: */
   emit.binning_pass = true;
   emit.dirty = dirty & ~(FD_DIRTY_BLEND);
   emit.vs = NULL; /* we changed key so need to refetch vs */
   emit.fs = NULL;
   draw_impl(ctx, ctx->batch->binning, &emit, index_offset);

   fd_context_all_clean(ctx);

   ctx->batch->num_vertices += draw->count * info->instance_count;

   return true;
}

static void
fd3_draw_vbos(struct fd_context *ctx, const struct pipe_draw_info *info,
              unsigned drawid_offset,
              const struct pipe_draw_indirect_info *indirect,
              const struct pipe_draw_start_count_bias *draws,
              unsigned num_draws,
              unsigned index_offset)
   assert_dt
{
   for (unsigned i = 0; i < num_draws; i++)
      fd3_draw_vbo(ctx, info, drawid_offset, indirect, &draws[i], index_offset);
}

void
fd3_draw_init(struct pipe_context *pctx) disable_thread_safety_analysis
{
   struct fd_context *ctx = fd_context(pctx);
   ctx->draw_vbos = fd3_draw_vbos;
}