/*
 * Copyright 2012 Red Hat 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 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 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: Ben Skeggs
 *
 */

#include "draw/draw_context.h"
#include "draw/draw_vertex.h"
#include "draw/draw_pipe.h"
#include "draw/draw_vbuf.h"
#include "draw/draw_private.h"

#include "nouveau/nv_object.xml.h"
#include "nv30-40_3d.xml.h"
#include "nv30_context.h"
#include "nv30_format.h"

struct nv30_render {
   struct vbuf_render base;
   struct nv30_context *nv30;

   struct pipe_transfer *transfer;
   struct pipe_resource *buffer;
   unsigned offset;
   unsigned length;

   struct vertex_info vertex_info;

   struct nouveau_heap *vertprog;
   uint32_t vtxprog[16][4];
   uint32_t vtxfmt[16];
   uint32_t vtxptr[16];
   uint32_t prim;
};

static INLINE struct nv30_render *
nv30_render(struct vbuf_render *render)
{
   return (struct nv30_render *)render;
}

static const struct vertex_info *
nv30_render_get_vertex_info(struct vbuf_render *render)
{
   return &nv30_render(render)->vertex_info;
}

static boolean
nv30_render_allocate_vertices(struct vbuf_render *render,
                              ushort vertex_size, ushort nr_vertices)
{
   struct nv30_render *r = nv30_render(render);
   struct nv30_context *nv30 = r->nv30;

   r->length = vertex_size * nr_vertices;

   if (r->offset + r->length >= render->max_vertex_buffer_bytes) {
      pipe_resource_reference(&r->buffer, NULL);
      r->buffer = pipe_buffer_create(&nv30->screen->base.base,
                                     PIPE_BIND_VERTEX_BUFFER, 0,
                                     render->max_vertex_buffer_bytes);
      if (!r->buffer)
         return FALSE;

      r->offset = 0;
   }

   return TRUE;
}

static void *
nv30_render_map_vertices(struct vbuf_render *render)
{
   struct nv30_render *r = nv30_render(render);
   char *map = pipe_buffer_map(&r->nv30->base.pipe, r->buffer,
                               PIPE_TRANSFER_WRITE |
                               PIPE_TRANSFER_UNSYNCHRONIZED, &r->transfer);
   return map + r->offset;
}

static void
nv30_render_unmap_vertices(struct vbuf_render *render,
                           ushort min_index, ushort max_index)
{
   struct nv30_render *r = nv30_render(render);
   pipe_buffer_unmap(&r->nv30->base.pipe, r->transfer);
}

static void
nv30_render_set_primitive(struct vbuf_render *render, unsigned prim)
{
   struct nv30_render *r = nv30_render(render);

   r->prim = nv30_prim_gl(prim);
}

static void
nv30_render_draw_elements(struct vbuf_render *render,
                          const ushort *indices, uint count)
{
   struct nv30_render *r = nv30_render(render);
   struct nv30_context *nv30 = r->nv30;
   struct nouveau_pushbuf *push = nv30->screen->base.pushbuf;
   unsigned i;

   BEGIN_NV04(push, NV30_3D(VTXBUF(0)), r->vertex_info.num_attribs);
   for (i = 0; i < r->vertex_info.num_attribs; i++) {
      PUSH_RESRC(push, NV30_3D(VTXBUF(i)), BUFCTX_VTXTMP,
                       nv04_resource(r->buffer), r->offset + r->vtxptr[i],
                       NOUVEAU_BO_LOW | NOUVEAU_BO_RD, 0, 0);
   }

   if (!nv30_state_validate(nv30, FALSE))
      return;

   BEGIN_NV04(push, NV30_3D(VERTEX_BEGIN_END), 1);
   PUSH_DATA (push, r->prim);

   if (count & 1) {
      BEGIN_NV04(push, NV30_3D(VB_ELEMENT_U32), 1);
      PUSH_DATA (push, *indices++);
   }

   count >>= 1;
   while (count) {
      unsigned npush = MIN2(count, NV04_PFIFO_MAX_PACKET_LEN);
      count -= npush;

      BEGIN_NI04(push, NV30_3D(VB_ELEMENT_U16), npush);
      while (npush--) {
         PUSH_DATA(push, (indices[1] << 16) | indices[0]);
         indices += 2;
      }
   }

   BEGIN_NV04(push, NV30_3D(VERTEX_BEGIN_END), 1);
   PUSH_DATA (push, NV30_3D_VERTEX_BEGIN_END_STOP);
   PUSH_RESET(push, BUFCTX_VTXTMP);
}

static void
nv30_render_draw_arrays(struct vbuf_render *render, unsigned start, uint nr)
{
   struct nv30_render *r = nv30_render(render);
   struct nv30_context *nv30 = r->nv30;
   struct nouveau_pushbuf *push = nv30->base.pushbuf;
   unsigned fn = nr >> 8, pn = nr & 0xff;
   unsigned ps = fn + (pn ? 1 : 0);
   unsigned i;

   BEGIN_NV04(push, NV30_3D(VTXBUF(0)), r->vertex_info.num_attribs);
   for (i = 0; i < r->vertex_info.num_attribs; i++) {
      PUSH_RESRC(push, NV30_3D(VTXBUF(i)), BUFCTX_VTXTMP,
                       nv04_resource(r->buffer), r->offset + r->vtxptr[i],
                       NOUVEAU_BO_LOW | NOUVEAU_BO_RD, 0, 0);
   }

   if (!nv30_state_validate(nv30, FALSE))
      return;

   BEGIN_NV04(push, NV30_3D(VERTEX_BEGIN_END), 1);
   PUSH_DATA (push, r->prim);

   BEGIN_NI04(push, NV30_3D(VB_VERTEX_BATCH), ps);
   while (fn--) {
      PUSH_DATA (push, 0xff000000 | start);
      start += 256;
   }

   if (pn)
      PUSH_DATA (push, ((pn - 1) << 24) | start);

   BEGIN_NV04(push, NV30_3D(VERTEX_BEGIN_END), 1);
   PUSH_DATA (push, NV30_3D_VERTEX_BEGIN_END_STOP);
   PUSH_RESET(push, BUFCTX_VTXTMP);
}

static void
nv30_render_release_vertices(struct vbuf_render *render)
{
   struct nv30_render *r = nv30_render(render);
   r->offset += r->length;
}

static const struct {
   unsigned emit;
   unsigned interp;
   unsigned vp30;
   unsigned vp40;
   unsigned ow40;
} vroute [] = {
   [TGSI_SEMANTIC_POSITION] = { EMIT_4F, INTERP_PERSPECTIVE, 0, 0, 0x00000000 },
   [TGSI_SEMANTIC_COLOR   ] = { EMIT_4F, INTERP_LINEAR     , 3, 1, 0x00000001 },
   [TGSI_SEMANTIC_BCOLOR  ] = { EMIT_4F, INTERP_LINEAR     , 1, 3, 0x00000004 },
   [TGSI_SEMANTIC_FOG     ] = { EMIT_4F, INTERP_PERSPECTIVE, 5, 5, 0x00000010 },
   [TGSI_SEMANTIC_PSIZE   ] = { EMIT_1F_PSIZE, INTERP_POS  , 6, 6, 0x00000020 },
   [TGSI_SEMANTIC_GENERIC ] = { EMIT_4F, INTERP_PERSPECTIVE, 8, 7, 0x00004000 }
};

static boolean
vroute_add(struct nv30_render *r, uint attrib, uint sem, uint *idx)
{
   struct pipe_screen *pscreen = &r->nv30->screen->base.base;
   struct nv30_fragprog *fp = r->nv30->fragprog.program;
   struct vertex_info *vinfo = &r->vertex_info;
   enum pipe_format format;
   uint emit = EMIT_OMIT;
   uint result = *idx;

   if (sem == TGSI_SEMANTIC_GENERIC && result >= 8) {
      for (result = 0; result < 8; result++) {
         if (fp->texcoord[result] == *idx) {
            emit = vroute[sem].emit;
            break;
         }
      }
   } else {
      emit = vroute[sem].emit;
   }

   if (emit == EMIT_OMIT)
      return FALSE;

   draw_emit_vertex_attr(vinfo, emit, vroute[sem].interp, attrib);
   format = draw_translate_vinfo_format(emit);

   r->vtxfmt[attrib] = nv30_vtxfmt(pscreen, format)->hw;
   r->vtxptr[attrib] = vinfo->size | NV30_3D_VTXBUF_DMA1;
   vinfo->size += draw_translate_vinfo_size(emit);

   if (nv30_screen(pscreen)->eng3d->oclass < NV40_3D_CLASS) {
      r->vtxprog[attrib][0] = 0x001f38d8;
      r->vtxprog[attrib][1] = 0x0080001b | (attrib << 9);
      r->vtxprog[attrib][2] = 0x0836106c;
      r->vtxprog[attrib][3] = 0x2000f800 | (result + vroute[sem].vp30) << 2;
   } else {
      r->vtxprog[attrib][0] = 0x401f9c6c;
      r->vtxprog[attrib][1] = 0x0040000d | (attrib << 8);
      r->vtxprog[attrib][2] = 0x8106c083;
      r->vtxprog[attrib][3] = 0x6041ff80 | (result + vroute[sem].vp40) << 2;
   }

   *idx = vroute[sem].ow40 << result;
   return TRUE;
}

static boolean
nv30_render_validate(struct nv30_context *nv30)
{
   struct nv30_render *r = nv30_render(nv30->draw->render);
   struct nv30_rasterizer_stateobj *rast = nv30->rast;
   struct pipe_screen *pscreen = &nv30->screen->base.base;
   struct nouveau_pushbuf *push = nv30->screen->base.pushbuf;
   struct nouveau_object *eng3d = nv30->screen->eng3d;
   struct nv30_vertprog *vp = nv30->vertprog.program;
   struct vertex_info *vinfo = &r->vertex_info;
   unsigned vp_attribs = 0;
   unsigned vp_results = 0;
   unsigned attrib = 0;
   unsigned pntc;
   int i;

   if (!r->vertprog) {
      struct nouveau_heap *heap = nv30_screen(pscreen)->vp_exec_heap;
      if (nouveau_heap_alloc(heap, 16, &r->vertprog, &r->vertprog)) {
         while (heap->next && heap->size < 16) {
            struct nouveau_heap **evict = heap->next->priv;
            nouveau_heap_free(evict);
         }

         if (nouveau_heap_alloc(heap, 16, &r->vertprog, &r->vertprog))
            return FALSE;
      }
   }

   vinfo->num_attribs = 0;
   vinfo->size = 0;

   /* setup routing for all necessary vp outputs */
   for (i = 0; i < vp->info.num_outputs && attrib < 16; i++) {
      uint semantic = vp->info.output_semantic_name[i];
      uint index = vp->info.output_semantic_index[i];
      if (vroute_add(r, attrib, semantic, &index)) {
         vp_attribs |= (1 << attrib++);
         vp_results |= index;
      }
   }

   /* setup routing for replaced point coords not written by vp */
   if (rast && rast->pipe.point_quad_rasterization)
      pntc = rast->pipe.sprite_coord_enable & 0x000002ff;
   else
      pntc = 0;

   while (pntc && attrib < 16) {
      uint index = ffs(pntc) - 1; pntc &= ~(1 << index);
      if (vroute_add(r, attrib, TGSI_SEMANTIC_GENERIC, &index)) {
         vp_attribs |= (1 << attrib++);
         vp_results |= index;
      }
   }

   /* modify vertex format for correct stride, and stub out unused ones */
   BEGIN_NV04(push, NV30_3D(VP_UPLOAD_FROM_ID), 1);
   PUSH_DATA (push, r->vertprog->start);
   r->vtxprog[attrib - 1][3] |= 1;
   for (i = 0; i < attrib; i++) {
      BEGIN_NV04(push, NV30_3D(VP_UPLOAD_INST(0)), 4);
      PUSH_DATAp(push, r->vtxprog[i], 4);
      r->vtxfmt[i] |= vinfo->size << 8;
   }
   for (; i < 16; i++)
      r->vtxfmt[i]  = NV30_3D_VTXFMT_TYPE_V32_FLOAT;

   BEGIN_NV04(push, NV30_3D(VIEWPORT_TRANSLATE_X), 8);
   PUSH_DATAf(push, 0.0);
   PUSH_DATAf(push, 0.0);
   PUSH_DATAf(push, 0.0);
   PUSH_DATAf(push, 0.0);
   PUSH_DATAf(push, 1.0);
   PUSH_DATAf(push, 1.0);
   PUSH_DATAf(push, 1.0);
   PUSH_DATAf(push, 1.0);
   BEGIN_NV04(push, NV30_3D(DEPTH_RANGE_NEAR), 2);
   PUSH_DATAf(push, 0.0);
   PUSH_DATAf(push, 1.0);

   BEGIN_NV04(push, NV30_3D(VTXFMT(0)), 16);
   PUSH_DATAp(push, r->vtxfmt, 16);

   BEGIN_NV04(push, NV30_3D(VP_START_FROM_ID), 1);
   PUSH_DATA (push, r->vertprog->start);
   BEGIN_NV04(push, NV30_3D(ENGINE), 1);
   PUSH_DATA (push, 0x00000103);
   if (eng3d->oclass >= NV40_3D_CLASS) {
      BEGIN_NV04(push, NV40_3D(VP_ATTRIB_EN), 2);
      PUSH_DATA (push, vp_attribs);
      PUSH_DATA (push, vp_results);
   }

   vinfo->size /= 4;
   return TRUE;
}

void
nv30_render_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
{
   struct nv30_context *nv30 = nv30_context(pipe);
   struct draw_context *draw = nv30->draw;
   struct pipe_transfer *transfer[PIPE_MAX_ATTRIBS];
   struct pipe_transfer *transferi = NULL;
   int i;

   nv30_render_validate(nv30);

   if (nv30->draw_dirty & NV30_NEW_VIEWPORT)
      draw_set_viewport_state(draw, &nv30->viewport);
   if (nv30->draw_dirty & NV30_NEW_RASTERIZER)
      draw_set_rasterizer_state(draw, &nv30->rast->pipe, NULL);
   if (nv30->draw_dirty & NV30_NEW_CLIP)
      draw_set_clip_state(draw, &nv30->clip);
   if (nv30->draw_dirty & NV30_NEW_ARRAYS) {
      draw_set_vertex_buffers(draw, nv30->num_vtxbufs, nv30->vtxbuf);
      draw_set_vertex_elements(draw, nv30->vertex->num_elements, nv30->vertex->pipe);
   }
   if (nv30->draw_dirty & NV30_NEW_FRAGPROG) {
      struct nv30_fragprog *fp = nv30->fragprog.program;
      if (!fp->draw)
         fp->draw = draw_create_fragment_shader(draw, &fp->pipe);
      draw_bind_fragment_shader(draw, fp->draw);
   }
   if (nv30->draw_dirty & NV30_NEW_VERTPROG) {
      struct nv30_vertprog *vp = nv30->vertprog.program;
      if (!vp->draw)
         vp->draw = draw_create_vertex_shader(draw, &vp->pipe);
      draw_bind_vertex_shader(draw, vp->draw);
   }
   if (nv30->draw_dirty & NV30_NEW_VERTCONST) {
      if (nv30->vertprog.constbuf) {
         void *map = nv04_resource(nv30->vertprog.constbuf)->data;
         draw_set_mapped_constant_buffer(draw, PIPE_SHADER_VERTEX, 0,
                                         map, nv30->vertprog.constbuf_nr);
      }
   }

   for (i = 0; i < nv30->num_vtxbufs; i++) {
      void *map = pipe_buffer_map(pipe, nv30->vtxbuf[i].buffer,
                                  PIPE_TRANSFER_UNSYNCHRONIZED |
                                  PIPE_TRANSFER_READ, &transfer[i]);
      draw_set_mapped_vertex_buffer(draw, i, map);
   }

   if (info->indexed) {
      void *map = pipe_buffer_map(pipe, nv30->idxbuf.buffer,
                                  PIPE_TRANSFER_UNSYNCHRONIZED |
                                  PIPE_TRANSFER_READ, &transferi);
      draw_set_index_buffer(draw, &nv30->idxbuf);
      draw_set_mapped_index_buffer(draw, map);
   } else {
      draw_set_mapped_index_buffer(draw, NULL);
   }

   draw_vbo(draw, info);
   draw_flush(draw);

   if (info->indexed)
      pipe_buffer_unmap(pipe, transferi);
   for (i = 0; i < nv30->num_vtxbufs; i++)
      pipe_buffer_unmap(pipe, transfer[i]);

   nv30->draw_dirty = 0;
   nv30_state_release(nv30);
}

static void
nv30_render_destroy(struct vbuf_render *render)
{
   FREE(render);
}

static struct vbuf_render *
nv30_render_create(struct nv30_context *nv30)
{
   struct nv30_render *r = CALLOC_STRUCT(nv30_render);
   if (!r)
      return NULL;

   r->nv30 = nv30;
   r->offset = 1 * 1024 * 1024;

   r->base.max_indices = 16 * 1024;
   r->base.max_vertex_buffer_bytes = r->offset;

   r->base.get_vertex_info = nv30_render_get_vertex_info;
   r->base.allocate_vertices = nv30_render_allocate_vertices;
   r->base.map_vertices = nv30_render_map_vertices;
   r->base.unmap_vertices = nv30_render_unmap_vertices;
   r->base.set_primitive = nv30_render_set_primitive;
   r->base.draw_elements = nv30_render_draw_elements;
   r->base.draw_arrays = nv30_render_draw_arrays;
   r->base.release_vertices = nv30_render_release_vertices;
   r->base.destroy = nv30_render_destroy;
   return &r->base;
}

void
nv30_draw_init(struct pipe_context *pipe)
{
   struct nv30_context *nv30 = nv30_context(pipe);
   struct vbuf_render *render;
   struct draw_context *draw;
   struct draw_stage *stage;

   draw = draw_create(pipe);
   if (!draw)
      return;

   render = nv30_render_create(nv30);
   if (!render) {
      draw_destroy(draw);
      return;
   }

   stage = draw_vbuf_stage(draw, render);
   if (!stage) {
      render->destroy(render);
      draw_destroy(draw);
      return;
   }

   draw_set_render(draw, render);
   draw_set_rasterize_stage(draw, stage);
   draw_wide_line_threshold(draw, 10000000.f);
   draw_wide_point_threshold(draw, 10000000.f);
   draw_wide_point_sprites(draw, TRUE);
   nv30->draw = draw;
}