/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 "util/u_memory.h"

#include "lp_state.h"
#include "lp_rast.h"
#include "lp_rast_priv.h"
#include "lp_tile_soa.h"
#include "lp_bld_debug.h"

#define RAST_DEBUG debug_printf

struct lp_rasterizer *lp_rast_create( struct pipe_screen *screen )
{
   struct lp_rasterizer *rast;

   rast = CALLOC_STRUCT(lp_rasterizer);
   if(!rast)
      return NULL;

   rast->screen = screen;
   rast->tile.color = align_malloc( TILE_SIZE*TILE_SIZE*4, 16 );
   rast->tile.depth = align_malloc( TILE_SIZE*TILE_SIZE*4, 16 );

   return rast;
}


boolean lp_rast_begin( struct lp_rasterizer *rast,
                       struct pipe_surface *cbuf,
                       struct pipe_surface *zsbuf,
                       boolean write_color,
                       boolean write_zstencil,
                       unsigned width,
                       unsigned height )
{
   struct pipe_screen *screen = rast->screen;

   RAST_DEBUG("%s %dx%d\n", __FUNCTION__, width, height);

   pipe_surface_reference(&rast->state.cbuf, cbuf);
   pipe_surface_reference(&rast->state.zsbuf, zsbuf);

   rast->width = width;
   rast->height = height;
   rast->state.write_zstencil = write_zstencil;
   rast->state.write_color = write_color;

   rast->check_for_clipped_tiles = (width % TILESIZE != 0 ||
                                    height % TILESIZE != 0);

   if (cbuf) {
      rast->cbuf_transfer = screen->get_tex_transfer(rast->screen,
                                                     cbuf->texture,
                                                     cbuf->face,
                                                     cbuf->level,
                                                     cbuf->zslice,
                                                     PIPE_TRANSFER_READ_WRITE,
                                                     0, 0, width, height);
      if (!rast->cbuf_transfer)
         return FALSE;

      rast->cbuf_map = screen->transfer_map(rast->screen, 
                                            rast->cbuf_transfer);
      if (!rast->cbuf_map)
         return FALSE;
   }

   return TRUE;
}


void lp_rast_end( struct lp_rasterizer *rast )
{
   struct pipe_screen *screen = rast->screen;

   if (rast->cbuf_map) 
      screen->transfer_unmap(screen, rast->cbuf_transfer);

   if (rast->zsbuf_map) 
      screen->transfer_unmap(screen, rast->zsbuf_transfer);

   if (rast->cbuf_transfer)
      screen->tex_transfer_destroy(rast->cbuf_transfer);

   if (rast->zsbuf_transfer)
      screen->tex_transfer_destroy(rast->cbuf_transfer);

   rast->cbuf_transfer = NULL;
   rast->zsbuf_transfer = NULL;
   rast->cbuf_map = NULL;
   rast->zsbuf_map = NULL;
}




/* Begining of each tile:
 */
void lp_rast_start_tile( struct lp_rasterizer *rast,
			 unsigned x,
			 unsigned y )
{
   RAST_DEBUG("%s %d,%d\n", __FUNCTION__, x, y);

   rast->x = x;
   rast->y = y;
}

void lp_rast_clear_color( struct lp_rasterizer *rast,
                          const union lp_rast_cmd_arg arg )
{
   const uint8_t *clear_color = arg.clear_color;
   
   RAST_DEBUG("%s %x,%x,%x,%x\n", __FUNCTION__, 
              clear_color[0],
              clear_color[1],
              clear_color[2],
              clear_color[3]);

   if (clear_color[0] == clear_color[1] &&
       clear_color[1] == clear_color[2] &&
       clear_color[2] == clear_color[3]) {
      memset(rast->tile.color, clear_color[0], TILE_SIZE * TILE_SIZE * 4);
   }
   else {
      unsigned x, y, chan;
      for (y = 0; y < TILE_SIZE; y++)
         for (x = 0; x < TILE_SIZE; x++)
            for (chan = 0; chan < 4; ++chan)
               TILE_PIXEL(rast->tile.color, x, y, chan) = clear_color[chan];
   }
}

void lp_rast_clear_zstencil( struct lp_rasterizer *rast,
                             const union lp_rast_cmd_arg arg)
{
   unsigned i, j;
   
   RAST_DEBUG("%s\n", __FUNCTION__);

   for (i = 0; i < TILE_SIZE; i++)
      for (j = 0; j < TILE_SIZE; j++)
	 rast->tile.depth[i*TILE_SIZE + j] = arg.clear_zstencil;
}


void lp_rast_load_color( struct lp_rasterizer *rast,
                         const union lp_rast_cmd_arg arg)
{
   RAST_DEBUG("%s\n", __FUNCTION__);

   /* call u_tile func to load colors from surface */
}

void lp_rast_load_zstencil( struct lp_rasterizer *rast,
                            const union lp_rast_cmd_arg arg )
{
   RAST_DEBUG("%s\n", __FUNCTION__);

   /* call u_tile func to load depth (and stencil?) from surface */
}

/* Within a tile:
 */

void lp_rast_shade_tile( struct lp_rasterizer *rast,
                         const union lp_rast_cmd_arg arg )
{
   const struct lp_rast_shader_inputs *inputs = arg.shade_tile;
   const unsigned mask = ~0;
   unsigned x, y;

   RAST_DEBUG("%s\n", __FUNCTION__);

   /* Use the existing preference for 4x4 (four quads) shading:
    */
   for (y = 0; y < TILE_SIZE; y += 4)
      for (x = 0; x < TILE_SIZE; x += 4)
         lp_rast_shade_quads( rast, inputs, rast->x + x, rast->y + y, mask);
}


void lp_rast_shade_quads( struct lp_rasterizer *rast,
                          const struct lp_rast_shader_inputs *inputs,
                          unsigned x, unsigned y,
                          unsigned mask)
{
#if 1
   const struct lp_rast_state *state = inputs->state;
   struct lp_rast_tile *tile = &rast->tile;
   void *color;
   void *depth;
   uint32_t ALIGN16_ATTRIB masks[2][2][2][2];
   unsigned ix, iy;

   /* Sanity checks */
   assert(x % TILE_VECTOR_WIDTH == 0);
   assert(y % TILE_VECTOR_HEIGHT == 0);

   /* mask: the rasterizer wants to treat pixels in 4x4 blocks, but
    * the pixel shader wants to swizzle them into 4 2x2 quads.
    * 
    * Additionally, the pixel shader wants masks as full dword ~0,
    * while the rasterizer wants to pack per-pixel bits tightly.
    */
#if 0
   unsigned qx, qy;
   for (qy = 0; qy < 2; ++qy)
      for (qx = 0; qx < 2; ++qx)
	 for (iy = 0; iy < 2; ++iy)
	    for (ix = 0; ix < 2; ++ix)
	       masks[qy][qx][iy][ix] = mask & (1 << (qy*8+iy*4+qx*2+ix)) ? ~0 : 0;
#else
   masks[0][0][0][0] = mask & (1 << (0*8+0*4+0*2+0)) ? ~0 : 0;
   masks[0][0][0][1] = mask & (1 << (0*8+0*4+0*2+1)) ? ~0 : 0;
   masks[0][0][1][0] = mask & (1 << (0*8+1*4+0*2+0)) ? ~0 : 0;
   masks[0][0][1][1] = mask & (1 << (0*8+1*4+0*2+1)) ? ~0 : 0;
   masks[0][1][0][0] = mask & (1 << (0*8+0*4+1*2+0)) ? ~0 : 0;
   masks[0][1][0][1] = mask & (1 << (0*8+0*4+1*2+1)) ? ~0 : 0;
   masks[0][1][1][0] = mask & (1 << (0*8+1*4+1*2+0)) ? ~0 : 0;
   masks[0][1][1][1] = mask & (1 << (0*8+1*4+1*2+1)) ? ~0 : 0;

   masks[1][0][0][0] = mask & (1 << (1*8+0*4+0*2+0)) ? ~0 : 0;
   masks[1][0][0][1] = mask & (1 << (1*8+0*4+0*2+1)) ? ~0 : 0;
   masks[1][0][1][0] = mask & (1 << (1*8+1*4+0*2+0)) ? ~0 : 0;
   masks[1][0][1][1] = mask & (1 << (1*8+1*4+0*2+1)) ? ~0 : 0;
   masks[1][1][0][0] = mask & (1 << (1*8+0*4+1*2+0)) ? ~0 : 0;
   masks[1][1][0][1] = mask & (1 << (1*8+0*4+1*2+1)) ? ~0 : 0;
   masks[1][1][1][0] = mask & (1 << (1*8+1*4+1*2+0)) ? ~0 : 0;
   masks[1][1][1][1] = mask & (1 << (1*8+1*4+1*2+1)) ? ~0 : 0;
#endif

   ix = x % TILE_SIZE;
   iy = y % TILE_SIZE;

   /* color buffer */
   color = &TILE_PIXEL(tile->color, ix, iy, 0);

   /* depth buffer */
   assert((x % 2) == 0);
   assert((y % 2) == 0);
   depth = tile->depth + iy*TILE_SIZE + 2*ix;

   /* XXX: This will most likely fail on 32bit x86 without -mstackrealign */
   assert(lp_check_alignment(masks, 16));

   assert(lp_check_alignment(depth, 16));
   assert(lp_check_alignment(color, 16));
   assert(lp_check_alignment(state->jit_context.blend_color, 16));

   /* run shader */
   state->jit_function( &state->jit_context,
                        x, y,
                        inputs->a0,
                        inputs->dadx,
                        inputs->dady,
                        &masks[0][0][0][0],
                        color,
                        depth);
#else
   struct lp_rast_tile *tile = &rast->tile;
   unsigned chan_index;
   unsigned q, ix, iy;

   x %= TILE_SIZE;
   y %= TILE_SIZE;

   /* mask */
   for (q = 0; q < 4; ++q)
      for(iy = 0; iy < 2; ++iy)
         for(ix = 0; ix < 2; ++ix)
            if(masks[q] & (1 << (iy*2 + ix)))
               for (chan_index = 0; chan_index < NUM_CHANNELS; ++chan_index)
                  TILE_PIXEL(tile->color, x + q*2 + ix, y + iy, chan_index) = 0xff;

#endif
}


/* End of tile:
 */


static void lp_rast_store_color( struct lp_rasterizer *rast )
{
   const unsigned x = rast->x;
   const unsigned y = rast->y;
   unsigned w = TILESIZE;
   unsigned h = TILESIZE;

   if (x + w > rast->width)
      w -= x + w - rast->width;

   if (y + h > rast->height)
      h -= y + h - rast->height;

   RAST_DEBUG("%s %d,%d %dx%d\n", __FUNCTION__, x, y, w, h);

   lp_tile_write_4ub(rast->cbuf_transfer->format,
                     rast->tile.color,
                     rast->cbuf_map, 
                     rast->cbuf_transfer->stride,
                     x, y,
                     w, h);
}


static void lp_rast_store_zstencil( struct lp_rasterizer *rast )
{
   RAST_DEBUG("%s\n", __FUNCTION__);

   /* FIXME: call u_tile func to store depth/stencil to surface */
}


void lp_rast_end_tile( struct lp_rasterizer *rast )
{
   RAST_DEBUG("%s\n", __FUNCTION__);

   if (rast->state.write_color)
      lp_rast_store_color(rast);

   if (rast->state.write_zstencil)
      lp_rast_store_zstencil(rast);
}


/* Shutdown:
 */
void lp_rast_destroy( struct lp_rasterizer *rast )
{
   pipe_surface_reference(&rast->state.cbuf, NULL);
   pipe_surface_reference(&rast->state.zsbuf, NULL);
   align_free(rast->tile.depth);
   align_free(rast->tile.color);
   FREE(rast);
}