/**********************************************************
 * Copyright 2008-2009 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, 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 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 "util/u_inlines.h"
#include "pipe/p_defines.h"
#include "util/u_math.h"

#include "svga_context.h"
#include "svga_state.h"
#include "svga_cmd.h"


struct rs_queue {
   unsigned rs_count;
   SVGA3dRenderState rs[SVGA3D_RS_MAX];
};


#define EMIT_RS(svga, value, token, fail)                       \
do {                                                            \
   if (svga->state.hw_draw.rs[SVGA3D_RS_##token] != value) {    \
      svga_queue_rs( &queue, SVGA3D_RS_##token, value );        \
      svga->state.hw_draw.rs[SVGA3D_RS_##token] = value;        \
   }                                                            \
} while (0)

#define EMIT_RS_FLOAT(svga, fvalue, token, fail)                \
do {                                                            \
   unsigned value = fui(fvalue);                                \
   if (svga->state.hw_draw.rs[SVGA3D_RS_##token] != value) {    \
      svga_queue_rs( &queue, SVGA3D_RS_##token, value );        \
      svga->state.hw_draw.rs[SVGA3D_RS_##token] = value;        \
   }                                                            \
} while (0)


static INLINE void
svga_queue_rs( struct rs_queue *q,
               unsigned rss,
               unsigned value )
{
   q->rs[q->rs_count].state = rss;
   q->rs[q->rs_count].uintValue = value;
   q->rs_count++;
}


/* Compare old and new render states and emit differences between them
 * to hardware.  Simplest implementation would be to emit the whole of
 * the "to" state.
 */
static int emit_rss( struct svga_context *svga,
                     unsigned dirty )
{
   struct rs_queue queue;

   queue.rs_count = 0;

   if (dirty & SVGA_NEW_BLEND) {
      const struct svga_blend_state *curr = svga->curr.blend;

      EMIT_RS( svga, curr->rt[0].writemask, COLORWRITEENABLE, fail );
      EMIT_RS( svga, curr->rt[0].blend_enable, BLENDENABLE, fail );

      if (curr->rt[0].blend_enable) {
         EMIT_RS( svga, curr->rt[0].srcblend, SRCBLEND, fail );
         EMIT_RS( svga, curr->rt[0].dstblend, DSTBLEND, fail );
         EMIT_RS( svga, curr->rt[0].blendeq, BLENDEQUATION, fail );

         EMIT_RS( svga, curr->rt[0].separate_alpha_blend_enable, 
                  SEPARATEALPHABLENDENABLE, fail );

         if (curr->rt[0].separate_alpha_blend_enable) {
            EMIT_RS( svga, curr->rt[0].srcblend_alpha, SRCBLENDALPHA, fail );
            EMIT_RS( svga, curr->rt[0].dstblend_alpha, DSTBLENDALPHA, fail );
            EMIT_RS( svga, curr->rt[0].blendeq_alpha, BLENDEQUATIONALPHA, fail );
         }
      }
   }

   if (dirty & SVGA_NEW_BLEND_COLOR) {
      uint32 color;
      uint32 r = float_to_ubyte(svga->curr.blend_color.color[0]);
      uint32 g = float_to_ubyte(svga->curr.blend_color.color[1]);
      uint32 b = float_to_ubyte(svga->curr.blend_color.color[2]);
      uint32 a = float_to_ubyte(svga->curr.blend_color.color[3]);

      color = (a << 24) | (r << 16) | (g << 8) | b;

      EMIT_RS( svga, color, BLENDCOLOR, fail );
   }

   if (dirty & (SVGA_NEW_DEPTH_STENCIL | SVGA_NEW_RAST)) {
      const struct svga_depth_stencil_state *curr = svga->curr.depth; 
      const struct svga_rasterizer_state *rast = svga->curr.rast; 

      if (!curr->stencil[0].enabled) 
      {
         /* Stencil disabled
          */
         EMIT_RS( svga, FALSE, STENCILENABLE, fail );
         EMIT_RS( svga, FALSE, STENCILENABLE2SIDED, fail );
      }
      else if (curr->stencil[0].enabled && !curr->stencil[1].enabled)
      {
         /* Regular stencil
          */
         EMIT_RS( svga, TRUE, STENCILENABLE, fail );
         EMIT_RS( svga, FALSE, STENCILENABLE2SIDED, fail );

         EMIT_RS( svga, curr->stencil[0].func,  STENCILFUNC, fail );
         EMIT_RS( svga, curr->stencil[0].fail,  STENCILFAIL, fail );
         EMIT_RS( svga, curr->stencil[0].zfail, STENCILZFAIL, fail );
         EMIT_RS( svga, curr->stencil[0].pass,  STENCILPASS, fail );

         EMIT_RS( svga, curr->stencil_mask, STENCILMASK, fail );
         EMIT_RS( svga, curr->stencil_writemask, STENCILWRITEMASK, fail );
      }
      else 
      {
         int cw, ccw;

         /* Hardware frontwinding is always CW, so if ours is also CW,
          * then our definition of front face agrees with hardware.
          * Otherwise need to flip.
          */
         if (rast->templ.front_ccw) {
            ccw = 0;
            cw = 1;
         }
         else {
            ccw = 1;
            cw = 0;
         }

         /* Twoside stencil
          */
         EMIT_RS( svga, TRUE, STENCILENABLE, fail );
         EMIT_RS( svga, TRUE, STENCILENABLE2SIDED, fail );

         EMIT_RS( svga, curr->stencil[cw].func,  STENCILFUNC, fail );
         EMIT_RS( svga, curr->stencil[cw].fail,  STENCILFAIL, fail );
         EMIT_RS( svga, curr->stencil[cw].zfail, STENCILZFAIL, fail );
         EMIT_RS( svga, curr->stencil[cw].pass,  STENCILPASS, fail );

         EMIT_RS( svga, curr->stencil[ccw].func,  CCWSTENCILFUNC, fail );
         EMIT_RS( svga, curr->stencil[ccw].fail,  CCWSTENCILFAIL, fail );
         EMIT_RS( svga, curr->stencil[ccw].zfail, CCWSTENCILZFAIL, fail );
         EMIT_RS( svga, curr->stencil[ccw].pass,  CCWSTENCILPASS, fail );

         EMIT_RS( svga, curr->stencil_mask, STENCILMASK, fail );
         EMIT_RS( svga, curr->stencil_writemask, STENCILWRITEMASK, fail );
      }

      EMIT_RS( svga, curr->zenable, ZENABLE, fail );
      if (curr->zenable) {
         EMIT_RS( svga, curr->zfunc, ZFUNC, fail );
         EMIT_RS( svga, curr->zwriteenable, ZWRITEENABLE, fail );
      }

      EMIT_RS( svga, curr->alphatestenable, ALPHATESTENABLE, fail );
      if (curr->alphatestenable) {
         EMIT_RS( svga, curr->alphafunc, ALPHAFUNC, fail );
         EMIT_RS_FLOAT( svga, curr->alpharef, ALPHAREF, fail );
      }
   }

   if (dirty & SVGA_NEW_STENCIL_REF) {
      EMIT_RS( svga, svga->curr.stencil_ref.ref_value[0], STENCILREF, fail );
   }

   if (dirty & (SVGA_NEW_RAST | SVGA_NEW_NEED_PIPELINE))
   {
      const struct svga_rasterizer_state *curr = svga->curr.rast; 
      unsigned cullmode = curr->cullmode;

      /* Shademode: still need to rearrange index list to move
       * flat-shading PV first vertex.
       */
      EMIT_RS( svga, curr->shademode, SHADEMODE, fail );

      /* Don't do culling while the software pipeline is active.  It
       * does it for us, and additionally introduces potentially
       * back-facing triangles.
       */
      if (svga->state.sw.need_pipeline)
         cullmode = SVGA3D_FACE_NONE;

      EMIT_RS( svga, cullmode, CULLMODE, fail );
      EMIT_RS( svga, curr->scissortestenable, SCISSORTESTENABLE, fail );
      EMIT_RS( svga, curr->multisampleantialias, MULTISAMPLEANTIALIAS, fail );
      EMIT_RS( svga, curr->lastpixel, LASTPIXEL, fail );
      EMIT_RS( svga, curr->linepattern, LINEPATTERN, fail );
      EMIT_RS_FLOAT( svga, curr->pointsize, POINTSIZE, fail );
      /* XXX still need to set this? */
      EMIT_RS_FLOAT( svga, 0.0, POINTSIZEMIN, fail );
      EMIT_RS_FLOAT( svga, SVGA_MAX_POINTSIZE, POINTSIZEMAX, fail );
   }

   if (dirty & (SVGA_NEW_RAST | SVGA_NEW_FRAME_BUFFER | SVGA_NEW_NEED_PIPELINE))
   {
      const struct svga_rasterizer_state *curr = svga->curr.rast; 
      float slope = 0.0;
      float bias  = 0.0;

      /* Need to modify depth bias according to bound depthbuffer
       * format.  Don't do hardware depthbias while the software
       * pipeline is active.
       */
      if (!svga->state.sw.need_pipeline &&
          svga->curr.framebuffer.zsbuf)
      {
         slope = curr->slopescaledepthbias;
         bias  = svga->curr.depthscale * curr->depthbias;
      }

      EMIT_RS_FLOAT( svga, slope, SLOPESCALEDEPTHBIAS, fail );
      EMIT_RS_FLOAT( svga, bias, DEPTHBIAS, fail );
   }


   if (queue.rs_count) {
      SVGA3dRenderState *rs;

      if (SVGA3D_BeginSetRenderState( svga->swc,
                                      &rs,
                                      queue.rs_count ) != PIPE_OK)
         goto fail;

      memcpy( rs,
              queue.rs,
              queue.rs_count * sizeof queue.rs[0]);

      SVGA_FIFOCommitAll( svga->swc );
   }

   return 0;

fail:
   /* XXX: need to poison cached hardware state on failure to ensure
    * dirty state gets re-emitted.  Fix this by re-instating partial
    * FIFOCommit command and only updating cached hw state once the
    * initial allocation has succeeded.
    */
   memset(svga->state.hw_draw.rs, 0xcd, sizeof(svga->state.hw_draw.rs));

   return PIPE_ERROR_OUT_OF_MEMORY;
}


struct svga_tracked_state svga_hw_rss = 
{
   "hw rss state",

   (SVGA_NEW_BLEND |
    SVGA_NEW_BLEND_COLOR |
    SVGA_NEW_DEPTH_STENCIL |
    SVGA_NEW_STENCIL_REF |
    SVGA_NEW_RAST |
    SVGA_NEW_FRAME_BUFFER |
    SVGA_NEW_NEED_PIPELINE),

   emit_rss
};