/**********************************************************
 * 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_framebuffer.h"
#include "util/u_inlines.h"
#include "util/u_pstipple.h"

#include "svga_cmd.h"
#include "svga_context.h"
#include "svga_screen.h"
#include "svga_surface.h"
#include "svga_resource_texture.h"


static void
svga_set_scissor_states(struct pipe_context *pipe,
                        unsigned start_slot,
                        unsigned num_scissors,
                        const struct pipe_scissor_state *scissors)
{
   ASSERTED struct svga_screen *svgascreen = svga_screen(pipe->screen);
   struct svga_context *svga = svga_context(pipe);
   unsigned i, num_sc;

   assert(start_slot + num_scissors <= svgascreen->max_viewports);

   for (i = 0, num_sc = start_slot; i < num_scissors; i++)  {
      svga->curr.scissor[num_sc++] = scissors[i]; /* struct copy */
   }

   svga->dirty |= SVGA_NEW_SCISSOR;
}


static void
svga_set_polygon_stipple(struct pipe_context *pipe,
                         const struct pipe_poly_stipple *stipple)
{
   struct svga_context *svga = svga_context(pipe);

   /* release old texture */
   pipe_resource_reference(&svga->polygon_stipple.texture, NULL);

   /* release old sampler view */
   if (svga->polygon_stipple.sampler_view) {
      pipe->sampler_view_destroy(pipe,
                                 &svga->polygon_stipple.sampler_view->base);
   }

   /* create new stipple texture */
   svga->polygon_stipple.texture =
      util_pstipple_create_stipple_texture(pipe, stipple->stipple);

   /* create new sampler view */
   svga->polygon_stipple.sampler_view =
      (struct svga_pipe_sampler_view *)
      util_pstipple_create_sampler_view(pipe,
                                        svga->polygon_stipple.texture);

   /* allocate sampler state, if first time */
   if (!svga->polygon_stipple.sampler) {
      svga->polygon_stipple.sampler = util_pstipple_create_sampler(pipe);
   }

   svga->dirty |= SVGA_NEW_STIPPLE;
}


void
svga_cleanup_framebuffer(struct svga_context *svga)
{
   struct svga_screen *svgascreen = svga_screen(svga->pipe.screen);
   struct pipe_framebuffer_state *curr = &svga->curr.framebuffer;
   struct pipe_framebuffer_state *hw = &svga->state.hw_clear.framebuffer;
   unsigned i;

   for (i = 0; i < svgascreen->max_color_buffers; i++) {
      pipe_surface_reference(&curr->cbufs[i], NULL);
      pipe_surface_reference(&hw->cbufs[i], NULL);
   }

   pipe_surface_reference(&curr->zsbuf, NULL);
   pipe_surface_reference(&hw->zsbuf, NULL);
}


#define DEPTH_BIAS_SCALE_FACTOR_D16    ((float)(1<<15))
#define DEPTH_BIAS_SCALE_FACTOR_D24S8  ((float)(1<<23))
#define DEPTH_BIAS_SCALE_FACTOR_D32    ((float)(1<<31))


static void
svga_set_framebuffer_state(struct pipe_context *pipe,
                           const struct pipe_framebuffer_state *fb)
{
   struct svga_context *svga = svga_context(pipe);
   struct pipe_framebuffer_state *dst = &svga->curr.framebuffer;
   unsigned i;

   /* make sure any pending drawing calls are flushed before changing
    * the framebuffer state
    */
   svga_hwtnl_flush_retry(svga);

   dst->width = fb->width;
   dst->height = fb->height;
   dst->nr_cbufs = fb->nr_cbufs;

   /* Check that all surfaces are the same size.
    * Actually, the virtual hardware may support rendertargets with
    * different size, depending on the host API and driver,
    */
   {
      int width = 0, height = 0;
      if (fb->zsbuf) {
         width = fb->zsbuf->width;
         height = fb->zsbuf->height;
      }
      for (i = 0; i < fb->nr_cbufs; ++i) {
         if (fb->cbufs[i]) {
            if (width && height) {
               if (fb->cbufs[i]->width != width ||
                   fb->cbufs[i]->height != height) {
                  debug_warning("Mixed-size color and depth/stencil surfaces "
                                "may not work properly");
               }
            }
            else {
               width = fb->cbufs[i]->width;
               height = fb->cbufs[i]->height;
            }
         }
      }
   }

   util_copy_framebuffer_state(dst, fb);

   if (svga->curr.framebuffer.zsbuf) {
      switch (svga->curr.framebuffer.zsbuf->format) {
      case PIPE_FORMAT_Z16_UNORM:
         svga->curr.depthscale = 1.0f / DEPTH_BIAS_SCALE_FACTOR_D16;
         break;
      case PIPE_FORMAT_Z24_UNORM_S8_UINT:
      case PIPE_FORMAT_Z24X8_UNORM:
      case PIPE_FORMAT_S8_UINT_Z24_UNORM:
      case PIPE_FORMAT_X8Z24_UNORM:
         svga->curr.depthscale = 1.0f / DEPTH_BIAS_SCALE_FACTOR_D24S8;
         break;
      case PIPE_FORMAT_Z32_UNORM:
         svga->curr.depthscale = 1.0f / DEPTH_BIAS_SCALE_FACTOR_D32;
         break;
      case PIPE_FORMAT_Z32_FLOAT:
         svga->curr.depthscale = 1.0f / ((float)(1<<23));
         break;
      default:
         svga->curr.depthscale = 0.0f;
         break;
      }
   }
   else {
      svga->curr.depthscale = 0.0f;
   }

   svga->dirty |= SVGA_NEW_FRAME_BUFFER;
}


static void
svga_set_clip_state(struct pipe_context *pipe,
                    const struct pipe_clip_state *clip)
{
   struct svga_context *svga = svga_context(pipe);

   svga->curr.clip = *clip; /* struct copy */

   svga->dirty |= SVGA_NEW_CLIP;
}


static void
svga_set_viewport_states(struct pipe_context *pipe,
                         unsigned start_slot,
                         unsigned num_viewports,
                         const struct pipe_viewport_state *viewports)
{
   struct svga_context *svga = svga_context(pipe);
   ASSERTED struct svga_screen *svgascreen = svga_screen(pipe->screen);
   unsigned i, num_vp;

   assert(start_slot + num_viewports <= svgascreen->max_viewports);

   for (i = 0, num_vp = start_slot; i < num_viewports; i++)  {
      svga->curr.viewport[num_vp++] = viewports[i]; /* struct copy */
   }

   svga->dirty |= SVGA_NEW_VIEWPORT;
}


/**
 * Called by state tracker to specify a callback function the driver
 * can use to report info back to the gallium frontend.
 */
static void
svga_set_debug_callback(struct pipe_context *pipe,
                        const struct pipe_debug_callback *cb)
{
   struct svga_context *svga = svga_context(pipe);

   if (cb) {
      svga->debug.callback = *cb;
      svga->swc->debug_callback = &svga->debug.callback;
   } else {
      memset(&svga->debug.callback, 0, sizeof(svga->debug.callback));
      svga->swc->debug_callback = NULL;
   }
}


void
svga_init_misc_functions(struct svga_context *svga)
{
   svga->pipe.set_scissor_states = svga_set_scissor_states;
   svga->pipe.set_polygon_stipple = svga_set_polygon_stipple;
   svga->pipe.set_framebuffer_state = svga_set_framebuffer_state;
   svga->pipe.set_clip_state = svga_set_clip_state;
   svga->pipe.set_viewport_states = svga_set_viewport_states;
   svga->pipe.set_debug_callback = svga_set_debug_callback;
}
