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/**************************************************************************

 *

 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.

 * Copyright 2009, 2012 Intel Corporation.

 * 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 TUNGSTEN GRAPHICS 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 "main/glheader.h"

#include "main/mtypes.h"

#include "main/condrender.h"

#include "swrast/swrast.h"

#include "drivers/common/meta.h"

#include "intel_batchbuffer.h"

#include "intel_blit.h"

#include "intel_fbo.h"

#include "intel_mipmap_tree.h"

#include "intel_regions.h"

#include "brw_context.h"

#include "brw_blorp.h"

#define FILE_DEBUG_FLAG DEBUG_BLIT

static const char *buffer_names[] = {

   [BUFFER_FRONT_LEFT] = "front",

   [BUFFER_BACK_LEFT] = "back",

   [BUFFER_FRONT_RIGHT] = "front right",

   [BUFFER_BACK_RIGHT] = "back right",

   [BUFFER_DEPTH] = "depth",

   [BUFFER_STENCIL] = "stencil",

   [BUFFER_ACCUM] = "accum",

   [BUFFER_AUX0] = "aux0",

   [BUFFER_COLOR0] = "color0",

   [BUFFER_COLOR1] = "color1",

   [BUFFER_COLOR2] = "color2",

   [BUFFER_COLOR3] = "color3",

   [BUFFER_COLOR4] = "color4",

   [BUFFER_COLOR5] = "color5",

   [BUFFER_COLOR6] = "color6",

   [BUFFER_COLOR7] = "color7",

};

static void

debug_mask(const char *name, GLbitfield mask)

{

   GLuint i;

   if (unlikely(INTEL_DEBUG & DEBUG_BLIT)) {

      DBG("%s clear:", name);

      for (i = 0; i < BUFFER_COUNT; i++) {

	 if (mask & (1 << i))

	    DBG(" %s", buffer_names[i]);

      }

      DBG("\n");

   }

}

/**

 * Returns true if the scissor is a noop (cuts out nothing).

 */

static bool

noop_scissor(struct gl_context *ctx, struct gl_framebuffer *fb)

{

   return ctx->Scissor.X <= 0 &&

          ctx->Scissor.Y <= 0 &&

          ctx->Scissor.Width >= fb->Width &&

          ctx->Scissor.Height >= fb->Height;

}

/**

 * Implements fast depth clears on gen6+.

 *

 * Fast clears basically work by setting a flag in each of the subspans

 * represented in the HiZ buffer that says "When you need the depth values for

 * this subspan, it's the hardware's current clear value."  Then later rendering

 * can just use the static clear value instead of referencing memory.

 *

 * The tricky part of the implementation is that you have to have the clear

 * value that was used on the depth buffer in place for all further rendering,

 * at least until a resolve to the real depth buffer happens.

 */

static bool

brw_fast_clear_depth(struct gl_context *ctx)

{

   struct brw_context *brw = brw_context(ctx);

   struct gl_framebuffer *fb = ctx->DrawBuffer;

   struct intel_renderbuffer *depth_irb =

      intel_get_renderbuffer(fb, BUFFER_DEPTH);

   struct intel_mipmap_tree *mt = depth_irb->mt;

   if (brw->gen < 6)

      return false;

   if (!intel_renderbuffer_has_hiz(depth_irb))

      return false;

   /* We only handle full buffer clears -- otherwise you'd have to track whether

    * a previous clear had happened at a different clear value and resolve it

    * first.

    */

   if (ctx->Scissor.Enabled && !noop_scissor(ctx, fb)) {

      perf_debug("Failed to fast clear depth due to scissor being enabled.  "

                 "Possible 5%% performance win if avoided.\n");

      return false;

   }

   uint32_t depth_clear_value;

   switch (mt->format) {

   case MESA_FORMAT_Z32_FLOAT_X24S8:

   case MESA_FORMAT_S8_Z24:

      /* From the Sandy Bridge PRM, volume 2 part 1, page 314:

       *

       *     "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be

       *      enabled (the legacy method of clearing must be performed):

       *

       *      - If the depth buffer format is D32_FLOAT_S8X24_UINT or

       *        D24_UNORM_S8_UINT.

       */

      return false;

   case MESA_FORMAT_Z32_FLOAT:

      depth_clear_value = float_as_int(ctx->Depth.Clear);

      break;

   case MESA_FORMAT_Z16:

      /* From the Sandy Bridge PRM, volume 2 part 1, page 314:

       *

       *     "[DevSNB+]: Several cases exist where Depth Buffer Clear cannot be

       *      enabled (the legacy method of clearing must be performed):

       *

       *      - DevSNB{W/A}]: When depth buffer format is D16_UNORM and the

       *        width of the map (LOD0) is not multiple of 16, fast clear

       *        optimization must be disabled.

       */

      if (brw->gen == 6 && (mt->level[depth_irb->mt_level].width % 16) != 0)

	 return false;

      /* FALLTHROUGH */

   default:

      depth_clear_value = fb->_DepthMax * ctx->Depth.Clear;

      break;

   }

   /* If we're clearing to a new clear value, then we need to resolve any clear

    * flags out of the HiZ buffer into the real depth buffer.

    */

   if (mt->depth_clear_value != depth_clear_value) {

      intel_miptree_all_slices_resolve_depth(brw, mt);

      mt->depth_clear_value = depth_clear_value;

   }

   /* From the Sandy Bridge PRM, volume 2 part 1, page 313:

    *

    *     "If other rendering operations have preceded this clear, a

    *      PIPE_CONTROL with write cache flush enabled and Z-inhibit disabled

    *      must be issued before the rectangle primitive used for the depth

    *      buffer clear operation.

    */

   intel_batchbuffer_emit_mi_flush(brw);

   intel_hiz_exec(brw, mt, depth_irb->mt_level, depth_irb->mt_layer,

		  GEN6_HIZ_OP_DEPTH_CLEAR);

   if (brw->gen == 6) {

      /* From the Sandy Bridge PRM, volume 2 part 1, page 314:

       *

       *     "DevSNB, DevSNB-B{W/A}]: Depth buffer clear pass must be followed

       *      by a PIPE_CONTROL command with DEPTH_STALL bit set and Then

       *      followed by Depth FLUSH'

      */

      intel_batchbuffer_emit_mi_flush(brw);

   }

   /* Now, the HiZ buffer contains data that needs to be resolved to the depth

    * buffer.

    */

   intel_renderbuffer_set_needs_depth_resolve(depth_irb);

   return true;

}

/**

 * Called by ctx->Driver.Clear.

 */

static void

brw_clear(struct gl_context *ctx, GLbitfield mask)

{

   struct brw_context *brw = brw_context(ctx);

   struct gl_framebuffer *fb = ctx->DrawBuffer;

   bool partial_clear = ctx->Scissor.Enabled && !noop_scissor(ctx, fb);

   if (!_mesa_check_conditional_render(ctx))

      return;

   if (mask & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT)) {

      brw->front_buffer_dirty = true;

   }

   intel_prepare_render(brw);

   brw_workaround_depthstencil_alignment(brw, partial_clear ? 0 : mask);

   if (mask & BUFFER_BIT_DEPTH) {

      if (brw_fast_clear_depth(ctx)) {

	 DBG("fast clear: depth\n");

	 mask &= ~BUFFER_BIT_DEPTH;

      }

   }

   /* BLORP is currently only supported on Gen6+. */

   if (brw->gen >= 6) {

      if (mask & BUFFER_BITS_COLOR) {

         if (brw_blorp_clear_color(brw, fb, partial_clear)) {

            debug_mask("blorp color", mask & BUFFER_BITS_COLOR);

            mask &= ~BUFFER_BITS_COLOR;

         }

      }

   }

   GLbitfield tri_mask = mask & (BUFFER_BITS_COLOR |

				 BUFFER_BIT_STENCIL |

				 BUFFER_BIT_DEPTH);

   if (tri_mask) {

      debug_mask("tri", tri_mask);

      mask &= ~tri_mask;

      if (ctx->API == API_OPENGLES) {

         _mesa_meta_Clear(&brw->ctx, tri_mask);

      } else {

         _mesa_meta_glsl_Clear(&brw->ctx, tri_mask);

      }

   }

   /* Any strange buffers get passed off to swrast */

   if (mask) {

      debug_mask("swrast", mask);

      _swrast_Clear(ctx, mask);

   }

}

void

intelInitClearFuncs(struct dd_function_table *functions)

{

   functions->Clear = brw_clear;

}