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/*

 * Copyright © 2011 Intel Corporation

 *

 * 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 (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 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.

 */

/** \file gen6_sol.c

 *

 * Code to initialize the binding table entries used by transform feedback.

 */

#include "main/macros.h"

#include "brw_context.h"

#include "intel_batchbuffer.h"

#include "brw_defines.h"

#include "brw_state.h"

#include "main/transformfeedback.h"

static void

gen6_update_sol_surfaces(struct brw_context *brw)

{

   struct gl_context *ctx = &brw->ctx;

   /* BRW_NEW_TRANSFORM_FEEDBACK */

   struct gl_transform_feedback_object *xfb_obj =

      ctx->TransformFeedback.CurrentObject;

   /* BRW_NEW_VERTEX_PROGRAM */

   const struct gl_shader_program *shaderprog =

      ctx->Shader.CurrentVertexProgram;

   const struct gl_transform_feedback_info *linked_xfb_info =

      &shaderprog->LinkedTransformFeedback;

   int i;

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

      const int surf_index = SURF_INDEX_SOL_BINDING(i);

      if (_mesa_is_xfb_active_and_unpaused(ctx) &&

          i < linked_xfb_info->NumOutputs) {

         unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;

         unsigned buffer_offset =

            xfb_obj->Offset[buffer] / 4 +

            linked_xfb_info->Outputs[i].DstOffset;

         brw_update_sol_surface(

            brw, xfb_obj->Buffers[buffer], &brw->gs.surf_offset[surf_index],

            linked_xfb_info->Outputs[i].NumComponents,

            linked_xfb_info->BufferStride[buffer], buffer_offset);

      } else {

         brw->gs.surf_offset[surf_index] = 0;

      }

   }

   brw->state.dirty.brw |= BRW_NEW_SURFACES;

}

const struct brw_tracked_state gen6_sol_surface = {

   .dirty = {

      .mesa = 0,

      .brw = (BRW_NEW_BATCH |

              BRW_NEW_VERTEX_PROGRAM |

              BRW_NEW_TRANSFORM_FEEDBACK),

      .cache = 0

   },

   .emit = gen6_update_sol_surfaces,

};

/**

 * Constructs the binding table for the WM surface state, which maps unit

 * numbers to surface state objects.

 */

static void

brw_gs_upload_binding_table(struct brw_context *brw)

{

   struct gl_context *ctx = &brw->ctx;

   /* BRW_NEW_VERTEX_PROGRAM */

   const struct gl_shader_program *shaderprog =

      ctx->Shader.CurrentVertexProgram;

   bool has_surfaces = false;

   uint32_t *bind;

   if (shaderprog) {

      const struct gl_transform_feedback_info *linked_xfb_info =

	 &shaderprog->LinkedTransformFeedback;

      /* Currently we only ever upload surfaces for SOL. */

      has_surfaces = linked_xfb_info->NumOutputs != 0;

   }

   /* Skip making a binding table if we don't have anything to put in it. */

   if (!has_surfaces) {

      if (brw->gs.bind_bo_offset != 0) {

	 brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;

	 brw->gs.bind_bo_offset = 0;

      }

      return;

   }

   /* Might want to calculate nr_surfaces first, to avoid taking up so much

    * space for the binding table.

    */

   bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,

			  sizeof(uint32_t) * BRW_MAX_GS_SURFACES,

			  32, &brw->gs.bind_bo_offset);

   /* BRW_NEW_SURFACES */

   memcpy(bind, brw->gs.surf_offset, BRW_MAX_GS_SURFACES * sizeof(uint32_t));

   brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;

}

const struct brw_tracked_state gen6_gs_binding_table = {

   .dirty = {

      .mesa = 0,

      .brw = (BRW_NEW_BATCH |

	      BRW_NEW_VERTEX_PROGRAM |

	      BRW_NEW_SURFACES),

      .cache = 0

   },

   .emit = brw_gs_upload_binding_table,

};

void

brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,

			     struct gl_transform_feedback_object *obj)

{

   struct brw_context *brw = brw_context(ctx);

   const struct gl_shader_program *vs_prog =

      ctx->Shader.CurrentVertexProgram;

   const struct gl_transform_feedback_info *linked_xfb_info =

      &vs_prog->LinkedTransformFeedback;

   struct gl_transform_feedback_object *xfb_obj =

      ctx->TransformFeedback.CurrentObject;

   assert(brw->gen == 6);

   /* Compute the maximum number of vertices that we can write without

    * overflowing any of the buffers currently being used for feedback.

    */

   unsigned max_index

      = _mesa_compute_max_transform_feedback_vertices(xfb_obj,

                                                      linked_xfb_info);

   /* 3DSTATE_GS_SVB_INDEX is non-pipelined. */

   intel_emit_post_sync_nonzero_flush(brw);

   /* Initialize the SVBI 0 register to zero and set the maximum index. */

   BEGIN_BATCH(4);

   OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));

   OUT_BATCH(0); /* SVBI 0 */

   OUT_BATCH(0); /* starting index */

   OUT_BATCH(max_index);

   ADVANCE_BATCH();

   /* Initialize the rest of the unused streams to sane values.  Otherwise,

    * they may indicate that there is no room to write data and prevent

    * anything from happening at all.

    */

   for (int i = 1; i < 4; i++) {

      BEGIN_BATCH(4);

      OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));

      OUT_BATCH(i << SVB_INDEX_SHIFT);

      OUT_BATCH(0); /* starting index */

      OUT_BATCH(0xffffffff);

      ADVANCE_BATCH();

   }

}

void

brw_end_transform_feedback(struct gl_context *ctx,

                           struct gl_transform_feedback_object *obj)

{

   /* After EndTransformFeedback, it's likely that the client program will try

    * to draw using the contents of the transform feedback buffer as vertex

    * input.  In order for this to work, we need to flush the data through at

    * least the GS stage of the pipeline, and flush out the render cache.  For

    * simplicity, just do a full flush.

    */

   struct brw_context *brw = brw_context(ctx);

   intel_batchbuffer_emit_mi_flush(brw);

}