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

 *

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

 * 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 

#include "main/glheader.h"

#include "main/context.h"

#include "main/condrender.h"

#include "main/samplerobj.h"

#include "main/state.h"

#include "main/enums.h"

#include "main/macros.h"

#include "main/transformfeedback.h"

#include "tnl/tnl.h"

#include "vbo/vbo_context.h"

#include "swrast/swrast.h"

#include "swrast_setup/swrast_setup.h"

#include "drivers/common/meta.h"

#include "brw_blorp.h"

#include "brw_draw.h"

#include "brw_defines.h"

#include "brw_context.h"

#include "brw_state.h"

#include "intel_batchbuffer.h"

#include "intel_fbo.h"

#include "intel_mipmap_tree.h"

#include "intel_regions.h"

#define FILE_DEBUG_FLAG DEBUG_PRIMS

static GLuint prim_to_hw_prim[GL_POLYGON+1] = {

   _3DPRIM_POINTLIST,

   _3DPRIM_LINELIST,

   _3DPRIM_LINELOOP,

   _3DPRIM_LINESTRIP,

   _3DPRIM_TRILIST,

   _3DPRIM_TRISTRIP,

   _3DPRIM_TRIFAN,

   _3DPRIM_QUADLIST,

   _3DPRIM_QUADSTRIP,

   _3DPRIM_POLYGON

};

static const GLenum reduced_prim[GL_POLYGON+1] = {

   GL_POINTS,

   GL_LINES,

   GL_LINES,

   GL_LINES,

   GL_TRIANGLES,

   GL_TRIANGLES,

   GL_TRIANGLES,

   GL_TRIANGLES,

   GL_TRIANGLES,

   GL_TRIANGLES

};

/* When the primitive changes, set a state bit and re-validate.  Not

 * the nicest and would rather deal with this by having all the

 * programs be immune to the active primitive (ie. cope with all

 * possibilities).  That may not be realistic however.

 */

static void brw_set_prim(struct brw_context *brw,

                         const struct _mesa_prim *prim)

{

   struct gl_context *ctx = &brw->ctx;

   uint32_t hw_prim = prim_to_hw_prim[prim->mode];

   DBG("PRIM: %s\n", _mesa_lookup_enum_by_nr(prim->mode));

   /* Slight optimization to avoid the GS program when not needed:

    */

   if (prim->mode == GL_QUAD_STRIP &&

       ctx->Light.ShadeModel != GL_FLAT &&

       ctx->Polygon.FrontMode == GL_FILL &&

       ctx->Polygon.BackMode == GL_FILL)

      hw_prim = _3DPRIM_TRISTRIP;

   if (prim->mode == GL_QUADS && prim->count == 4 &&

       ctx->Light.ShadeModel != GL_FLAT &&

       ctx->Polygon.FrontMode == GL_FILL &&

       ctx->Polygon.BackMode == GL_FILL) {

      hw_prim = _3DPRIM_TRIFAN;

   }

   if (hw_prim != brw->primitive) {

      brw->primitive = hw_prim;

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

      if (reduced_prim[prim->mode] != brw->reduced_primitive) {

	 brw->reduced_primitive = reduced_prim[prim->mode];

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

      }

   }

}

static void gen6_set_prim(struct brw_context *brw,

                          const struct _mesa_prim *prim)

{

   uint32_t hw_prim;

   DBG("PRIM: %s\n", _mesa_lookup_enum_by_nr(prim->mode));

   hw_prim = prim_to_hw_prim[prim->mode];

   if (hw_prim != brw->primitive) {

      brw->primitive = hw_prim;

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

   }

}

/**

 * The hardware is capable of removing dangling vertices on its own; however,

 * prior to Gen6, we sometimes convert quads into trifans (and quad strips

 * into tristrips), since pre-Gen6 hardware requires a GS to render quads.

 * This function manually trims dangling vertices from a draw call involving

 * quads so that those dangling vertices won't get drawn when we convert to

 * trifans/tristrips.

 */

static GLuint trim(GLenum prim, GLuint length)

{

   if (prim == GL_QUAD_STRIP)

      return length > 3 ? (length - length % 2) : 0;

   else if (prim == GL_QUADS)

      return length - length % 4;

   else

      return length;

}

static void brw_emit_prim(struct brw_context *brw,

			  const struct _mesa_prim *prim,

			  uint32_t hw_prim)

{

   int verts_per_instance;

   int vertex_access_type;

   int start_vertex_location;

   int base_vertex_location;

   DBG("PRIM: %s %d %d\n", _mesa_lookup_enum_by_nr(prim->mode),

       prim->start, prim->count);

   start_vertex_location = prim->start;

   base_vertex_location = prim->basevertex;

   if (prim->indexed) {

      vertex_access_type = GEN4_3DPRIM_VERTEXBUFFER_ACCESS_RANDOM;

      start_vertex_location += brw->ib.start_vertex_offset;

      base_vertex_location += brw->vb.start_vertex_bias;

   } else {

      vertex_access_type = GEN4_3DPRIM_VERTEXBUFFER_ACCESS_SEQUENTIAL;

      start_vertex_location += brw->vb.start_vertex_bias;

   }

   /* We only need to trim the primitive count on pre-Gen6. */

   if (brw->gen < 6)

      verts_per_instance = trim(prim->mode, prim->count);

   else

      verts_per_instance = prim->count;

   /* If nothing to emit, just return. */

   if (verts_per_instance == 0)

      return;

   /* If we're set to always flush, do it before and after the primitive emit.

    * We want to catch both missed flushes that hurt instruction/state cache

    * and missed flushes of the render cache as it heads to other parts of

    * the besides the draw code.

    */

   if (brw->always_flush_cache) {

      intel_batchbuffer_emit_mi_flush(brw);

   }

   BEGIN_BATCH(6);

   OUT_BATCH(CMD_3D_PRIM << 16 | (6 - 2) |

	     hw_prim << GEN4_3DPRIM_TOPOLOGY_TYPE_SHIFT |

	     vertex_access_type);

   OUT_BATCH(verts_per_instance);

   OUT_BATCH(start_vertex_location);

   OUT_BATCH(prim->num_instances);

   OUT_BATCH(prim->base_instance);

   OUT_BATCH(base_vertex_location);

   ADVANCE_BATCH();

   brw->batch.need_workaround_flush = true;

   if (brw->always_flush_cache) {

      intel_batchbuffer_emit_mi_flush(brw);

   }

}

static void gen7_emit_prim(struct brw_context *brw,

			   const struct _mesa_prim *prim,

			   uint32_t hw_prim)

{

   int verts_per_instance;

   int vertex_access_type;

   int start_vertex_location;

   int base_vertex_location;

   DBG("PRIM: %s %d %d\n", _mesa_lookup_enum_by_nr(prim->mode),

       prim->start, prim->count);

   start_vertex_location = prim->start;

   base_vertex_location = prim->basevertex;

   if (prim->indexed) {

      vertex_access_type = GEN7_3DPRIM_VERTEXBUFFER_ACCESS_RANDOM;

      start_vertex_location += brw->ib.start_vertex_offset;

      base_vertex_location += brw->vb.start_vertex_bias;

   } else {

      vertex_access_type = GEN7_3DPRIM_VERTEXBUFFER_ACCESS_SEQUENTIAL;

      start_vertex_location += brw->vb.start_vertex_bias;

   }

   verts_per_instance = prim->count;

   /* If nothing to emit, just return. */

   if (verts_per_instance == 0)

      return;

   /* If we're set to always flush, do it before and after the primitive emit.

    * We want to catch both missed flushes that hurt instruction/state cache

    * and missed flushes of the render cache as it heads to other parts of

    * the besides the draw code.

    */

   if (brw->always_flush_cache) {

      intel_batchbuffer_emit_mi_flush(brw);

   }

   BEGIN_BATCH(7);

   OUT_BATCH(CMD_3D_PRIM << 16 | (7 - 2));

   OUT_BATCH(hw_prim | vertex_access_type);

   OUT_BATCH(verts_per_instance);

   OUT_BATCH(start_vertex_location);

   OUT_BATCH(prim->num_instances);

   OUT_BATCH(prim->base_instance);

   OUT_BATCH(base_vertex_location);

   ADVANCE_BATCH();

   if (brw->always_flush_cache) {

      intel_batchbuffer_emit_mi_flush(brw);

   }

}

static void brw_merge_inputs( struct brw_context *brw,

		       const struct gl_client_array *arrays[])

{

   GLuint i;

   for (i = 0; i < brw->vb.nr_buffers; i++) {

      drm_intel_bo_unreference(brw->vb.buffers[i].bo);

      brw->vb.buffers[i].bo = NULL;

   }

   brw->vb.nr_buffers = 0;

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

      brw->vb.inputs[i].buffer = -1;

      brw->vb.inputs[i].glarray = arrays[i];

      brw->vb.inputs[i].attrib = (gl_vert_attrib) i;

   }

}

/*

 * \brief Resolve buffers before drawing.

 *

 * Resolve the depth buffer's HiZ buffer and resolve the depth buffer of each

 * enabled depth texture.

 *

 * (In the future, this will also perform MSAA resolves).

 */

static void

brw_predraw_resolve_buffers(struct brw_context *brw)

{

   struct gl_context *ctx = &brw->ctx;

   struct intel_renderbuffer *depth_irb;

   struct intel_texture_object *tex_obj;

   /* Resolve the depth buffer's HiZ buffer. */

   depth_irb = intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);

   if (depth_irb)

      intel_renderbuffer_resolve_hiz(brw, depth_irb);

   /* Resolve depth buffer of each enabled depth texture, and color buffer of

    * each fast-clear-enabled color texture.

    */

   for (int i = 0; i < BRW_MAX_TEX_UNIT; i++) {

      if (!ctx->Texture.Unit[i]._ReallyEnabled)

	 continue;

      tex_obj = intel_texture_object(ctx->Texture.Unit[i]._Current);

      if (!tex_obj || !tex_obj->mt)

	 continue;

      intel_miptree_all_slices_resolve_depth(brw, tex_obj->mt);

      intel_miptree_resolve_color(brw, tex_obj->mt);

   }

}

/**

 * \brief Call this after drawing to mark which buffers need resolving

 *

 * If the depth buffer was written to and if it has an accompanying HiZ

 * buffer, then mark that it needs a depth resolve.

 *

 * If the color buffer is a multisample window system buffer, then

 * mark that it needs a downsample.

 */

static void brw_postdraw_set_buffers_need_resolve(struct brw_context *brw)

{

   struct gl_context *ctx = &brw->ctx;

   struct gl_framebuffer *fb = ctx->DrawBuffer;

   struct intel_renderbuffer *front_irb = NULL;

   struct intel_renderbuffer *back_irb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);

   struct intel_renderbuffer *depth_irb = intel_get_renderbuffer(fb, BUFFER_DEPTH);

   if (brw->is_front_buffer_rendering)

      front_irb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);

   if (front_irb)

      intel_renderbuffer_set_needs_downsample(front_irb);

   if (back_irb)

      intel_renderbuffer_set_needs_downsample(back_irb);

   if (depth_irb && ctx->Depth.Mask)

      intel_renderbuffer_set_needs_depth_resolve(depth_irb);

}

/* May fail if out of video memory for texture or vbo upload, or on

 * fallback conditions.

 */

static bool brw_try_draw_prims( struct gl_context *ctx,

				     const struct gl_client_array *arrays[],

				     const struct _mesa_prim *prim,

				     GLuint nr_prims,

				     const struct _mesa_index_buffer *ib,

				     GLuint min_index,

				     GLuint max_index )

{

   struct brw_context *brw = brw_context(ctx);

   bool retval = true;

   GLuint i;

   bool fail_next = false;

   if (ctx->NewState)

      _mesa_update_state( ctx );

   /* We have to validate the textures *before* checking for fallbacks;

    * otherwise, the software fallback won't be able to rely on the

    * texture state, the firstLevel and lastLevel fields won't be

    * set in the intel texture object (they'll both be 0), and the

    * software fallback will segfault if it attempts to access any

    * texture level other than level 0.

    */

   brw_validate_textures( brw );

   intel_prepare_render(brw);

   /* This workaround has to happen outside of brw_upload_state() because it

    * may flush the batchbuffer for a blit, affecting the state flags.

    */

   brw_workaround_depthstencil_alignment(brw, 0);

   /* Resolves must occur after updating renderbuffers, updating context state,

    * and finalizing textures but before setting up any hardware state for

    * this draw call.

    */

   brw_predraw_resolve_buffers(brw);

   /* Bind all inputs, derive varying and size information:

    */

   brw_merge_inputs( brw, arrays );

   brw->ib.ib = ib;

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

   brw->vb.min_index = min_index;

   brw->vb.max_index = max_index;

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

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

      int estimated_max_prim_size;

      estimated_max_prim_size = 512; /* batchbuffer commands */

      estimated_max_prim_size += (BRW_MAX_TEX_UNIT *

				  (sizeof(struct brw_sampler_state) +

				   sizeof(struct gen5_sampler_default_color)));

      estimated_max_prim_size += 1024; /* gen6 VS push constants */

      estimated_max_prim_size += 1024; /* gen6 WM push constants */

      estimated_max_prim_size += 512; /* misc. pad */

      /* Flush the batch if it's approaching full, so that we don't wrap while

       * we've got validated state that needs to be in the same batch as the

       * primitives.

       */

      intel_batchbuffer_require_space(brw, estimated_max_prim_size, false);

      intel_batchbuffer_save_state(brw);

      if (brw->num_instances != prim->num_instances) {

         brw->num_instances = prim->num_instances;

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

      }

      if (brw->basevertex != prim->basevertex) {

         brw->basevertex = prim->basevertex;

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

      }

      if (brw->gen < 6)

	 brw_set_prim(brw, &prim[i]);

      else

	 gen6_set_prim(brw, &prim[i]);

retry:

      /* Note that before the loop, brw->state.dirty.brw was set to != 0, and

       * that the state updated in the loop outside of this block is that in

       * *_set_prim or intel_batchbuffer_flush(), which only impacts

       * brw->state.dirty.brw.

       */

      if (brw->state.dirty.brw) {

	 brw->no_batch_wrap = true;

	 brw_upload_state(brw);

      }

      if (brw->gen >= 7)

	 gen7_emit_prim(brw, &prim[i], brw->primitive);

      else

	 brw_emit_prim(brw, &prim[i], brw->primitive);

      brw->no_batch_wrap = false;

      if (dri_bufmgr_check_aperture_space(&brw->batch.bo, 1)) {

	 if (!fail_next) {

	    intel_batchbuffer_reset_to_saved(brw);

	    intel_batchbuffer_flush(brw);

	    fail_next = true;

	    goto retry;

	 } else {

	    if (intel_batchbuffer_flush(brw) == -ENOSPC) {

	       static bool warned = false;

	       if (!warned) {

		  fprintf(stderr, "i965: Single primitive emit exceeded"

			  "available aperture space\n");

		  warned = true;

	       }

	       retval = false;

	    }

	 }

      }

   }

   if (brw->always_flush_batch)

      intel_batchbuffer_flush(brw);

   brw_state_cache_check_size(brw);

   brw_postdraw_set_buffers_need_resolve(brw);

   return retval;

}

void brw_draw_prims( struct gl_context *ctx,

		     const struct _mesa_prim *prim,

		     GLuint nr_prims,

		     const struct _mesa_index_buffer *ib,

		     GLboolean index_bounds_valid,

		     GLuint min_index,

		     GLuint max_index,

		     struct gl_transform_feedback_object *tfb_vertcount )

{

   struct brw_context *brw = brw_context(ctx);

   const struct gl_client_array **arrays = ctx->Array._DrawArrays;

   if (!_mesa_check_conditional_render(ctx))

      return;

   /* Handle primitive restart if needed */

   if (brw_handle_primitive_restart(ctx, prim, nr_prims, ib)) {

      /* The draw was handled, so we can exit now */

      return;

   }

   /* If we're going to have to upload any of the user's vertex arrays, then

    * get the minimum and maximum of their index buffer so we know what range

    * to upload.

    */

   if (!vbo_all_varyings_in_vbos(arrays) && !index_bounds_valid)

      vbo_get_minmax_indices(ctx, prim, ib, &min_index, &max_index, nr_prims);

   /* Do GL_SELECT and GL_FEEDBACK rendering using swrast, even though it

    * won't support all the extensions we support.

    */

   if (ctx->RenderMode != GL_RENDER) {

      perf_debug("%s render mode not supported in hardware\n",

                 _mesa_lookup_enum_by_nr(ctx->RenderMode));

      _swsetup_Wakeup(ctx);

      _tnl_wakeup(ctx);

      _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);

      return;

   }

   /* Try drawing with the hardware, but don't do anything else if we can't

    * manage it.  swrast doesn't support our featureset, so we can't fall back

    * to it.

    */

   brw_try_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);

}

void brw_draw_init( struct brw_context *brw )

{

   struct gl_context *ctx = &brw->ctx;

   struct vbo_context *vbo = vbo_context(ctx);

   int i;

   /* Register our drawing function:

    */

   vbo->draw_prims = brw_draw_prims;

   for (i = 0; i < VERT_ATTRIB_MAX; i++)

      brw->vb.inputs[i].buffer = -1;

   brw->vb.nr_buffers = 0;

   brw->vb.nr_enabled = 0;

}

void brw_draw_destroy( struct brw_context *brw )

{

   int i;

   for (i = 0; i < brw->vb.nr_buffers; i++) {

      drm_intel_bo_unreference(brw->vb.buffers[i].bo);

      brw->vb.buffers[i].bo = NULL;

   }

   brw->vb.nr_buffers = 0;

   for (i = 0; i < brw->vb.nr_enabled; i++) {

      brw->vb.enabled[i]->buffer = -1;

   }

   brw->vb.nr_enabled = 0;

   drm_intel_bo_unreference(brw->ib.bo);

   brw->ib.bo = NULL;

}