Пример #1
0
static void
upload_clip_state(struct brw_context *brw)
{
   struct gl_context *ctx = &brw->ctx;
   /* BRW_NEW_META_IN_PROGRESS */
   uint32_t dw1 = brw->meta_in_progress ? 0 : GEN6_CLIP_STATISTICS_ENABLE;
   uint32_t dw2 = 0;

   /* _NEW_BUFFERS */
   struct gl_framebuffer *fb = ctx->DrawBuffer;

   /* BRW_NEW_FS_PROG_DATA */
   if (brw->wm.prog_data->barycentric_interp_modes &
       BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) {
      dw2 |= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
   }

   dw1 |= brw->vs.prog_data->base.cull_distance_mask;

   if (brw->gen >= 7)
      dw1 |= GEN7_CLIP_EARLY_CULL;

   if (brw->gen == 7) {
      /* _NEW_POLYGON */
      if (ctx->Polygon._FrontBit == _mesa_is_user_fbo(fb))
         dw1 |= GEN7_CLIP_WINDING_CCW;

      if (ctx->Polygon.CullFlag) {
         switch (ctx->Polygon.CullFaceMode) {
         case GL_FRONT:
            dw1 |= GEN7_CLIP_CULLMODE_FRONT;
            break;
         case GL_BACK:
            dw1 |= GEN7_CLIP_CULLMODE_BACK;
            break;
         case GL_FRONT_AND_BACK:
            dw1 |= GEN7_CLIP_CULLMODE_BOTH;
            break;
         default:
            unreachable("Should not get here: invalid CullFlag");
         }
      } else {
         dw1 |= GEN7_CLIP_CULLMODE_NONE;
      }
   }

   if (brw->gen < 8 && !ctx->Transform.DepthClamp)
      dw2 |= GEN6_CLIP_Z_TEST;

   /* _NEW_LIGHT */
   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
      dw2 |=
	 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
	 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
	 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
   } else {
      dw2 |=
	 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
	 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
	 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
   }

   /* _NEW_TRANSFORM */
   dw2 |= (ctx->Transform.ClipPlanesEnabled <<
           GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT);
   if (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE)
      dw2 |= GEN6_CLIP_API_D3D;
   else
      dw2 |= GEN6_CLIP_API_OGL;

   dw2 |= GEN6_CLIP_GB_TEST;

   /* We need to disable guardband clipping if the guardband (which we always
    * program to the maximum screen-space bounding box of 8K x 8K) will be
    * smaller than the viewport.
    *
    * Closely examining the clip determination formulas in the documentation
    * reveals that objects will be discarded entirely if they're outside the
    * (small) guardband, even if they're within the (large) viewport:
    *
    *     TR = TR_GB || TR_VPXY || TR_VPZ || TR_UC || TR_NEGW
    *     TA   = !TR && TA_GB && TA_VPZ && TA_NEGW
    *     MC = !(TA || TR)
    *
    * (TA is "Trivial Accept", TR is "Trivial Reject", MC is "Must Clip".)
    *
    * Disabling guardband clipping removes the TR_GB condition, which means
    * they'll be considered MC ("Must Clip") unless they're rejected for
    * some other reason.
    *
    * Note that there is no TA_VPXY condition.  If there were, objects entirely
    * inside a 16384x16384 viewport would be trivially accepted, breaking the
    * "objects must have a screenspace bounding box not exceeding 8K in the X
    * or Y direction" restriction.  Instead, they're clipped.
    */
   for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
      if (ctx->ViewportArray[i].Width > 8192 ||
          ctx->ViewportArray[i].Height > 8192) {
         dw2 &= ~GEN6_CLIP_GB_TEST;
         break;
      }
   }

   /* If the viewport dimensions are smaller than the drawable dimensions,
    * we have to disable guardband clipping prior to Gen8.  We always program
    * the guardband to a fixed size, which is almost always larger than the
    * viewport.  Any geometry which intersects the viewport but lies within
    * the guardband would bypass the 3D clipping stage, so it wouldn't be
    * clipped to the viewport.  Rendering would happen beyond the viewport,
    * but still inside the drawable.
    *
    * Gen8+ introduces a viewport extents test which restricts rendering to
    * the viewport, so we can ignore this restriction.
    */
   if (brw->gen < 8) {
      const float fb_width = (float)_mesa_geometric_width(fb);
      const float fb_height = (float)_mesa_geometric_height(fb);

      for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
         if (ctx->ViewportArray[i].X != 0 ||
             ctx->ViewportArray[i].Y != 0 ||
             ctx->ViewportArray[i].Width != fb_width ||
             ctx->ViewportArray[i].Height != fb_height) {
            dw2 &= ~GEN6_CLIP_GB_TEST;
            break;
         }
      }
   }

   /* BRW_NEW_RASTERIZER_DISCARD */
   if (ctx->RasterDiscard) {
      dw2 |= GEN6_CLIP_MODE_REJECT_ALL;
      if (brw->gen == 6) {
         perf_debug("Rasterizer discard is currently implemented via the "
                    "clipper; having the GS not write primitives would "
                    "likely be faster.\n");
      }
   }

   uint32_t enable;
   if (brw->primitive == _3DPRIM_RECTLIST)
      enable = 0;
   else
      enable = GEN6_CLIP_ENABLE;

   if (!is_drawing_points(brw) && !is_drawing_lines(brw))
      dw2 |= GEN6_CLIP_XY_TEST;

   /* BRW_NEW_VUE_MAP_GEOM_OUT */
   const int max_vp_index =
      (brw->vue_map_geom_out.slots_valid & VARYING_BIT_VIEWPORT) != 0 ?
      ctx->Const.MaxViewports : 1;

   BEGIN_BATCH(4);
   OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
   OUT_BATCH(dw1);
   OUT_BATCH(enable |
	     GEN6_CLIP_MODE_NORMAL |
	     dw2);
   OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
             U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
             (_mesa_geometric_layers(fb) > 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX) |
             ((max_vp_index - 1) & GEN6_CLIP_MAX_VP_INDEX_MASK));
   ADVANCE_BATCH();
}
Пример #2
0
static void
upload_sf_state(struct brw_context *brw)
{
   struct gl_context *ctx = &brw->ctx;
   uint32_t dw1, dw2, dw3;
   float point_size;
   /* _NEW_BUFFERS */
   bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
   const bool multisampled_fbo = _mesa_geometric_samples(ctx->DrawBuffer) > 1;

   dw1 = GEN6_SF_STATISTICS_ENABLE;

   if (brw->sf.viewport_transform_enable)
       dw1 |= GEN6_SF_VIEWPORT_TRANSFORM_ENABLE;

   /* _NEW_BUFFERS */
   dw1 |= (brw_depthbuffer_format(brw) << GEN7_SF_DEPTH_BUFFER_SURFACE_FORMAT_SHIFT);

   /* _NEW_POLYGON */
   if (ctx->Polygon._FrontBit == render_to_fbo)
      dw1 |= GEN6_SF_WINDING_CCW;

   if (ctx->Polygon.OffsetFill)
       dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;

   if (ctx->Polygon.OffsetLine)
       dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;

   if (ctx->Polygon.OffsetPoint)
       dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;

   switch (ctx->Polygon.FrontMode) {
   case GL_FILL:
       dw1 |= GEN6_SF_FRONT_SOLID;
       break;

   case GL_LINE:
       dw1 |= GEN6_SF_FRONT_WIREFRAME;
       break;

   case GL_POINT:
       dw1 |= GEN6_SF_FRONT_POINT;
       break;

   default:
       unreachable("not reached");
   }

   switch (ctx->Polygon.BackMode) {
   case GL_FILL:
       dw1 |= GEN6_SF_BACK_SOLID;
       break;

   case GL_LINE:
       dw1 |= GEN6_SF_BACK_WIREFRAME;
       break;

   case GL_POINT:
       dw1 |= GEN6_SF_BACK_POINT;
       break;

   default:
       unreachable("not reached");
   }

   dw2 = 0;

   if (ctx->Polygon.CullFlag) {
      switch (ctx->Polygon.CullFaceMode) {
      case GL_FRONT:
	 dw2 |= GEN6_SF_CULL_FRONT;
	 break;
      case GL_BACK:
	 dw2 |= GEN6_SF_CULL_BACK;
	 break;
      case GL_FRONT_AND_BACK:
	 dw2 |= GEN6_SF_CULL_BOTH;
	 break;
      default:
	 unreachable("not reached");
      }
   } else {
      dw2 |= GEN6_SF_CULL_NONE;
   }

   /* _NEW_SCISSOR _NEW_POLYGON BRW_NEW_GEOMETRY_PROGRAM BRW_NEW_PRIMITIVE */
   if (ctx->Scissor.EnableFlags ||
       is_drawing_points(brw) || is_drawing_lines(brw))
      dw2 |= GEN6_SF_SCISSOR_ENABLE;

   /* _NEW_LINE */
   {
      uint32_t line_width_u3_7 = brw_get_line_width(brw);
      dw2 |= line_width_u3_7 << GEN6_SF_LINE_WIDTH_SHIFT;
   }
   if (ctx->Line.SmoothFlag) {
      dw2 |= GEN6_SF_LINE_AA_ENABLE;
      dw2 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
   }
   if (ctx->Line.StippleFlag && brw->is_haswell) {
      dw2 |= HSW_SF_LINE_STIPPLE_ENABLE;
   }
   /* _NEW_MULTISAMPLE */
   if (multisampled_fbo && ctx->Multisample.Enabled)
      dw2 |= GEN6_SF_MSRAST_ON_PATTERN;

   /* FINISHME: Last Pixel Enable?  Vertex Sub Pixel Precision Select?
    */

   dw3 = GEN6_SF_LINE_AA_MODE_TRUE;

   /* _NEW_PROGRAM | _NEW_POINT */
   if (!(ctx->VertexProgram.PointSizeEnabled || ctx->Point._Attenuated))
      dw3 |= GEN6_SF_USE_STATE_POINT_WIDTH;

   /* Clamp to ARB_point_parameters user limits */
   point_size = CLAMP(ctx->Point.Size, ctx->Point.MinSize, ctx->Point.MaxSize);

   /* Clamp to the hardware limits and convert to fixed point */
   dw3 |= U_FIXED(CLAMP(point_size, 0.125f, 255.875f), 3);

   /* _NEW_LIGHT */
   if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
      dw3 |=
	 (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
	 (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
	 (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
   } else {
      dw3 |= (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
   }

   BEGIN_BATCH(7);
   OUT_BATCH(_3DSTATE_SF << 16 | (7 - 2));
   OUT_BATCH(dw1);
   OUT_BATCH(dw2);
   OUT_BATCH(dw3);
   OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
   OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
   OUT_BATCH_F(ctx->Polygon.OffsetClamp); /* global depth offset clamp */
   ADVANCE_BATCH();
}