src/mesa/drivers/dri/i965/gen7_sf_state.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_context.h"
  25 #include "brw_state.h"
  26 #include "brw_defines.h"
  27 #include "brw_util.h"
  28 #include "main/macros.h"
  29 #include "main/fbobject.h"
  30 #include "intel_batchbuffer.h"
  31
  32 static void
  33 upload_sbe_state(struct brw_context *brw)
  34 {
  35    struct gl_context *ctx = &brw->ctx;
  36    /* BRW_NEW_FRAGMENT_PROGRAM */
  37    uint32_t num_outputs = _mesa_bitcount_64(brw->fragment_program->Base.InputsRead);
  38    /* _NEW_LIGHT */
  39    bool shade_model_flat = ctx->Light.ShadeModel == GL_FLAT;
  40    uint32_t dw1, dw10, dw11;
  41    int i;
  42    int attr = 0, input_index = 0;
  43    int urb_entry_read_offset = 1;
  44    uint16_t attr_overrides[VARYING_SLOT_MAX];
  45    /* _NEW_BUFFERS */
  46    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
  47    uint32_t point_sprite_origin;
  48
  49    /* FINISHME: Attribute Swizzle Control Mode? */
  50    dw1 = GEN7_SBE_SWIZZLE_ENABLE | num_outputs << GEN7_SBE_NUM_OUTPUTS_SHIFT;
  51
  52    /* _NEW_POINT
  53     *
  54     * Window coordinates in an FBO are inverted, which means point
  55     * sprite origin must be inverted.
  56     */
  57    if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo) {
  58       point_sprite_origin = GEN6_SF_POINT_SPRITE_LOWERLEFT;
  59    } else {
  60       point_sprite_origin = GEN6_SF_POINT_SPRITE_UPPERLEFT;
  61    }
  62    dw1 |= point_sprite_origin;
  63
  64
  65    dw10 = 0;
  66    dw11 = 0;
  67
  68    /* Create the mapping from the FS inputs we produce to the VS outputs
  69     * they source from.
  70     */
  71    uint32_t max_source_attr = 0;
  72    for (; attr < VARYING_SLOT_MAX; attr++) {
  73       enum glsl_interp_qualifier interp_qualifier =
  74          brw->fragment_program->InterpQualifier[attr];
  75       bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
  76
  77       if (!(brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)))
  78          continue;
  79
  80       if (ctx->Point.PointSprite &&
  81           attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7 &&
  82           ctx->Point.CoordReplace[attr - VARYING_SLOT_TEX0]) {
  83          dw10 |= (1 << input_index);
  84       }
  85
  86       if (attr == VARYING_SLOT_PNTC)
  87          dw10 |= (1 << input_index);
  88
  89       /* flat shading */
  90       if (interp_qualifier == INTERP_QUALIFIER_FLAT ||
  91           (shade_model_flat && is_gl_Color &&
  92            interp_qualifier == INTERP_QUALIFIER_NONE))
  93          dw11 |= (1 << input_index);
  94
  95       /* The hardware can only do the overrides on 16 overrides at a
  96        * time, and the other up to 16 have to be lined up so that the
  97        * input index = the output index.  We'll need to do some
  98        * tweaking to make sure that's the case.
  99        */
 100       assert(input_index < 16 || attr == input_index);
 101
 102       /* BRW_NEW_VUE_MAP_GEOM_OUT | _NEW_LIGHT | _NEW_PROGRAM */
 103       attr_overrides[input_index++] =
 104          get_attr_override(&brw->vue_map_geom_out,
 105                            urb_entry_read_offset, attr,
 106                            ctx->VertexProgram._TwoSideEnabled,
 107                            &max_source_attr);
 108    }
 109
 110    /* From the Ivy Bridge PRM, Volume 2, Part 1, documentation for
 111     * 3DSTATE_SBE DWord 1 bits 15:11, "Vertex URB Entry Read Length":
 112     *
 113     * "This field should be set to the minimum length required to read the
 114     *  maximum source attribute.  The maximum source attribute is indicated
 115     *  by the maximum value of the enabled Attribute # Source Attribute if
 116     *  Attribute Swizzle Enable is set, Number of Output Attributes-1 if
 117     *  enable is not set.
 118     *
 119     *  read_length = ceiling((max_source_attr + 1) / 2)"
 120     */
 121    uint32_t urb_entry_read_length = ALIGN(max_source_attr + 1, 2) / 2;
 122    dw1 |= urb_entry_read_length << GEN7_SBE_URB_ENTRY_READ_LENGTH_SHIFT |
 123           urb_entry_read_offset << GEN7_SBE_URB_ENTRY_READ_OFFSET_SHIFT;
 124
 125    for (; input_index < VARYING_SLOT_MAX; input_index++)
 126       attr_overrides[input_index] = 0;
 127
 128    BEGIN_BATCH(14);
 129    OUT_BATCH(_3DSTATE_SBE << 16 | (14 - 2));
 130    OUT_BATCH(dw1);
 131
 132    /* Output dwords 2 through 9 */
 133    for (i = 0; i < 8; i++) {
 134       OUT_BATCH(attr_overrides[i * 2] | attr_overrides[i * 2 + 1] << 16);
 135    }
 136
 137    OUT_BATCH(dw10); /* point sprite texcoord bitmask */
 138    OUT_BATCH(dw11); /* constant interp bitmask */
 139    OUT_BATCH(0); /* wrapshortest enables 0-7 */
 140    OUT_BATCH(0); /* wrapshortest enables 8-15 */
 141    ADVANCE_BATCH();
 142 }
 143
 144 const struct brw_tracked_state gen7_sbe_state = {
 145    .dirty = {
 146       .mesa  = (_NEW_BUFFERS |
 147                 _NEW_LIGHT |
 148                 _NEW_POINT |
 149                 _NEW_PROGRAM),
 150       .brw   = (BRW_NEW_CONTEXT |
 151                 BRW_NEW_FRAGMENT_PROGRAM |
 152                 BRW_NEW_VUE_MAP_GEOM_OUT)
 153    },
 154    .emit = upload_sbe_state,
 155 };
 156
 157 static void
 158 upload_sf_state(struct brw_context *brw)
 159 {
 160    struct gl_context *ctx = &brw->ctx;
 161    uint32_t dw1, dw2, dw3;
 162    float point_size;
 163    /* _NEW_BUFFERS */
 164    bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 165    bool multisampled_fbo = ctx->DrawBuffer->Visual.samples > 1;
 166
 167    dw1 = GEN6_SF_STATISTICS_ENABLE |
 168          GEN6_SF_VIEWPORT_TRANSFORM_ENABLE;
 169
 170    /* _NEW_BUFFERS */
 171    dw1 |= (brw_depthbuffer_format(brw) << GEN7_SF_DEPTH_BUFFER_SURFACE_FORMAT_SHIFT);
 172
 173    /* _NEW_POLYGON */
 174    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
 175       dw1 |= GEN6_SF_WINDING_CCW;
 176
 177    if (ctx->Polygon.OffsetFill)
 178        dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
 179
 180    if (ctx->Polygon.OffsetLine)
 181        dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;
 182
 183    if (ctx->Polygon.OffsetPoint)
 184        dw1 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;
 185
 186    switch (ctx->Polygon.FrontMode) {
 187    case GL_FILL:
 188        dw1 |= GEN6_SF_FRONT_SOLID;
 189        break;
 190
 191    case GL_LINE:
 192        dw1 |= GEN6_SF_FRONT_WIREFRAME;
 193        break;
 194
 195    case GL_POINT:
 196        dw1 |= GEN6_SF_FRONT_POINT;
 197        break;
 198
 199    default:
 200        assert(0);
 201        break;
 202    }
 203
 204    switch (ctx->Polygon.BackMode) {
 205    case GL_FILL:
 206        dw1 |= GEN6_SF_BACK_SOLID;
 207        break;
 208
 209    case GL_LINE:
 210        dw1 |= GEN6_SF_BACK_WIREFRAME;
 211        break;
 212
 213    case GL_POINT:
 214        dw1 |= GEN6_SF_BACK_POINT;
 215        break;
 216
 217    default:
 218        assert(0);
 219        break;
 220    }
 221
 222    dw2 = 0;
 223
 224    if (ctx->Polygon.CullFlag) {
 225       switch (ctx->Polygon.CullFaceMode) {
 226       case GL_FRONT:
 227          dw2 |= GEN6_SF_CULL_FRONT;
 228          break;
 229       case GL_BACK:
 230          dw2 |= GEN6_SF_CULL_BACK;
 231          break;
 232       case GL_FRONT_AND_BACK:
 233          dw2 |= GEN6_SF_CULL_BOTH;
 234          break;
 235       default:
 236          assert(0);
 237          break;
 238       }
 239    } else {
 240       dw2 |= GEN6_SF_CULL_NONE;
 241    }
 242
 243    /* _NEW_SCISSOR */
 244    if (ctx->Scissor.Enabled)
 245       dw2 |= GEN6_SF_SCISSOR_ENABLE;
 246
 247    /* _NEW_LINE */
 248    {
 249       uint32_t line_width_u3_7 = U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7);
 250       /* TODO: line width of 0 is not allowed when MSAA enabled */
 251       if (line_width_u3_7 == 0)
 252          line_width_u3_7 = 1;
 253       dw2 |= line_width_u3_7 << GEN6_SF_LINE_WIDTH_SHIFT;
 254    }
 255    if (ctx->Line.SmoothFlag) {
 256       dw2 |= GEN6_SF_LINE_AA_ENABLE;
 257       dw2 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
 258    }
 259    if (ctx->Line.StippleFlag && brw->is_haswell) {
 260       dw2 |= HSW_SF_LINE_STIPPLE_ENABLE;
 261    }
 262    /* _NEW_MULTISAMPLE */
 263    if (multisampled_fbo && ctx->Multisample.Enabled)
 264       dw2 |= GEN6_SF_MSRAST_ON_PATTERN;
 265
 266    /* FINISHME: Last Pixel Enable?  Vertex Sub Pixel Precision Select?
 267     */
 268
 269    dw3 = GEN6_SF_LINE_AA_MODE_TRUE;
 270
 271    /* _NEW_PROGRAM | _NEW_POINT */
 272    if (!(ctx->VertexProgram.PointSizeEnabled || ctx->Point._Attenuated))
 273       dw3 |= GEN6_SF_USE_STATE_POINT_WIDTH;
 274
 275    /* Clamp to ARB_point_parameters user limits */
 276    point_size = CLAMP(ctx->Point.Size, ctx->Point.MinSize, ctx->Point.MaxSize);
 277
 278    /* Clamp to the hardware limits and convert to fixed point */
 279    dw3 |= U_FIXED(CLAMP(point_size, 0.125, 255.875), 3);
 280
 281    /* _NEW_LIGHT */
 282    if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
 283       dw3 |=
 284          (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
 285          (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
 286          (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
 287    } else {
 288       dw3 |= (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
 289    }
 290
 291    BEGIN_BATCH(7);
 292    OUT_BATCH(_3DSTATE_SF << 16 | (7 - 2));
 293    OUT_BATCH(dw1);
 294    OUT_BATCH(dw2);
 295    OUT_BATCH(dw3);
 296    OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
 297    OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
 298    OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
 299    ADVANCE_BATCH();
 300 }
 301
 302 const struct brw_tracked_state gen7_sf_state = {
 303    .dirty = {
 304       .mesa  = (_NEW_LIGHT |
 305                 _NEW_PROGRAM |
 306                 _NEW_POLYGON |
 307                 _NEW_LINE |
 308                 _NEW_SCISSOR |
 309                 _NEW_BUFFERS |
 310                 _NEW_POINT |
 311                 _NEW_MULTISAMPLE),
 312       .brw   = BRW_NEW_CONTEXT,
 313       .cache = CACHE_NEW_VS_PROG
 314    },
 315    .emit = upload_sf_state,
 316 };