src/mesa/drivers/dri/i965/gen6_sf_state.c

   1 /*
   2  * Copyright © 2009 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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "brw_context.h"
  29 #include "brw_state.h"
  30 #include "brw_defines.h"
  31 #include "brw_util.h"
  32 #include "main/macros.h"
  33 #include "intel_batchbuffer.h"
  34
  35 uint32_t
  36 get_attr_override(struct brw_context *brw, int fs_attr, int two_side_color)
  37 {
  38    int attr_index = 0, i, vs_attr;
  39    int bfc = 0;
  40
  41    if (fs_attr <= FRAG_ATTRIB_TEX7)
  42       vs_attr = fs_attr;
  43    else if (fs_attr == FRAG_ATTRIB_FACE)
  44       vs_attr = 0; /* XXX */
  45    else if (fs_attr == FRAG_ATTRIB_PNTC)
  46       vs_attr = 0; /* XXX */
  47    else {
  48       assert(fs_attr >= FRAG_ATTRIB_VAR0);
  49       vs_attr = fs_attr - FRAG_ATTRIB_VAR0 + VERT_RESULT_VAR0;
  50    }
  51
  52    /* Find the source index (0 = first attribute after the 4D position)
  53     * for this output attribute.  attr is currently a VERT_RESULT_* but should
  54     * be FRAG_ATTRIB_*.
  55     */
  56    for (i = 1; i < vs_attr; i++) {
  57       if (i == VERT_RESULT_PSIZ)
  58          continue;
  59       if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(i))
  60          attr_index++;
  61    }
  62
  63    assert(attr_index < 32);
  64
  65    if (two_side_color) {
  66        if ((brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL1)) &&
  67            (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC1))) {
  68            assert(brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL0));
  69            assert(brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC0));
  70            bfc = 2;
  71        } else if ((brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL0)) &&
  72                 (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC0)))
  73            bfc = 1;
  74    }
  75
  76    if (bfc && (fs_attr <= FRAG_ATTRIB_TEX7 && fs_attr > FRAG_ATTRIB_WPOS)) {
  77        if (fs_attr == FRAG_ATTRIB_COL0)
  78            attr_index |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
  79        else if (fs_attr == FRAG_ATTRIB_COL1 && bfc == 2) {
  80            attr_index++;
  81            attr_index |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
  82        } else {
  83            attr_index += bfc;
  84        }
  85    }
  86
  87    return attr_index;
  88 }
  89
  90 static void
  91 upload_sf_state(struct brw_context *brw)
  92 {
  93    struct intel_context *intel = &brw->intel;
  94    struct gl_context *ctx = &intel->ctx;
  95    /* CACHE_NEW_VS_PROG */
  96    uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
  97    /* BRW_NEW_FRAGMENT_PROGRAM */
  98    uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
  99    uint32_t dw1, dw2, dw3, dw4, dw16, dw17;
 100    int i;
 101    /* _NEW_BUFFER */
 102    GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
 103    int attr = 0, input_index = 0;
 104    int urb_start;
 105    int two_side_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide);
 106    float point_size;
 107    uint16_t attr_overrides[FRAG_ATTRIB_MAX];
 108
 109    /* _NEW_TRANSFORM */
 110    if (ctx->Transform.ClipPlanesEnabled)
 111       urb_start = 2;
 112    else
 113       urb_start = 1;
 114
 115    dw1 =
 116       GEN6_SF_SWIZZLE_ENABLE |
 117       num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
 118       (num_inputs + 1) / 2 << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
 119       urb_start << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
 120    dw2 = GEN6_SF_VIEWPORT_TRANSFORM_ENABLE |
 121       GEN6_SF_STATISTICS_ENABLE;
 122    dw3 = 0;
 123    dw4 = 0;
 124    dw16 = 0;
 125    dw17 = 0;
 126
 127    /* _NEW_POLYGON */
 128    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
 129       dw2 |= GEN6_SF_WINDING_CCW;
 130
 131    if (ctx->Polygon.OffsetFill)
 132        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
 133
 134    if (ctx->Polygon.OffsetLine)
 135        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;
 136
 137    if (ctx->Polygon.OffsetPoint)
 138        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;
 139
 140    switch (ctx->Polygon.FrontMode) {
 141    case GL_FILL:
 142        dw2 |= GEN6_SF_FRONT_SOLID;
 143        break;
 144
 145    case GL_LINE:
 146        dw2 |= GEN6_SF_FRONT_WIREFRAME;
 147        break;
 148
 149    case GL_POINT:
 150        dw2 |= GEN6_SF_FRONT_POINT;
 151        break;
 152
 153    default:
 154        assert(0);
 155        break;
 156    }
 157
 158    switch (ctx->Polygon.BackMode) {
 159    case GL_FILL:
 160        dw2 |= GEN6_SF_BACK_SOLID;
 161        break;
 162
 163    case GL_LINE:
 164        dw2 |= GEN6_SF_BACK_WIREFRAME;
 165        break;
 166
 167    case GL_POINT:
 168        dw2 |= GEN6_SF_BACK_POINT;
 169        break;
 170
 171    default:
 172        assert(0);
 173        break;
 174    }
 175
 176    /* _NEW_SCISSOR */
 177    if (ctx->Scissor.Enabled)
 178       dw3 |= GEN6_SF_SCISSOR_ENABLE;
 179
 180    /* _NEW_POLYGON */
 181    if (ctx->Polygon.CullFlag) {
 182       switch (ctx->Polygon.CullFaceMode) {
 183       case GL_FRONT:
 184          dw3 |= GEN6_SF_CULL_FRONT;
 185          break;
 186       case GL_BACK:
 187          dw3 |= GEN6_SF_CULL_BACK;
 188          break;
 189       case GL_FRONT_AND_BACK:
 190          dw3 |= GEN6_SF_CULL_BOTH;
 191          break;
 192       default:
 193          assert(0);
 194          break;
 195       }
 196    } else {
 197       dw3 |= GEN6_SF_CULL_NONE;
 198    }
 199
 200    /* _NEW_LINE */
 201    dw3 |= U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7) <<
 202       GEN6_SF_LINE_WIDTH_SHIFT;
 203    if (ctx->Line.SmoothFlag) {
 204       dw3 |= GEN6_SF_LINE_AA_ENABLE;
 205       dw3 |= GEN6_SF_LINE_AA_MODE_TRUE;
 206       dw3 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
 207    }
 208
 209    /* _NEW_POINT */
 210    if (!(ctx->VertexProgram.PointSizeEnabled ||
 211          ctx->Point._Attenuated))
 212       dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
 213
 214    /* Clamp to ARB_point_parameters user limits */
 215    point_size = CLAMP(ctx->Point.Size, ctx->Point.MinSize, ctx->Point.MaxSize);
 216
 217    /* Clamp to the hardware limits and convert to fixed point */
 218    dw4 |= U_FIXED(CLAMP(point_size, 0.125, 255.875), 3);
 219
 220    if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
 221       dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
 222
 223    /* _NEW_LIGHT */
 224    if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
 225       dw4 |=
 226          (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
 227          (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
 228          (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
 229    } else {
 230       dw4 |=
 231          (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
 232    }
 233
 234    /* flat shading */
 235    if (ctx->Light.ShadeModel == GL_FLAT) {
 236        dw17 |= ((brw->fragment_program->Base.InputsRead & (FRAG_BIT_COL0 | FRAG_BIT_COL1)) >>
 237                 ((brw->fragment_program->Base.InputsRead & FRAG_BIT_WPOS) ? 0 : 1));
 238    }
 239
 240    /* Create the mapping from the FS inputs we produce to the VS outputs
 241     * they source from.
 242     */
 243    for (; attr < FRAG_ATTRIB_MAX; attr++) {
 244       if (!(brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)))
 245          continue;
 246
 247       /* _NEW_POINT */
 248       if (ctx->Point.PointSprite &&
 249           (attr >= FRAG_ATTRIB_TEX0 && attr <= FRAG_ATTRIB_TEX7) &&
 250           ctx->Point.CoordReplace[attr - FRAG_ATTRIB_TEX0]) {
 251          dw16 |= (1 << input_index);
 252       }
 253
 254       if (attr == FRAG_ATTRIB_PNTC)
 255          dw16 |= (1 << input_index);
 256
 257       /* The hardware can only do the overrides on 16 overrides at a
 258        * time, and the other up to 16 have to be lined up so that the
 259        * input index = the output index.  We'll need to do some
 260        * tweaking to make sure that's the case.
 261        */
 262       assert(input_index < 16 || attr == input_index);
 263
 264       attr_overrides[input_index++] = get_attr_override(brw, attr,
 265                                                         two_side_color);
 266    }
 267
 268    for (; input_index < FRAG_ATTRIB_MAX; input_index++)
 269       attr_overrides[input_index] = 0;
 270
 271    BEGIN_BATCH(20);
 272    OUT_BATCH(_3DSTATE_SF << 16 | (20 - 2));
 273    OUT_BATCH(dw1);
 274    OUT_BATCH(dw2);
 275    OUT_BATCH(dw3);
 276    OUT_BATCH(dw4);
 277    OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
 278    OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
 279    OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
 280    for (i = 0; i < 8; i++) {
 281       OUT_BATCH(attr_overrides[i * 2] | attr_overrides[i * 2 + 1] << 16);
 282    }
 283    OUT_BATCH(dw16); /* point sprite texcoord bitmask */
 284    OUT_BATCH(dw17); /* constant interp bitmask */
 285    OUT_BATCH(0); /* wrapshortest enables 0-7 */
 286    OUT_BATCH(0); /* wrapshortest enables 8-15 */
 287    ADVANCE_BATCH();
 288 }
 289
 290 const struct brw_tracked_state gen6_sf_state = {
 291    .dirty = {
 292       .mesa  = (_NEW_LIGHT |
 293                 _NEW_POLYGON |
 294                 _NEW_LINE |
 295                 _NEW_SCISSOR |
 296                 _NEW_BUFFERS |
 297                 _NEW_POINT |
 298                 _NEW_TRANSFORM),
 299       .brw   = (BRW_NEW_CONTEXT |
 300                 BRW_NEW_FRAGMENT_PROGRAM),
 301       .cache = CACHE_NEW_VS_PROG
 302    },
 303    .emit = upload_sf_state,
 304 };