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 static 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 (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(i))
  58          attr_index++;
  59    }
  60
  61    assert(attr_index < 32);
  62
  63    if (two_side_color) {
  64        if ((brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL1)) &&
  65            (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC1))) {
  66            assert(brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL0));
  67            assert(brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC0));
  68            bfc = 2;
  69        } else if ((brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_COL0)) &&
  70                 (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(VERT_RESULT_BFC0)))
  71            bfc = 1;
  72    }
  73
  74    if (bfc && (fs_attr <= FRAG_ATTRIB_TEX7 && fs_attr > FRAG_ATTRIB_WPOS)) {
  75        if (fs_attr == FRAG_ATTRIB_COL0)
  76            attr_index |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
  77        else if (fs_attr == FRAG_ATTRIB_COL1 && bfc == 2) {
  78            attr_index++;
  79            attr_index |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
  80        } else {
  81            attr_index += bfc;
  82        }
  83    }
  84
  85    return attr_index;
  86 }
  87
  88 static void
  89 upload_sf_state(struct brw_context *brw)
  90 {
  91    struct intel_context *intel = &brw->intel;
  92    struct gl_context *ctx = &intel->ctx;
  93    /* CACHE_NEW_VS_PROG */
  94    uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
  95    /* BRW_NEW_FRAGMENT_PROGRAM */
  96    uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
  97    uint32_t dw1, dw2, dw3, dw4, dw16, dw17;
  98    int i;
  99    /* _NEW_BUFFER */
 100    GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
 101    int attr = 0;
 102    int urb_start;
 103    int two_side_color = (ctx->Light.Enabled && ctx->Light.Model.TwoSide);
 104
 105    /* _NEW_TRANSFORM */
 106    if (ctx->Transform.ClipPlanesEnabled)
 107       urb_start = 2;
 108    else
 109       urb_start = 1;
 110
 111    dw1 =
 112       GEN6_SF_SWIZZLE_ENABLE |
 113       num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
 114       (num_inputs + 1) / 2 << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
 115       urb_start << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
 116    dw2 = GEN6_SF_VIEWPORT_TRANSFORM_ENABLE |
 117       GEN6_SF_STATISTICS_ENABLE;
 118    dw3 = 0;
 119    dw4 = 0;
 120    dw16 = 0;
 121    dw17 = 0;
 122
 123    /* _NEW_POLYGON */
 124    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
 125       dw2 |= GEN6_SF_WINDING_CCW;
 126
 127    if (ctx->Polygon.OffsetFill)
 128        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
 129
 130    if (ctx->Polygon.OffsetLine)
 131        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;
 132
 133    if (ctx->Polygon.OffsetPoint)
 134        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;
 135
 136    switch (ctx->Polygon.FrontMode) {
 137    case GL_FILL:
 138        dw2 |= GEN6_SF_FRONT_SOLID;
 139        break;
 140
 141    case GL_LINE:
 142        dw2 |= GEN6_SF_FRONT_WIREFRAME;
 143        break;
 144
 145    case GL_POINT:
 146        dw2 |= GEN6_SF_FRONT_POINT;
 147        break;
 148
 149    default:
 150        assert(0);
 151        break;
 152    }
 153
 154    switch (ctx->Polygon.BackMode) {
 155    case GL_FILL:
 156        dw2 |= GEN6_SF_BACK_SOLID;
 157        break;
 158
 159    case GL_LINE:
 160        dw2 |= GEN6_SF_BACK_WIREFRAME;
 161        break;
 162
 163    case GL_POINT:
 164        dw2 |= GEN6_SF_BACK_POINT;
 165        break;
 166
 167    default:
 168        assert(0);
 169        break;
 170    }
 171
 172    /* _NEW_SCISSOR */
 173    if (ctx->Scissor.Enabled)
 174       dw3 |= GEN6_SF_SCISSOR_ENABLE;
 175
 176    /* _NEW_POLYGON */
 177    if (ctx->Polygon.CullFlag) {
 178       switch (ctx->Polygon.CullFaceMode) {
 179       case GL_FRONT:
 180          dw3 |= GEN6_SF_CULL_FRONT;
 181          break;
 182       case GL_BACK:
 183          dw3 |= GEN6_SF_CULL_BACK;
 184          break;
 185       case GL_FRONT_AND_BACK:
 186          dw3 |= GEN6_SF_CULL_BOTH;
 187          break;
 188       default:
 189          assert(0);
 190          break;
 191       }
 192    } else {
 193       dw3 |= GEN6_SF_CULL_NONE;
 194    }
 195
 196    /* _NEW_LINE */
 197    dw3 |= U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7) <<
 198       GEN6_SF_LINE_WIDTH_SHIFT;
 199    if (ctx->Line.SmoothFlag) {
 200       dw3 |= GEN6_SF_LINE_AA_ENABLE;
 201       dw3 |= GEN6_SF_LINE_AA_MODE_TRUE;
 202       dw3 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
 203    }
 204
 205    /* _NEW_POINT */
 206    if (!(ctx->VertexProgram.PointSizeEnabled ||
 207          ctx->Point._Attenuated))
 208       dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
 209
 210    dw4 |= U_FIXED(CLAMP(ctx->Point.Size, 0.125, 225.875), 3) <<
 211       GEN6_SF_POINT_WIDTH_SHIFT;
 212    if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
 213       dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
 214
 215    /* _NEW_LIGHT */
 216    if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
 217       dw4 |=
 218          (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
 219          (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
 220          (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
 221    } else {
 222       dw4 |=
 223          (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
 224    }
 225
 226    if (ctx->Point.PointSprite) {
 227        for (i = 0; i < 8; i++) {
 228            if (ctx->Point.CoordReplace[i])
 229                dw16 |= (1 << i);
 230        }
 231    }
 232
 233    /* flat shading */
 234    if (ctx->Light.ShadeModel == GL_FLAT) {
 235        dw17 |= ((brw->fragment_program->Base.InputsRead & (FRAG_BIT_COL0 | FRAG_BIT_COL1)) >>
 236                 ((brw->fragment_program->Base.InputsRead & FRAG_BIT_WPOS) ? 0 : 1));
 237    }
 238
 239    BEGIN_BATCH(20);
 240    OUT_BATCH(CMD_3D_SF_STATE << 16 | (20 - 2));
 241    OUT_BATCH(dw1);
 242    OUT_BATCH(dw2);
 243    OUT_BATCH(dw3);
 244    OUT_BATCH(dw4);
 245    OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
 246    OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
 247    OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
 248    for (i = 0; i < 8; i++) {
 249       uint32_t attr_overrides = 0;
 250
 251       for (; attr < 64; attr++) {
 252          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 253             attr_overrides |= get_attr_override(brw, attr, two_side_color);
 254             attr++;
 255             break;
 256          }
 257       }
 258
 259       for (; attr < 64; attr++) {
 260          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 261             attr_overrides |= get_attr_override(brw, attr, two_side_color) << 16;
 262             attr++;
 263             break;
 264          }
 265       }
 266       OUT_BATCH(attr_overrides);
 267    }
 268    OUT_BATCH(dw16); /* point sprite texcoord bitmask */
 269    OUT_BATCH(dw17); /* constant interp bitmask */
 270    OUT_BATCH(0); /* wrapshortest enables 0-7 */
 271    OUT_BATCH(0); /* wrapshortest enables 8-15 */
 272    ADVANCE_BATCH();
 273 }
 274
 275 const struct brw_tracked_state gen6_sf_state = {
 276    .dirty = {
 277       .mesa  = (_NEW_LIGHT |
 278                 _NEW_POLYGON |
 279                 _NEW_LINE |
 280                 _NEW_SCISSOR |
 281                 _NEW_BUFFERS |
 282                 _NEW_POINT |
 283                 _NEW_TRANSFORM),
 284       .brw   = (BRW_NEW_CONTEXT |
 285                 BRW_NEW_FRAGMENT_PROGRAM),
 286       .cache = CACHE_NEW_VS_PROG
 287    },
 288    .emit = upload_sf_state,
 289 };