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)
  37 {
  38    int attr_index = 0, i, vs_attr;
  39
  40    if (fs_attr <= FRAG_ATTRIB_TEX7)
  41       vs_attr = fs_attr;
  42    else if (fs_attr == FRAG_ATTRIB_FACE)
  43       vs_attr = 0; /* XXX */
  44    else if (fs_attr == FRAG_ATTRIB_PNTC)
  45       vs_attr = 0; /* XXX */
  46    else {
  47       assert(fs_attr >= FRAG_ATTRIB_VAR0);
  48       vs_attr = fs_attr - FRAG_ATTRIB_VAR0 + VERT_RESULT_VAR0;
  49    }
  50
  51    /* Find the source index (0 = first attribute after the 4D position)
  52     * for this output attribute.  attr is currently a VERT_RESULT_* but should
  53     * be FRAG_ATTRIB_*.
  54     */
  55    for (i = 1; i < vs_attr; i++) {
  56       if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(i))
  57          attr_index++;
  58    }
  59
  60    return attr_index;
  61 }
  62
  63 static void
  64 upload_sf_state(struct brw_context *brw)
  65 {
  66    struct intel_context *intel = &brw->intel;
  67    struct gl_context *ctx = &intel->ctx;
  68    /* CACHE_NEW_VS_PROG */
  69    uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
  70    /* BRW_NEW_FRAGMENT_PROGRAM */
  71    uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
  72    uint32_t dw1, dw2, dw3, dw4, dw16;
  73    int i;
  74    /* _NEW_BUFFER */
  75    GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
  76    int attr = 0;
  77    int urb_start;
  78
  79    /* _NEW_TRANSFORM */
  80    if (ctx->Transform.ClipPlanesEnabled)
  81       urb_start = 2;
  82    else
  83       urb_start = 1;
  84
  85    dw1 =
  86       GEN6_SF_SWIZZLE_ENABLE |
  87       num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
  88       (num_inputs + 1) / 2 << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
  89       urb_start << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
  90    dw2 = GEN6_SF_VIEWPORT_TRANSFORM_ENABLE |
  91       GEN6_SF_STATISTICS_ENABLE;
  92    dw3 = 0;
  93    dw4 = 0;
  94    dw16 = 0;
  95
  96    /* _NEW_POLYGON */
  97    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
  98       dw2 |= GEN6_SF_WINDING_CCW;
  99
 100    if (ctx->Polygon.OffsetFill)
 101        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
 102
 103    if (ctx->Polygon.OffsetLine)
 104        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;
 105
 106    if (ctx->Polygon.OffsetPoint)
 107        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;
 108
 109    switch (ctx->Polygon.FrontMode) {
 110    case GL_FILL:
 111        dw2 |= GEN6_SF_FRONT_SOLID;
 112        break;
 113
 114    case GL_LINE:
 115        dw2 |= GEN6_SF_FRONT_WIREFRAME;
 116        break;
 117
 118    case GL_POINT:
 119        dw2 |= GEN6_SF_FRONT_POINT;
 120        break;
 121
 122    default:
 123        assert(0);
 124        break;
 125    }
 126
 127    switch (ctx->Polygon.BackMode) {
 128    case GL_FILL:
 129        dw2 |= GEN6_SF_BACK_SOLID;
 130        break;
 131
 132    case GL_LINE:
 133        dw2 |= GEN6_SF_BACK_WIREFRAME;
 134        break;
 135
 136    case GL_POINT:
 137        dw2 |= GEN6_SF_BACK_POINT;
 138        break;
 139
 140    default:
 141        assert(0);
 142        break;
 143    }
 144
 145    /* _NEW_SCISSOR */
 146    if (ctx->Scissor.Enabled)
 147       dw3 |= GEN6_SF_SCISSOR_ENABLE;
 148
 149    /* _NEW_POLYGON */
 150    if (ctx->Polygon.CullFlag) {
 151       switch (ctx->Polygon.CullFaceMode) {
 152       case GL_FRONT:
 153          dw3 |= GEN6_SF_CULL_FRONT;
 154          break;
 155       case GL_BACK:
 156          dw3 |= GEN6_SF_CULL_BACK;
 157          break;
 158       case GL_FRONT_AND_BACK:
 159          dw3 |= GEN6_SF_CULL_BOTH;
 160          break;
 161       default:
 162          assert(0);
 163          break;
 164       }
 165    } else {
 166       dw3 |= GEN6_SF_CULL_NONE;
 167    }
 168
 169    /* _NEW_LINE */
 170    dw3 |= U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7) <<
 171       GEN6_SF_LINE_WIDTH_SHIFT;
 172    if (ctx->Line.SmoothFlag) {
 173       dw3 |= GEN6_SF_LINE_AA_ENABLE;
 174       dw3 |= GEN6_SF_LINE_AA_MODE_TRUE;
 175       dw3 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
 176    }
 177
 178    /* _NEW_POINT */
 179    if (!(ctx->VertexProgram.PointSizeEnabled ||
 180          ctx->Point._Attenuated))
 181       dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
 182
 183    dw4 |= U_FIXED(CLAMP(ctx->Point.Size, 0.125, 225.875), 3) <<
 184       GEN6_SF_POINT_WIDTH_SHIFT;
 185    if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
 186       dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
 187
 188    /* _NEW_LIGHT */
 189    if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
 190       dw4 |=
 191          (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
 192          (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
 193          (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
 194    } else {
 195       dw4 |=
 196          (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
 197    }
 198
 199    if (ctx->Point.PointSprite) {
 200        for (i = 0; i < 8; i++) {
 201            if (ctx->Point.CoordReplace[i])
 202                dw16 |= (1 << i);
 203        }
 204    }
 205
 206    BEGIN_BATCH(20);
 207    OUT_BATCH(CMD_3D_SF_STATE << 16 | (20 - 2));
 208    OUT_BATCH(dw1);
 209    OUT_BATCH(dw2);
 210    OUT_BATCH(dw3);
 211    OUT_BATCH(dw4);
 212    OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
 213    OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
 214    OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
 215    for (i = 0; i < 8; i++) {
 216       uint32_t attr_overrides = 0;
 217
 218       for (; attr < 64; attr++) {
 219          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 220             attr_overrides |= get_attr_override(brw, attr);
 221             attr++;
 222             break;
 223          }
 224       }
 225
 226       for (; attr < 64; attr++) {
 227          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 228             attr_overrides |= get_attr_override(brw, attr) << 16;
 229             attr++;
 230             break;
 231          }
 232       }
 233       OUT_BATCH(attr_overrides);
 234    }
 235    OUT_BATCH(dw16); /* point sprite texcoord bitmask */
 236    OUT_BATCH(0); /* constant interp bitmask */
 237    OUT_BATCH(0); /* wrapshortest enables 0-7 */
 238    OUT_BATCH(0); /* wrapshortest enables 8-15 */
 239    ADVANCE_BATCH();
 240 }
 241
 242 const struct brw_tracked_state gen6_sf_state = {
 243    .dirty = {
 244       .mesa  = (_NEW_LIGHT |
 245                 _NEW_POLYGON |
 246                 _NEW_LINE |
 247                 _NEW_SCISSOR |
 248                 _NEW_BUFFERS |
 249                 _NEW_POINT |
 250                 _NEW_TRANSFORM),
 251       .brw   = (BRW_NEW_CONTEXT |
 252                 BRW_NEW_FRAGMENT_PROGRAM),
 253       .cache = CACHE_NEW_VS_PROG
 254    },
 255    .emit = upload_sf_state,
 256 };