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    uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
  71    uint32_t dw1, dw2, dw3, dw4, dw16;
  72    int i;
  73    /* _NEW_BUFFER */
  74    GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
  75    int attr = 0;
  76    int urb_start;
  77
  78    /* _NEW_TRANSFORM */
  79    if (ctx->Transform.ClipPlanesEnabled)
  80       urb_start = 2;
  81    else
  82       urb_start = 1;
  83
  84    dw1 =
  85       GEN6_SF_SWIZZLE_ENABLE |
  86       num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
  87       (num_inputs + 1) / 2 << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
  88       urb_start << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
  89    dw2 = GEN6_SF_VIEWPORT_TRANSFORM_ENABLE |
  90       GEN6_SF_STATISTICS_ENABLE;
  91    dw3 = 0;
  92    dw4 = 0;
  93    dw16 = 0;
  94
  95    /* _NEW_POLYGON */
  96    if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
  97       dw2 |= GEN6_SF_WINDING_CCW;
  98
  99    if (ctx->Polygon.OffsetFill)
 100        dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
 101
 102    /* _NEW_SCISSOR */
 103    if (ctx->Scissor.Enabled)
 104       dw3 |= GEN6_SF_SCISSOR_ENABLE;
 105
 106    /* _NEW_POLYGON */
 107    if (ctx->Polygon.CullFlag) {
 108       switch (ctx->Polygon.CullFaceMode) {
 109       case GL_FRONT:
 110          dw3 |= GEN6_SF_CULL_FRONT;
 111          break;
 112       case GL_BACK:
 113          dw3 |= GEN6_SF_CULL_BACK;
 114          break;
 115       case GL_FRONT_AND_BACK:
 116          dw3 |= GEN6_SF_CULL_BOTH;
 117          break;
 118       default:
 119          assert(0);
 120          break;
 121       }
 122    } else {
 123       dw3 |= GEN6_SF_CULL_NONE;
 124    }
 125
 126    /* _NEW_LINE */
 127    dw3 |= U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7) <<
 128       GEN6_SF_LINE_WIDTH_SHIFT;
 129    if (ctx->Line.SmoothFlag) {
 130       dw3 |= GEN6_SF_LINE_AA_ENABLE;
 131       dw3 |= GEN6_SF_LINE_AA_MODE_TRUE;
 132       dw3 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
 133    }
 134
 135    /* _NEW_POINT */
 136    if (!(ctx->VertexProgram.PointSizeEnabled ||
 137          ctx->Point._Attenuated))
 138       dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
 139
 140    dw4 |= U_FIXED(CLAMP(ctx->Point.Size, 0.125, 225.875), 3) <<
 141       GEN6_SF_POINT_WIDTH_SHIFT;
 142    if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
 143       dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
 144
 145    /* _NEW_LIGHT */
 146    if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
 147       dw4 |=
 148          (2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
 149          (2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
 150          (1 << GEN6_SF_LINE_PROVOKE_SHIFT);
 151    } else {
 152       dw4 |=
 153          (1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
 154    }
 155
 156    if (ctx->Point.PointSprite) {
 157        for (i = 0; i < 8; i++) {
 158            if (ctx->Point.CoordReplace[i])
 159                dw16 |= (1 << i);
 160        }
 161    }
 162
 163    BEGIN_BATCH(20);
 164    OUT_BATCH(CMD_3D_SF_STATE << 16 | (20 - 2));
 165    OUT_BATCH(dw1);
 166    OUT_BATCH(dw2);
 167    OUT_BATCH(dw3);
 168    OUT_BATCH(dw4);
 169    OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant.  copied from gen4 */
 170    OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
 171    OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
 172    for (i = 0; i < 8; i++) {
 173       uint32_t attr_overrides = 0;
 174
 175       for (; attr < 64; attr++) {
 176          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 177             attr_overrides |= get_attr_override(brw, attr);
 178             attr++;
 179             break;
 180          }
 181       }
 182
 183       for (; attr < 64; attr++) {
 184          if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
 185             attr_overrides |= get_attr_override(brw, attr) << 16;
 186             attr++;
 187             break;
 188          }
 189       }
 190       OUT_BATCH(attr_overrides);
 191    }
 192    OUT_BATCH(dw16); /* point sprite texcoord bitmask */
 193    OUT_BATCH(0); /* constant interp bitmask */
 194    OUT_BATCH(0); /* wrapshortest enables 0-7 */
 195    OUT_BATCH(0); /* wrapshortest enables 8-15 */
 196    ADVANCE_BATCH();
 197 }
 198
 199 const struct brw_tracked_state gen6_sf_state = {
 200    .dirty = {
 201       .mesa  = (_NEW_LIGHT |
 202                 _NEW_POLYGON |
 203                 _NEW_LINE |
 204                 _NEW_SCISSOR |
 205                 _NEW_BUFFERS |
 206                 _NEW_POINT |
 207                 _NEW_TRANSFORM),
 208       .brw   = BRW_NEW_CONTEXT,
 209       .cache = CACHE_NEW_VS_PROG
 210    },
 211    .emit = upload_sf_state,
 212 };