src/mesa/drivers/dri/i965/gen6_wm_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 "brw_wm.h"
  33 #include "program/program.h"
  34 #include "program/prog_parameter.h"
  35 #include "program/prog_statevars.h"
  36 #include "main/shaderapi.h"
  37 #include "main/framebuffer.h"
  38 #include "intel_batchbuffer.h"
  39
  40 static void
  41 gen6_upload_wm_push_constants(struct brw_context *brw)
  42 {
  43    struct brw_stage_state *stage_state = &brw->wm.base;
  44    /* BRW_NEW_FRAGMENT_PROGRAM */
  45    const struct brw_fragment_program *fp =
  46       brw_fragment_program_const(brw->fragment_program);
  47    /* BRW_NEW_FS_PROG_DATA */
  48    const struct brw_stage_prog_data *prog_data = brw->wm.base.prog_data;
  49
  50    _mesa_shader_write_subroutine_indices(&brw->ctx, MESA_SHADER_FRAGMENT);
  51
  52    gen6_upload_push_constants(brw, &fp->program.Base, prog_data,
  53                               stage_state, AUB_TRACE_WM_CONSTANTS);
  54
  55    if (brw->gen >= 7) {
  56       gen7_upload_constant_state(brw, &brw->wm.base, true,
  57                                  _3DSTATE_CONSTANT_PS);
  58    }
  59 }
  60
  61 const struct brw_tracked_state gen6_wm_push_constants = {
  62    .dirty = {
  63       .mesa  = _NEW_PROGRAM_CONSTANTS,
  64       .brw   = BRW_NEW_BATCH |
  65                BRW_NEW_BLORP |
  66                BRW_NEW_FRAGMENT_PROGRAM |
  67                BRW_NEW_FS_PROG_DATA |
  68                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
  69    },
  70    .emit = gen6_upload_wm_push_constants,
  71 };
  72
  73 void
  74 gen6_upload_wm_state(struct brw_context *brw,
  75                      const struct brw_wm_prog_data *prog_data,
  76                      const struct brw_stage_state *stage_state,
  77                      bool multisampled_fbo,
  78                      bool dual_source_blend_enable, bool kill_enable,
  79                      bool color_buffer_write_enable, bool msaa_enabled,
  80                      bool line_stipple_enable, bool polygon_stipple_enable,
  81                      bool statistic_enable)
  82 {
  83    const struct gen_device_info *devinfo = &brw->screen->devinfo;
  84    uint32_t dw2, dw4, dw5, dw6, ksp0, ksp2;
  85
  86    /* We can't fold this into gen6_upload_wm_push_constants(), because
  87     * according to the SNB PRM, vol 2 part 1 section 7.2.2
  88     * (3DSTATE_CONSTANT_PS [DevSNB]):
  89     *
  90     *     "[DevSNB]: This packet must be followed by WM_STATE."
  91     */
  92    if (prog_data->base.nr_params == 0) {
  93       /* Disable the push constant buffers. */
  94       BEGIN_BATCH(5);
  95       OUT_BATCH(_3DSTATE_CONSTANT_PS << 16 | (5 - 2));
  96       OUT_BATCH(0);
  97       OUT_BATCH(0);
  98       OUT_BATCH(0);
  99       OUT_BATCH(0);
 100       ADVANCE_BATCH();
 101    } else {
 102       BEGIN_BATCH(5);
 103       OUT_BATCH(_3DSTATE_CONSTANT_PS << 16 |
 104                 GEN6_CONSTANT_BUFFER_0_ENABLE |
 105                 (5 - 2));
 106       /* Pointer to the WM constant buffer.  Covered by the set of
 107        * state flags from gen6_upload_wm_push_constants.
 108        */
 109       OUT_BATCH(stage_state->push_const_offset +
 110                 stage_state->push_const_size - 1);
 111       OUT_BATCH(0);
 112       OUT_BATCH(0);
 113       OUT_BATCH(0);
 114       ADVANCE_BATCH();
 115    }
 116
 117    dw2 = dw4 = dw5 = dw6 = ksp2 = 0;
 118
 119    if (statistic_enable)
 120       dw4 |= GEN6_WM_STATISTICS_ENABLE;
 121
 122    dw5 |= GEN6_WM_LINE_AA_WIDTH_1_0;
 123    dw5 |= GEN6_WM_LINE_END_CAP_AA_WIDTH_0_5;
 124
 125    if (prog_data->base.use_alt_mode)
 126       dw2 |= GEN6_WM_FLOATING_POINT_MODE_ALT;
 127
 128    dw2 |= (ALIGN(stage_state->sampler_count, 4) / 4) <<
 129            GEN6_WM_SAMPLER_COUNT_SHIFT;
 130
 131    dw2 |= ((prog_data->base.binding_table.size_bytes / 4) <<
 132            GEN6_WM_BINDING_TABLE_ENTRY_COUNT_SHIFT);
 133
 134    dw5 |= (devinfo->max_wm_threads - 1) << GEN6_WM_MAX_THREADS_SHIFT;
 135
 136    if (prog_data->dispatch_8)
 137       dw5 |= GEN6_WM_8_DISPATCH_ENABLE;
 138
 139    if (prog_data->dispatch_16)
 140       dw5 |= GEN6_WM_16_DISPATCH_ENABLE;
 141
 142    dw4 |= prog_data->base.dispatch_grf_start_reg <<
 143           GEN6_WM_DISPATCH_START_GRF_SHIFT_0;
 144    dw4 |= prog_data->dispatch_grf_start_reg_2 <<
 145           GEN6_WM_DISPATCH_START_GRF_SHIFT_2;
 146
 147    ksp0 = stage_state->prog_offset;
 148    ksp2 = stage_state->prog_offset + prog_data->prog_offset_2;
 149
 150    if (dual_source_blend_enable)
 151       dw5 |= GEN6_WM_DUAL_SOURCE_BLEND_ENABLE;
 152
 153    if (line_stipple_enable)
 154       dw5 |= GEN6_WM_LINE_STIPPLE_ENABLE;
 155
 156    if (polygon_stipple_enable)
 157       dw5 |= GEN6_WM_POLYGON_STIPPLE_ENABLE;
 158
 159    if (prog_data->uses_src_depth)
 160       dw5 |= GEN6_WM_USES_SOURCE_DEPTH;
 161    if (prog_data->uses_src_w)
 162       dw5 |= GEN6_WM_USES_SOURCE_W;
 163    if (prog_data->computed_depth_mode != BRW_PSCDEPTH_OFF)
 164       dw5 |= GEN6_WM_COMPUTED_DEPTH;
 165    dw6 |= prog_data->barycentric_interp_modes <<
 166       GEN6_WM_BARYCENTRIC_INTERPOLATION_MODE_SHIFT;
 167
 168    if (kill_enable)
 169       dw5 |= GEN6_WM_KILL_ENABLE;
 170
 171    if (color_buffer_write_enable ||
 172        dw5 & (GEN6_WM_KILL_ENABLE | GEN6_WM_COMPUTED_DEPTH))
 173       dw5 |= GEN6_WM_DISPATCH_ENABLE;
 174
 175    /* From the SNB PRM, volume 2 part 1, page 278:
 176     * "This bit is inserted in the PS payload header and made available to
 177     * the DataPort (either via the message header or via header bypass) to
 178     * indicate that oMask data (one or two phases) is included in Render
 179     * Target Write messages. If present, the oMask data is used to mask off
 180     * samples."
 181     */
 182     if (prog_data->uses_omask)
 183       dw5 |= GEN6_WM_OMASK_TO_RENDER_TARGET;
 184
 185    dw6 |= prog_data->num_varying_inputs <<
 186       GEN6_WM_NUM_SF_OUTPUTS_SHIFT;
 187    if (multisampled_fbo) {
 188       if (msaa_enabled)
 189          dw6 |= GEN6_WM_MSRAST_ON_PATTERN;
 190       else
 191          dw6 |= GEN6_WM_MSRAST_OFF_PIXEL;
 192
 193       if (prog_data->persample_dispatch)
 194          dw6 |= GEN6_WM_MSDISPMODE_PERSAMPLE;
 195       else {
 196          dw6 |= GEN6_WM_MSDISPMODE_PERPIXEL;
 197       }
 198    } else {
 199       dw6 |= GEN6_WM_MSRAST_OFF_PIXEL;
 200       dw6 |= GEN6_WM_MSDISPMODE_PERSAMPLE;
 201    }
 202
 203    /* From the SNB PRM, volume 2 part 1, page 281:
 204     * "If the PS kernel does not need the Position XY Offsets
 205     * to compute a Position XY value, then this field should be
 206     * programmed to POSOFFSET_NONE."
 207     *
 208     * "SW Recommendation: If the PS kernel needs the Position Offsets
 209     * to compute a Position XY value, this field should match Position
 210     * ZW Interpolation Mode to ensure a consistent position.xyzw
 211     * computation."
 212     * We only require XY sample offsets. So, this recommendation doesn't
 213     * look useful at the moment. We might need this in future.
 214     */
 215    if (prog_data->uses_pos_offset)
 216       dw6 |= GEN6_WM_POSOFFSET_SAMPLE;
 217    else
 218       dw6 |= GEN6_WM_POSOFFSET_NONE;
 219
 220    BEGIN_BATCH(9);
 221    OUT_BATCH(_3DSTATE_WM << 16 | (9 - 2));
 222    OUT_BATCH(ksp0);
 223    OUT_BATCH(dw2);
 224    if (prog_data->base.total_scratch) {
 225       OUT_RELOC(stage_state->scratch_bo,
 226                 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
 227                 ffs(stage_state->per_thread_scratch) - 11);
 228    } else {
 229       OUT_BATCH(0);
 230    }
 231    OUT_BATCH(dw4);
 232    OUT_BATCH(dw5);
 233    OUT_BATCH(dw6);
 234    OUT_BATCH(0); /* kernel 1 pointer */
 235    OUT_BATCH(ksp2);
 236    ADVANCE_BATCH();
 237 }
 238
 239 static void
 240 upload_wm_state(struct brw_context *brw)
 241 {
 242    struct gl_context *ctx = &brw->ctx;
 243    /* BRW_NEW_FS_PROG_DATA */
 244    const struct brw_wm_prog_data *prog_data =
 245       brw_wm_prog_data(brw->wm.base.prog_data);
 246
 247    /* _NEW_BUFFERS */
 248    const bool multisampled_fbo = _mesa_geometric_samples(ctx->DrawBuffer) > 1;
 249
 250    /* BRW_NEW_FS_PROG_DATA | _NEW_COLOR */
 251    const bool dual_src_blend_enable = prog_data->dual_src_blend &&
 252                                       (ctx->Color.BlendEnabled & 1) &&
 253                                       ctx->Color.Blend[0]._UsesDualSrc;
 254
 255    /* _NEW_COLOR, _NEW_MULTISAMPLE */
 256    const bool kill_enable = prog_data->uses_kill || ctx->Color.AlphaEnabled ||
 257                             ctx->Multisample.SampleAlphaToCoverage ||
 258                             prog_data->uses_omask;
 259
 260    /* Rendering against the gl-context is always taken into account. */
 261    const bool statistic_enable = true;
 262
 263    /* _NEW_LINE | _NEW_POLYGON | _NEW_BUFFERS | _NEW_COLOR |
 264     * _NEW_MULTISAMPLE
 265     */
 266    gen6_upload_wm_state(brw, prog_data, &brw->wm.base,
 267                         multisampled_fbo,
 268                         dual_src_blend_enable, kill_enable,
 269                         brw_color_buffer_write_enabled(brw),
 270                         ctx->Multisample.Enabled,
 271                         ctx->Line.StippleFlag, ctx->Polygon.StippleFlag,
 272                         statistic_enable);
 273 }
 274
 275 const struct brw_tracked_state gen6_wm_state = {
 276    .dirty = {
 277       .mesa  = _NEW_BUFFERS |
 278                _NEW_COLOR |
 279                _NEW_LINE |
 280                _NEW_MULTISAMPLE |
 281                _NEW_POLYGON |
 282                _NEW_PROGRAM_CONSTANTS,
 283       .brw   = BRW_NEW_BATCH |
 284                BRW_NEW_BLORP |
 285                BRW_NEW_FS_PROG_DATA |
 286                BRW_NEW_PUSH_CONSTANT_ALLOCATION,
 287    },
 288    .emit = upload_wm_state,
 289 };