src/mesa/drivers/dri/i965/gen6_sol.c

   1 /*
   2  * Copyright © 2011 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
  24 /** \file gen6_sol.c
  25  *
  26  * Code to initialize the binding table entries used by transform feedback.
  27  */
  28
  29 #include "main/macros.h"
  30 #include "brw_context.h"
  31 #include "intel_batchbuffer.h"
  32 #include "brw_defines.h"
  33 #include "brw_state.h"
  34 #include "main/transformfeedback.h"
  35
  36 static void
  37 gen6_update_sol_surfaces(struct brw_context *brw)
  38 {
  39    struct gl_context *ctx = &brw->intel.ctx;
  40    /* _NEW_TRANSFORM_FEEDBACK */
  41    struct gl_transform_feedback_object *xfb_obj =
  42       ctx->TransformFeedback.CurrentObject;
  43    /* BRW_NEW_VERTEX_PROGRAM */
  44    const struct gl_shader_program *shaderprog =
  45       ctx->Shader.CurrentVertexProgram;
  46    const struct gl_transform_feedback_info *linked_xfb_info =
  47       &shaderprog->LinkedTransformFeedback;
  48    int i;
  49
  50    for (i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
  51       const int surf_index = SURF_INDEX_SOL_BINDING(i);
  52       if (_mesa_is_xfb_active_and_unpaused(ctx) &&
  53           i < linked_xfb_info->NumOutputs) {
  54          unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
  55          unsigned buffer_offset =
  56             xfb_obj->Offset[buffer] / 4 +
  57             linked_xfb_info->Outputs[i].DstOffset;
  58          brw_update_sol_surface(
  59             brw, xfb_obj->Buffers[buffer], &brw->gs.surf_offset[surf_index],
  60             linked_xfb_info->Outputs[i].NumComponents,
  61             linked_xfb_info->BufferStride[buffer], buffer_offset);
  62       } else {
  63          brw->gs.surf_offset[surf_index] = 0;
  64       }
  65    }
  66
  67    brw->state.dirty.brw |= BRW_NEW_SURFACES;
  68 }
  69
  70 const struct brw_tracked_state gen6_sol_surface = {
  71    .dirty = {
  72       .mesa = _NEW_TRANSFORM_FEEDBACK,
  73       .brw = (BRW_NEW_BATCH |
  74               BRW_NEW_VERTEX_PROGRAM),
  75       .cache = 0
  76    },
  77    .emit = gen6_update_sol_surfaces,
  78 };
  79
  80 /**
  81  * Constructs the binding table for the WM surface state, which maps unit
  82  * numbers to surface state objects.
  83  */
  84 static void
  85 brw_gs_upload_binding_table(struct brw_context *brw)
  86 {
  87    struct gl_context *ctx = &brw->intel.ctx;
  88    /* BRW_NEW_VERTEX_PROGRAM */
  89    const struct gl_shader_program *shaderprog =
  90       ctx->Shader.CurrentVertexProgram;
  91    bool has_surfaces = false;
  92    uint32_t *bind;
  93
  94    if (shaderprog) {
  95       const struct gl_transform_feedback_info *linked_xfb_info =
  96          &shaderprog->LinkedTransformFeedback;
  97       /* Currently we only ever upload surfaces for SOL. */
  98       has_surfaces = linked_xfb_info->NumOutputs != 0;
  99    }
 100
 101    /* Skip making a binding table if we don't have anything to put in it. */
 102    if (!has_surfaces) {
 103       if (brw->gs.bind_bo_offset != 0) {
 104          brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
 105          brw->gs.bind_bo_offset = 0;
 106       }
 107       return;
 108    }
 109
 110    /* Might want to calculate nr_surfaces first, to avoid taking up so much
 111     * space for the binding table.
 112     */
 113    bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
 114                           sizeof(uint32_t) * BRW_MAX_GS_SURFACES,
 115                           32, &brw->gs.bind_bo_offset);
 116
 117    /* BRW_NEW_SURFACES */
 118    memcpy(bind, brw->gs.surf_offset, BRW_MAX_GS_SURFACES * sizeof(uint32_t));
 119
 120    brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
 121 }
 122
 123 const struct brw_tracked_state gen6_gs_binding_table = {
 124    .dirty = {
 125       .mesa = 0,
 126       .brw = (BRW_NEW_BATCH |
 127               BRW_NEW_VERTEX_PROGRAM |
 128               BRW_NEW_SURFACES),
 129       .cache = 0
 130    },
 131    .emit = brw_gs_upload_binding_table,
 132 };
 133
 134 static void
 135 gen6_update_sol_indices(struct brw_context *brw)
 136 {
 137    struct intel_context *intel = &brw->intel;
 138
 139    BEGIN_BATCH(4);
 140    OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
 141    OUT_BATCH(0);
 142    OUT_BATCH(brw->sol.svbi_0_starting_index); /* BRW_NEW_SOL_INDICES */
 143    OUT_BATCH(brw->sol.svbi_0_max_index); /* BRW_NEW_SOL_INDICES */
 144    ADVANCE_BATCH();
 145 }
 146
 147 const struct brw_tracked_state gen6_sol_indices = {
 148    .dirty = {
 149       .mesa = 0,
 150       .brw = (BRW_NEW_BATCH |
 151               BRW_NEW_SOL_INDICES),
 152       .cache = 0
 153    },
 154    .emit = gen6_update_sol_indices,
 155 };
 156
 157 void
 158 brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 159                              struct gl_transform_feedback_object *obj)
 160 {
 161    struct brw_context *brw = brw_context(ctx);
 162    struct intel_context *intel = &brw->intel;
 163    const struct gl_shader_program *vs_prog =
 164       ctx->Shader.CurrentVertexProgram;
 165    const struct gl_transform_feedback_info *linked_xfb_info =
 166       &vs_prog->LinkedTransformFeedback;
 167    struct gl_transform_feedback_object *xfb_obj =
 168       ctx->TransformFeedback.CurrentObject;
 169
 170    /* Compute the maximum number of vertices that we can write without
 171     * overflowing any of the buffers currently being used for feedback.
 172     */
 173    unsigned max_index
 174       = _mesa_compute_max_transform_feedback_vertices(xfb_obj,
 175                                                       linked_xfb_info);
 176
 177    /* Initialize the SVBI 0 register to zero and set the maximum index.
 178     * These values will be sent to the hardware on the next draw.
 179     */
 180    brw->state.dirty.brw |= BRW_NEW_SOL_INDICES;
 181    brw->sol.svbi_0_starting_index = 0;
 182    brw->sol.svbi_0_max_index = max_index;
 183    brw->sol.offset_0_batch_start = 0;
 184
 185    if (intel->gen >= 7) {
 186       /* Ask the kernel to reset the SO offsets for any previous transform
 187        * feedback, so we start at the start of the user's buffer. (note: these
 188        * are not the query counters)
 189        */
 190       intel->batch.needs_sol_reset = true;
 191    }
 192 }
 193
 194 void
 195 brw_end_transform_feedback(struct gl_context *ctx,
 196                            struct gl_transform_feedback_object *obj)
 197 {
 198    /* After EndTransformFeedback, it's likely that the client program will try
 199     * to draw using the contents of the transform feedback buffer as vertex
 200     * input.  In order for this to work, we need to flush the data through at
 201     * least the GS stage of the pipeline, and flush out the render cache.  For
 202     * simplicity, just do a full flush.
 203     */
 204    struct brw_context *brw = brw_context(ctx);
 205    struct intel_context *intel = &brw->intel;
 206    intel_batchbuffer_emit_mi_flush(intel);
 207 }