src/gallium/auxiliary/draw/draw_pt_so_emit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "draw/draw_private.h"
  29 #include "draw/draw_vs.h"
  30 #include "draw/draw_context.h"
  31 #include "draw/draw_vbuf.h"
  32 #include "draw/draw_vertex.h"
  33 #include "draw/draw_pt.h"
  34
  35 #include "pipe/p_state.h"
  36
  37 #include "util/u_math.h"
  38 #include "util/u_memory.h"
  39
  40 struct pt_so_emit {
  41    struct draw_context *draw;
  42
  43    unsigned input_vertex_stride;
  44    const float (*inputs)[4];
  45
  46    boolean has_so;
  47
  48    unsigned emitted_primitives;
  49    unsigned emitted_vertices;
  50    unsigned generated_primitives;
  51 };
  52
  53
  54 void draw_pt_so_emit_prepare(struct pt_so_emit *emit)
  55 {
  56    struct draw_context *draw = emit->draw;
  57
  58    emit->has_so = (draw->vs.vertex_shader->state.stream_output.num_outputs > 0);
  59
  60    /* if we have a state with outputs make sure we have
  61     * buffers to output to */
  62    if (emit->has_so) {
  63       boolean has_valid_buffer = FALSE;
  64       unsigned i;
  65       for (i = 0; i < draw->so.num_targets; ++i) {
  66          if (draw->so.targets[i]) {
  67             has_valid_buffer = TRUE;
  68             break;
  69          }
  70       }
  71       emit->has_so = has_valid_buffer;
  72    }
  73
  74    if (!emit->has_so)
  75       return;
  76
  77    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
  78     */
  79    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
  80 }
  81
  82 static void so_emit_prim(struct pt_so_emit *so,
  83                          unsigned *indices,
  84                          unsigned num_vertices)
  85 {
  86    unsigned slot, i;
  87    unsigned input_vertex_stride = so->input_vertex_stride;
  88    struct draw_context *draw = so->draw;
  89    const float (*input_ptr)[4];
  90    const struct pipe_stream_output_info *state =
  91       &draw->vs.vertex_shader->state.stream_output;
  92    float *buffer;
  93    int buffer_total_bytes[PIPE_MAX_SO_BUFFERS];
  94
  95    input_ptr = so->inputs;
  96
  97    ++so->generated_primitives;
  98
  99    for (i = 0; i < draw->so.num_targets; i++) {
 100       struct draw_so_target *target = draw->so.targets[i];
 101       buffer_total_bytes[i] = target->internal_offset;
 102    }
 103
 104    /* check have we space to emit prim first - if not don't do anything */
 105    for (i = 0; i < num_vertices; ++i) {
 106       for (slot = 0; slot < state->num_outputs; ++slot) {
 107          unsigned num_comps = state->output[slot].num_components;
 108          int ob = state->output[slot].output_buffer;
 109
 110          if ((buffer_total_bytes[ob] + num_comps * sizeof(float)) >
 111              draw->so.targets[ob]->target.buffer_size) {
 112             return;
 113          }
 114          buffer_total_bytes[ob] += num_comps * sizeof(float);
 115       }
 116    }
 117
 118    for (i = 0; i < num_vertices; ++i) {
 119       const float (*input)[4];
 120       unsigned total_written_compos = 0;
 121       int ob;
 122       /*debug_printf("%d) vertex index = %d (prim idx = %d)\n", i, indices[i], prim_idx);*/
 123       input = (const float (*)[4])(
 124          (const char *)input_ptr + (indices[i] * input_vertex_stride));
 125
 126       for (slot = 0; slot < state->num_outputs; ++slot) {
 127          unsigned idx = state->output[slot].register_index;
 128          unsigned start_comp = state->output[slot].start_component;
 129          unsigned num_comps = state->output[slot].num_components;
 130
 131          ob = state->output[slot].output_buffer;
 132
 133          buffer = (float *)((char *)draw->so.targets[ob]->mapping +
 134                             draw->so.targets[ob]->target.buffer_offset +
 135                             draw->so.targets[ob]->internal_offset) + state->output[slot].dst_offset;
 136          memcpy(buffer, &input[idx][start_comp], num_comps * sizeof(float));
 137          total_written_compos += num_comps;
 138       }
 139       for (ob = 0; ob < draw->so.num_targets; ++ob)
 140          draw->so.targets[ob]->internal_offset += state->stride[ob] * sizeof(float);
 141    }
 142    so->emitted_vertices += num_vertices;
 143    ++so->emitted_primitives;
 144 }
 145
 146 static void so_point(struct pt_so_emit *so, int idx)
 147 {
 148    unsigned indices[1];
 149
 150    indices[0] = idx;
 151
 152    so_emit_prim(so, indices, 1);
 153 }
 154
 155 static void so_line(struct pt_so_emit *so, int i0, int i1)
 156 {
 157    unsigned indices[2];
 158
 159    indices[0] = i0;
 160    indices[1] = i1;
 161
 162    so_emit_prim(so, indices, 2);
 163 }
 164
 165 static void so_tri(struct pt_so_emit *so, int i0, int i1, int i2)
 166 {
 167    unsigned indices[3];
 168
 169    indices[0] = i0;
 170    indices[1] = i1;
 171    indices[2] = i2;
 172
 173    so_emit_prim(so, indices, 3);
 174 }
 175
 176
 177 #define FUNC         so_run_linear
 178 #define GET_ELT(idx) (start + (idx))
 179 #include "draw_so_emit_tmp.h"
 180
 181
 182 #define FUNC         so_run_elts
 183 #define LOCAL_VARS   const ushort *elts = input_prims->elts;
 184 #define GET_ELT(idx) (elts[start + (idx)])
 185 #include "draw_so_emit_tmp.h"
 186
 187
 188 void draw_pt_so_emit( struct pt_so_emit *emit,
 189                       const struct draw_vertex_info *input_verts,
 190                       const struct draw_prim_info *input_prims )
 191 {
 192    struct draw_context *draw = emit->draw;
 193    struct vbuf_render *render = draw->render;
 194    unsigned start, i;
 195
 196    if (!emit->has_so)
 197       return;
 198
 199    if (!draw->so.num_targets)
 200       return;
 201
 202    emit->emitted_vertices = 0;
 203    emit->emitted_primitives = 0;
 204    emit->generated_primitives = 0;
 205    emit->input_vertex_stride = input_verts->stride;
 206    emit->inputs = (const float (*)[4])input_verts->verts->data;
 207
 208    /* XXX: need to flush to get prim_vbuf.c to release its allocation??*/
 209    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 210
 211    for (start = i = 0; i < input_prims->primitive_count;
 212         start += input_prims->primitive_lengths[i], i++)
 213    {
 214       unsigned count = input_prims->primitive_lengths[i];
 215
 216       if (input_prims->linear) {
 217          so_run_linear(emit, input_prims, input_verts,
 218                        start, count);
 219       } else {
 220          so_run_elts(emit, input_prims, input_verts,
 221                      start, count);
 222       }
 223    }
 224
 225    render->set_stream_output_info(render,
 226                                   emit->emitted_primitives,
 227                                   emit->emitted_vertices,
 228                                   emit->generated_primitives);
 229 }
 230
 231
 232 struct pt_so_emit *draw_pt_so_emit_create( struct draw_context *draw )
 233 {
 234    struct pt_so_emit *emit = CALLOC_STRUCT(pt_so_emit);
 235    if (!emit)
 236       return NULL;
 237
 238    emit->draw = draw;
 239
 240    return emit;
 241 }
 242
 243 void draw_pt_so_emit_destroy( struct pt_so_emit *emit )
 244 {
 245    FREE(emit);
 246 }