src/mesa/state_tracker/st_cb_xformfb.c

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   3  * Copyright 2010 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  27
  28
  29 /**
  30  * Transform feedback functions.
  31  *
  32  * \author Brian Paul
  33  *         Marek Olšák
  34  */
  35
  36
  37 #include "main/bufferobj.h"
  38 #include "main/context.h"
  39 #include "main/transformfeedback.h"
  40
  41 #include "st_cb_bufferobjects.h"
  42 #include "st_cb_xformfb.h"
  43 #include "st_context.h"
  44
  45 #include "pipe/p_context.h"
  46 #include "util/u_draw.h"
  47 #include "util/u_inlines.h"
  48 #include "cso_cache/cso_context.h"
  49
  50 struct st_transform_feedback_object {
  51    struct gl_transform_feedback_object base;
  52
  53    unsigned num_targets;
  54    struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
  55
  56    /* This encapsulates the count that can be used as a source for draw_vbo.
  57     * It contains stream output targets from the last call of
  58     * EndTransformFeedback for each stream. */
  59    struct pipe_stream_output_target *draw_count[MAX_VERTEX_STREAMS];
  60 };
  61
  62 static inline struct st_transform_feedback_object *
  63 st_transform_feedback_object(struct gl_transform_feedback_object *obj)
  64 {
  65    return (struct st_transform_feedback_object *) obj;
  66 }
  67
  68 static struct gl_transform_feedback_object *
  69 st_new_transform_feedback(struct gl_context *ctx, GLuint name)
  70 {
  71    struct st_transform_feedback_object *obj;
  72
  73    obj = CALLOC_STRUCT(st_transform_feedback_object);
  74    if (!obj)
  75       return NULL;
  76
  77    _mesa_init_transform_feedback_object(&obj->base, name);
  78
  79    return &obj->base;
  80 }
  81
  82
  83 static void
  84 st_delete_transform_feedback(struct gl_context *ctx,
  85                              struct gl_transform_feedback_object *obj)
  86 {
  87    struct st_transform_feedback_object *sobj =
  88          st_transform_feedback_object(obj);
  89    unsigned i;
  90
  91    for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
  92       pipe_so_target_reference(&sobj->draw_count[i], NULL);
  93
  94    /* Unreference targets. */
  95    for (i = 0; i < sobj->num_targets; i++) {
  96       pipe_so_target_reference(&sobj->targets[i], NULL);
  97    }
  98
  99    _mesa_delete_transform_feedback_object(ctx, obj);
 100 }
 101
 102
 103 /* XXX Do we really need the mode? */
 104 static void
 105 st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 106                             struct gl_transform_feedback_object *obj)
 107 {
 108    struct st_context *st = st_context(ctx);
 109    struct pipe_context *pipe = st->pipe;
 110    struct st_transform_feedback_object *sobj =
 111          st_transform_feedback_object(obj);
 112    unsigned i, max_num_targets;
 113    unsigned offsets[PIPE_MAX_SO_BUFFERS] = {0};
 114
 115    max_num_targets = MIN2(ARRAY_SIZE(sobj->base.Buffers),
 116                           ARRAY_SIZE(sobj->targets));
 117
 118    /* Convert the transform feedback state into the gallium representation. */
 119    for (i = 0; i < max_num_targets; i++) {
 120       struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
 121
 122       if (bo && bo->buffer) {
 123          unsigned stream = obj->program->sh.LinkedTransformFeedback->
 124             Buffers[i].Stream;
 125
 126          /* Check whether we need to recreate the target. */
 127          if (!sobj->targets[i] ||
 128              sobj->targets[i] == sobj->draw_count[stream] ||
 129              sobj->targets[i]->buffer != bo->buffer ||
 130              sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
 131              sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
 132             /* Create a new target. */
 133             struct pipe_stream_output_target *so_target =
 134                   pipe->create_stream_output_target(pipe, bo->buffer,
 135                                                     sobj->base.Offset[i],
 136                                                     sobj->base.Size[i]);
 137
 138             pipe_so_target_reference(&sobj->targets[i], NULL);
 139             sobj->targets[i] = so_target;
 140          }
 141
 142          sobj->num_targets = i+1;
 143       } else {
 144          pipe_so_target_reference(&sobj->targets[i], NULL);
 145       }
 146    }
 147
 148    /* Start writing at the beginning of each target. */
 149    cso_set_stream_outputs(st->cso_context, sobj->num_targets,
 150                           sobj->targets, offsets);
 151 }
 152
 153
 154 static void
 155 st_pause_transform_feedback(struct gl_context *ctx,
 156                            struct gl_transform_feedback_object *obj)
 157 {
 158    struct st_context *st = st_context(ctx);
 159    cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
 160 }
 161
 162
 163 static void
 164 st_resume_transform_feedback(struct gl_context *ctx,
 165                              struct gl_transform_feedback_object *obj)
 166 {
 167    struct st_context *st = st_context(ctx);
 168    struct st_transform_feedback_object *sobj =
 169       st_transform_feedback_object(obj);
 170    unsigned offsets[PIPE_MAX_SO_BUFFERS];
 171    unsigned i;
 172
 173    for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++)
 174       offsets[i] = (unsigned)-1;
 175
 176    cso_set_stream_outputs(st->cso_context, sobj->num_targets,
 177                           sobj->targets, offsets);
 178 }
 179
 180
 181 static void
 182 st_end_transform_feedback(struct gl_context *ctx,
 183                           struct gl_transform_feedback_object *obj)
 184 {
 185    struct st_context *st = st_context(ctx);
 186    struct st_transform_feedback_object *sobj =
 187          st_transform_feedback_object(obj);
 188    unsigned i;
 189
 190    cso_set_stream_outputs(st->cso_context, 0, NULL, NULL);
 191
 192    /* The next call to glDrawTransformFeedbackStream should use the vertex
 193     * count from the last call to glEndTransformFeedback.
 194     * Therefore, save the targets for each stream.
 195     *
 196     * NULL means the vertex counter is 0 (initial state).
 197     */
 198    for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++)
 199       pipe_so_target_reference(&sobj->draw_count[i], NULL);
 200
 201    for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) {
 202       unsigned stream = obj->program->sh.LinkedTransformFeedback->
 203          Buffers[i].Stream;
 204
 205       /* Is it not bound or already set for this stream? */
 206       if (!sobj->targets[i] || sobj->draw_count[stream])
 207          continue;
 208
 209       pipe_so_target_reference(&sobj->draw_count[stream], sobj->targets[i]);
 210    }
 211 }
 212
 213
 214 bool
 215 st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
 216                                 unsigned stream, struct pipe_draw_info *out)
 217 {
 218    struct st_transform_feedback_object *sobj =
 219          st_transform_feedback_object(obj);
 220
 221    out->count_from_stream_output = sobj->draw_count[stream];
 222    return out->count_from_stream_output != NULL;
 223 }
 224
 225
 226 void
 227 st_init_xformfb_functions(struct dd_function_table *functions)
 228 {
 229    functions->NewTransformFeedback = st_new_transform_feedback;
 230    functions->DeleteTransformFeedback = st_delete_transform_feedback;
 231    functions->BeginTransformFeedback = st_begin_transform_feedback;
 232    functions->EndTransformFeedback = st_end_transform_feedback;
 233    functions->PauseTransformFeedback = st_pause_transform_feedback;
 234    functions->ResumeTransformFeedback = st_resume_transform_feedback;
 235 }