src/mesa/state_tracker/st_cb_xformfb.c

   1 /**************************************************************************
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   3  * Copyright 2010 VMware, Inc.
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  16  * of the Software.
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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 a stream output target from the last call of
  58     * EndTransformFeedback. */
  59    struct pipe_stream_output_target *draw_count;
  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, 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    pipe_so_target_reference(&sobj->draw_count, NULL);
  92
  93    /* Unreference targets. */
  94    for (i = 0; i < sobj->num_targets; i++) {
  95       pipe_so_target_reference(&sobj->targets[i], NULL);
  96    }
  97
  98    for (i = 0; i < Elements(sobj->base.Buffers); i++) {
  99       _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL);
 100    }
 101
 102    free(obj);
 103 }
 104
 105
 106 /* XXX Do we really need the mode? */
 107 static void
 108 st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 109                             struct gl_transform_feedback_object *obj)
 110 {
 111    struct st_context *st = st_context(ctx);
 112    struct pipe_context *pipe = st->pipe;
 113    struct st_transform_feedback_object *sobj =
 114          st_transform_feedback_object(obj);
 115    unsigned i, max_num_targets;
 116
 117    max_num_targets = MIN2(Elements(sobj->base.Buffers),
 118                           Elements(sobj->targets));
 119
 120    /* Convert the transform feedback state into the gallium representation. */
 121    for (i = 0; i < max_num_targets; i++) {
 122       struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
 123
 124       if (bo) {
 125          /* Check whether we need to recreate the target. */
 126          if (!sobj->targets[i] ||
 127              sobj->targets[i] == sobj->draw_count ||
 128              sobj->targets[i]->buffer != bo->buffer ||
 129              sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
 130              sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
 131             /* Create a new target. */
 132             struct pipe_stream_output_target *so_target =
 133                   pipe->create_stream_output_target(pipe, bo->buffer,
 134                                                     sobj->base.Offset[i],
 135                                                     sobj->base.Size[i]);
 136
 137             pipe_so_target_reference(&sobj->targets[i], NULL);
 138             sobj->targets[i] = so_target;
 139          }
 140
 141          sobj->num_targets = i+1;
 142       } else {
 143          pipe_so_target_reference(&sobj->targets[i], NULL);
 144       }
 145    }
 146
 147    /* Start writing at the beginning of each target. */
 148    cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
 149                           0);
 150 }
 151
 152
 153 static void
 154 st_pause_transform_feedback(struct gl_context *ctx,
 155                            struct gl_transform_feedback_object *obj)
 156 {
 157    struct st_context *st = st_context(ctx);
 158    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 159 }
 160
 161
 162 static void
 163 st_resume_transform_feedback(struct gl_context *ctx,
 164                              struct gl_transform_feedback_object *obj)
 165 {
 166    struct st_context *st = st_context(ctx);
 167    struct st_transform_feedback_object *sobj =
 168          st_transform_feedback_object(obj);
 169
 170    cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
 171                           ~0);
 172 }
 173
 174
 175 static struct pipe_stream_output_target *
 176 st_transform_feedback_get_draw_target(struct gl_transform_feedback_object *obj)
 177 {
 178    struct st_transform_feedback_object *sobj =
 179          st_transform_feedback_object(obj);
 180    unsigned i;
 181
 182    for (i = 0; i < Elements(sobj->targets); i++) {
 183       if (sobj->targets[i]) {
 184          return sobj->targets[i];
 185       }
 186    }
 187
 188    assert(0);
 189    return NULL;
 190 }
 191
 192
 193 static void
 194 st_end_transform_feedback(struct gl_context *ctx,
 195                           struct gl_transform_feedback_object *obj)
 196 {
 197    struct st_context *st = st_context(ctx);
 198    struct st_transform_feedback_object *sobj =
 199          st_transform_feedback_object(obj);
 200
 201    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 202
 203    pipe_so_target_reference(&sobj->draw_count,
 204                             st_transform_feedback_get_draw_target(obj));
 205 }
 206
 207
 208 void
 209 st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
 210                                 struct pipe_draw_info *out)
 211 {
 212    struct st_transform_feedback_object *sobj =
 213          st_transform_feedback_object(obj);
 214
 215    out->count_from_stream_output = sobj->draw_count;
 216 }
 217
 218
 219 void
 220 st_init_xformfb_functions(struct dd_function_table *functions)
 221 {
 222    functions->NewTransformFeedback = st_new_transform_feedback;
 223    functions->DeleteTransformFeedback = st_delete_transform_feedback;
 224    functions->BeginTransformFeedback = st_begin_transform_feedback;
 225    functions->EndTransformFeedback = st_end_transform_feedback;
 226    functions->PauseTransformFeedback = st_pause_transform_feedback;
 227    functions->ResumeTransformFeedback = st_resume_transform_feedback;
 228 }