src/mesa/state_tracker/st_cb_xformfb.c

   1 /**************************************************************************
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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/mfeatures.h"
  40 #include "main/transformfeedback.h"
  41
  42 #include "st_cb_bufferobjects.h"
  43 #include "st_cb_xformfb.h"
  44 #include "st_context.h"
  45
  46 #include "pipe/p_context.h"
  47 #include "util/u_draw.h"
  48 #include "util/u_inlines.h"
  49 #include "cso_cache/cso_context.h"
  50
  51 struct st_transform_feedback_object {
  52    struct gl_transform_feedback_object base;
  53
  54    unsigned num_targets;
  55    struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
  56
  57    /* This encapsulates the count that can be used as a source for draw_vbo.
  58     * It contains a stream output target from the last call of
  59     * EndTransformFeedback. */
  60    struct pipe_stream_output_target *draw_count;
  61 };
  62
  63 static INLINE struct st_transform_feedback_object *
  64 st_transform_feedback_object(struct gl_transform_feedback_object *obj)
  65 {
  66    return (struct st_transform_feedback_object *) obj;
  67 }
  68
  69 static struct gl_transform_feedback_object *
  70 st_new_transform_feedback(struct gl_context *ctx, GLuint name)
  71 {
  72    struct st_transform_feedback_object *obj;
  73
  74    obj = CALLOC_STRUCT(st_transform_feedback_object);
  75    if (!obj)
  76       return NULL;
  77
  78    obj->base.Name = name;
  79    obj->base.RefCount = 1;
  80    return &obj->base;
  81 }
  82
  83
  84 static void
  85 st_delete_transform_feedback(struct gl_context *ctx,
  86                              struct gl_transform_feedback_object *obj)
  87 {
  88    struct st_transform_feedback_object *sobj =
  89          st_transform_feedback_object(obj);
  90    unsigned i;
  91
  92    pipe_so_target_reference(&sobj->draw_count, 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    for (i = 0; i < Elements(sobj->base.Buffers); i++) {
 100       _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL);
 101    }
 102
 103    free(obj);
 104 }
 105
 106
 107 /* XXX Do we really need the mode? */
 108 static void
 109 st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 110                             struct gl_transform_feedback_object *obj)
 111 {
 112    struct st_context *st = st_context(ctx);
 113    struct pipe_context *pipe = st->pipe;
 114    struct st_transform_feedback_object *sobj =
 115          st_transform_feedback_object(obj);
 116    unsigned i, max_num_targets;
 117
 118    max_num_targets = MIN2(Elements(sobj->base.Buffers),
 119                           Elements(sobj->targets));
 120
 121    /* Convert the transform feedback state into the gallium representation. */
 122    for (i = 0; i < max_num_targets; i++) {
 123       struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
 124
 125       if (bo) {
 126          /* Check whether we need to recreate the target. */
 127          if (!sobj->targets[i] ||
 128              sobj->targets[i] == sobj->draw_count ||
 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, sobj->targets,
 150                           0);
 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, 0);
 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
 171    cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
 172                           ~0);
 173 }
 174
 175
 176 static struct pipe_stream_output_target *
 177 st_transform_feedback_get_draw_target(struct gl_transform_feedback_object *obj)
 178 {
 179    struct st_transform_feedback_object *sobj =
 180          st_transform_feedback_object(obj);
 181    unsigned i;
 182
 183    for (i = 0; i < Elements(sobj->targets); i++) {
 184       if (sobj->targets[i]) {
 185          return sobj->targets[i];
 186       }
 187    }
 188
 189    assert(0);
 190    return NULL;
 191 }
 192
 193
 194 static void
 195 st_end_transform_feedback(struct gl_context *ctx,
 196                           struct gl_transform_feedback_object *obj)
 197 {
 198    struct st_context *st = st_context(ctx);
 199    struct st_transform_feedback_object *sobj =
 200          st_transform_feedback_object(obj);
 201
 202    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 203
 204    pipe_so_target_reference(&sobj->draw_count,
 205                             st_transform_feedback_get_draw_target(obj));
 206 }
 207
 208
 209 void
 210 st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
 211                                 struct pipe_draw_info *out)
 212 {
 213    struct st_transform_feedback_object *sobj =
 214          st_transform_feedback_object(obj);
 215
 216    out->count_from_stream_output = sobj->draw_count;
 217 }
 218
 219
 220 void
 221 st_init_xformfb_functions(struct dd_function_table *functions)
 222 {
 223    functions->NewTransformFeedback = st_new_transform_feedback;
 224    functions->DeleteTransformFeedback = st_delete_transform_feedback;
 225    functions->BeginTransformFeedback = st_begin_transform_feedback;
 226    functions->EndTransformFeedback = st_end_transform_feedback;
 227    functions->PauseTransformFeedback = st_pause_transform_feedback;
 228    functions->ResumeTransformFeedback = st_resume_transform_feedback;
 229 }