reactos/dll/opengl/mesa/src/mesa/state_tracker/st_cb_xformfb.c

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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/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 #if FEATURE_EXT_transform_feedback
  52
  53 struct st_transform_feedback_object {
  54    struct gl_transform_feedback_object base;
  55
  56    unsigned num_targets;
  57    struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
  58
  59    /* This encapsulates the count that can be used as a source for draw_vbo.
  60     * It contains a stream output target from the last call of
  61     * EndTransformFeedback. */
  62    struct pipe_stream_output_target *draw_count;
  63 };
  64
  65 static INLINE struct st_transform_feedback_object *
  66 st_transform_feedback_object(struct gl_transform_feedback_object *obj)
  67 {
  68    return (struct st_transform_feedback_object *) obj;
  69 }
  70
  71 static struct gl_transform_feedback_object *
  72 st_new_transform_feedback(struct gl_context *ctx, GLuint name)
  73 {
  74    struct st_transform_feedback_object *obj;
  75
  76    obj = CALLOC_STRUCT(st_transform_feedback_object);
  77    if (!obj)
  78       return NULL;
  79
  80    obj->base.Name = name;
  81    obj->base.RefCount = 1;
  82    return &obj->base;
  83 }
  84
  85
  86 static void
  87 st_delete_transform_feedback(struct gl_context *ctx,
  88                              struct gl_transform_feedback_object *obj)
  89 {
  90    struct st_transform_feedback_object *sobj =
  91          st_transform_feedback_object(obj);
  92    unsigned i;
  93
  94    pipe_so_target_reference(&sobj->draw_count, NULL);
  95
  96    /* Unreference targets. */
  97    for (i = 0; i < sobj->num_targets; i++) {
  98       pipe_so_target_reference(&sobj->targets[i], NULL);
  99    }
 100
 101    for (i = 0; i < Elements(sobj->base.Buffers); i++) {
 102       _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL);
 103    }
 104
 105    free(obj);
 106 }
 107
 108
 109 /* XXX Do we really need the mode? */
 110 static void
 111 st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 112                             struct gl_transform_feedback_object *obj)
 113 {
 114    struct st_context *st = st_context(ctx);
 115    struct pipe_context *pipe = st->pipe;
 116    struct st_transform_feedback_object *sobj =
 117          st_transform_feedback_object(obj);
 118    unsigned i, max_num_targets;
 119
 120    max_num_targets = MIN2(Elements(sobj->base.Buffers),
 121                           Elements(sobj->targets));
 122
 123    /* Convert the transform feedback state into the gallium representation. */
 124    for (i = 0; i < max_num_targets; i++) {
 125       struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
 126
 127       if (bo) {
 128          /* Check whether we need to recreate the target. */
 129          if (!sobj->targets[i] ||
 130              sobj->targets[i] == sobj->draw_count ||
 131              sobj->targets[i]->buffer != bo->buffer ||
 132              sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
 133              sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
 134             /* Create a new target. */
 135             struct pipe_stream_output_target *so_target =
 136                   pipe->create_stream_output_target(pipe, bo->buffer,
 137                                                     sobj->base.Offset[i],
 138                                                     sobj->base.Size[i]);
 139
 140             pipe_so_target_reference(&sobj->targets[i], NULL);
 141             sobj->targets[i] = so_target;
 142          }
 143
 144          sobj->num_targets = i+1;
 145       } else {
 146          pipe_so_target_reference(&sobj->targets[i], NULL);
 147       }
 148    }
 149
 150    /* Start writing at the beginning of each target. */
 151    cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
 152                           0);
 153 }
 154
 155
 156 static void
 157 st_pause_transform_feedback(struct gl_context *ctx,
 158                            struct gl_transform_feedback_object *obj)
 159 {
 160    struct st_context *st = st_context(ctx);
 161    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 162 }
 163
 164
 165 static void
 166 st_resume_transform_feedback(struct gl_context *ctx,
 167                              struct gl_transform_feedback_object *obj)
 168 {
 169    struct st_context *st = st_context(ctx);
 170    struct st_transform_feedback_object *sobj =
 171          st_transform_feedback_object(obj);
 172
 173    cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
 174                           ~0);
 175 }
 176
 177
 178 static struct pipe_stream_output_target *
 179 st_transform_feedback_get_draw_target(struct gl_transform_feedback_object *obj)
 180 {
 181    struct st_transform_feedback_object *sobj =
 182          st_transform_feedback_object(obj);
 183    unsigned i;
 184
 185    for (i = 0; i < Elements(sobj->targets); i++) {
 186       if (sobj->targets[i]) {
 187          return sobj->targets[i];
 188       }
 189    }
 190
 191    assert(0);
 192    return NULL;
 193 }
 194
 195
 196 static void
 197 st_end_transform_feedback(struct gl_context *ctx,
 198                           struct gl_transform_feedback_object *obj)
 199 {
 200    struct st_context *st = st_context(ctx);
 201    struct st_transform_feedback_object *sobj =
 202          st_transform_feedback_object(obj);
 203
 204    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 205
 206    pipe_so_target_reference(&sobj->draw_count,
 207                             st_transform_feedback_get_draw_target(obj));
 208 }
 209
 210
 211 void
 212 st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
 213                                 struct pipe_draw_info *out)
 214 {
 215    struct st_transform_feedback_object *sobj =
 216          st_transform_feedback_object(obj);
 217
 218    out->count_from_stream_output = sobj->draw_count;
 219 }
 220
 221
 222 void
 223 st_init_xformfb_functions(struct dd_function_table *functions)
 224 {
 225    functions->NewTransformFeedback = st_new_transform_feedback;
 226    functions->DeleteTransformFeedback = st_delete_transform_feedback;
 227    functions->BeginTransformFeedback = st_begin_transform_feedback;
 228    functions->EndTransformFeedback = st_end_transform_feedback;
 229    functions->PauseTransformFeedback = st_pause_transform_feedback;
 230    functions->ResumeTransformFeedback = st_resume_transform_feedback;
 231 }
 232
 233 #endif /* FEATURE_EXT_transform_feedback */