* Transform feedback functions.
*
* \author Brian Paul
+ * Marek Olšák
*/
-#include "main/imports.h"
+#include "main/bufferobj.h"
#include "main/context.h"
+#include "main/mfeatures.h"
#include "main/transformfeedback.h"
+#include "st_cb_bufferobjects.h"
#include "st_cb_xformfb.h"
+#include "st_context.h"
+#include "pipe/p_context.h"
+#include "util/u_draw.h"
+#include "util/u_inlines.h"
+#include "cso_cache/cso_context.h"
#if FEATURE_EXT_transform_feedback
-#if 0
+struct st_transform_feedback_object {
+ struct gl_transform_feedback_object base;
+
+ unsigned num_targets;
+ struct pipe_stream_output_target *targets[PIPE_MAX_SO_BUFFERS];
+
+ /* This encapsulates the count that can be used as a source for draw_vbo.
+ * It contains a stream output target from the last call of
+ * EndTransformFeedback. */
+ struct pipe_stream_output_target *draw_count;
+};
+
+static INLINE struct st_transform_feedback_object *
+st_transform_feedback_object(struct gl_transform_feedback_object *obj)
+{
+ return (struct st_transform_feedback_object *) obj;
+}
+
static struct gl_transform_feedback_object *
st_new_transform_feedback(struct gl_context *ctx, GLuint name)
{
- struct gl_transform_feedback_object *obj;
- obj = CALLOC_STRUCT(gl_transform_feedback_object);
- if (obj) {
- obj->Name = name;
- obj->RefCount = 1;
- }
- return obj;
+ struct st_transform_feedback_object *obj;
+
+ obj = CALLOC_STRUCT(st_transform_feedback_object);
+ if (!obj)
+ return NULL;
+
+ obj->base.Name = name;
+ obj->base.RefCount = 1;
+ return &obj->base;
}
-#endif
-#if 0
+
static void
st_delete_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
- GLuint i;
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+ unsigned i;
+
+ pipe_so_target_reference(&sobj->draw_count, NULL);
- for (i = 0; i < Elements(obj->Buffers); i++) {
- _mesa_reference_buffer_object(ctx, &obj->Buffers[i], NULL);
+ /* Unreference targets. */
+ for (i = 0; i < sobj->num_targets; i++) {
+ pipe_so_target_reference(&sobj->targets[i], NULL);
+ }
+
+ for (i = 0; i < Elements(sobj->base.Buffers); i++) {
+ _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL);
}
free(obj);
}
-#endif
+/* XXX Do we really need the mode? */
static void
st_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
struct gl_transform_feedback_object *obj)
{
- /* to-do */
-}
-
+ struct st_context *st = st_context(ctx);
+ struct pipe_context *pipe = st->pipe;
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+ unsigned i, max_num_targets;
+
+ max_num_targets = MIN2(Elements(sobj->base.Buffers),
+ Elements(sobj->targets));
+
+ /* Convert the transform feedback state into the gallium representation. */
+ for (i = 0; i < max_num_targets; i++) {
+ struct st_buffer_object *bo = st_buffer_object(sobj->base.Buffers[i]);
+
+ if (bo) {
+ /* Check whether we need to recreate the target. */
+ if (!sobj->targets[i] ||
+ sobj->targets[i] == sobj->draw_count ||
+ sobj->targets[i]->buffer != bo->buffer ||
+ sobj->targets[i]->buffer_offset != sobj->base.Offset[i] ||
+ sobj->targets[i]->buffer_size != sobj->base.Size[i]) {
+ /* Create a new target. */
+ struct pipe_stream_output_target *so_target =
+ pipe->create_stream_output_target(pipe, bo->buffer,
+ sobj->base.Offset[i],
+ sobj->base.Size[i]);
+
+ pipe_so_target_reference(&sobj->targets[i], NULL);
+ sobj->targets[i] = so_target;
+ }
+
+ sobj->num_targets = i+1;
+ } else {
+ pipe_so_target_reference(&sobj->targets[i], NULL);
+ }
+ }
-static void
-st_end_transform_feedback(struct gl_context *ctx,
- struct gl_transform_feedback_object *obj)
-{
- /* to-do */
+ /* Start writing at the beginning of each target. */
+ cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
+ 0);
}
static void
st_pause_transform_feedback(struct gl_context *ctx,
- struct gl_transform_feedback_object *obj)
+ struct gl_transform_feedback_object *obj)
{
- /* to-do */
+ struct st_context *st = st_context(ctx);
+ cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
}
st_resume_transform_feedback(struct gl_context *ctx,
struct gl_transform_feedback_object *obj)
{
- /* to-do */
+ struct st_context *st = st_context(ctx);
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+
+ cso_set_stream_outputs(st->cso_context, sobj->num_targets, sobj->targets,
+ ~0);
+}
+
+
+static struct pipe_stream_output_target *
+st_transform_feedback_get_draw_target(struct gl_transform_feedback_object *obj)
+{
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+ unsigned i;
+
+ for (i = 0; i < Elements(sobj->targets); i++) {
+ if (sobj->targets[i]) {
+ return sobj->targets[i];
+ }
+ }
+
+ assert(0);
+ return NULL;
}
static void
-st_draw_transform_feedback(struct gl_context *ctx, GLenum mode,
- struct gl_transform_feedback_object *obj)
+st_end_transform_feedback(struct gl_context *ctx,
+ struct gl_transform_feedback_object *obj)
{
- /* XXX to do */
- /*
- * Get number of vertices in obj's feedback buffer.
- * Call ctx->Exec.DrawArrays(mode, 0, count);
- */
+ struct st_context *st = st_context(ctx);
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+
+ cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
+
+ pipe_so_target_reference(&sobj->draw_count,
+ st_transform_feedback_get_draw_target(obj));
}
void
-st_init_xformfb_functions(struct dd_function_table *functions)
+st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj,
+ struct pipe_draw_info *out)
{
- /* let core Mesa plug in its functions */
- _mesa_init_transform_feedback_functions(functions);
+ struct st_transform_feedback_object *sobj =
+ st_transform_feedback_object(obj);
+
+ out->count_from_stream_output = sobj->draw_count;
+}
+
- /* then override a few: */
+void
+st_init_xformfb_functions(struct dd_function_table *functions)
+{
+ functions->NewTransformFeedback = st_new_transform_feedback;
+ functions->DeleteTransformFeedback = st_delete_transform_feedback;
functions->BeginTransformFeedback = st_begin_transform_feedback;
functions->EndTransformFeedback = st_end_transform_feedback;
functions->PauseTransformFeedback = st_pause_transform_feedback;
functions->ResumeTransformFeedback = st_resume_transform_feedback;
- functions->DrawTransformFeedback = st_draw_transform_feedback;
}
#endif /* FEATURE_EXT_transform_feedback */
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