| /************************************************************************** |
| * |
| * Copyright 2010 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR |
| * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| |
| /** |
| * Transform feedback functions. |
| * |
| * \author Brian Paul |
| * Marek Olšák |
| */ |
| |
| |
| #include "main/bufferobj.h" |
| #include "main/context.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" |
| |
| 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 stream output targets from the last call of |
| * EndTransformFeedback for each stream. */ |
| struct pipe_stream_output_target *draw_count[MAX_VERTEX_STREAMS]; |
| }; |
| |
| 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 st_transform_feedback_object *obj; |
| |
| obj = CALLOC_STRUCT(st_transform_feedback_object); |
| if (!obj) |
| return NULL; |
| |
| _mesa_init_transform_feedback_object(&obj->base, name); |
| |
| return &obj->base; |
| } |
| |
| |
| static void |
| st_delete_transform_feedback(struct gl_context *ctx, |
| struct gl_transform_feedback_object *obj) |
| { |
| struct st_transform_feedback_object *sobj = |
| st_transform_feedback_object(obj); |
| unsigned i; |
| |
| for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++) |
| pipe_so_target_reference(&sobj->draw_count[i], NULL); |
| |
| /* Unreference targets. */ |
| for (i = 0; i < sobj->num_targets; i++) { |
| pipe_so_target_reference(&sobj->targets[i], NULL); |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(sobj->base.Buffers); i++) { |
| _mesa_reference_buffer_object(ctx, &sobj->base.Buffers[i], NULL); |
| } |
| |
| free(obj); |
| } |
| |
| |
| /* 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) |
| { |
| 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; |
| unsigned offsets[PIPE_MAX_SO_BUFFERS] = {0}; |
| |
| max_num_targets = MIN2(ARRAY_SIZE(sobj->base.Buffers), |
| ARRAY_SIZE(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 && bo->buffer) { |
| unsigned stream = obj->program->sh.LinkedTransformFeedback-> |
| Buffers[i].Stream; |
| |
| /* Check whether we need to recreate the target. */ |
| if (!sobj->targets[i] || |
| sobj->targets[i] == sobj->draw_count[stream] || |
| 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); |
| } |
| } |
| |
| /* Start writing at the beginning of each target. */ |
| cso_set_stream_outputs(st->cso_context, sobj->num_targets, |
| sobj->targets, offsets); |
| } |
| |
| |
| static void |
| st_pause_transform_feedback(struct gl_context *ctx, |
| struct gl_transform_feedback_object *obj) |
| { |
| struct st_context *st = st_context(ctx); |
| cso_set_stream_outputs(st->cso_context, 0, NULL, NULL); |
| } |
| |
| |
| static void |
| st_resume_transform_feedback(struct gl_context *ctx, |
| struct gl_transform_feedback_object *obj) |
| { |
| struct st_context *st = st_context(ctx); |
| struct st_transform_feedback_object *sobj = |
| st_transform_feedback_object(obj); |
| unsigned offsets[PIPE_MAX_SO_BUFFERS]; |
| unsigned i; |
| |
| for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++) |
| offsets[i] = (unsigned)-1; |
| |
| cso_set_stream_outputs(st->cso_context, sobj->num_targets, |
| sobj->targets, offsets); |
| } |
| |
| |
| static void |
| st_end_transform_feedback(struct gl_context *ctx, |
| struct gl_transform_feedback_object *obj) |
| { |
| struct st_context *st = st_context(ctx); |
| struct st_transform_feedback_object *sobj = |
| st_transform_feedback_object(obj); |
| unsigned i; |
| |
| cso_set_stream_outputs(st->cso_context, 0, NULL, NULL); |
| |
| /* The next call to glDrawTransformFeedbackStream should use the vertex |
| * count from the last call to glEndTransformFeedback. |
| * Therefore, save the targets for each stream. |
| * |
| * NULL means the vertex counter is 0 (initial state). |
| */ |
| for (i = 0; i < ARRAY_SIZE(sobj->draw_count); i++) |
| pipe_so_target_reference(&sobj->draw_count[i], NULL); |
| |
| for (i = 0; i < ARRAY_SIZE(sobj->targets); i++) { |
| unsigned stream = obj->program->sh.LinkedTransformFeedback-> |
| Buffers[i].Stream; |
| |
| /* Is it not bound or already set for this stream? */ |
| if (!sobj->targets[i] || sobj->draw_count[stream]) |
| continue; |
| |
| pipe_so_target_reference(&sobj->draw_count[stream], sobj->targets[i]); |
| } |
| } |
| |
| |
| bool |
| st_transform_feedback_draw_init(struct gl_transform_feedback_object *obj, |
| unsigned stream, struct pipe_draw_info *out) |
| { |
| struct st_transform_feedback_object *sobj = |
| st_transform_feedback_object(obj); |
| |
| out->count_from_stream_output = sobj->draw_count[stream]; |
| return out->count_from_stream_output != NULL; |
| } |
| |
| |
| 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; |
| } |