/**************************************************************************
*
* Copyright 2013 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 VMWARE 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.
*
**************************************************************************/
#include "draw_prim_assembler.h"
#include "draw_fs.h"
#include "draw_gs.h"
#include "util/u_debug.h"
#include "util/u_memory.h"
#include "util/u_prim.h"
#include "pipe/p_defines.h"
struct draw_assembler
{
struct draw_context *draw;
struct draw_prim_info *output_prims;
struct draw_vertex_info *output_verts;
const struct draw_prim_info *input_prims;
const struct draw_vertex_info *input_verts;
boolean needs_primid;
int primid_slot;
unsigned primid;
unsigned num_prims;
};
static boolean
needs_primid(const struct draw_context *draw)
{
const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
const struct draw_geometry_shader *gs = draw->gs.geometry_shader;
if (fs && fs->info.uses_primid) {
return !gs || !gs->info.uses_primid;
}
return FALSE;
}
boolean
draw_prim_assembler_is_required(const struct draw_context *draw,
const struct draw_prim_info *prim_info,
const struct draw_vertex_info *vert_info)
{
switch (prim_info->prim) {
case PIPE_PRIM_LINES_ADJACENCY:
case PIPE_PRIM_LINE_STRIP_ADJACENCY:
case PIPE_PRIM_TRIANGLES_ADJACENCY:
case PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY:
return TRUE;
default:
return needs_primid(draw);
}
}
/*
* Copy the vertex header along with its data from the current
* vertex buffer into a buffer holding vertices arranged
* into decomposed primitives (i.e. buffer without the
* adjacency vertices)
*/
static void
copy_verts(struct draw_assembler *asmblr,
unsigned *indices, unsigned num_indices)
{
unsigned i;
char *output = (char*)asmblr->output_verts->verts;
const char *input = (const char*)asmblr->input_verts->verts;
for (i = 0; i < num_indices; ++i) {
unsigned idx = indices[i];
unsigned output_offset =
asmblr->output_verts->count * asmblr->output_verts->stride;
unsigned input_offset = asmblr->input_verts->stride * idx;
memcpy(output
+ output_offset
, input
+ input_offset
, asmblr->input_verts->vertex_size);
asmblr->output_verts->count += 1;
}
++asmblr->num_prims;
}
static void
inject_primid(struct draw_assembler *asmblr,
unsigned idx,
unsigned primid)
{
int slot = asmblr->primid_slot;
char *input = (char*)asmblr->input_verts->verts;
unsigned input_offset = asmblr->input_verts->stride * idx;
struct vertex_header *v = (struct vertex_header*)(input + input_offset);
/* In case the backend doesn't care about it */
if (slot < 0) {
return;
}
memcpy(&v
->data
[slot
][0], &primid
, sizeof(primid
)); memcpy(&v
->data
[slot
][1], &primid
, sizeof(primid
)); memcpy(&v
->data
[slot
][2], &primid
, sizeof(primid
)); memcpy(&v
->data
[slot
][3], &primid
, sizeof(primid
)); }
static void
prim_point(struct draw_assembler *asmblr,
unsigned idx)
{
unsigned indices[1];
if (asmblr->needs_primid) {
inject_primid(asmblr, idx, asmblr->primid++);
}
indices[0] = idx;
copy_verts(asmblr, indices, 1);
}
static void
prim_line(struct draw_assembler *asmblr,
unsigned i0, unsigned i1)
{
unsigned indices[2];
if (asmblr->needs_primid) {
inject_primid(asmblr, i0, asmblr->primid);
inject_primid(asmblr, i1, asmblr->primid++);
}
indices[0] = i0;
indices[1] = i1;
copy_verts(asmblr, indices, 2);
}
static void
prim_tri(struct draw_assembler *asmblr,
unsigned i0, unsigned i1, unsigned i2)
{
unsigned indices[3];
if (asmblr->needs_primid) {
inject_primid(asmblr, i0, asmblr->primid);
inject_primid(asmblr, i1, asmblr->primid);
inject_primid(asmblr, i2, asmblr->primid++);
}
indices[0] = i0;
indices[1] = i1;
indices[2] = i2;
copy_verts(asmblr, indices, 3);
}
void
draw_prim_assembler_prepare_outputs(struct draw_assembler *ia)
{
struct draw_context *draw = ia->draw;
if (needs_primid(draw)) {
ia->primid_slot = draw_alloc_extra_vertex_attrib(
ia->draw, TGSI_SEMANTIC_PRIMID, 0);
} else {
ia->primid_slot = -1;
}
}
#define FUNC assembler_run_linear
#define GET_ELT(idx) (start + (idx))
#include "draw_prim_assembler_tmp.h"
#define FUNC assembler_run_elts
#define LOCAL_VARS const ushort *elts = input_prims->elts;
#define GET_ELT(idx) (elts[start + (idx)])
#include "draw_prim_assembler_tmp.h"
/*
* Primitive assembler breaks up adjacency primitives and assembles
* the base primitives they represent, e.g. vertices forming
* PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY
* become vertices forming PIPE_PRIM_TRIANGLES
* This is needed because specification says that the adjacency
* primitives are only visible in the geometry shader so we need
* to get rid of them so that the rest of the pipeline can
* process the inputs.
*/
void
draw_prim_assembler_run(struct draw_context *draw,
const struct draw_prim_info *input_prims,
const struct draw_vertex_info *input_verts,
struct draw_prim_info *output_prims,
struct draw_vertex_info *output_verts)
{
struct draw_assembler *asmblr = draw->ia;
unsigned start, i;
unsigned assembled_prim = u_reduced_prim(input_prims->prim);
unsigned max_primitives = u_decomposed_prims_for_vertices(
input_prims->prim, input_prims->count);
unsigned max_verts = u_vertices_per_prim(assembled_prim) * max_primitives;
asmblr->output_prims = output_prims;
asmblr->output_verts = output_verts;
asmblr->input_prims = input_prims;
asmblr->input_verts = input_verts;
asmblr->needs_primid = needs_primid(asmblr->draw);
asmblr->num_prims = 0;
output_prims->linear = TRUE;
output_prims->elts = NULL;
output_prims->start = 0;
output_prims->prim = assembled_prim;
output_prims->flags = 0x0;
output_prims->primitive_lengths = MALLOC(sizeof(unsigned));
output_prims->primitive_lengths[0] = 0;
output_prims->primitive_count = 1;
output_verts->vertex_size = input_verts->vertex_size;
output_verts->stride = input_verts->stride;
output_verts->verts = (struct vertex_header*)MALLOC(
input_verts->vertex_size * max_verts);
output_verts->count = 0;
for (start = i = 0; i < input_prims->primitive_count;
start += input_prims->primitive_lengths[i], i++)
{
unsigned count = input_prims->primitive_lengths[i];
if (input_prims->linear) {
assembler_run_linear(asmblr, input_prims, input_verts,
start, count);
} else {
assembler_run_elts(asmblr, input_prims, input_verts,
start, count);
}
}
output_prims->primitive_lengths[0] = output_verts->count;
output_prims->count = output_verts->count;
}
struct draw_assembler *
draw_prim_assembler_create(struct draw_context *draw)
{
struct draw_assembler *ia = CALLOC_STRUCT( draw_assembler );
ia->draw = draw;
return ia;
}
void
draw_prim_assembler_destroy(struct draw_assembler *ia)
{
FREE(ia);
}
/*
* Called at the very begin of the draw call with a new instance
* Used to reset state that should persist between primitive restart.
*/
void
draw_prim_assembler_new_instance(struct draw_assembler *asmblr)
{
asmblr->primid = 0;
}