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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 TUNGSTEN GRAPHICS 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.
*
**************************************************************************/
/**
* Post-transform vertex buffering. This is an optional part of the
* softpipe rendering pipeline.
* Probably not desired in general, but useful for testing/debuggin.
* Enabled/Disabled with SP_VBUF env var.
*
* Authors
* Brian Paul
*/
#include "sp_context.h"
#include "sp_state.h"
#include "sp_prim_vbuf.h"
#include "pipe/draw/draw_context.h"
#include "pipe/draw/draw_private.h"
#include "pipe/draw/draw_vbuf.h"
#define SP_MAX_VBUF_INDEXES 1024
#define SP_MAX_VBUF_SIZE 4096
/**
* Subclass of vbuf_render.
*/
struct softpipe_vbuf_render
{
struct vbuf_render base;
struct softpipe_context *softpipe;
uint prim;
uint vertex_size;
void *vertex_buffer;
};
/** cast wrapper */
static struct softpipe_vbuf_render *
softpipe_vbuf_render(struct vbuf_render *vbr)
{
return (struct softpipe_vbuf_render *) vbr;
}
static const struct vertex_info *
sp_vbuf_get_vertex_info(struct vbuf_render *vbr)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
return softpipe_get_vbuf_vertex_info(cvbr->softpipe);
}
static void *
sp_vbuf_allocate_vertices(struct vbuf_render *vbr,
ushort vertex_size, ushort nr_vertices)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
assert(!cvbr->vertex_buffer);
cvbr->vertex_buffer = align_malloc(vertex_size * nr_vertices, 16);
cvbr->vertex_size = vertex_size;
return cvbr->vertex_buffer;
}
static void
sp_vbuf_release_vertices(struct vbuf_render *vbr, void *vertices,
unsigned vertex_size, unsigned vertices_used)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
align_free(vertices);
assert(vertices == cvbr->vertex_buffer);
cvbr->vertex_buffer = NULL;
}
static void
sp_vbuf_set_primitive(struct vbuf_render *vbr, unsigned prim)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
cvbr->prim = prim;
}
/**
* Recalculate prim's determinant.
* XXX is this needed?
*/
static void
calc_det(struct prim_header *header)
{
/* Window coords: */
const float *v0 = header->v[0]->data[0];
const float *v1 = header->v[1]->data[0];
const float *v2 = header->v[2]->data[0];
/* edge vectors e = v0 - v2, f = v1 - v2 */
const float ex = v0[0] - v2[0];
const float ey = v0[1] - v2[1];
const float fx = v1[0] - v2[0];
const float fy = v1[1] - v2[1];
/* det = cross(e,f).z */
header->det = ex * fy - ey * fx;
}
static void
sp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr_indices)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
struct softpipe_context *softpipe = cvbr->softpipe;
struct draw_stage *setup = softpipe->setup;
struct prim_header prim;
unsigned vertex_size = softpipe->vertex_info_vbuf.size * sizeof(float);
unsigned i, j;
void *vertex_buffer = cvbr->vertex_buffer;
prim.det = 0;
prim.reset_line_stipple = 0;
prim.edgeflags = 0;
prim.pad = 0;
switch (cvbr->prim) {
case PIPE_PRIM_TRIANGLES:
for (i = 0; i < nr_indices; i += 3) {
for (j = 0; j < 3; j++)
prim.v[j] = (struct vertex_header *)((char *)vertex_buffer +
indices[i+j] * vertex_size);
calc_det(&prim);
setup->tri( setup, &prim );
}
break;
case PIPE_PRIM_LINES:
for (i = 0; i < nr_indices; i += 2) {
for (j = 0; j < 2; j++)
prim.v[j] = (struct vertex_header *)((char *)vertex_buffer +
indices[i+j] * vertex_size);
setup->line( setup, &prim );
}
break;
case PIPE_PRIM_POINTS:
for (i = 0; i < nr_indices; i++) {
prim.v[0] = (struct vertex_header *)((char *)vertex_buffer +
indices[i] * vertex_size);
setup->point( setup, &prim );
}
break;
}
setup->flush( setup, 0 );
}
static void
sp_vbuf_destroy(struct vbuf_render *vbr)
{
struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
cvbr->softpipe->vbuf_render = NULL;
FREE(cvbr);
}
/**
* Initialize the post-transform vertex buffer information for the given
* context.
*/
void
sp_init_vbuf(struct softpipe_context *sp)
{
assert(sp->draw);
sp->vbuf_render = CALLOC_STRUCT(softpipe_vbuf_render);
sp->vbuf_render->base.max_indices = SP_MAX_VBUF_INDEXES;
sp->vbuf_render->base.max_vertex_buffer_bytes = SP_MAX_VBUF_SIZE;
sp->vbuf_render->base.get_vertex_info = sp_vbuf_get_vertex_info;
sp->vbuf_render->base.allocate_vertices = sp_vbuf_allocate_vertices;
sp->vbuf_render->base.set_primitive = sp_vbuf_set_primitive;
sp->vbuf_render->base.draw = sp_vbuf_draw;
sp->vbuf_render->base.release_vertices = sp_vbuf_release_vertices;
sp->vbuf_render->base.destroy = sp_vbuf_destroy;
sp->vbuf_render->softpipe = sp;
sp->vbuf = draw_vbuf_stage(sp->draw, &sp->vbuf_render->base);
draw_set_rasterize_stage(sp->draw, sp->vbuf);
}
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