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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.
*
**************************************************************************/
/**
* Interface between 'draw' module's output and the llvmpipe rasterizer/setup
* code. When the 'draw' module has finished filling a vertex buffer, the
* draw_arrays() functions below will be called. Loop over the vertices and
* call the point/line/tri setup functions.
*
* Authors
* Brian Paul
*/
#include "lp_context.h"
#include "lp_setup.h"
#include "lp_state.h"
#include "lp_prim_vbuf.h"
#include "draw/draw_context.h"
#include "draw/draw_vbuf.h"
#include "util/u_memory.h"
#include "util/u_prim.h"
#define LP_MAX_VBUF_INDEXES 1024
#define LP_MAX_VBUF_SIZE 4096
typedef const float (*cptrf4)[4];
/**
* Subclass of vbuf_render.
*/
struct llvmpipe_vbuf_render
{
struct vbuf_render base;
struct llvmpipe_context *llvmpipe;
struct setup_context *setup;
uint prim;
uint vertex_size;
uint nr_vertices;
uint vertex_buffer_size;
void *vertex_buffer;
};
/** cast wrapper */
static struct llvmpipe_vbuf_render *
llvmpipe_vbuf_render(struct vbuf_render *vbr)
{
return (struct llvmpipe_vbuf_render *) vbr;
}
static const struct vertex_info *
lp_vbuf_get_vertex_info(struct vbuf_render *vbr)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
return llvmpipe_get_vbuf_vertex_info(cvbr->llvmpipe);
}
static boolean
lp_vbuf_allocate_vertices(struct vbuf_render *vbr,
ushort vertex_size, ushort nr_vertices)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
unsigned size = vertex_size * nr_vertices;
if (cvbr->vertex_buffer_size < size) {
align_free(cvbr->vertex_buffer);
cvbr->vertex_buffer = align_malloc(size, 16);
cvbr->vertex_buffer_size = size;
}
cvbr->vertex_size = vertex_size;
cvbr->nr_vertices = nr_vertices;
return cvbr->vertex_buffer != NULL;
}
static void
lp_vbuf_release_vertices(struct vbuf_render *vbr)
{
/* keep the old allocation for next time */
}
static void *
lp_vbuf_map_vertices(struct vbuf_render *vbr)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
return cvbr->vertex_buffer;
}
static void
lp_vbuf_unmap_vertices(struct vbuf_render *vbr,
ushort min_index,
ushort max_index )
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
assert( cvbr->vertex_buffer_size >= (max_index+1) * cvbr->vertex_size );
/* do nothing */
}
static boolean
lp_vbuf_set_primitive(struct vbuf_render *vbr, unsigned prim)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
struct setup_context *setup_ctx = cvbr->setup;
llvmpipe_setup_prepare( setup_ctx );
cvbr->llvmpipe->reduced_prim = u_reduced_prim(prim);
cvbr->prim = prim;
return TRUE;
}
static INLINE cptrf4 get_vert( const void *vertex_buffer,
int index,
int stride )
{
return (cptrf4)((char *)vertex_buffer + index * stride);
}
/**
* draw elements / indexed primitives
*/
static void
lp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
struct llvmpipe_context *llvmpipe = cvbr->llvmpipe;
const unsigned stride = llvmpipe->vertex_info_vbuf.size * sizeof(float);
const void *vertex_buffer = cvbr->vertex_buffer;
struct setup_context *setup_ctx = cvbr->setup;
unsigned i;
switch (cvbr->prim) {
case PIPE_PRIM_POINTS:
for (i = 0; i < nr; i++) {
llvmpipe_setup_point( setup_ctx,
get_vert(vertex_buffer, indices[i-0], stride) );
}
break;
case PIPE_PRIM_LINES:
for (i = 1; i < nr; i += 2) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
break;
case PIPE_PRIM_LINE_STRIP:
for (i = 1; i < nr; i ++) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
break;
case PIPE_PRIM_LINE_LOOP:
for (i = 1; i < nr; i ++) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
if (nr) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, indices[nr-1], stride),
get_vert(vertex_buffer, indices[0], stride) );
}
break;
case PIPE_PRIM_TRIANGLES:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i += 3) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[i-2], stride) );
}
}
else {
for (i = 2; i < nr; i += 3) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
}
break;
case PIPE_PRIM_TRIANGLE_STRIP:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i+(i&1)-1], stride),
get_vert(vertex_buffer, indices[i-(i&1)], stride),
get_vert(vertex_buffer, indices[i-2], stride) );
}
}
else {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i+(i&1)-2], stride),
get_vert(vertex_buffer, indices[i-(i&1)-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
}
break;
case PIPE_PRIM_TRIANGLE_FAN:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[0], stride),
get_vert(vertex_buffer, indices[i-1], stride) );
}
}
else {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[0], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
}
break;
case PIPE_PRIM_QUADS:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 3; i < nr; i += 4) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-3], stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[i-3], stride) );
}
}
else {
for (i = 3; i < nr; i += 4) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-3], stride),
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
}
break;
case PIPE_PRIM_QUAD_STRIP:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 3; i < nr; i += 2) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-3], stride));
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[i-3], stride) );
}
}
else {
for (i = 3; i < nr; i += 2) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-3], stride),
get_vert(vertex_buffer, indices[i-2], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[i-3], stride),
get_vert(vertex_buffer, indices[i-0], stride) );
}
}
break;
case PIPE_PRIM_POLYGON:
/* Almost same as tri fan but the _first_ vertex specifies the flat
* shading color. Note that the first polygon vertex is passed as
* the last triangle vertex here.
* flatshade_first state makes no difference.
*/
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, indices[i-0], stride),
get_vert(vertex_buffer, indices[i-1], stride),
get_vert(vertex_buffer, indices[0], stride) );
}
break;
default:
assert(0);
}
}
/**
* This function is hit when the draw module is working in pass-through mode.
* It's up to us to convert the vertex array into point/line/tri prims.
*/
static void
lp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
struct llvmpipe_context *llvmpipe = cvbr->llvmpipe;
struct setup_context *setup_ctx = cvbr->setup;
const unsigned stride = llvmpipe->vertex_info_vbuf.size * sizeof(float);
const void *vertex_buffer =
(void *) get_vert(cvbr->vertex_buffer, start, stride);
unsigned i;
switch (cvbr->prim) {
case PIPE_PRIM_POINTS:
for (i = 0; i < nr; i++) {
llvmpipe_setup_point( setup_ctx,
get_vert(vertex_buffer, i-0, stride) );
}
break;
case PIPE_PRIM_LINES:
for (i = 1; i < nr; i += 2) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
break;
case PIPE_PRIM_LINE_STRIP:
for (i = 1; i < nr; i ++) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
break;
case PIPE_PRIM_LINE_LOOP:
for (i = 1; i < nr; i ++) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
if (nr) {
llvmpipe_setup_line( setup_ctx,
get_vert(vertex_buffer, nr-1, stride),
get_vert(vertex_buffer, 0, stride) );
}
break;
case PIPE_PRIM_TRIANGLES:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i += 3) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, i-2, stride) );
}
}
else {
for (i = 2; i < nr; i += 3) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
}
break;
case PIPE_PRIM_TRIANGLE_STRIP:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i++) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i+(i&1)-1, stride),
get_vert(vertex_buffer, i-(i&1), stride),
get_vert(vertex_buffer, i-2, stride) );
}
}
else {
for (i = 2; i < nr; i++) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i+(i&1)-2, stride),
get_vert(vertex_buffer, i-(i&1)-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
}
break;
case PIPE_PRIM_TRIANGLE_FAN:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, 0, stride),
get_vert(vertex_buffer, i-1, stride) );
}
}
else {
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, 0, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
}
break;
case PIPE_PRIM_QUADS:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 3; i < nr; i += 4) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-3, stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, i-3, stride) );
}
}
else {
for (i = 3; i < nr; i += 4) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-3, stride),
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-0, stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride) );
}
}
break;
case PIPE_PRIM_QUAD_STRIP:
if (llvmpipe->rasterizer->flatshade_first) {
for (i = 3; i < nr; i += 2) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-3, stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, i-3, stride) );
}
}
else {
for (i = 3; i < nr; i += 2) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-3, stride),
get_vert(vertex_buffer, i-2, stride),
get_vert(vertex_buffer, i-0, stride) );
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-3, stride),
get_vert(vertex_buffer, i-0, stride) );
}
}
break;
case PIPE_PRIM_POLYGON:
/* Almost same as tri fan but the _first_ vertex specifies the flat
* shading color. Note that the first polygon vertex is passed as
* the last triangle vertex here.
* flatshade_first state makes no difference.
*/
for (i = 2; i < nr; i += 1) {
llvmpipe_setup_tri( setup_ctx,
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, 0, stride) );
}
break;
default:
assert(0);
}
}
static void
lp_vbuf_destroy(struct vbuf_render *vbr)
{
struct llvmpipe_vbuf_render *cvbr = llvmpipe_vbuf_render(vbr);
llvmpipe_setup_destroy_context(cvbr->setup);
FREE(cvbr);
}
/**
* Create the post-transform vertex handler for the given context.
*/
struct vbuf_render *
lp_create_vbuf_backend(struct llvmpipe_context *lp)
{
struct llvmpipe_vbuf_render *cvbr = CALLOC_STRUCT(llvmpipe_vbuf_render);
assert(lp->draw);
cvbr->base.max_indices = LP_MAX_VBUF_INDEXES;
cvbr->base.max_vertex_buffer_bytes = LP_MAX_VBUF_SIZE;
cvbr->base.get_vertex_info = lp_vbuf_get_vertex_info;
cvbr->base.allocate_vertices = lp_vbuf_allocate_vertices;
cvbr->base.map_vertices = lp_vbuf_map_vertices;
cvbr->base.unmap_vertices = lp_vbuf_unmap_vertices;
cvbr->base.set_primitive = lp_vbuf_set_primitive;
cvbr->base.draw = lp_vbuf_draw;
cvbr->base.draw_arrays = lp_vbuf_draw_arrays;
cvbr->base.release_vertices = lp_vbuf_release_vertices;
cvbr->base.destroy = lp_vbuf_destroy;
cvbr->llvmpipe = lp;
cvbr->setup = llvmpipe_setup_create_context(cvbr->llvmpipe);
return &cvbr->base;
}
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