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/*
* Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
*
* 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, sublicense,
* 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Rob Clark <robclark@freedesktop.org>
*/
/**
* This module converts provides a more convenient front-end to u_indices,
* etc, utils to convert primitive types supported not supported by the
* hardware. It handles binding new index buffer state, and restoring
* previous state after. To use, put something like this at the front of
* drivers pipe->draw_vbo():
*
* // emulate unsupported primitives:
* if (info->mode needs emulating) {
* util_primconvert_save_index_buffer(ctx->primconvert, &ctx->indexbuf);
* util_primconvert_save_rasterizer_state(ctx->primconvert, ctx->rasterizer);
* util_primconvert_draw_vbo(ctx->primconvert, info);
* return;
* }
*
*/
#include "pipe/p_state.h"
#include "util/u_draw.h"
#include "util/u_inlines.h"
#include "util/u_memory.h"
#include "indices/u_indices.h"
#include "indices/u_primconvert.h"
struct primconvert_context
{
struct pipe_context *pipe;
struct pipe_index_buffer saved_ib;
uint32_t primtypes_mask;
unsigned api_pv;
// TODO we could cache/recycle the indexbuf created to translate prims..
};
struct primconvert_context *
util_primconvert_create(struct pipe_context *pipe, uint32_t primtypes_mask)
{
struct primconvert_context *pc = CALLOC_STRUCT(primconvert_context);
if (!pc)
return NULL;
pc->pipe = pipe;
pc->primtypes_mask = primtypes_mask;
return pc;
}
void
util_primconvert_destroy(struct primconvert_context *pc)
{
util_primconvert_save_index_buffer(pc, NULL);
FREE(pc);
}
void
util_primconvert_save_index_buffer(struct primconvert_context *pc,
const struct pipe_index_buffer *ib)
{
if (ib) {
pipe_resource_reference(&pc->saved_ib.buffer, ib->buffer);
pc->saved_ib.index_size = ib->index_size;
pc->saved_ib.offset = ib->offset;
pc->saved_ib.user_buffer = ib->user_buffer;
}
else {
pipe_resource_reference(&pc->saved_ib.buffer, NULL);
}
}
void
util_primconvert_save_rasterizer_state(struct primconvert_context *pc,
const struct pipe_rasterizer_state
*rast)
{
/* if we actually translated the provoking vertex for the buffer,
* we would actually need to save/restore rasterizer state. As
* it is, we just need to make note of the pv.
*/
pc->api_pv = (rast->flatshade
&& !rast->flatshade_first) ? PV_LAST : PV_FIRST;
}
void
util_primconvert_draw_vbo(struct primconvert_context *pc,
const struct pipe_draw_info *info)
{
struct pipe_index_buffer *ib = &pc->saved_ib;
struct pipe_index_buffer new_ib;
struct pipe_draw_info new_info;
struct pipe_transfer *src_transfer = NULL, *dst_transfer = NULL;
u_translate_func trans_func;
u_generate_func gen_func;
const void *src;
void *dst;
memset(&new_ib, 0, sizeof(new_ib));
util_draw_init_info(&new_info);
new_info.indexed = true;
if (info->indexed) {
u_index_translator(pc->primtypes_mask,
info->mode, pc->saved_ib.index_size, info->count,
pc->api_pv, pc->api_pv,
&new_info.mode, &new_ib.index_size, &new_info.count,
&trans_func);
src = ib->user_buffer;
if (!src) {
src = pipe_buffer_map(pc->pipe, ib->buffer,
PIPE_TRANSFER_READ, &src_transfer);
}
}
else {
u_index_generator(pc->primtypes_mask,
info->mode, info->start, info->count,
pc->api_pv, pc->api_pv,
&new_info.mode, &new_ib.index_size, &new_info.count,
&gen_func);
}
new_ib.buffer = pipe_buffer_create(pc->pipe->screen,
PIPE_BIND_INDEX_BUFFER,
PIPE_USAGE_IMMUTABLE,
new_ib.index_size * new_info.count);
dst =
pipe_buffer_map(pc->pipe, new_ib.buffer, PIPE_TRANSFER_WRITE,
&dst_transfer);
if (info->indexed) {
new_info.min_index = 0;
new_info.max_index = ~0;
trans_func(src, info->start, new_info.count, dst);
}
else {
new_info.min_index = info->start;
new_info.max_index = info->start + new_info.count;
gen_func(info->start, new_info.count, dst);
}
if (src_transfer)
pipe_buffer_unmap(pc->pipe, src_transfer);
if (dst_transfer)
pipe_buffer_unmap(pc->pipe, dst_transfer);
/* bind new index buffer: */
pc->pipe->set_index_buffer(pc->pipe, &new_ib);
/* to the translated draw: */
pc->pipe->draw_vbo(pc->pipe, &new_info);
/* and then restore saved ib: */
pc->pipe->set_index_buffer(pc->pipe, ib);
pipe_resource_reference(&new_ib.buffer, NULL);
}
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