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/**************************************************************************
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* Copyright 2023 Red Hat.
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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**************************************************************************/
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* Mesh primitive assembler
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* This takes vertex and per-primitive data, and assembles a linear set
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* of draw compatible vertices.
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#include "draw_mesh_prim.h"
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#include "draw/draw_context.h"
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#include "draw/draw_private.h"
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#include "util/u_debug.h"
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#include "util/u_memory.h"
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#include "util/u_prim.h"
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#include "pipe/p_defines.h"
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struct draw_context *draw;
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struct draw_prim_info *output_prims;
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struct draw_vertex_info *output_verts;
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const struct draw_prim_info *input_prims;
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const struct draw_vertex_info *input_verts;
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uint32_t num_per_prim;
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uint32_t added_prim_size;
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add_prim(struct draw_mesh_prim *asmblr, unsigned length)
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struct draw_prim_info *output_prims = asmblr->output_prims;
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output_prims->primitive_lengths = realloc(output_prims->primitive_lengths, sizeof(unsigned) * (output_prims->primitive_count + 1));
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output_prims->primitive_lengths[output_prims->primitive_count] = length;
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output_prims->primitive_count++;
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* Copy the vertex header along with its data from the current
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* vertex buffer into a buffer holding vertices arranged
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* into decomposed primitives (i.e. buffer without the
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copy_verts(struct draw_mesh_prim *asmblr,
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unsigned *indices, unsigned num_indices)
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char *output = (char*)asmblr->output_verts->verts;
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const char *input = (const char*)asmblr->input_verts->verts;
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for (unsigned i = 0; i < num_indices; ++i) {
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unsigned idx = indices[i];
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unsigned output_offset =
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asmblr->output_verts->count * asmblr->output_verts->stride;
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unsigned input_offset = asmblr->input_verts->stride * idx;
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memcpy(output + output_offset, input + input_offset,
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asmblr->input_verts->vertex_size);
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memcpy(output + output_offset + asmblr->input_verts->vertex_size,
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asmblr->per_prim + (asmblr->num_prims * asmblr->added_prim_size * 8),
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asmblr->added_prim_size);
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asmblr->output_verts->count += 1;
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cull_prim(struct draw_mesh_prim *asmblr)
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if (asmblr->cull_prim_idx == -1)
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const uint32_t *cull_prim_ptr = (uint32_t *)(asmblr->per_prim + (asmblr->num_prims * asmblr->added_prim_size * 8));
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cull_prim_ptr += (asmblr->cull_prim_idx * 4);
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return (*cull_prim_ptr) ? true : false;
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prim_point(struct draw_mesh_prim *asmblr,
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if (cull_prim(asmblr)) {
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copy_verts(asmblr, indices, 1);
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prim_line(struct draw_mesh_prim *asmblr,
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unsigned i0, unsigned i1)
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if (cull_prim(asmblr)) {
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copy_verts(asmblr, indices, 2);
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prim_tri(struct draw_mesh_prim *asmblr,
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unsigned i0, unsigned i1, unsigned i2)
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if (cull_prim(asmblr)) {
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copy_verts(asmblr, indices, 3);
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#define FUNC assembler_run_linear
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#define GET_ELT(idx) (start + (idx))
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#include "draw_mesh_prim_tmp.h"
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#define FUNC assembler_run_elts
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#define LOCAL_VARS const uint16_t *elts = input_prims->elts;
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#define GET_ELT(idx) (elts[start + (idx)])
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#include "draw_mesh_prim_tmp.h"
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draw_mesh_prim_run(struct draw_context *draw,
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unsigned num_per_prim_inputs,
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void *per_prim_inputs,
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const struct draw_prim_info *input_prims,
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const struct draw_vertex_info *input_verts,
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struct draw_prim_info *output_prims,
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struct draw_vertex_info *output_verts)
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struct draw_mesh_prim asmblr_mesh;
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struct draw_mesh_prim *asmblr = &asmblr_mesh;
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unsigned max_primitives = input_prims->primitive_count;
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unsigned max_verts = u_vertices_per_prim(input_prims->prim) * max_primitives;
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asmblr->output_prims = output_prims;
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asmblr->output_verts = output_verts;
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asmblr->input_prims = input_prims;
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asmblr->input_verts = input_verts;
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asmblr->num_prims = 0;
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asmblr->num_per_prim = num_per_prim_inputs;
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asmblr->per_prim = per_prim_inputs;
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asmblr->cull_prim_idx = cull_prim_idx;
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output_prims->linear = true;
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output_prims->elts = NULL;
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output_prims->start = 0;
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output_prims->prim = input_prims->prim;
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output_prims->flags = 0x0;
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output_prims->primitive_lengths = MALLOC(sizeof(unsigned));
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output_prims->primitive_lengths[0] = 0;
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output_prims->primitive_count = 0;
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asmblr->added_prim_size = asmblr->num_per_prim * (4 * sizeof(float));
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output_verts->vertex_size = input_verts->vertex_size + asmblr->added_prim_size;
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output_verts->stride = output_verts->vertex_size;
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output_verts->verts = (struct vertex_header*)MALLOC(
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output_verts->vertex_size * max_verts);
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output_verts->count = 0;
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for (start = i = 0; i < input_prims->primitive_count;
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start += input_prims->primitive_lengths[i], i++) {
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unsigned count = input_prims->primitive_lengths[i];
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if (input_prims->linear) {
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assembler_run_linear(asmblr, input_prims, input_verts,
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assembler_run_elts(asmblr, input_prims, input_verts,
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output_prims->count = output_verts->count;