486 lines
13 KiB
C
486 lines
13 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2016 by Mike Erwin.
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* All rights reserved.
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*
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* Contributor(s): Blender Foundation, Clément Foucault
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/gpu/intern/gpu_vertex_format.c
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* \ingroup gpu
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*
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* GPU vertex format
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*/
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#include "GPU_shader_interface.h"
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#include "GPU_vertex_format.h"
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#include "gpu_vertex_format_private.h"
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#include <stddef.h>
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#include <string.h>
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#include "BLI_utildefines.h"
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#define PACK_DEBUG 0
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#if PACK_DEBUG
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# include <stdio.h>
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#endif
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void GPU_vertformat_clear(GPUVertFormat *format)
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{
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#if TRUST_NO_ONE
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memset(format, 0, sizeof(GPUVertFormat));
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#else
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format->attr_len = 0;
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format->packed = false;
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format->name_offset = 0;
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format->name_len = 0;
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for (uint i = 0; i < GPU_VERT_ATTR_MAX_LEN; i++) {
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format->attribs[i].name_len = 0;
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}
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#endif
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}
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void GPU_vertformat_copy(GPUVertFormat *dest, const GPUVertFormat *src)
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{
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/* copy regular struct fields */
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memcpy(dest, src, sizeof(GPUVertFormat));
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for (uint i = 0; i < dest->attr_len; i++) {
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for (uint j = 0; j < dest->attribs[i].name_len; j++) {
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dest->attribs[i].name[j] = (char *)dest + (src->attribs[i].name[j] - ((char *)src));
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}
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}
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}
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static GLenum convert_comp_type_to_gl(GPUVertCompType type)
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{
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static const GLenum table[] = {
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[GPU_COMP_I8] = GL_BYTE,
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[GPU_COMP_U8] = GL_UNSIGNED_BYTE,
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[GPU_COMP_I16] = GL_SHORT,
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[GPU_COMP_U16] = GL_UNSIGNED_SHORT,
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[GPU_COMP_I32] = GL_INT,
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[GPU_COMP_U32] = GL_UNSIGNED_INT,
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[GPU_COMP_F32] = GL_FLOAT,
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[GPU_COMP_I10] = GL_INT_2_10_10_10_REV
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};
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return table[type];
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}
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static uint comp_sz(GPUVertCompType type)
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{
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#if TRUST_NO_ONE
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assert(type <= GPU_COMP_F32); /* other types have irregular sizes (not bytes) */
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#endif
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const GLubyte sizes[] = {1, 1, 2, 2, 4, 4, 4};
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return sizes[type];
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}
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static uint attrib_sz(const GPUVertAttr *a)
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{
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if (a->comp_type == GPU_COMP_I10) {
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return 4; /* always packed as 10_10_10_2 */
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}
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return a->comp_len * comp_sz(a->comp_type);
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}
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static uint attrib_align(const GPUVertAttr *a)
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{
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if (a->comp_type == GPU_COMP_I10) {
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return 4; /* always packed as 10_10_10_2 */
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}
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uint c = comp_sz(a->comp_type);
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if (a->comp_len == 3 && c <= 2) {
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return 4 * c; /* AMD HW can't fetch these well, so pad it out (other vendors too?) */
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}
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else {
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return c; /* most fetches are ok if components are naturally aligned */
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}
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}
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uint vertex_buffer_size(const GPUVertFormat *format, uint vertex_len)
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{
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#if TRUST_NO_ONE
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assert(format->packed && format->stride > 0);
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#endif
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return format->stride * vertex_len;
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}
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static const char *copy_attrib_name(GPUVertFormat *format, const char *name, const char *suffix)
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{
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/* strncpy does 110% of what we need; let's do exactly 100% */
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char *name_copy = format->names + format->name_offset;
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uint available = GPU_VERT_ATTR_NAMES_BUF_LEN - format->name_offset;
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bool terminated = false;
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for (uint i = 0; i < available; ++i) {
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const char c = name[i];
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name_copy[i] = c;
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if (c == '\0') {
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if (suffix) {
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for (uint j = 0; j < available; ++j) {
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const char s = suffix[j];
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name_copy[i + j] = s;
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if (s == '\0') {
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terminated = true;
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format->name_offset += (i + j + 1);
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break;
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}
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}
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}
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else {
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terminated = true;
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format->name_offset += (i + 1);
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}
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break;
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}
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}
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#if TRUST_NO_ONE
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assert(terminated);
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assert(format->name_offset <= GPU_VERT_ATTR_NAMES_BUF_LEN);
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#else
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(void)terminated;
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#endif
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return name_copy;
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}
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uint GPU_vertformat_attr_add(
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GPUVertFormat *format, const char *name,
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GPUVertCompType comp_type, uint comp_len, GPUVertFetchMode fetch_mode)
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{
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#if TRUST_NO_ONE
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assert(format->name_len < GPU_VERT_ATTR_MAX_LEN); /* there's room for more */
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assert(format->attr_len < GPU_VERT_ATTR_MAX_LEN); /* there's room for more */
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assert(!format->packed); /* packed means frozen/locked */
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assert((comp_len >= 1 && comp_len <= 4) || comp_len == 8 || comp_len == 12 || comp_len == 16);
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switch (comp_type) {
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case GPU_COMP_F32:
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/* float type can only kept as float */
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assert(fetch_mode == GPU_FETCH_FLOAT);
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break;
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case GPU_COMP_I10:
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/* 10_10_10 format intended for normals (xyz) or colors (rgb)
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* extra component packed.w can be manually set to { -2, -1, 0, 1 } */
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assert(comp_len == 3 || comp_len == 4);
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assert(fetch_mode == GPU_FETCH_INT_TO_FLOAT_UNIT); /* not strictly required, may relax later */
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break;
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default:
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/* integer types can be kept as int or converted/normalized to float */
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assert(fetch_mode != GPU_FETCH_FLOAT);
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/* only support float matrices (see Batch_update_program_bindings) */
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assert(comp_len != 8 && comp_len != 12 && comp_len != 16);
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}
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#endif
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format->name_len++; /* multiname support */
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const uint attrib_id = format->attr_len++;
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GPUVertAttr *attrib = format->attribs + attrib_id;
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attrib->name[attrib->name_len++] = copy_attrib_name(format, name, NULL);
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attrib->comp_type = comp_type;
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attrib->gl_comp_type = convert_comp_type_to_gl(comp_type);
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attrib->comp_len = (comp_type == GPU_COMP_I10) ? 4 : comp_len; /* system needs 10_10_10_2 to be 4 or BGRA */
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attrib->sz = attrib_sz(attrib);
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attrib->offset = 0; /* offsets & stride are calculated later (during pack) */
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attrib->fetch_mode = fetch_mode;
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return attrib_id;
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}
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void GPU_vertformat_alias_add(GPUVertFormat *format, const char *alias)
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{
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GPUVertAttr *attrib = format->attribs + (format->attr_len - 1);
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#if TRUST_NO_ONE
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assert(format->name_len < GPU_VERT_ATTR_MAX_LEN); /* there's room for more */
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assert(attrib->name_len < GPU_VERT_ATTR_MAX_NAMES);
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#endif
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format->name_len++; /* multiname support */
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attrib->name[attrib->name_len++] = copy_attrib_name(format, alias, NULL);
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}
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int GPU_vertformat_attr_id_get(const GPUVertFormat *format, const char *name)
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{
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for (int i = 0; i < format->attr_len; i++) {
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const GPUVertAttr *attrib = format->attribs + i;
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for (int j = 0; j < attrib->name_len; j++) {
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if (STREQ(name, attrib->name[j])) {
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return i;
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}
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}
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}
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return -1;
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}
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void GPU_vertformat_triple_load(GPUVertFormat *format)
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{
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#if TRUST_NO_ONE
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assert(!format->packed);
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assert(format->attr_len * 3 < GPU_VERT_ATTR_MAX_LEN);
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assert(format->name_len + format->attr_len * 3 < GPU_VERT_ATTR_MAX_LEN);
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#endif
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VertexFormat_pack(format);
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uint old_attr_len = format->attr_len;
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for (uint a_idx = 0; a_idx < old_attr_len; ++a_idx) {
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GPUVertAttr *attrib = format->attribs + a_idx;
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/* Duplicate attrib twice */
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for (int i = 1; i < 3; ++i) {
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GPUVertAttr *dst_attrib = format->attribs + format->attr_len;
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memcpy(dst_attrib, attrib, sizeof(GPUVertAttr));
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/* Increase offset to the next vertex. */
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dst_attrib->offset += format->stride * i;
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/* Only copy first name for now. */
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dst_attrib->name_len = 0;
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dst_attrib->name[dst_attrib->name_len++] = copy_attrib_name(format, attrib->name[0], (i == 1) ? "1" : "2");
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format->attr_len++;
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}
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#if TRUST_NO_ONE
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assert(attrib->name_len < GPU_VERT_ATTR_MAX_NAMES);
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#endif
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/* Add alias to first attrib. */
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format->name_len++;
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attrib->name[attrib->name_len++] = copy_attrib_name(format, attrib->name[0], "0");
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}
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}
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uint padding(uint offset, uint alignment)
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{
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const uint mod = offset % alignment;
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return (mod == 0) ? 0 : (alignment - mod);
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}
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#if PACK_DEBUG
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static void show_pack(uint a_idx, uint sz, uint pad)
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{
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const char c = 'A' + a_idx;
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for (uint i = 0; i < pad; ++i) {
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putchar('-');
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}
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for (uint i = 0; i < sz; ++i) {
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putchar(c);
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}
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}
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#endif
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void VertexFormat_pack(GPUVertFormat *format)
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{
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/* For now, attributes are packed in the order they were added,
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* making sure each attrib is naturally aligned (add padding where necessary)
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* Later we can implement more efficient packing w/ reordering
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* (keep attrib ID order, adjust their offsets to reorder in buffer). */
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/* TODO: realloc just enough to hold the final combo string. And just enough to
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* hold used attribs, not all 16. */
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GPUVertAttr *a0 = format->attribs + 0;
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a0->offset = 0;
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uint offset = a0->sz;
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#if PACK_DEBUG
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show_pack(0, a0->sz, 0);
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#endif
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for (uint a_idx = 1; a_idx < format->attr_len; ++a_idx) {
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GPUVertAttr *a = format->attribs + a_idx;
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uint mid_padding = padding(offset, attrib_align(a));
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offset += mid_padding;
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a->offset = offset;
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offset += a->sz;
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#if PACK_DEBUG
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show_pack(a_idx, a->sz, mid_padding);
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#endif
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}
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uint end_padding = padding(offset, attrib_align(a0));
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#if PACK_DEBUG
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show_pack(0, 0, end_padding);
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putchar('\n');
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#endif
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format->stride = offset + end_padding;
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format->packed = true;
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}
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static uint calc_input_component_size(const GPUShaderInput *input)
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{
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int size = input->size;
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switch (input->gl_type) {
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case GL_FLOAT_VEC2:
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case GL_INT_VEC2:
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case GL_UNSIGNED_INT_VEC2:
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return size * 2;
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case GL_FLOAT_VEC3:
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case GL_INT_VEC3:
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case GL_UNSIGNED_INT_VEC3:
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return size * 3;
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case GL_FLOAT_VEC4:
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case GL_FLOAT_MAT2:
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case GL_INT_VEC4:
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case GL_UNSIGNED_INT_VEC4:
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return size * 4;
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case GL_FLOAT_MAT3:
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return size * 9;
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case GL_FLOAT_MAT4:
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return size * 16;
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case GL_FLOAT_MAT2x3:
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case GL_FLOAT_MAT3x2:
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return size * 6;
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case GL_FLOAT_MAT2x4:
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case GL_FLOAT_MAT4x2:
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return size * 8;
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case GL_FLOAT_MAT3x4:
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case GL_FLOAT_MAT4x3:
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return size * 12;
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default:
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return size;
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}
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}
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static void get_fetch_mode_and_comp_type(
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int gl_type,
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GPUVertCompType *r_comp_type,
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uint *r_gl_comp_type,
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GPUVertFetchMode *r_fetch_mode)
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{
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switch (gl_type) {
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case GL_FLOAT:
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case GL_FLOAT_VEC2:
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case GL_FLOAT_VEC3:
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case GL_FLOAT_VEC4:
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case GL_FLOAT_MAT2:
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case GL_FLOAT_MAT3:
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case GL_FLOAT_MAT4:
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case GL_FLOAT_MAT2x3:
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case GL_FLOAT_MAT2x4:
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case GL_FLOAT_MAT3x2:
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case GL_FLOAT_MAT3x4:
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case GL_FLOAT_MAT4x2:
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case GL_FLOAT_MAT4x3:
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*r_comp_type = GPU_COMP_F32;
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*r_gl_comp_type = GL_FLOAT;
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*r_fetch_mode = GPU_FETCH_FLOAT;
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break;
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case GL_INT:
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case GL_INT_VEC2:
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case GL_INT_VEC3:
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case GL_INT_VEC4:
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*r_comp_type = GPU_COMP_I32;
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*r_gl_comp_type = GL_INT;
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*r_fetch_mode = GPU_FETCH_INT;
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break;
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case GL_UNSIGNED_INT:
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case GL_UNSIGNED_INT_VEC2:
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case GL_UNSIGNED_INT_VEC3:
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case GL_UNSIGNED_INT_VEC4:
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*r_comp_type = GPU_COMP_U32;
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*r_gl_comp_type = GL_UNSIGNED_INT;
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*r_fetch_mode = GPU_FETCH_INT;
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break;
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default:
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BLI_assert(0);
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}
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}
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void GPU_vertformat_from_interface(GPUVertFormat *format, const GPUShaderInterface *shaderface)
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{
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const char *name_buffer = shaderface->name_buffer;
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for (int i = 0; i < GPU_NUM_SHADERINTERFACE_BUCKETS; i++) {
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const GPUShaderInput *input = shaderface->attrib_buckets[i];
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if (input == NULL) {
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continue;
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}
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const GPUShaderInput *next = input;
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while (next != NULL) {
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input = next;
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next = input->next;
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format->name_len++; /* multiname support */
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format->attr_len++;
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GPUVertAttr *attrib = format->attribs + input->location;
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attrib->name[attrib->name_len++] = copy_attrib_name(format, name_buffer + input->name_offset, NULL);
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attrib->offset = 0; /* offsets & stride are calculated later (during pack) */
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attrib->comp_len = calc_input_component_size(input);
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attrib->sz = attrib->comp_len * 4;
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get_fetch_mode_and_comp_type(input->gl_type, &attrib->comp_type, &attrib->gl_comp_type, &attrib->fetch_mode);
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}
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}
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}
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/* OpenGL ES packs in a different order as desktop GL but component conversion is the same.
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* Of the code here, only struct GPUPackedNormal needs to change. */
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#define SIGNED_INT_10_MAX 511
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#define SIGNED_INT_10_MIN -512
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static int clampi(int x, int min_allowed, int max_allowed)
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{
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#if TRUST_NO_ONE
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assert(min_allowed <= max_allowed);
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#endif
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if (x < min_allowed) {
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return min_allowed;
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}
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else if (x > max_allowed) {
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return max_allowed;
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}
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else {
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return x;
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}
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}
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static int quantize(float x)
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{
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int qx = x * 511.0f;
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return clampi(qx, SIGNED_INT_10_MIN, SIGNED_INT_10_MAX);
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}
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static int convert_i16(short x)
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{
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/* 16-bit signed --> 10-bit signed */
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/* TODO: round? */
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return x >> 6;
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}
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GPUPackedNormal GPU_normal_convert_i10_v3(const float data[3])
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{
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GPUPackedNormal n = { .x = quantize(data[0]), .y = quantize(data[1]), .z = quantize(data[2]), };
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return n;
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}
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GPUPackedNormal GPU_normal_convert_i10_s3(const short data[3])
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{
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GPUPackedNormal n = { .x = convert_i16(data[0]), .y = convert_i16(data[1]), .z = convert_i16(data[2]), };
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return n;
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}
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