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// Gawain vertex format
//
// This code is part of the Gawain library, with modifications
// specific to integration with Blender.
//
// Copyright 2016 Mike Erwin
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
#pragma once
#include "gwn_common.h"
#define GWN_VERT_ATTR_MAX_LEN 16
#define GWN_VERT_ATTR_MAX_NAMES 3
#define GWN_VERT_ATTR_NAME_AVERAGE_LEN 11
#define GWN_VERT_ATTR_NAMES_BUF_LEN ((GWN_VERT_ATTR_NAME_AVERAGE_LEN + 1) * GWN_VERT_ATTR_MAX_LEN)
typedef enum {
GWN_COMP_I8,
GWN_COMP_U8,
GWN_COMP_I16,
GWN_COMP_U16,
GWN_COMP_I32,
GWN_COMP_U32,
GWN_COMP_F32,
GWN_COMP_I10
} Gwn_VertCompType;
typedef enum {
GWN_FETCH_FLOAT,
GWN_FETCH_INT,
GWN_FETCH_INT_TO_FLOAT_UNIT, // 127 (ubyte) -> 0.5 (and so on for other int types)
GWN_FETCH_INT_TO_FLOAT // 127 (any int type) -> 127.0
} Gwn_VertFetchMode;
typedef struct Gwn_VertAttr {
Gwn_VertFetchMode fetch_mode;
Gwn_VertCompType comp_type;
unsigned gl_comp_type;
unsigned comp_ct; // 1 to 4 or 8 or 12 or 16
unsigned sz; // size in bytes, 1 to 64
unsigned offset; // from beginning of vertex, in bytes
unsigned name_ct; // up to GWN_VERT_ATTR_MAX_NAMES
const char* name[GWN_VERT_ATTR_MAX_NAMES];
} Gwn_VertAttr;
typedef struct Gwn_VertFormat {
unsigned attrib_ct; // 0 to 16 (GWN_VERT_ATTR_MAX_LEN)
unsigned name_ct; // total count of active vertex attrib
unsigned stride; // stride in bytes, 1 to 256
unsigned name_offset;
bool packed;
char names[GWN_VERT_ATTR_NAMES_BUF_LEN];
Gwn_VertAttr attribs[GWN_VERT_ATTR_MAX_LEN]; // TODO: variable-size attribs array
} Gwn_VertFormat;
void GWN_vertformat_clear(Gwn_VertFormat*);
void GWN_vertformat_copy(Gwn_VertFormat* dest, const Gwn_VertFormat* src);
unsigned GWN_vertformat_attr_add(Gwn_VertFormat*, const char* name, Gwn_VertCompType, unsigned comp_ct, Gwn_VertFetchMode);
void GWN_vertformat_alias_add(Gwn_VertFormat*, const char* alias);
// format conversion
typedef struct Gwn_PackedNormal {
int x : 10;
int y : 10;
int z : 10;
int w : 2; // 0 by default, can manually set to { -2, -1, 0, 1 }
} Gwn_PackedNormal;
Gwn_PackedNormal GWN_normal_convert_i10_v3(const float data[3]);
Gwn_PackedNormal GWN_normal_convert_i10_s3(const short data[3]);
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