1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
// 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 "common.h"
#define MAX_VERTEX_ATTRIBS 16
#define AVG_VERTEX_ATTRIB_NAME_LEN 5
#define VERTEX_ATTRIB_NAMES_BUFFER_LEN ((AVG_VERTEX_ATTRIB_NAME_LEN + 1) * MAX_VERTEX_ATTRIBS)
#define USE_10_10_10 defined(_WIN32)
// (GLEW_VERSION_3_3 || GLEW_ARB_vertex_type_2_10_10_10_rev)
// ^-- this is only guaranteed on Windows right now, will be true on all platforms soon
typedef enum {
COMP_I8 = GL_BYTE,
COMP_U8 = GL_UNSIGNED_BYTE,
COMP_I16 = GL_SHORT,
COMP_U16 = GL_UNSIGNED_SHORT,
COMP_I32 = GL_INT,
COMP_U32 = GL_UNSIGNED_INT,
COMP_F32 = GL_FLOAT, // TODO: drop the GL_ equivalence here, use a private lookup table
#if USE_10_10_10
COMP_I10 = GL_INT_2_10_10_10_REV
#endif
} VertexCompType;
typedef enum {
KEEP_FLOAT,
KEEP_INT,
NORMALIZE_INT_TO_FLOAT, // 127 (ubyte) -> 0.5 (and so on for other int types)
CONVERT_INT_TO_FLOAT // 127 (any int type) -> 127.0
} VertexFetchMode;
typedef struct {
VertexCompType comp_type;
unsigned comp_ct; // 1 to 4
unsigned sz; // size in bytes, 1 to 16
unsigned offset; // from beginning of vertex, in bytes
VertexFetchMode fetch_mode;
const char* name;
} Attrib;
typedef struct {
unsigned attrib_ct; // 0 to 16 (MAX_VERTEX_ATTRIBS)
unsigned stride; // stride in bytes, 1 to 256
bool packed;
Attrib attribs[MAX_VERTEX_ATTRIBS]; // TODO: variable-size attribs array
char names[VERTEX_ATTRIB_NAMES_BUFFER_LEN];
unsigned name_offset;
} VertexFormat;
void VertexFormat_clear(VertexFormat*);
void VertexFormat_copy(VertexFormat* dest, const VertexFormat* src);
unsigned add_attrib(VertexFormat*, const char* name, VertexCompType, unsigned comp_ct, VertexFetchMode);
// format conversion
#if USE_10_10_10
typedef struct {
int x : 10;
int y : 10;
int z : 10;
int w : 2; // 0 by default, can manually set to { -2, -1, 0, 1 }
} PackedNormal;
PackedNormal convert_i10_v3(const float data[3]);
#endif // USE_10_10_10
// for internal use
void VertexFormat_pack(VertexFormat*);
unsigned padding(unsigned offset, unsigned alignment);
unsigned vertex_buffer_size(const VertexFormat*, unsigned vertex_ct);
|
