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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// Gawain vertex buffer
//
// 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_vertex_format.h"
#define VRAM_USAGE 1
// How to create a Gwn_VertBuf:
// 1) verts = GWN_vertbuf_create() or GWN_vertbuf_init(verts)
// 2) GWN_vertformat_attr_add(verts->format, ...)
// 3) GWN_vertbuf_data_alloc(verts, vertex_ct) <-- finalizes/packs vertex format
// 4) GWN_vertbuf_attr_fill(verts, pos, application_pos_buffer)
// Is Gwn_VertBuf always used as part of a Gwn_Batch?
typedef enum {
// can be extended to support more types
GWN_USAGE_STREAM,
GWN_USAGE_STATIC, // do not keep data in memory
GWN_USAGE_DYNAMIC
} Gwn_UsageType;
typedef struct Gwn_VertBuf {
Gwn_VertFormat format;
unsigned vertex_ct; // number of verts we want to draw
unsigned vertex_alloc; // number of verts data
bool dirty;
uchar* data; // NULL indicates data in VRAM (unmapped)
uint32_t vbo_id; // 0 indicates not yet allocated
Gwn_UsageType usage; // usage hint for GL optimisation
} Gwn_VertBuf;
Gwn_VertBuf* GWN_vertbuf_create(Gwn_UsageType);
Gwn_VertBuf* GWN_vertbuf_create_with_format_ex(const Gwn_VertFormat*, Gwn_UsageType);
#define GWN_vertbuf_create_with_format(format) \
GWN_vertbuf_create_with_format_ex(format, GWN_USAGE_STATIC)
void GWN_vertbuf_discard(Gwn_VertBuf*);
void GWN_vertbuf_init(Gwn_VertBuf*, Gwn_UsageType);
void GWN_vertbuf_init_with_format_ex(Gwn_VertBuf*, const Gwn_VertFormat*, Gwn_UsageType);
#define GWN_vertbuf_init_with_format(verts, format) \
GWN_vertbuf_init_with_format_ex(verts, format, GWN_USAGE_STATIC)
unsigned GWN_vertbuf_size_get(const Gwn_VertBuf*);
void GWN_vertbuf_data_alloc(Gwn_VertBuf*, unsigned v_ct);
void GWN_vertbuf_data_resize(Gwn_VertBuf*, unsigned v_ct);
void GWN_vertbuf_vertex_count_set(Gwn_VertBuf*, unsigned v_ct);
// The most important set_attrib variant is the untyped one. Get it right first.
// It takes a void* so the app developer is responsible for matching their app data types
// to the vertex attribute's type and component count. They're in control of both, so this
// should not be a problem.
void GWN_vertbuf_attr_set(Gwn_VertBuf*, unsigned a_idx, unsigned v_idx, const void* data);
void GWN_vertbuf_attr_fill(Gwn_VertBuf*, unsigned a_idx, const void* data); // tightly packed, non interleaved input data
void GWN_vertbuf_attr_fill_stride(Gwn_VertBuf*, unsigned a_idx, unsigned stride, const void* data);
// For low level access only
typedef struct Gwn_VertBufRaw {
unsigned size;
unsigned stride;
uchar* data;
uchar* data_init;
#if TRUST_NO_ONE
// Only for overflow check
uchar* _data_end;
#endif
} Gwn_VertBufRaw;
GWN_INLINE void *GWN_vertbuf_raw_step(Gwn_VertBufRaw *a)
{
uchar* data = a->data;
a->data += a->stride;
#if TRUST_NO_ONE
assert(data < a->_data_end);
#endif
return (void *)data;
}
GWN_INLINE unsigned GWN_vertbuf_raw_used(Gwn_VertBufRaw *a)
{
return ((a->data - a->data_init) / a->stride);
}
void GWN_vertbuf_attr_get_raw_data(Gwn_VertBuf*, unsigned a_idx, Gwn_VertBufRaw *access);
// TODO: decide whether to keep the functions below
// doesn't immediate mode satisfy these needs?
// void setAttrib1f(unsigned a_idx, unsigned v_idx, float x);
// void setAttrib2f(unsigned a_idx, unsigned v_idx, float x, float y);
// void setAttrib3f(unsigned a_idx, unsigned v_idx, float x, float y, float z);
// void setAttrib4f(unsigned a_idx, unsigned v_idx, float x, float y, float z, float w);
//
// void setAttrib3ub(unsigned a_idx, unsigned v_idx, unsigned char r, unsigned char g, unsigned char b);
// void setAttrib4ub(unsigned a_idx, unsigned v_idx, unsigned char r, unsigned char g, unsigned char b, unsigned char a);
void GWN_vertbuf_use(Gwn_VertBuf*);
// Metrics
unsigned GWN_vertbuf_get_memory_usage(void);
// Macros
#define GWN_VERTBUF_DISCARD_SAFE(verts) do { \
if (verts != NULL) { \
GWN_vertbuf_discard(verts); \
verts = NULL; \
} \
} while (0)
|
