-
Notifications
You must be signed in to change notification settings - Fork 0
/
buffer.go
168 lines (146 loc) · 4.13 KB
/
buffer.go
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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
package bgfx
// #include <bgfx/c99/bgfx.h>
import "C"
import (
"errors"
"math"
"reflect"
"unsafe"
)
// VertexLayout bgfx_vertex_layout_t
type VertexLayout struct {
layout C.bgfx_vertex_layout_t
}
// Begin vertex layout
func (v *VertexLayout) Begin() *VertexLayout {
C.bgfx_vertex_layout_begin(&v.layout, C.BGFX_RENDERER_TYPE_NOOP)
return v
}
// Add vertex layout
func (v *VertexLayout) Add(attrib Attrib, num uint8, typ AttribType, normalized bool, asint bool) *VertexLayout {
C.bgfx_vertex_layout_add(
&v.layout,
C.bgfx_attrib_t(attrib),
C.uint8_t(num),
C.bgfx_attrib_type_t(typ),
C._Bool(normalized),
C._Bool(asint),
)
return v
}
// SetOffset of vertex layout
func (v *VertexLayout) SetOffset(attrib Attrib, offset uint) *VertexLayout {
v.layout.offset[attrib] = C.uint16_t(offset)
return v
}
// Skip vertex layout
func (v *VertexLayout) Skip(num uint8) *VertexLayout {
C.bgfx_vertex_layout_skip(&v.layout, C.uint8_t(num))
return v
}
// End vertex layout
func (v *VertexLayout) End() *VertexLayout {
C.bgfx_vertex_layout_end(&v.layout)
return v
}
// Stride of vertex layout
func (v *VertexLayout) Stride() int {
return int(v.layout.stride)
}
// VertexBuffer type
type VertexBuffer struct {
h C.bgfx_vertex_buffer_handle_t
}
// NewVertexBuffer creates vertex buffer
func NewVertexBuffer(slice interface{}, layout VertexLayout) *VertexBuffer {
val := reflect.ValueOf(slice)
if val.Kind() != reflect.Slice {
panic(errors.New("bgfx: expected slice"))
}
size := uintptr(val.Len()) * val.Type().Elem().Size()
return &VertexBuffer{
h: C.bgfx_create_vertex_buffer(
// to keep things simple for now, we'll just copy
C.bgfx_copy(unsafe.Pointer(val.Pointer()), C.uint32_t(size)),
&layout.layout,
C.ushort(BufferNone),
),
}
}
// Destroy vertex buffer
func (vb *VertexBuffer) Destroy() {
C.bgfx_destroy_vertex_buffer(vb.h)
}
// Set vertex buffer
func (vb *VertexBuffer) Set(stream int8) {
C.bgfx_set_vertex_buffer(C.uchar(stream), vb.h, 0, C.UINT32_MAX)
}
// DynamicVertexBuffer type
type DynamicVertexBuffer struct {
h C.bgfx_dynamic_vertex_buffer_handle_t
}
// NewDynamicVertexBuffer creates emmpty dynamic vertex buffer
func NewDynamicVertexBuffer(num int, layout VertexLayout) *DynamicVertexBuffer {
return &DynamicVertexBuffer{
h: C.bgfx_create_dynamic_vertex_buffer(
C.uint32_t(num),
&layout.layout,
C.ushort(BufferNone),
),
}
}
// NewDynamicVertexBufferMem creates dynamic vertex buffer and initialize it.
func NewDynamicVertexBufferMem(mem interface{}, layout VertexLayout) *DynamicVertexBuffer {
val := reflect.ValueOf(mem)
if val.Kind() != reflect.Slice {
panic(errors.New("bgfx: expected slice"))
}
size := uintptr(val.Len()) * val.Type().Elem().Size()
return &DynamicVertexBuffer{
h: C.bgfx_create_dynamic_vertex_buffer_mem(
// to keep things simple for now, we'll just copy
C.bgfx_copy(unsafe.Pointer(val.Pointer()), C.uint32_t(size)),
&layout.layout,
C.ushort(BufferNone),
),
}
}
// Update dynamic vertex buffer.
func (b *DynamicVertexBuffer) Update(mem interface{}) {
val := reflect.ValueOf(mem)
if val.Kind() != reflect.Slice {
panic(errors.New("bgfx: expected slice"))
}
size := uintptr(val.Len()) * val.Type().Elem().Size()
C.bgfx_update_dynamic_vertex_buffer(b.h, 0, C.bgfx_copy(unsafe.Pointer(val.Pointer()), C.uint32_t(size)))
}
// Set vertex buffer for draw primitive
func (b *DynamicVertexBuffer) Set(stream int8) {
C.bgfx_set_dynamic_vertex_buffer(C.uint8_t(stream), b.h, 0, C.uint32_t(math.MaxUint32))
}
// Destroy buffer
func (b *DynamicVertexBuffer) Destroy() {
C.bgfx_destroy_dynamic_vertex_buffer(b.h)
}
// IndexBuffer type
type IndexBuffer struct {
h C.bgfx_index_buffer_handle_t
}
// NewIndexBuffer creates index buffer
func NewIndexBuffer(data []uint16) *IndexBuffer {
return &IndexBuffer{
h: C.bgfx_create_index_buffer(
// to keep things simple for now, we'll just copy
C.bgfx_copy(unsafe.Pointer(&data[0]), C.uint32_t(len(data)*2)),
C.ushort(BufferNone),
),
}
}
// Destroy destroys index buffer
func (ib *IndexBuffer) Destroy() {
C.bgfx_destroy_index_buffer(ib.h)
}
// Set index buffer
func (ib *IndexBuffer) Set() {
C.bgfx_set_index_buffer(ib.h, 0, C.UINT32_MAX)
}