/
win_texture.go
executable file
·201 lines (148 loc) · 5.37 KB
/
win_texture.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
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
Copyright 2023 Milan Suk
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this db except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"bytes"
"image"
"image/draw"
"os"
"github.com/go-gl/gl/v2.1/gl"
)
type WinTexture struct {
id uint32
size OsV2
}
func InitWinTextureSize(size OsV2) (*WinTexture, error) {
var tex WinTexture
gl.GenTextures(1, &tex.id)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex.id)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
tex.size = size
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.SRGB_ALPHA, int32(tex.size.X), int32(tex.size.Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
return &tex, nil
}
func InitWinTextureFromImageRGBA(rgba *image.RGBA) (*WinTexture, error) {
var tex WinTexture
gl.GenTextures(1, &tex.id)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex.id)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
tex.size = OsV2{rgba.Rect.Size().X, rgba.Rect.Size().Y}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, int32(tex.size.X), int32(tex.size.Y), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(rgba.Pix))
//gl.GenerateMipmap(texture.id)
gl.BindTexture(gl.TEXTURE_2D, 0) //UnBind
return &tex, nil
}
func InitWinTextureFromImageAlpha(alpha *image.Alpha) (*WinTexture, error) {
var tex WinTexture
gl.GenTextures(1, &tex.id)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex.id)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
tex.size = OsV2{alpha.Rect.Size().X, alpha.Rect.Size().Y}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, int32(tex.size.X), int32(tex.size.Y), 0, gl.ALPHA, gl.UNSIGNED_BYTE, gl.Ptr(alpha.Pix))
gl.BindTexture(gl.TEXTURE_2D, 0) //UnBind
return &tex, nil
}
func InitWinTextureFromImage(img image.Image) (*WinTexture, error) {
rgba := image.NewRGBA(img.Bounds())
draw.Draw(rgba, rgba.Bounds(), img, image.Pt(0, 0), draw.Src)
return InitWinTextureFromImageRGBA(rgba)
}
func InitWinTextureFromBlob(blob []byte) (*WinTexture, image.Image, error) {
img, _, err := image.Decode(bytes.NewReader(blob))
if err != nil {
return nil, nil, err
}
tex, err := InitWinTextureFromImage(img)
return tex, img, err
}
func InitWinTextureFromFile(path string) (*WinTexture, image.Image, error) {
imgFile, err := os.Open(path)
if err != nil {
return nil, nil, err
}
defer imgFile.Close()
img, _, err := image.Decode(imgFile)
if err != nil {
return nil, nil, err
}
tex, err := InitWinTextureFromImage(img)
return tex, img, err
}
func (tex *WinTexture) Destroy() {
if tex.id > 0 {
gl.DeleteTextures(1, &tex.id)
}
}
func (tex *WinTexture) DrawQuad(coord OsV4, depth int, cd OsCd) {
tex.DrawQuadUV(coord, depth, cd, OsV2f{}, OsV2f{1, 1})
}
func _WinTexture_drawQuadNoUVs(coord OsV4, depth int) {
s := coord.Start
e := coord.End()
gl.Vertex3f(float32(s.X), float32(s.Y), float32(depth))
gl.Vertex3f(float32(e.X), float32(s.Y), float32(depth))
gl.Vertex3f(float32(e.X), float32(e.Y), float32(depth))
gl.Vertex3f(float32(s.X), float32(e.Y), float32(depth))
}
func _WinTexture_drawQuadNoUVs_cd(coord OsV4, depth int, cd OsCd, alphas [4]byte) {
s := coord.Start
e := coord.End()
gl.Color4ub(cd.R, cd.G, cd.B, alphas[0])
gl.Vertex3f(float32(s.X), float32(s.Y), float32(depth))
gl.Color4ub(cd.R, cd.G, cd.B, alphas[1])
gl.Vertex3f(float32(e.X), float32(s.Y), float32(depth))
gl.Color4ub(cd.R, cd.G, cd.B, alphas[2])
gl.Vertex3f(float32(e.X), float32(e.Y), float32(depth))
gl.Color4ub(cd.R, cd.G, cd.B, alphas[3])
gl.Vertex3f(float32(s.X), float32(e.Y), float32(depth))
}
func (tex *WinTexture) DrawQuadUV(coord OsV4, depth int, cd OsCd, sUV, eUV OsV2f) {
gl.Color4ub(cd.R, cd.G, cd.B, cd.A)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex.id)
gl.Begin(gl.QUADS)
{
s := coord.Start
e := coord.End()
gl.TexCoord2f(sUV.X, sUV.Y)
gl.Vertex3f(float32(s.X), float32(s.Y), float32(depth))
gl.TexCoord2f(eUV.X, sUV.Y)
gl.Vertex3f(float32(e.X), float32(s.Y), float32(depth))
gl.TexCoord2f(eUV.X, eUV.Y)
gl.Vertex3f(float32(e.X), float32(e.Y), float32(depth))
gl.TexCoord2f(sUV.X, eUV.Y)
gl.Vertex3f(float32(s.X), float32(e.Y), float32(depth))
}
gl.End()
gl.BindTexture(gl.TEXTURE_2D, 0) //Unbind
}
func (tex *WinTexture) DrawPointsUV(pts [4]OsV2f, uvs [4]OsV2f, depth int, cd OsCd) {
gl.Color4ub(cd.R, cd.G, cd.B, cd.A)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex.id)
gl.Begin(gl.QUADS)
{
for i := 0; i < 4; i++ {
gl.TexCoord2f(uvs[i].X, uvs[i].Y)
gl.Vertex3f(float32(pts[i].X), float32(pts[i].Y), float32(depth))
}
}
gl.End()
gl.BindTexture(gl.TEXTURE_2D, 0) //Unbind
}