/
command.go
270 lines (244 loc) · 6.67 KB
/
command.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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file 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 graphics
import (
"errors"
"fmt"
"image"
"image/color"
"image/draw"
"math"
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
)
type command interface {
Exec(context *opengl.Context) error
}
type commandQueue struct {
commands []command
indexOffsetInBytes int
}
var theCommandQueue = &commandQueue{
commands: []command{},
}
func (q *commandQueue) Enqueue(command command) {
q.commands = append(q.commands, command)
}
func (q *commandQueue) Flush(context *opengl.Context) error {
q.indexOffsetInBytes = 0
vertices := []int16{}
for _, c := range q.commands {
switch c := c.(type) {
case *drawImageCommand:
vertices = append(vertices, c.vertices...)
}
}
if 0 < len(vertices) {
context.BufferSubData(context.ArrayBuffer, vertices)
}
// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
// Let's use them to compare to len(quads) in the future.
if MaxQuads < len(vertices)/16 {
return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", MaxQuads))
}
for _, c := range q.commands {
if err := c.Exec(context); err != nil {
return err
}
}
q.commands = []command{}
return nil
}
func FlushCommands(context *opengl.Context) error {
return theCommandQueue.Flush(context)
}
type fillCommand struct {
dst *Image
color color.Color
}
func (c *fillCommand) Exec(context *opengl.Context) error {
if err := c.dst.framebuffer.setAsViewport(context); err != nil {
return err
}
cr, cg, cb, ca := c.color.RGBA()
const max = math.MaxUint16
r := float64(cr) / max
g := float64(cg) / max
b := float64(cb) / max
a := float64(ca) / max
return context.FillFramebuffer(r, g, b, a)
}
type drawImageCommand struct {
dst *Image
src *Image
vertices []int16
geo Matrix
color Matrix
mode opengl.CompositeMode
}
func (c *drawImageCommand) Exec(context *opengl.Context) error {
if err := c.dst.framebuffer.setAsViewport(context); err != nil {
return err
}
context.BlendFunc(c.mode)
n := len(c.vertices) / 16
if n == 0 {
return nil
}
p := programContext{
state: &theOpenGLState,
program: theOpenGLState.programTexture,
context: context,
projectionMatrix: glMatrix(c.dst.framebuffer.projectionMatrix()),
texture: c.src.texture.native,
geoM: c.geo,
colorM: c.color,
}
p.begin()
defer p.end()
// TODO: We should call glBindBuffer here?
// The buffer is already bound at begin() but it is counterintuitive.
context.DrawElements(context.Triangles, 6*n, theCommandQueue.indexOffsetInBytes)
theCommandQueue.indexOffsetInBytes += 6 * n * 2
return nil
}
type replacePixelsCommand struct {
dst *Image
pixels []uint8
}
func (c *replacePixelsCommand) Exec(context *opengl.Context) error {
// Filling with non black or white color is required here for glTexSubImage2D.
// Very mysterious but this actually works (Issue #186)
if err := c.dst.framebuffer.setAsViewport(context); err != nil {
return err
}
if err := context.FillFramebuffer(0, 0, 0.5, 1); err != nil {
return err
}
context.BindTexture(c.dst.texture.native)
context.TexSubImage2D(c.pixels, c.dst.texture.width, c.dst.texture.height)
return nil
}
type disposeCommand struct {
target *Image
}
func (c *disposeCommand) Exec(context *opengl.Context) error {
if c.target.framebuffer != nil && c.target.framebuffer.native != context.ScreenFramebuffer() {
context.DeleteFramebuffer(c.target.framebuffer.native)
}
if c.target.texture != nil {
context.DeleteTexture(c.target.texture.native)
}
return nil
}
type newImageFromImageCommand struct {
result *Image
img *image.RGBA
filter opengl.Filter
}
func adjustImageForTexture(img *image.RGBA) *image.RGBA {
width, height := img.Bounds().Size().X, img.Bounds().Size().Y
adjustedImageBounds := image.Rectangle{
image.ZP,
image.Point{
int(NextPowerOf2Int32(int32(width))),
int(NextPowerOf2Int32(int32(height))),
},
}
if img.Bounds() == adjustedImageBounds {
return img
}
adjustedImage := image.NewRGBA(adjustedImageBounds)
dstBounds := image.Rectangle{
image.ZP,
img.Bounds().Size(),
}
draw.Draw(adjustedImage, dstBounds, img, img.Bounds().Min, draw.Src)
return adjustedImage
}
func (c *newImageFromImageCommand) Exec(context *opengl.Context) error {
origSize := c.img.Bounds().Size()
if origSize.X < 4 {
return errors.New("graphics: width must be equal or more than 4.")
}
if origSize.Y < 4 {
return errors.New("graphics: height must be equal or more than 4.")
}
adjustedImage := adjustImageForTexture(c.img)
size := adjustedImage.Bounds().Size()
native, err := context.NewTexture(size.X, size.Y, adjustedImage.Pix, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
width: origSize.X,
height: origSize.Y,
}
c.result.framebuffer, err = newFramebufferFromTexture(context, c.result.texture)
if err != nil {
return err
}
return nil
}
type newImageCommand struct {
result *Image
width int
height int
filter opengl.Filter
}
func (c *newImageCommand) Exec(context *opengl.Context) error {
w := int(NextPowerOf2Int32(int32(c.width)))
h := int(NextPowerOf2Int32(int32(c.height)))
if w < 4 {
return errors.New("graphics: width must be equal or more than 4.")
}
if h < 4 {
return errors.New("graphics: height must be equal or more than 4.")
}
native, err := context.NewTexture(w, h, nil, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
width: c.width,
height: c.height,
}
c.result.framebuffer, err = newFramebufferFromTexture(context, c.result.texture)
if err != nil {
return err
}
return nil
}
type newScreenFramebufferImageCommand struct {
result *Image
width int
height int
}
func (c *newScreenFramebufferImageCommand) Exec(context *opengl.Context) error {
if c.width < 4 {
return errors.New("graphics: width must be equal or more than 4.")
}
if c.height < 4 {
return errors.New("graphics: height must be equal or more than 4.")
}
f := &framebuffer{
native: context.ScreenFramebuffer(),
width: c.width,
height: c.height,
flipY: true,
}
c.result.framebuffer = f
return nil
}