forked from hajimehoshi/ebiten
/
gamecontext.go
92 lines (86 loc) · 2.7 KB
/
gamecontext.go
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// Copyright 2014 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 ebiten
import (
audio "github.com/hajimehoshi/ebiten/exp/audio/inner"
"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
"github.com/hajimehoshi/ebiten/internal/ui"
"image"
)
var glContext *opengl.Context
func init() {
ui.Init()
ui.ExecOnUIThread(func() {
glContext = opengl.NewContext()
})
audio.Init()
}
// NewImage returns an empty image.
//
// NewImage generates a new texture and a new framebuffer.
// Be careful that image objects will never be released
// even though nothing refers the image object and GC works.
// It is because there is no way to define finalizers for Go objects if you use GopherJS.
func NewImage(width, height int, filter Filter) (*Image, error) {
var img *Image
var err error
useGLContext(func(c *opengl.Context) {
var texture *graphics.Texture
var framebuffer *graphics.Framebuffer
texture, err = graphics.NewTexture(c, width, height, glFilter(c, filter))
if err != nil {
return
}
framebuffer, err = graphics.NewFramebufferFromTexture(c, texture)
if err != nil {
return
}
img = &Image{framebuffer: framebuffer, texture: texture}
})
if err != nil {
return nil, err
}
if err := img.Clear(); err != nil {
return nil, err
}
return img, nil
}
// NewImageFromImage creates a new image with the given image (img).
//
// NewImageFromImage generates a new texture and a new framebuffer.
// Be careful that image objects will never be released
// even though nothing refers the image object and GC works.
// It is because there is no way to define finalizers for Go objects if you use GopherJS.
func NewImageFromImage(img image.Image, filter Filter) (*Image, error) {
var eimg *Image
var err error
useGLContext(func(c *opengl.Context) {
var texture *graphics.Texture
var framebuffer *graphics.Framebuffer
texture, err = graphics.NewTextureFromImage(c, img, glFilter(c, filter))
if err != nil {
return
}
framebuffer, err = graphics.NewFramebufferFromTexture(c, texture)
if err != nil {
return
}
eimg = &Image{framebuffer: framebuffer, texture: texture}
})
if err != nil {
return nil, err
}
return eimg, nil
}