twitchapon-anim

Basic Twitchapon Receiver/Visuals
git clone git://bsandro.tech/twitchapon-anim
Log | Files | Refs | README | LICENSE

image.go (3410B)


      1 // Copyright 2018 The Ebiten Authors
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //     http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 package opengl
     16 
     17 import (
     18 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
     19 	"github.com/hajimehoshi/ebiten/v2/internal/graphics"
     20 )
     21 
     22 type Image struct {
     23 	id            driver.ImageID
     24 	graphics      *Graphics
     25 	textureNative textureNative
     26 	framebuffer   *framebuffer
     27 	pbo           buffer
     28 	width         int
     29 	height        int
     30 	screen        bool
     31 }
     32 
     33 func (i *Image) ID() driver.ImageID {
     34 	return i.id
     35 }
     36 
     37 func (i *Image) IsInvalidated() bool {
     38 	return !i.graphics.context.isTexture(i.textureNative)
     39 }
     40 
     41 func (i *Image) Dispose() {
     42 	if !i.pbo.equal(*new(buffer)) {
     43 		i.graphics.context.deleteBuffer(i.pbo)
     44 	}
     45 	if i.framebuffer != nil {
     46 		i.framebuffer.delete(&i.graphics.context)
     47 	}
     48 	if !i.textureNative.equal(*new(textureNative)) {
     49 		i.graphics.context.deleteTexture(i.textureNative)
     50 	}
     51 
     52 	i.graphics.removeImage(i)
     53 }
     54 
     55 func (i *Image) setViewport() error {
     56 	if err := i.ensureFramebuffer(); err != nil {
     57 		return err
     58 	}
     59 	i.graphics.context.setViewport(i.framebuffer)
     60 	return nil
     61 }
     62 
     63 func (i *Image) Pixels() ([]byte, error) {
     64 	if err := i.ensureFramebuffer(); err != nil {
     65 		return nil, err
     66 	}
     67 	p, err := i.graphics.context.framebufferPixels(i.framebuffer, i.width, i.height)
     68 	if err != nil {
     69 		return nil, err
     70 	}
     71 	return p, nil
     72 }
     73 
     74 func (i *Image) framebufferSize() (int, int) {
     75 	if i.screen {
     76 		// The (default) framebuffer size can't be converted to a power of 2.
     77 		// On browsers, i.width and i.height are used as viewport size and
     78 		// Edge can't treat a bigger viewport than the drawing area (#71).
     79 		return i.width, i.height
     80 	}
     81 	return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
     82 }
     83 
     84 func (i *Image) ensureFramebuffer() error {
     85 	if i.framebuffer != nil {
     86 		return nil
     87 	}
     88 
     89 	w, h := i.framebufferSize()
     90 	if i.screen {
     91 		i.framebuffer = newScreenFramebuffer(&i.graphics.context, w, h)
     92 		return nil
     93 	}
     94 	f, err := newFramebufferFromTexture(&i.graphics.context, i.textureNative, w, h)
     95 	if err != nil {
     96 		return err
     97 	}
     98 	i.framebuffer = f
     99 	return nil
    100 }
    101 
    102 func (i *Image) ReplacePixels(args []*driver.ReplacePixelsArgs) {
    103 	if i.screen {
    104 		panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
    105 	}
    106 	if len(args) == 0 {
    107 		return
    108 	}
    109 
    110 	// glFlush is necessary on Android.
    111 	// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
    112 	if i.graphics.drawCalled {
    113 		i.graphics.context.flush()
    114 	}
    115 	i.graphics.drawCalled = false
    116 
    117 	w, h := i.width, i.height
    118 	if !i.graphics.context.canUsePBO() {
    119 		i.graphics.context.texSubImage2D(i.textureNative, w, h, args)
    120 		return
    121 	}
    122 	if i.pbo.equal(*new(buffer)) {
    123 		i.pbo = i.graphics.context.newPixelBufferObject(w, h)
    124 	}
    125 	if i.pbo.equal(*new(buffer)) {
    126 		panic("opengl: newPixelBufferObject failed")
    127 	}
    128 
    129 	i.graphics.context.replacePixelsWithPBO(i.pbo, i.textureNative, w, h, args)
    130 }