zorldo

Goofing around with Ebiten
git clone git://bsandro.tech/zorldo
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image.go (3442B)

      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 	texture     textureNative
     26 	stencil     renderbufferNative
     27 	framebuffer *framebuffer
     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.texture)
     39 }
     40 
     41 func (i *Image) Dispose() {
     42 	if i.framebuffer != nil {
     43 		i.framebuffer.delete(&i.graphics.context)
     44 	}
     45 	if !i.texture.equal(*new(textureNative)) {
     46 		i.graphics.context.deleteTexture(i.texture)
     47 	}
     48 	if !i.stencil.equal(*new(renderbufferNative)) {
     49 		i.graphics.context.deleteRenderbuffer(i.stencil)
     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 
     68 	p := i.graphics.context.framebufferPixels(i.framebuffer, i.width, i.height)
     69 	return p, nil
     70 }
     71 
     72 func (i *Image) framebufferSize() (int, int) {
     73 	if i.screen {
     74 		// The (default) framebuffer size can't be converted to a power of 2.
     75 		// On browsers, i.width and i.height are used as viewport size and
     76 		// Edge can't treat a bigger viewport than the drawing area (#71).
     77 		return i.width, i.height
     78 	}
     79 	return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
     80 }
     81 
     82 func (i *Image) ensureFramebuffer() error {
     83 	if i.framebuffer != nil {
     84 		return nil
     85 	}
     86 
     87 	w, h := i.framebufferSize()
     88 	if i.screen {
     89 		i.framebuffer = newScreenFramebuffer(&i.graphics.context, w, h)
     90 		return nil
     91 	}
     92 	f, err := newFramebufferFromTexture(&i.graphics.context, i.texture, w, h)
     93 	if err != nil {
     94 		return err
     95 	}
     96 	i.framebuffer = f
     97 	return nil
     98 }
     99 
    100 func (i *Image) ensureStencilBuffer() error {
    101 	if !i.stencil.equal(*new(renderbufferNative)) {
    102 		return nil
    103 	}
    104 
    105 	if err := i.ensureFramebuffer(); err != nil {
    106 		return err
    107 	}
    108 
    109 	r, err := i.graphics.context.newRenderbuffer(i.framebufferSize())
    110 	if err != nil {
    111 		return err
    112 	}
    113 	i.stencil = r
    114 
    115 	if err := i.graphics.context.bindStencilBuffer(i.framebuffer.native, i.stencil); err != nil {
    116 		return err
    117 	}
    118 	return nil
    119 }
    120 
    121 func (i *Image) ReplacePixels(args []*driver.ReplacePixelsArgs) {
    122 	if i.screen {
    123 		panic("opengl: ReplacePixels cannot be called on the screen, that doesn't have a texture")
    124 	}
    125 	if len(args) == 0 {
    126 		return
    127 	}
    128 
    129 	// glFlush is necessary on Android.
    130 	// glTexSubImage2D didn't work without this hack at least on Nexus 5x and NuAns NEO [Reloaded] (#211).
    131 	if i.graphics.drawCalled {
    132 		i.graphics.context.flush()
    133 	}
    134 	i.graphics.drawCalled = false
    135 	i.graphics.context.texSubImage2D(i.texture, args)
    136 }