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Improve alphablending example

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This commit is contained in:
Hajime Hoshi 2014-12-20 19:11:06 +09:00
parent df35a0ce1e
commit d4cd858eeb
3 changed files with 14 additions and 16 deletions
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15
example/alphablending/main.go
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@ -37,16 +37,19 @@ type Game struct {
func (g *Game) Update(gr ebiten.GraphicsContext) error {
g.count++
g.count %= 120
diff := float64(g.count) * 0.5
if 60 < g.count {
diff = float64(120-g.count) * 0.5
g.count %= 600
diff := float64(g.count) * 0.2
switch {
case 480 < g.count:
diff = 0
case 240 < g.count:
diff = float64(480-g.count) * 0.2
}
gr.PushRenderTarget(g.tmpRenderTarget)
gr.Clear()
for i := 0; i < 10; i++ {
geo := ebiten.TranslateGeometry(15+float64(i)*(20+diff), 20)
geo := ebiten.TranslateGeometry(15+float64(i)*(diff), 20)
clr := ebiten.ScaleColor(color.RGBA{0xff, 0xff, 0xff, 0x80})
ebiten.DrawWholeTexture(gr, g.ebitenTexture, geo, clr)
}
@ -54,7 +57,7 @@ func (g *Game) Update(gr ebiten.GraphicsContext) error {
gr.Fill(color.RGBA{0x00, 0x00, 0x80, 0xff})
for i := 0; i < 10; i++ {
geo := ebiten.TranslateGeometry(0, float64(i)*(10+diff))
geo := ebiten.TranslateGeometry(0, float64(i)*(diff))
clr := ebiten.ColorMatrixI()
ebiten.DrawWholeTexture(gr, g.tmpRenderTarget.Texture(), geo, clr)
}

2
graphicscontext.go
View File

@ -96,6 +96,8 @@ func (c *graphicsContext) preUpdate() {
func (c *graphicsContext) postUpdate() {
c.PopRenderTarget()
// We don't need to clear the default render target (framebuffer).
// For the default framebuffer, a special shader is used.
scale := float64(c.screenScale)
geo := ScaleGeometry(scale, scale)
clr := ColorMatrixI()

13
internal/opengl/rendertarget.go
View File

@ -86,22 +86,15 @@ func createFramebuffer(nativeTexture gl.Texture) (gl.Framebuffer, error) {
framebuffer := gl.GenFramebuffer()
framebuffer.Bind()
if err := framebufferTexture(nativeTexture); err != nil {
return 0, err
}
return framebuffer, nil
}
func framebufferTexture(nativeTexture gl.Texture) error {
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, nativeTexture, 0)
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
return errors.New("creating framebuffer failed")
return 0, errors.New("creating framebuffer failed")
}
gl.ClearColor(0, 0, 0, 0)
gl.Clear(gl.COLOR_BUFFER_BIT)
return nil
return framebuffer, nil
}
func (r *RenderTarget) SetAsViewport() error {