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Add shader public APIs experimentally
Updates hajimehoshi#1168
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Copyright 2020 The Ebiten Authors | ||
| // | ||
| // 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. | ||
|
|
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| // +build example jsgo | ||
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| package main | ||
|
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| import ( | ||
| "log" | ||
|
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| "github.com/hajimehoshi/ebiten" | ||
| ) | ||
|
|
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| const ( | ||
| screenWidth = 640 | ||
| screenHeight = 480 | ||
| ) | ||
|
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| const shaderSrc = `package main | ||
| func Vertex(position vec2, texCoord vec2, color vec4) vec4 { | ||
| return mat4( | ||
| 2.0/640, 0, 0, 0, | ||
| 0, 2.0/480, 0, 0, | ||
| 0, 0, 1, 0, | ||
| -1, -1, 0, 1, | ||
| ) * vec4(position, 0, 1) | ||
| } | ||
| func Fragment(position vec4) vec4 { | ||
| return vec4(position.x/640, position.y/480, 0, 1) | ||
| }` | ||
|
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| type Game struct { | ||
| shader *ebiten.Shader | ||
| } | ||
|
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| func (g *Game) Update(screen *ebiten.Image) error { | ||
| if g.shader == nil { | ||
| var err error | ||
| g.shader, err = ebiten.NewShader([]byte(shaderSrc)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
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| func (g *Game) Draw(screen *ebiten.Image) { | ||
| w, h := screen.Size() | ||
| vs := []ebiten.Vertex{ | ||
| { | ||
| DstX: 0, | ||
| DstY: 0, | ||
| }, | ||
| { | ||
| DstX: float32(w), | ||
| DstY: 0, | ||
| }, | ||
| { | ||
| DstX: 0, | ||
| DstY: float32(h), | ||
| }, | ||
| { | ||
| DstX: float32(w), | ||
| DstY: float32(h), | ||
| }, | ||
| } | ||
| is := []uint16{0, 1, 2, 1, 2, 3} | ||
| screen.DrawTrianglesWithShader(vs, is, g.shader, nil) | ||
| } | ||
|
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| func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) { | ||
| return screenWidth, screenHeight | ||
| } | ||
|
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| func main() { | ||
| ebiten.SetWindowSize(screenWidth, screenHeight) | ||
| ebiten.SetWindowTitle("Shader (Ebiten Demo)") | ||
| if err := ebiten.RunGame(&Game{}); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| // Copyright 2020 The Ebiten Authors | ||
| // | ||
| // 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. | ||
|
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| package ebiten | ||
|
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| import ( | ||
| "github.com/hajimehoshi/ebiten/internal/buffered" | ||
| "github.com/hajimehoshi/ebiten/internal/shader" | ||
| ) | ||
|
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| type Shader struct { | ||
| shader *buffered.Shader | ||
| } | ||
|
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| func NewShader(src []byte) (*Shader, error) { | ||
| s, err := shader.Compile(src) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return &Shader{ | ||
| shader: buffered.NewShader(s), | ||
| }, nil | ||
| } | ||
|
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| func (s *Shader) Dispose() { | ||
| s.shader.MarkDisposed() | ||
| s.shader = nil | ||
| } |