mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-13 22:47:26 +01:00
463 lines
13 KiB
Go
463 lines
13 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build js
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package opengl
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import (
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"errors"
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"fmt"
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"github.com/gopherjs/gopherwasm/js"
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)
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type (
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Texture js.Value
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Framebuffer js.Value
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Shader js.Value
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Buffer js.Value
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uniformLocation js.Value
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attribLocation int
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programID int
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Program struct {
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value js.Value
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id programID
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}
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)
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var InvalidTexture = Texture(js.Null())
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func getProgramID(p Program) programID {
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return p.id
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}
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var (
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blend js.Value
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clampToEdge js.Value
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colorAttachment0 js.Value
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compileStatus js.Value
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framebuffer js.Value
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framebufferBinding js.Value
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framebufferComplete js.Value
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linkStatus js.Value
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maxTextureSize js.Value
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nearest js.Value
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noError js.Value
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texture2d js.Value
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textureMagFilter js.Value
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textureMinFilter js.Value
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textureWrapS js.Value
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textureWrapT js.Value
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rgba js.Value
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unpackAlignment js.Value
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unsignedByte js.Value
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unsignedShort js.Value
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)
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func init() {
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// Accessing the prototype is rquired on Safari.
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c := js.Global().Get("WebGLRenderingContext").Get("prototype")
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VertexShader = ShaderType(c.Get("VERTEX_SHADER").Int())
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FragmentShader = ShaderType(c.Get("FRAGMENT_SHADER").Int())
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ArrayBuffer = BufferType(c.Get("ARRAY_BUFFER").Int())
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ElementArrayBuffer = BufferType(c.Get("ELEMENT_ARRAY_BUFFER").Int())
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DynamicDraw = BufferUsage(c.Get("DYNAMIC_DRAW").Int())
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Triangles = Mode(c.Get("TRIANGLES").Int())
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Lines = Mode(c.Get("LINES").Int())
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Short = DataType(c.Get("SHORT").Int())
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Float = DataType(c.Get("FLOAT").Int())
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zero = operation(c.Get("ZERO").Int())
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one = operation(c.Get("ONE").Int())
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srcAlpha = operation(c.Get("SRC_ALPHA").Int())
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dstAlpha = operation(c.Get("DST_ALPHA").Int())
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oneMinusSrcAlpha = operation(c.Get("ONE_MINUS_SRC_ALPHA").Int())
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oneMinusDstAlpha = operation(c.Get("ONE_MINUS_DST_ALPHA").Int())
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blend = c.Get("BLEND")
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clampToEdge = c.Get("CLAMP_TO_EDGE")
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compileStatus = c.Get("COMPILE_STATUS")
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colorAttachment0 = c.Get("COLOR_ATTACHMENT0")
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framebuffer = c.Get("FRAMEBUFFER")
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framebufferBinding = c.Get("FRAMEBUFFER_BINDING")
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framebufferComplete = c.Get("FRAMEBUFFER_COMPLETE")
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linkStatus = c.Get("LINK_STATUS")
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maxTextureSize = c.Get("MAX_TEXTURE_SIZE")
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nearest = c.Get("NEAREST")
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noError = c.Get("NO_ERROR")
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rgba = c.Get("RGBA")
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texture2d = c.Get("TEXTURE_2D")
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textureMagFilter = c.Get("TEXTURE_MAG_FILTER")
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textureMinFilter = c.Get("TEXTURE_MIN_FILTER")
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textureWrapS = c.Get("TEXTURE_WRAP_S")
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textureWrapT = c.Get("TEXTURE_WRAP_T")
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unpackAlignment = c.Get("UNPACK_ALIGNMENT")
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unsignedByte = c.Get("UNSIGNED_BYTE")
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unsignedShort = c.Get("UNSIGNED_SHORT")
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}
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type context struct {
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gl js.Value
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loseContext js.Value
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lastProgramID programID
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}
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func Init() error {
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if js.Global().Get("WebGLRenderingContext") == js.Undefined() {
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return fmt.Errorf("opengl: WebGL is not supported")
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}
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// TODO: Define id?
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canvas := js.Global().Get("document").Call("querySelector", "canvas")
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attr := js.Global().Get("Object").New()
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attr.Set("alpha", true)
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attr.Set("premultipliedAlpha", true)
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gl := canvas.Call("getContext", "webgl", attr)
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if gl == js.Null() {
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gl = canvas.Call("getContext", "experimental-webgl", attr)
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if gl == js.Null() {
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return fmt.Errorf("opengl: getContext failed")
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}
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}
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c := &Context{}
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c.gl = gl
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// Getting an extension might fail after the context is lost, so
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// it is required to get the extension here.
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c.loseContext = gl.Call("getExtension", "WEBGL_lose_context")
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theContext = c
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return nil
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}
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func (c *Context) Reset() error {
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c.locationCache = newLocationCache()
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c.lastTexture = Texture(js.Null())
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c.lastFramebuffer = Framebuffer(js.Null())
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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c.lastCompositeMode = CompositeModeUnknown
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gl := c.gl
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gl.Call("enable", blend)
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c.BlendFunc(CompositeModeSourceOver)
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f := gl.Call("getParameter", framebufferBinding)
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c.screenFramebuffer = Framebuffer(f)
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return nil
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}
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func (c *Context) BlendFunc(mode CompositeMode) {
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if c.lastCompositeMode == mode {
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return
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}
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c.lastCompositeMode = mode
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s, d := operations(mode)
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gl := c.gl
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gl.Call("blendFunc", int(s), int(d))
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}
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func (c *Context) NewTexture(width, height int) (Texture, error) {
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gl := c.gl
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t := gl.Call("createTexture")
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if t == js.Null() {
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return Texture(js.Null()), errors.New("opengl: glGenTexture failed")
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}
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gl.Call("pixelStorei", unpackAlignment, 4)
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c.BindTexture(Texture(t))
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gl.Call("texParameteri", texture2d, textureMagFilter, nearest)
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gl.Call("texParameteri", texture2d, textureMinFilter, nearest)
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gl.Call("texParameteri", texture2d, textureWrapS, clampToEdge)
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gl.Call("texParameteri", texture2d, textureWrapT, clampToEdge)
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// void texImage2D(GLenum target, GLint level, GLenum internalformat,
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// GLsizei width, GLsizei height, GLint border, GLenum format,
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// GLenum type, ArrayBufferView? pixels);
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gl.Call("texImage2D", texture2d, 0, rgba, width, height, 0, rgba, unsignedByte, nil)
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return Texture(t), nil
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}
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func (c *Context) bindFramebufferImpl(f Framebuffer) {
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gl := c.gl
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gl.Call("bindFramebuffer", framebuffer, js.Value(f))
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}
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func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]byte, error) {
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gl := c.gl
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c.bindFramebuffer(f)
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pixels := make([]byte, 4*width*height)
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p := js.TypedArrayOf(pixels)
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gl.Call("readPixels", 0, 0, width, height, rgba, unsignedByte, p)
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p.Release()
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if e := gl.Call("getError"); e.Int() != noError.Int() {
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return nil, errors.New(fmt.Sprintf("opengl: error: %d", e))
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}
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return pixels, nil
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}
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func (c *Context) bindTextureImpl(t Texture) {
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gl := c.gl
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gl.Call("bindTexture", texture2d, js.Value(t))
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}
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func (c *Context) DeleteTexture(t Texture) {
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gl := c.gl
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if !gl.Call("isTexture", js.Value(t)).Bool() {
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return
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}
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if c.lastTexture == t {
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c.lastTexture = Texture(js.Null())
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}
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gl.Call("deleteTexture", js.Value(t))
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}
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func (c *Context) IsTexture(t Texture) bool {
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gl := c.gl
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return gl.Call("isTexture", js.Value(t)).Bool()
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}
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func (c *Context) TexSubImage2D(pixels []byte, x, y, width, height int) {
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gl := c.gl
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// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
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// GLsizei width, GLsizei height,
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// GLenum format, GLenum type, ArrayBufferView? pixels);
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p := js.TypedArrayOf(pixels)
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gl.Call("texSubImage2D", texture2d, 0, x, y, width, height, rgba, unsignedByte, p)
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p.Release()
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}
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func (c *Context) NewFramebuffer(t Texture) (Framebuffer, error) {
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gl := c.gl
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f := gl.Call("createFramebuffer")
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c.bindFramebuffer(Framebuffer(f))
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gl.Call("framebufferTexture2D", framebuffer, colorAttachment0, texture2d, js.Value(t), 0)
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if s := gl.Call("checkFramebufferStatus", framebuffer); s.Int() != framebufferComplete.Int() {
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return Framebuffer(js.Null()), errors.New(fmt.Sprintf("opengl: creating framebuffer failed: %d", s.Int()))
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}
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return Framebuffer(f), nil
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}
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func (c *Context) setViewportImpl(width, height int) {
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gl := c.gl
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gl.Call("viewport", 0, 0, width, height)
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}
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func (c *Context) DeleteFramebuffer(f Framebuffer) {
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gl := c.gl
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if !gl.Call("isFramebuffer", js.Value(f)).Bool() {
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return
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}
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// If a framebuffer to be deleted is bound, a newly bound framebuffer
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// will be a default framebuffer.
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// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
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if c.lastFramebuffer == f {
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c.lastFramebuffer = Framebuffer(js.Null())
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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}
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gl.Call("deleteFramebuffer", js.Value(f))
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}
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func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
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gl := c.gl
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s := gl.Call("createShader", int(shaderType))
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if s == js.Null() {
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return Shader(js.Null()), fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
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}
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gl.Call("shaderSource", js.Value(s), source)
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gl.Call("compileShader", js.Value(s))
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if !gl.Call("getShaderParameter", js.Value(s), compileStatus).Bool() {
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log := gl.Call("getShaderInfoLog", js.Value(s))
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return Shader(js.Null()), fmt.Errorf("opengl: shader compile failed: %s", log)
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}
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return Shader(s), nil
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}
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func (c *Context) DeleteShader(s Shader) {
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gl := c.gl
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gl.Call("deleteShader", js.Value(s))
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}
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func (c *Context) NewProgram(shaders []Shader) (Program, error) {
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gl := c.gl
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v := gl.Call("createProgram")
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if v == js.Null() {
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return Program{}, errors.New("opengl: glCreateProgram failed")
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}
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for _, shader := range shaders {
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gl.Call("attachShader", v, js.Value(shader))
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}
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gl.Call("linkProgram", v)
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if !gl.Call("getProgramParameter", v, linkStatus).Bool() {
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return Program{}, errors.New("opengl: program error")
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}
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id := c.lastProgramID
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c.lastProgramID++
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return Program{
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value: v,
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id: id,
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}, nil
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}
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func (c *Context) UseProgram(p Program) {
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gl := c.gl
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gl.Call("useProgram", p.value)
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}
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func (c *Context) DeleteProgram(p Program) {
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gl := c.gl
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if !gl.Call("isProgram", p.value).Bool() {
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return
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}
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gl.Call("deleteProgram", p.value)
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}
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func (c *Context) getUniformLocationImpl(p Program, location string) uniformLocation {
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gl := c.gl
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return uniformLocation(gl.Call("getUniformLocation", p.value, location))
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}
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func (c *Context) UniformInt(p Program, location string, v int) {
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gl := c.gl
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l := c.locationCache.GetUniformLocation(c, p, location)
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gl.Call("uniform1i", js.Value(l), v)
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}
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func (c *Context) UniformFloat(p Program, location string, v float32) {
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gl := c.gl
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l := c.locationCache.GetUniformLocation(c, p, location)
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gl.Call("uniform1f", js.Value(l), v)
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}
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var (
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float32Array = js.Global().Get("Float32Array")
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)
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func (c *Context) UniformFloats(p Program, location string, v []float32) {
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gl := c.gl
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l := c.locationCache.GetUniformLocation(c, p, location)
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switch len(v) {
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case 2:
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gl.Call("uniform2f", js.Value(l), v[0], v[1])
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case 4:
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gl.Call("uniform4f", js.Value(l), v[0], v[1], v[2], v[3])
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case 16:
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arr := js.TypedArrayOf(v)
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gl.Call("uniformMatrix4fv", js.Value(l), false, arr)
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arr.Release()
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default:
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panic("not reached")
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}
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}
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func (c *Context) getAttribLocationImpl(p Program, location string) attribLocation {
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gl := c.gl
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return attribLocation(gl.Call("getAttribLocation", p.value, location).Int())
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}
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func (c *Context) VertexAttribPointer(p Program, location string, size int, dataType DataType, stride int, offset int) {
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gl := c.gl
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.Call("vertexAttribPointer", int(l), size, int(dataType), false, stride, offset)
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}
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func (c *Context) EnableVertexAttribArray(p Program, location string) {
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gl := c.gl
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.Call("enableVertexAttribArray", int(l))
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}
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func (c *Context) DisableVertexAttribArray(p Program, location string) {
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gl := c.gl
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.Call("disableVertexAttribArray", int(l))
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}
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func (c *Context) NewArrayBuffer(size int) Buffer {
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gl := c.gl
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b := gl.Call("createBuffer")
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gl.Call("bindBuffer", int(ArrayBuffer), js.Value(b))
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gl.Call("bufferData", int(ArrayBuffer), size, int(DynamicDraw))
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return Buffer(b)
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}
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func (c *Context) NewElementArrayBuffer(size int) Buffer {
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gl := c.gl
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b := gl.Call("createBuffer")
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gl.Call("bindBuffer", int(ElementArrayBuffer), js.Value(b))
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gl.Call("bufferData", int(ElementArrayBuffer), size, int(DynamicDraw))
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return Buffer(b)
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}
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func (c *Context) BindBuffer(bufferType BufferType, b Buffer) {
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gl := c.gl
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gl.Call("bindBuffer", int(bufferType), js.Value(b))
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}
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func (c *Context) ArrayBufferSubData(data []float32) {
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gl := c.gl
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arr := js.TypedArrayOf(data)
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gl.Call("bufferSubData", int(ArrayBuffer), 0, arr)
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arr.Release()
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}
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func (c *Context) ElementArrayBufferSubData(data []uint16) {
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gl := c.gl
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arr := js.TypedArrayOf(data)
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gl.Call("bufferSubData", int(ElementArrayBuffer), 0, arr)
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arr.Release()
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}
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func (c *Context) DeleteBuffer(b Buffer) {
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gl := c.gl
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gl.Call("deleteBuffer", js.Value(b))
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}
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func (c *Context) DrawElements(mode Mode, len int, offsetInBytes int) {
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gl := c.gl
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gl.Call("drawElements", int(mode), len, unsignedShort, offsetInBytes)
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}
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func (c *Context) maxTextureSizeImpl() int {
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gl := c.gl
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return gl.Call("getParameter", maxTextureSize).Int()
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}
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func (c *Context) Flush() {
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gl := c.gl
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gl.Call("flush")
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}
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func (c *Context) IsContextLost() bool {
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gl := c.gl
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return gl.Call("isContextLost").Bool()
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}
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func (c *Context) RestoreContext() {
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if c.loseContext != js.Null() {
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c.loseContext.Call("restoreContext")
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}
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}
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