mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
436 lines
12 KiB
Go
436 lines
12 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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"runtime"
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"github.com/hajimehoshi/gopherwasm/js"
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"github.com/hajimehoshi/ebiten/internal/web"
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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 interface{}
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Program interface{}
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Buffer interface{}
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uniformLocation js.Value
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)
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type attribLocation int
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type programID int
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var InvalidTexture = Texture(js.Null)
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func getProgramID(p Program) programID {
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return programID(p.(js.Value).Get("__ebiten_programId").Int())
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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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}
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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 web.IsNodeJS() {
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return fmt.Errorf("opengl: Node.js is not supported")
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}
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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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if c.loseContext != js.Null {
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// This testing function name is temporary.
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js.Global.Set("_ebiten_loseContextForTesting", js.NewCallback(func([]js.Value) {
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c.loseContext.Call("loseContext")
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}))
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}
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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", gl.Get("BLEND"))
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c.BlendFunc(CompositeModeSourceOver)
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f := gl.Call("getParameter", gl.Get("FRAMEBUFFER_BINDING"))
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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", gl.Get("UNPACK_ALIGNMENT"), 4)
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c.BindTexture(Texture(t))
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gl.Call("texParameteri", gl.Get("TEXTURE_2D"), gl.Get("TEXTURE_MAG_FILTER"), gl.Get("NEAREST"))
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gl.Call("texParameteri", gl.Get("TEXTURE_2D"), gl.Get("TEXTURE_MIN_FILTER"), gl.Get("NEAREST"))
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gl.Call("texParameteri", gl.Get("TEXTURE_2D"), gl.Get("TEXTURE_WRAP_S"), gl.Get("CLAMP_TO_EDGE"))
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gl.Call("texParameteri", gl.Get("TEXTURE_2D"), gl.Get("TEXTURE_WRAP_T"), gl.Get("CLAMP_TO_EDGE"))
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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", gl.Get("TEXTURE_2D"), 0, gl.Get("RGBA"), width, height, 0, gl.Get("RGBA"), gl.Get("UNSIGNED_BYTE"), 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", gl.Get("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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gl.Call("readPixels", 0, 0, width, height, gl.Get("RGBA"), gl.Get("UNSIGNED_BYTE"), pixels)
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if e := gl.Call("getError"); e.Int() != gl.Get("NO_ERROR").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", gl.Get("TEXTURE_2D"), 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(p []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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gl.Call("texSubImage2D", gl.Get("TEXTURE_2D"), 0, x, y, width, height, gl.Get("RGBA"), gl.Get("UNSIGNED_BYTE"), p)
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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", gl.Get("FRAMEBUFFER"), gl.Get("COLOR_ATTACHMENT0"), gl.Get("TEXTURE_2D"), js.Value(t), 0)
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if s := gl.Call("checkFramebufferStatus", gl.Get("FRAMEBUFFER")); s.Int() != gl.Get("FRAMEBUFFER_COMPLETE").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 nil, fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
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}
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gl.Call("shaderSource", s, source)
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gl.Call("compileShader", s)
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if !gl.Call("getShaderParameter", s, gl.Get("COMPILE_STATUS")).Bool() {
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log := gl.Call("getShaderInfoLog", s)
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return nil, fmt.Errorf("opengl: shader compile failed: %s", log)
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}
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return 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", 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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p := gl.Call("createProgram")
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if p == js.Null {
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return nil, errors.New("opengl: glCreateProgram failed")
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}
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p.Set("__ebiten_programId", int(c.lastProgramID))
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c.lastProgramID++
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for _, shader := range shaders {
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gl.Call("attachShader", p, shader)
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}
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gl.Call("linkProgram", p)
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if !gl.Call("getProgramParameter", p, gl.Get("LINK_STATUS")).Bool() {
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return nil, errors.New("opengl: program error")
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}
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return p, 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)
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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).Bool() {
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return
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}
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gl.Call("deleteProgram", p)
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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, 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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func float32sToValue(v []float32) js.Value {
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if runtime.GOARCH == "wasm" {
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return js.ValueOf(float32sToBytes(v))
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}
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a := js.Global.Get("Float32Array").New(len(v))
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for i, f32 := range v {
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a.SetIndex(i, f32)
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}
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return a
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}
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func uint16sToValue(v []uint16) js.Value {
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if runtime.GOARCH == "wasm" {
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return js.ValueOf(uint16sToBytes(v))
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}
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a := js.Global.Get("Uint16Array").New(len(v))
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for i, u16 := range v {
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a.SetIndex(i, u16)
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}
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return a
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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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m := js.Global.Get("Float32Array").New(16)
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for i := range v {
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m.SetIndex(i, v[i])
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}
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gl.Call("uniformMatrix4fv", js.Value(l), false, m)
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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, 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), b)
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gl.Call("bufferData", int(ArrayBuffer), size, int(DynamicDraw))
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return 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), b)
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gl.Call("bufferData", int(ElementArrayBuffer), size, int(DynamicDraw))
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return 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), 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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gl.Call("bufferSubData", int(ArrayBuffer), 0, float32sToValue(data))
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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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gl.Call("bufferSubData", int(ElementArrayBuffer), 0, uint16sToValue(data))
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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", 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, gl.Get("UNSIGNED_SHORT"), 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", gl.Get("MAX_TEXTURE_SIZE")).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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