mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
482 lines
14 KiB
Go
482 lines
14 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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"syscall/js"
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"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/jsutil"
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"github.com/hajimehoshi/ebiten/internal/web"
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)
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type (
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textureNative js.Value
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framebufferNative 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 = textureNative(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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// Accessing the prototype is rquired on Safari.
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contextPrototype = js.Global().Get("WebGLRenderingContext").Get("prototype")
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vertexShader = shaderType(contextPrototype.Get("VERTEX_SHADER").Int())
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fragmentShader = shaderType(contextPrototype.Get("FRAGMENT_SHADER").Int())
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arrayBuffer = bufferType(contextPrototype.Get("ARRAY_BUFFER").Int())
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elementArrayBuffer = bufferType(contextPrototype.Get("ELEMENT_ARRAY_BUFFER").Int())
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dynamicDraw = bufferUsage(contextPrototype.Get("DYNAMIC_DRAW").Int())
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short = dataType(contextPrototype.Get("SHORT").Int())
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float = dataType(contextPrototype.Get("FLOAT").Int())
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zero = operation(contextPrototype.Get("ZERO").Int())
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one = operation(contextPrototype.Get("ONE").Int())
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srcAlpha = operation(contextPrototype.Get("SRC_ALPHA").Int())
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dstAlpha = operation(contextPrototype.Get("DST_ALPHA").Int())
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oneMinusSrcAlpha = operation(contextPrototype.Get("ONE_MINUS_SRC_ALPHA").Int())
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oneMinusDstAlpha = operation(contextPrototype.Get("ONE_MINUS_DST_ALPHA").Int())
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blend = contextPrototype.Get("BLEND")
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clampToEdge = contextPrototype.Get("CLAMP_TO_EDGE")
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compileStatus = contextPrototype.Get("COMPILE_STATUS")
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colorAttachment0 = contextPrototype.Get("COLOR_ATTACHMENT0")
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framebuffer_ = contextPrototype.Get("FRAMEBUFFER")
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framebufferBinding = contextPrototype.Get("FRAMEBUFFER_BINDING")
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framebufferComplete = contextPrototype.Get("FRAMEBUFFER_COMPLETE")
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highFloat = contextPrototype.Get("HIGH_FLOAT")
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linkStatus = contextPrototype.Get("LINK_STATUS")
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maxTextureSize = contextPrototype.Get("MAX_TEXTURE_SIZE")
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nearest = contextPrototype.Get("NEAREST")
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noError = contextPrototype.Get("NO_ERROR")
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rgba = contextPrototype.Get("RGBA")
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texture2d = contextPrototype.Get("TEXTURE_2D")
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textureMagFilter = contextPrototype.Get("TEXTURE_MAG_FILTER")
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textureMinFilter = contextPrototype.Get("TEXTURE_MIN_FILTER")
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textureWrapS = contextPrototype.Get("TEXTURE_WRAP_S")
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textureWrapT = contextPrototype.Get("TEXTURE_WRAP_T")
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triangles = contextPrototype.Get("TRIANGLES")
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unpackAlignment = contextPrototype.Get("UNPACK_ALIGNMENT")
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unsignedByte = contextPrototype.Get("UNSIGNED_BYTE")
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unsignedShort = contextPrototype.Get("UNSIGNED_SHORT")
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)
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// temporaryBuffer is a temporary buffer used at gl.readPixels.
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// The read data is converted to Go's byte slice as soon as possible.
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// To avoid often allocating ArrayBuffer, reuse the buffer whenever possible.
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var temporaryBuffer = js.Global().Get("ArrayBuffer").New(16)
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type contextImpl struct {
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gl js.Value
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lastProgramID programID
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}
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func (c *context) ensureGL() {
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if c.gl != (js.Value{}) {
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return
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}
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if js.Global().Get("WebGLRenderingContext") == js.Undefined() {
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panic("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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panic("opengl: getContext failed")
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}
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}
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c.gl = gl
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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 = textureNative(js.Null())
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c.lastFramebuffer = framebufferNative(js.Null())
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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c.lastCompositeMode = driver.CompositeModeUnknown
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c.gl = js.Value{}
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c.ensureGL()
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if c.gl.Call("isContextLost").Bool() {
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return fmt.Errorf("opengl: the context is lost")
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}
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gl := c.gl
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gl.Call("enable", blend)
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c.blendFunc(driver.CompositeModeSourceOver)
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f := gl.Call("getParameter", framebufferBinding)
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c.screenFramebuffer = framebufferNative(f)
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return nil
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}
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func (c *context) blendFunc(mode driver.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 := mode.Operations()
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s2, d2 := convertOperation(s), convertOperation(d)
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c.ensureGL()
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gl := c.gl
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gl.Call("blendFunc", int(s2), int(d2))
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}
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func (c *context) newTexture(width, height int) (textureNative, error) {
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c.ensureGL()
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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 textureNative(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(textureNative(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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// Firefox warns the usage of textures without specifying pixels (#629)
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//
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// Error: WebGL warning: drawElements: This operation requires zeroing texture data. This is slow.
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//
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// In Ebiten, textures are filled with pixels laster by the filter that ignores destination, so it is fine
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// to leave textures as uninitialized here. Rather, extra memory allocating for initialization should be
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// avoided.
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gl.Call("texImage2D", texture2d, 0, rgba, width, height, 0, rgba, unsignedByte, nil)
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return textureNative(t), nil
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}
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func (c *context) bindFramebufferImpl(f framebufferNative) {
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c.ensureGL()
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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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c.ensureGL()
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gl := c.gl
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c.bindFramebuffer(f.native)
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l := 4 * width * height
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if bufl := temporaryBuffer.Get("byteLength").Int(); bufl < l {
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for bufl < l {
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bufl *= 2
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}
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temporaryBuffer = js.Global().Get("ArrayBuffer").New(bufl)
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}
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p := js.Global().Get("Uint8Array").New(temporaryBuffer, 0, l)
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gl.Call("readPixels", 0, 0, width, height, rgba, unsignedByte, p)
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return jsutil.Uint8ArrayToSlice(p), nil
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}
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func (c *context) bindTextureImpl(t textureNative) {
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c.ensureGL()
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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 textureNative) {
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c.ensureGL()
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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 = textureNative(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 textureNative) bool {
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c.ensureGL()
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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(t textureNative, pixels []byte, x, y, width, height int) {
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c.bindTexture(t)
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c.ensureGL()
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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, free := jsutil.SliceToTypedArray(pixels)
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gl.Call("texSubImage2D", texture2d, 0, x, y, width, height, rgba, unsignedByte, p)
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free()
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}
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func (c *context) newFramebuffer(t textureNative) (framebufferNative, error) {
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c.ensureGL()
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gl := c.gl
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f := gl.Call("createFramebuffer")
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c.bindFramebuffer(framebufferNative(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 framebufferNative(js.Null()), errors.New(fmt.Sprintf("opengl: creating framebuffer failed: %d", s.Int()))
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}
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return framebufferNative(f), nil
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}
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func (c *context) setViewportImpl(width, height int) {
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c.ensureGL()
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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 framebufferNative) {
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c.ensureGL()
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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 = framebufferNative(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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c.ensureGL()
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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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c.ensureGL()
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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, attributes []string) (program, error) {
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c.ensureGL()
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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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for i, name := range attributes {
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gl.Call("bindAttribLocation", v, i, name)
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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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c.ensureGL()
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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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c.ensureGL()
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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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c.ensureGL()
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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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c.ensureGL()
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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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c.ensureGL()
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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 (c *context) uniformFloats(p program, location string, v []float32) {
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c.ensureGL()
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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, free := jsutil.SliceToTypedArray(v)
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gl.Call("uniformMatrix4fv", js.Value(l), false, arr)
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free()
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default:
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panic(fmt.Sprintf("opengl: invalid uniform floats num: %d", len(v)))
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}
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}
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func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
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c.ensureGL()
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gl := c.gl
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gl.Call("vertexAttribPointer", index, size, int(dataType), false, stride, offset)
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}
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func (c *context) enableVertexAttribArray(p program, index int) {
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c.ensureGL()
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gl := c.gl
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gl.Call("enableVertexAttribArray", index)
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}
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func (c *context) disableVertexAttribArray(p program, index int) {
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c.ensureGL()
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gl := c.gl
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gl.Call("disableVertexAttribArray", index)
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}
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func (c *context) newArrayBuffer(size int) buffer {
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c.ensureGL()
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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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c.ensureGL()
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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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c.ensureGL()
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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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c.ensureGL()
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gl := c.gl
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arr, free := jsutil.SliceToTypedArray(data)
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gl.Call("bufferSubData", int(arrayBuffer), 0, arr)
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free()
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}
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func (c *context) elementArrayBufferSubData(data []uint16) {
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c.ensureGL()
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gl := c.gl
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arr, free := jsutil.SliceToTypedArray(data)
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gl.Call("bufferSubData", int(elementArrayBuffer), 0, arr)
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free()
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}
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func (c *context) deleteBuffer(b buffer) {
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c.ensureGL()
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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(len int, offsetInBytes int) {
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c.ensureGL()
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gl := c.gl
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gl.Call("drawElements", triangles, len, unsignedShort, offsetInBytes)
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}
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func (c *context) maxTextureSizeImpl() int {
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c.ensureGL()
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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) getShaderPrecisionFormatPrecision() int {
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c.ensureGL()
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gl := c.gl
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return gl.Call("getShaderPrecisionFormat", js.ValueOf(int(fragmentShader)), highFloat).Get("precision").Int()
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}
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func (c *context) flush() {
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c.ensureGL()
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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) needsRestoring() bool {
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return !web.IsMobileBrowser()
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}
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