ebiten/internal/graphicsdriver/opengl/context_js.go

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// Copyright 2014 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build js
package opengl
import (
"errors"
"fmt"
"syscall/js"
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"github.com/hajimehoshi/ebiten/internal/driver"
"github.com/hajimehoshi/ebiten/internal/jsutil"
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"github.com/hajimehoshi/ebiten/internal/web"
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)
type (
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textureNative js.Value
framebufferNative js.Value
shader js.Value
buffer js.Value
uniformLocation js.Value
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attribLocation int
programID int
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program struct {
value js.Value
id programID
}
)
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func (t textureNative) equal(rhs textureNative) bool {
return jsutil.Equal(js.Value(t), js.Value(rhs))
}
func (f framebufferNative) equal(rhs framebufferNative) bool {
return jsutil.Equal(js.Value(f), js.Value(rhs))
}
func (s shader) equal(rhs shader) bool {
return jsutil.Equal(js.Value(s), js.Value(rhs))
}
func (b buffer) equal(rhs buffer) bool {
return jsutil.Equal(js.Value(b), js.Value(rhs))
}
func (u uniformLocation) equal(rhs uniformLocation) bool {
return jsutil.Equal(js.Value(u), js.Value(rhs))
}
func (p program) equal(rhs program) bool {
return jsutil.Equal(p.value, rhs.value) && p.id == rhs.id
}
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var InvalidTexture = textureNative(js.Null())
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func getProgramID(p program) programID {
return p.id
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}
var (
// Accessing the prototype is rquired on Safari.
contextPrototype = js.Global().Get("WebGLRenderingContext").Get("prototype")
vertexShader = shaderType(contextPrototype.Get("VERTEX_SHADER").Int())
fragmentShader = shaderType(contextPrototype.Get("FRAGMENT_SHADER").Int())
arrayBuffer = bufferType(contextPrototype.Get("ARRAY_BUFFER").Int())
elementArrayBuffer = bufferType(contextPrototype.Get("ELEMENT_ARRAY_BUFFER").Int())
dynamicDraw = bufferUsage(contextPrototype.Get("DYNAMIC_DRAW").Int())
short = dataType(contextPrototype.Get("SHORT").Int())
float = dataType(contextPrototype.Get("FLOAT").Int())
zero = operation(contextPrototype.Get("ZERO").Int())
one = operation(contextPrototype.Get("ONE").Int())
srcAlpha = operation(contextPrototype.Get("SRC_ALPHA").Int())
dstAlpha = operation(contextPrototype.Get("DST_ALPHA").Int())
oneMinusSrcAlpha = operation(contextPrototype.Get("ONE_MINUS_SRC_ALPHA").Int())
oneMinusDstAlpha = operation(contextPrototype.Get("ONE_MINUS_DST_ALPHA").Int())
blend = contextPrototype.Get("BLEND")
clampToEdge = contextPrototype.Get("CLAMP_TO_EDGE")
compileStatus = contextPrototype.Get("COMPILE_STATUS")
colorAttachment0 = contextPrototype.Get("COLOR_ATTACHMENT0")
framebuffer_ = contextPrototype.Get("FRAMEBUFFER")
framebufferBinding = contextPrototype.Get("FRAMEBUFFER_BINDING")
framebufferComplete = contextPrototype.Get("FRAMEBUFFER_COMPLETE")
highFloat = contextPrototype.Get("HIGH_FLOAT")
linkStatus = contextPrototype.Get("LINK_STATUS")
maxTextureSize = contextPrototype.Get("MAX_TEXTURE_SIZE")
nearest = contextPrototype.Get("NEAREST")
noError = contextPrototype.Get("NO_ERROR")
rgba = contextPrototype.Get("RGBA")
texture2d = contextPrototype.Get("TEXTURE_2D")
textureMagFilter = contextPrototype.Get("TEXTURE_MAG_FILTER")
textureMinFilter = contextPrototype.Get("TEXTURE_MIN_FILTER")
textureWrapS = contextPrototype.Get("TEXTURE_WRAP_S")
textureWrapT = contextPrototype.Get("TEXTURE_WRAP_T")
triangles = contextPrototype.Get("TRIANGLES")
unpackAlignment = contextPrototype.Get("UNPACK_ALIGNMENT")
unsignedByte = contextPrototype.Get("UNSIGNED_BYTE")
unsignedShort = contextPrototype.Get("UNSIGNED_SHORT")
)
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type contextImpl struct {
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gl js.Value
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lastProgramID programID
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}
func (c *context) ensureGL() {
if !jsutil.Equal(c.gl, js.Value{}) {
return
}
if jsutil.Equal(js.Global().Get("WebGLRenderingContext"), js.Undefined()) {
panic("opengl: WebGL is not supported")
}
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// TODO: Define id?
canvas := js.Global().Get("document").Call("querySelector", "canvas")
attr := js.Global().Get("Object").New()
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attr.Set("alpha", true)
attr.Set("premultipliedAlpha", true)
gl := canvas.Call("getContext", "webgl", attr)
if jsutil.Equal(gl, js.Null()) {
gl = canvas.Call("getContext", "experimental-webgl", attr)
if jsutil.Equal(gl, js.Null()) {
panic("opengl: getContext failed")
}
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}
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c.gl = gl
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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())
c.lastFramebuffer = framebufferNative(js.Null())
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c.lastViewportWidth = 0
c.lastViewportHeight = 0
c.lastCompositeMode = driver.CompositeModeUnknown
c.gl = js.Value{}
c.ensureGL()
if c.gl.Call("isContextLost").Bool() {
return fmt.Errorf("opengl: the context is lost")
}
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gl := c.gl
gl.Call("enable", blend)
c.blendFunc(driver.CompositeModeSourceOver)
f := gl.Call("getParameter", framebufferBinding)
c.screenFramebuffer = framebufferNative(f)
return nil
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}
func (c *context) blendFunc(mode driver.CompositeMode) {
if c.lastCompositeMode == mode {
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return
}
c.lastCompositeMode = mode
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s, d := mode.Operations()
s2, d2 := convertOperation(s), convertOperation(d)
c.ensureGL()
gl := c.gl
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gl.Call("blendFunc", int(s2), int(d2))
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}
func (c *context) newTexture(width, height int) (textureNative, error) {
c.ensureGL()
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gl := c.gl
t := gl.Call("createTexture")
if jsutil.Equal(t, js.Null()) {
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return textureNative(js.Null()), errors.New("opengl: glGenTexture failed")
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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)
gl.Call("texParameteri", texture2d, textureMinFilter, nearest)
gl.Call("texParameteri", texture2d, textureWrapS, clampToEdge)
gl.Call("texParameteri", texture2d, textureWrapT, clampToEdge)
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// Firefox warns the usage of textures without specifying pixels (#629)
//
// Error: WebGL warning: drawElements: This operation requires zeroing texture data. This is slow.
//
// In Ebiten, textures are filled with pixels laster by the filter that ignores destination, so it is fine
// to leave textures as uninitialized here. Rather, extra memory allocating for initialization should be
// avoided.
gl.Call("texImage2D", texture2d, 0, rgba, width, height, 0, rgba, unsignedByte, nil)
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return textureNative(t), nil
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}
func (c *context) bindFramebufferImpl(f framebufferNative) {
c.ensureGL()
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gl := c.gl
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gl.Call("bindFramebuffer", framebuffer_, js.Value(f))
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}
func (c *context) framebufferPixels(f *framebuffer, width, height int) ([]byte, error) {
c.ensureGL()
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gl := c.gl
c.bindFramebuffer(f.native)
p := jsutil.TemporaryUint8Array(4 * width * height)
gl.Call("readPixels", 0, 0, width, height, rgba, unsignedByte, p)
return jsutil.Uint8ArrayToSlice(p), nil
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}
func (c *context) bindTextureImpl(t textureNative) {
c.ensureGL()
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gl := c.gl
gl.Call("bindTexture", texture2d, js.Value(t))
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}
func (c *context) deleteTexture(t textureNative) {
c.ensureGL()
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gl := c.gl
if !gl.Call("isTexture", js.Value(t)).Bool() {
return
}
if c.lastTexture.equal(t) {
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c.lastTexture = textureNative(js.Null())
}
gl.Call("deleteTexture", js.Value(t))
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}
func (c *context) isTexture(t textureNative) bool {
c.ensureGL()
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gl := c.gl
return gl.Call("isTexture", js.Value(t)).Bool()
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}
func (c *context) texSubImage2D(t textureNative, pixels []byte, x, y, width, height int) {
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c.bindTexture(t)
c.ensureGL()
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gl := c.gl
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
// GLsizei width, GLsizei height,
// GLenum format, GLenum type, ArrayBufferView? pixels);
arr := jsutil.TemporaryUint8Array(len(pixels))
jsutil.CopySliceToJS(arr, pixels)
gl.Call("texSubImage2D", texture2d, 0, x, y, width, height, rgba, unsignedByte, arr)
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}
func (c *context) newFramebuffer(t textureNative) (framebufferNative, error) {
c.ensureGL()
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gl := c.gl
f := gl.Call("createFramebuffer")
c.bindFramebuffer(framebufferNative(f))
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gl.Call("framebufferTexture2D", framebuffer_, colorAttachment0, texture2d, js.Value(t), 0)
if s := gl.Call("checkFramebufferStatus", framebuffer_); s.Int() != framebufferComplete.Int() {
return framebufferNative(js.Null()), errors.New(fmt.Sprintf("opengl: creating framebuffer failed: %d", s.Int()))
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}
return framebufferNative(f), nil
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}
func (c *context) setViewportImpl(width, height int) {
c.ensureGL()
gl := c.gl
gl.Call("viewport", 0, 0, width, height)
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}
func (c *context) deleteFramebuffer(f framebufferNative) {
c.ensureGL()
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gl := c.gl
if !gl.Call("isFramebuffer", js.Value(f)).Bool() {
return
}
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// If a framebuffer to be deleted is bound, a newly bound framebuffer
// will be a default framebuffer.
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
if c.lastFramebuffer.equal(f) {
c.lastFramebuffer = framebufferNative(js.Null())
c.lastViewportWidth = 0
c.lastViewportHeight = 0
}
gl.Call("deleteFramebuffer", js.Value(f))
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}
func (c *context) newShader(shaderType shaderType, source string) (shader, error) {
c.ensureGL()
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gl := c.gl
s := gl.Call("createShader", int(shaderType))
if jsutil.Equal(s, js.Null()) {
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return shader(js.Null()), fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
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}
gl.Call("shaderSource", js.Value(s), source)
gl.Call("compileShader", js.Value(s))
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if !gl.Call("getShaderParameter", js.Value(s), compileStatus).Bool() {
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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}
func (c *context) deleteShader(s shader) {
c.ensureGL()
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gl := c.gl
gl.Call("deleteShader", js.Value(s))
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}
func (c *context) newProgram(shaders []shader, attributes []string) (program, error) {
c.ensureGL()
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gl := c.gl
v := gl.Call("createProgram")
if jsutil.Equal(v, js.Null()) {
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return program{}, errors.New("opengl: glCreateProgram failed")
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}
for _, shader := range shaders {
gl.Call("attachShader", v, js.Value(shader))
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}
for i, name := range attributes {
gl.Call("bindAttribLocation", v, i, name)
}
gl.Call("linkProgram", v)
if !gl.Call("getProgramParameter", v, linkStatus).Bool() {
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return program{}, errors.New("opengl: program error")
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}
id := c.lastProgramID
c.lastProgramID++
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return program{
value: v,
id: id,
}, nil
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}
func (c *context) useProgram(p program) {
c.ensureGL()
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gl := c.gl
gl.Call("useProgram", p.value)
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}
func (c *context) deleteProgram(p program) {
c.ensureGL()
gl := c.gl
if !gl.Call("isProgram", p.value).Bool() {
return
}
gl.Call("deleteProgram", p.value)
}
func (c *context) getUniformLocationImpl(p program, location string) uniformLocation {
c.ensureGL()
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gl := c.gl
return uniformLocation(gl.Call("getUniformLocation", p.value, location))
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}
func (c *context) uniformInt(p program, location string, v int) {
c.ensureGL()
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gl := c.gl
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l := c.locationCache.GetUniformLocation(c, p, location)
gl.Call("uniform1i", js.Value(l), v)
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}
func (c *context) uniformFloat(p program, location string, v float32) {
c.ensureGL()
gl := c.gl
l := c.locationCache.GetUniformLocation(c, p, location)
gl.Call("uniform1f", js.Value(l), v)
}
func (c *context) uniformFloats(p program, location string, v []float32) {
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) {
case 2:
gl.Call("uniform2f", js.Value(l), v[0], v[1])
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case 4:
gl.Call("uniform4f", js.Value(l), v[0], v[1], v[2], v[3])
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case 16:
arr8 := jsutil.TemporaryUint8Array(len(v) * 4)
arr := js.Global().Get("Float32Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(v))
jsutil.CopySliceToJS(arr, v)
gl.Call("uniformMatrix4fv", js.Value(l), false, arr)
default:
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panic(fmt.Sprintf("opengl: invalid uniform floats num: %d", len(v)))
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}
}
func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
c.ensureGL()
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gl := c.gl
gl.Call("vertexAttribPointer", index, size, int(dataType), false, stride, offset)
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}
func (c *context) enableVertexAttribArray(p program, index int) {
c.ensureGL()
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gl := c.gl
gl.Call("enableVertexAttribArray", index)
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}
func (c *context) disableVertexAttribArray(p program, index int) {
c.ensureGL()
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gl := c.gl
gl.Call("disableVertexAttribArray", index)
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}
func (c *context) newArrayBuffer(size int) buffer {
c.ensureGL()
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gl := c.gl
b := gl.Call("createBuffer")
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gl.Call("bindBuffer", int(arrayBuffer), js.Value(b))
gl.Call("bufferData", int(arrayBuffer), size, int(dynamicDraw))
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return buffer(b)
}
func (c *context) newElementArrayBuffer(size int) buffer {
c.ensureGL()
gl := c.gl
b := gl.Call("createBuffer")
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gl.Call("bindBuffer", int(elementArrayBuffer), js.Value(b))
gl.Call("bufferData", int(elementArrayBuffer), size, int(dynamicDraw))
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return buffer(b)
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}
func (c *context) bindBuffer(bufferType bufferType, b buffer) {
c.ensureGL()
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gl := c.gl
gl.Call("bindBuffer", int(bufferType), js.Value(b))
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}
func (c *context) arrayBufferSubData(data []float32) {
c.ensureGL()
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gl := c.gl
arr8 := jsutil.TemporaryUint8Array(len(data) * 4)
arr := js.Global().Get("Float32Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(data))
jsutil.CopySliceToJS(arr, data)
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gl.Call("bufferSubData", int(arrayBuffer), 0, arr)
}
func (c *context) elementArrayBufferSubData(data []uint16) {
c.ensureGL()
gl := c.gl
arr8 := jsutil.TemporaryUint8Array(len(data) * 2)
arr := js.Global().Get("Uint16Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(data))
jsutil.CopySliceToJS(arr, data)
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gl.Call("bufferSubData", int(elementArrayBuffer), 0, arr)
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}
func (c *context) deleteBuffer(b buffer) {
c.ensureGL()
gl := c.gl
gl.Call("deleteBuffer", js.Value(b))
}
func (c *context) drawElements(len int, offsetInBytes int) {
c.ensureGL()
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gl := c.gl
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gl.Call("drawElements", triangles, len, unsignedShort, offsetInBytes)
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}
func (c *context) maxTextureSizeImpl() int {
c.ensureGL()
gl := c.gl
return gl.Call("getParameter", maxTextureSize).Int()
}
func (c *context) getShaderPrecisionFormatPrecision() int {
c.ensureGL()
gl := c.gl
return gl.Call("getShaderPrecisionFormat", js.ValueOf(int(fragmentShader)), highFloat).Get("precision").Int()
}
func (c *context) flush() {
c.ensureGL()
gl := c.gl
gl.Call("flush")
}
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func (c *context) needsRestoring() bool {
return !web.IsMobileBrowser()
}