mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
b1d7a5f595
With WebGL1, an extension is required for dFdx. On the other hand, with WebGL2, GLSL ES 300 is required and the extension is forbidden. This change fixes shaderir/glsl to switch the output depends on the WebGL version. This change also adds a new build tag 'ebitenwebgl1' forcing WebGL 1. Updates #1404
586 lines
17 KiB
Go
586 lines
17 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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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/v2/internal/driver"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gles"
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"github.com/hajimehoshi/ebiten/v2/internal/jsutil"
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"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
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"github.com/hajimehoshi/ebiten/v2/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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func (t textureNative) equal(rhs textureNative) bool {
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return jsutil.Equal(js.Value(t), js.Value(rhs))
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}
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func (f framebufferNative) equal(rhs framebufferNative) bool {
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return jsutil.Equal(js.Value(f), js.Value(rhs))
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}
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func (s shader) equal(rhs shader) bool {
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return jsutil.Equal(js.Value(s), js.Value(rhs))
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}
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func (b buffer) equal(rhs buffer) bool {
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return jsutil.Equal(js.Value(b), js.Value(rhs))
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}
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func (u uniformLocation) equal(rhs uniformLocation) bool {
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return jsutil.Equal(js.Value(u), js.Value(rhs))
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}
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func (p program) equal(rhs program) bool {
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return jsutil.Equal(p.value, rhs.value) && p.id == rhs.id
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}
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var InvalidTexture = textureNative(js.Null())
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var invalidUniform = uniformLocation(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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const (
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vertexShader = shaderType(gles.VERTEX_SHADER)
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fragmentShader = shaderType(gles.FRAGMENT_SHADER)
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arrayBuffer = bufferType(gles.ARRAY_BUFFER)
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elementArrayBuffer = bufferType(gles.ELEMENT_ARRAY_BUFFER)
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dynamicDraw = bufferUsage(gles.DYNAMIC_DRAW)
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streamDraw = bufferUsage(gles.STREAM_DRAW)
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pixelUnpackBuffer = bufferType(gles.PIXEL_UNPACK_BUFFER)
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short = dataType(gles.SHORT)
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float = dataType(gles.FLOAT)
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zero = operation(gles.ZERO)
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one = operation(gles.ONE)
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srcAlpha = operation(gles.SRC_ALPHA)
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dstAlpha = operation(gles.DST_ALPHA)
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oneMinusSrcAlpha = operation(gles.ONE_MINUS_SRC_ALPHA)
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oneMinusDstAlpha = operation(gles.ONE_MINUS_DST_ALPHA)
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dstColor = operation(gles.DST_COLOR)
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)
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var (
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isWebGL2Available = !forceWebGL1 && js.Global().Get("WebGL2RenderingContext").Truthy()
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)
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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 !jsutil.Equal(c.gl, js.Value{}) {
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return
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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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var gl js.Value
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if isWebGL2Available {
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gl = canvas.Call("getContext", "webgl2", attr)
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} else {
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gl = canvas.Call("getContext", "webgl", attr)
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if jsutil.Equal(gl, js.Null()) {
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gl = canvas.Call("getContext", "experimental-webgl", attr)
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if jsutil.Equal(gl, js.Null()) {
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panic("opengl: getContext failed")
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}
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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 driver.GraphicsNotReady
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}
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gl := c.gl
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gl.Call("enable", gles.BLEND)
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gl.Call("enable", gles.SCISSOR_TEST)
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c.blendFunc(driver.CompositeModeSourceOver)
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f := gl.Call("getParameter", gles.FRAMEBUFFER_BINDING)
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c.screenFramebuffer = framebufferNative(f)
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if !isWebGL2Available {
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gl.Call("getExtension", "OES_standard_derivatives")
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}
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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) scissor(x, y, width, height int) {
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gl := c.gl
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gl.Call("scissor", x, y, width, height)
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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 jsutil.Equal(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", gles.UNPACK_ALIGNMENT, 4)
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c.bindTexture(textureNative(t))
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gl.Call("texParameteri", gles.TEXTURE_2D, gles.TEXTURE_MAG_FILTER, gles.NEAREST)
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gl.Call("texParameteri", gles.TEXTURE_2D, gles.TEXTURE_MIN_FILTER, gles.NEAREST)
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gl.Call("texParameteri", gles.TEXTURE_2D, gles.TEXTURE_WRAP_S, gles.CLAMP_TO_EDGE)
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gl.Call("texParameteri", gles.TEXTURE_2D, gles.TEXTURE_WRAP_T, gles.CLAMP_TO_EDGE)
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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", gles.TEXTURE_2D, 0, gles.RGBA, width, height, 0, gles.RGBA, gles.UNSIGNED_BYTE, 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", gles.FRAMEBUFFER, js.Value(f))
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}
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func (c *context) framebufferPixels(f *framebuffer, width, height int) []byte {
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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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p := jsutil.TemporaryUint8Array(4 * width * height)
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gl.Call("readPixels", 0, 0, width, height, gles.RGBA, gles.UNSIGNED_BYTE, p)
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return jsutil.Uint8ArrayToSlice(p)
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}
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func (c *context) framebufferPixelsToBuffer(f *framebuffer, buffer buffer, width, height int) {
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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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gl.Call("bindBuffer", gles.PIXEL_PACK_BUFFER, js.Value(buffer))
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// void gl.readPixels(x, y, width, height, format, type, GLintptr offset);
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gl.Call("readPixels", 0, 0, width, height, gles.RGBA, gles.UNSIGNED_BYTE, 0)
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gl.Call("bindBuffer", gles.PIXEL_PACK_BUFFER, nil)
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}
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func (c *context) activeTexture(idx int) {
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c.ensureGL()
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gl := c.gl
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gl.Call("activeTexture", gles.TEXTURE0+idx)
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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", gles.TEXTURE_2D, 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.equal(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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// isTexture should not be called to detect context-lost since this performance is not good (#1175).
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panic("opengl: isTexture is not implemented")
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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", gles.FRAMEBUFFER, gles.COLOR_ATTACHMENT0, gles.TEXTURE_2D, js.Value(t), 0)
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if s := gl.Call("checkFramebufferStatus", gles.FRAMEBUFFER); s.Int() != gles.FRAMEBUFFER_COMPLETE {
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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.equal(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 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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}
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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), gles.COMPILE_STATUS).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 jsutil.Equal(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, gles.LINK_STATUS).Bool() {
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info := gl.Call("getProgramInfoLog", v).String()
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return program{}, fmt.Errorf("opengl: program error: %s", info)
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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) bool {
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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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if l.equal(invalidUniform) {
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return false
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}
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gl.Call("uniform1i", js.Value(l), v)
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return true
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}
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func (c *context) uniformFloat(p program, location string, v float32) bool {
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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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if l.equal(invalidUniform) {
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return false
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}
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gl.Call("uniform1f", js.Value(l), v)
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return true
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}
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func (c *context) uniformFloats(p program, location string, v []float32, typ shaderir.Type) bool {
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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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if l.equal(invalidUniform) {
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return false
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}
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base := typ.Main
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if base == shaderir.Array {
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base = typ.Sub[0].Main
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}
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arr8 := jsutil.TemporaryUint8Array(len(v) * 4)
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arr := js.Global().Get("Float32Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(v))
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jsutil.CopySliceToJS(arr, v)
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switch base {
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case shaderir.Float:
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gl.Call("uniform1fv", js.Value(l), arr)
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case shaderir.Vec2:
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gl.Call("uniform2fv", js.Value(l), arr)
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case shaderir.Vec3:
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gl.Call("uniform3fv", js.Value(l), arr)
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case shaderir.Vec4:
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gl.Call("uniform4fv", js.Value(l), arr)
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case shaderir.Mat2:
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gl.Call("uniformMatrix2fv", js.Value(l), false, arr)
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case shaderir.Mat3:
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gl.Call("uniformMatrix3fv", js.Value(l), false, arr)
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case shaderir.Mat4:
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gl.Call("uniformMatrix4fv", js.Value(l), false, arr)
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default:
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panic(fmt.Sprintf("opengl: unexpected type: %s", typ.String()))
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}
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return true
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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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arr8 := jsutil.TemporaryUint8Array(len(data) * 4)
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arr := js.Global().Get("Float32Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(data))
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jsutil.CopySliceToJS(arr, data)
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gl.Call("bufferSubData", int(arrayBuffer), 0, arr)
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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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arr8 := jsutil.TemporaryUint8Array(len(data) * 2)
|
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arr := js.Global().Get("Uint16Array").New(arr8.Get("buffer"), arr8.Get("byteOffset"), len(data))
|
|
jsutil.CopySliceToJS(arr, data)
|
|
gl.Call("bufferSubData", int(elementArrayBuffer), 0, arr)
|
|
}
|
|
|
|
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()
|
|
gl := c.gl
|
|
gl.Call("drawElements", gles.TRIANGLES, len, gles.UNSIGNED_SHORT, offsetInBytes)
|
|
}
|
|
|
|
func (c *context) maxTextureSizeImpl() int {
|
|
c.ensureGL()
|
|
gl := c.gl
|
|
return gl.Call("getParameter", gles.MAX_TEXTURE_SIZE).Int()
|
|
}
|
|
|
|
func (c *context) getShaderPrecisionFormatPrecision() int {
|
|
c.ensureGL()
|
|
gl := c.gl
|
|
return gl.Call("getShaderPrecisionFormat", js.ValueOf(int(fragmentShader)), gles.HIGH_FLOAT).Get("precision").Int()
|
|
}
|
|
|
|
func (c *context) flush() {
|
|
c.ensureGL()
|
|
gl := c.gl
|
|
gl.Call("flush")
|
|
}
|
|
|
|
func (c *context) needsRestoring() bool {
|
|
return !web.IsMobileBrowser()
|
|
}
|
|
|
|
func (c *context) canUsePBO() bool {
|
|
return isWebGL2Available
|
|
}
|
|
|
|
func (c *context) texSubImage2D(t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
|
|
c.ensureGL()
|
|
c.bindTexture(t)
|
|
gl := c.gl
|
|
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
|
|
// GLsizei width, GLsizei height,
|
|
// GLenum format, GLenum type, ArrayBufferView? pixels);
|
|
for _, a := range args {
|
|
arr := jsutil.TemporaryUint8Array(len(a.Pixels))
|
|
jsutil.CopySliceToJS(arr, a.Pixels)
|
|
gl.Call("texSubImage2D", gles.TEXTURE_2D, 0, a.X, a.Y, a.Width, a.Height, gles.RGBA, gles.UNSIGNED_BYTE, arr)
|
|
}
|
|
}
|
|
|
|
func (c *context) newPixelBufferObject(width, height int) buffer {
|
|
c.ensureGL()
|
|
gl := c.gl
|
|
b := gl.Call("createBuffer")
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), js.Value(b))
|
|
gl.Call("bufferData", int(pixelUnpackBuffer), 4*width*height, int(streamDraw))
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), nil)
|
|
return buffer(b)
|
|
}
|
|
|
|
func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
|
|
c.ensureGL()
|
|
c.bindTexture(t)
|
|
gl := c.gl
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), js.Value(buffer))
|
|
|
|
stride := 4 * width
|
|
for _, a := range args {
|
|
arr := jsutil.TemporaryUint8Array(len(a.Pixels))
|
|
jsutil.CopySliceToJS(arr, a.Pixels)
|
|
offset := 4 * (a.Y*width + a.X)
|
|
for j := 0; j < a.Height; j++ {
|
|
gl.Call("bufferSubData", int(pixelUnpackBuffer), offset+stride*j, arr, 4*a.Width*j, 4*a.Width)
|
|
}
|
|
}
|
|
|
|
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
|
|
// GLsizei width, GLsizei height,
|
|
// GLenum format, GLenum type, GLintptr offset);
|
|
gl.Call("texSubImage2D", gles.TEXTURE_2D, 0, 0, 0, width, height, gles.RGBA, gles.UNSIGNED_BYTE, 0)
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), nil)
|
|
}
|
|
|
|
func (c *context) getBufferSubData(buffer buffer, width, height int) []byte {
|
|
gl := c.gl
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), buffer)
|
|
arr := jsutil.TemporaryUint8Array(4 * width * height)
|
|
gl.Call("getBufferSubData", int(pixelUnpackBuffer), 0, arr)
|
|
gl.Call("bindBuffer", int(pixelUnpackBuffer), 0)
|
|
return jsutil.Uint8ArrayToSlice(arr)
|
|
}
|