mirror of
https://github.com/hajimehoshi/ebiten.git
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f08983e14d
It should be safe to assume 0 is an invalid texture ID in OpenGL. https://registry.khronos.org/OpenGL-Refpages/gl4/html/glIsTexture.xhtml > If texture is zero, or is a non-zero value that is not currently the > name of a texture, or if an error occurs, glIsTexture returns GL_FALSE.
608 lines
18 KiB
Go
608 lines
18 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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"os"
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"strings"
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"syscall/js"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
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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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)
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type (
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textureNative js.Value
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renderbufferNative 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 js.Value(t).Equal(js.Value(rhs))
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}
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func (r renderbufferNative) equal(rhs renderbufferNative) bool {
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return js.Value(r).Equal(js.Value(rhs))
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}
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func (f framebufferNative) equal(rhs framebufferNative) bool {
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return js.Value(f).Equal(js.Value(rhs))
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}
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func (s shader) equal(rhs shader) bool {
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return js.Value(s).Equal(js.Value(rhs))
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}
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func (b buffer) equal(rhs buffer) bool {
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return js.Value(b).Equal(js.Value(rhs))
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}
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func (u uniformLocation) equal(rhs uniformLocation) bool {
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return js.Value(u).Equal(js.Value(rhs))
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}
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func (p program) equal(rhs program) bool {
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return p.value.Equal(rhs.value) && p.id == rhs.id
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}
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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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type webGLVersion int
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const (
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webGLVersionUnknown webGLVersion = iota
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webGLVersion1
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webGLVersion2
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)
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func webGL2MightBeAvailable() bool {
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env := os.Getenv("EBITENGINE_OPENGL")
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for _, t := range strings.Split(env, ",") {
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switch strings.TrimSpace(t) {
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case "webgl1":
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return false
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}
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}
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return js.Global().Get("WebGL2RenderingContext").Truthy()
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}
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type contextImpl struct {
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gl *jsGL
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canvas js.Value
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lastProgramID programID
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webGLVersion webGLVersion
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}
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func (c *context) usesWebGL2() bool {
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return c.webGLVersion == webGLVersion2
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}
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func (c *context) initGL() error {
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c.webGLVersion = webGLVersionUnknown
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var gl js.Value
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if doc := js.Global().Get("document"); doc.Truthy() {
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canvas := c.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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attr.Set("stencil", true)
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if webGL2MightBeAvailable() {
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gl = canvas.Call("getContext", "webgl2", attr)
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if gl.Truthy() {
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c.webGLVersion = webGLVersion2
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}
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}
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// Even though WebGL2RenderingContext exists, getting a webgl2 context might fail (#1738).
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if !gl.Truthy() {
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gl = canvas.Call("getContext", "webgl", attr)
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if !gl.Truthy() {
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gl = canvas.Call("getContext", "experimental-webgl", attr)
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}
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if gl.Truthy() {
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c.webGLVersion = webGLVersion1
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}
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}
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if !gl.Truthy() {
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return fmt.Errorf("opengl: getContext failed")
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}
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}
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c.gl = c.newJSGL(gl)
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return nil
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}
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func (c *context) reset() error {
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c.locationCache = newLocationCache()
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c.lastTexture = 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.lastBlend = graphicsdriver.Blend{}
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if err := c.initGL(); err != nil {
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return err
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}
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if c.gl.isContextLost.Invoke().Bool() {
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return graphicsdriver.GraphicsNotReady
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}
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c.gl.enable.Invoke(gl.BLEND)
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c.gl.enable.Invoke(gl.SCISSOR_TEST)
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c.blend(graphicsdriver.BlendSourceOver)
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f := c.gl.getParameter.Invoke(gl.FRAMEBUFFER_BINDING)
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c.screenFramebuffer = framebufferNative(f)
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if !c.usesWebGL2() {
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c.gl.getExtension.Invoke("OES_standard_derivatives")
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}
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return nil
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}
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func (c *context) blend(blend graphicsdriver.Blend) {
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if c.lastBlend == blend {
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return
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}
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c.lastBlend = blend
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c.gl.blendFuncSeparate.Invoke(
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int(convertBlendFactor(blend.BlendFactorSourceRGB)),
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int(convertBlendFactor(blend.BlendFactorDestinationRGB)),
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int(convertBlendFactor(blend.BlendFactorSourceAlpha)),
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int(convertBlendFactor(blend.BlendFactorDestinationAlpha)),
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)
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c.gl.blendEquationSeparate.Invoke(
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int(convertBlendOperation(blend.BlendOperationRGB)),
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int(convertBlendOperation(blend.BlendOperationAlpha)),
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)
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}
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func (c *context) scissor(x, y, width, height int) {
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c.gl.scissor.Invoke(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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t := c.gl.createTexture.Invoke()
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if !t.Truthy() {
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return textureNative(js.Null()), errors.New("opengl: createTexture failed")
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}
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c.bindTexture(textureNative(t))
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c.gl.texParameteri.Invoke(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
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c.gl.texParameteri.Invoke(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
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c.gl.texParameteri.Invoke(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
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c.gl.texParameteri.Invoke(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
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c.gl.pixelStorei.Invoke(gl.UNPACK_ALIGNMENT, 4)
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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 Ebitengine, 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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c.gl.texImage2D.Invoke(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.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.gl.bindFramebuffer.Invoke(gl.FRAMEBUFFER, js.Value(f))
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}
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func (c *context) framebufferPixels(buf []byte, f *framebuffer, x, y, width, height int) {
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c.bindFramebuffer(f.native)
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if got, want := len(buf), 4*width*height; got != want {
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panic(fmt.Sprintf("opengl: len(buf) must be %d but %d", got, want))
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}
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p := jsutil.TemporaryUint8ArrayFromUint8Slice(len(buf), nil)
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c.gl.readPixels.Invoke(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, p)
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js.CopyBytesToGo(buf, 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.bindFramebuffer(f.native)
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c.gl.bindBuffer.Invoke(gl.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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c.gl.readPixels.Invoke(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0)
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c.gl.bindBuffer.Invoke(gl.PIXEL_PACK_BUFFER, nil)
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}
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func (c *context) activeTexture(idx int) {
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c.gl.activeTexture.Invoke(gl.TEXTURE0 + idx)
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}
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func (c *context) bindTextureImpl(t textureNative) {
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c.gl.bindTexture.Invoke(gl.TEXTURE_2D, js.Value(t))
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}
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func (c *context) deleteTexture(t textureNative) {
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if !c.gl.isTexture.Invoke(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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c.gl.deleteTexture.Invoke(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) newRenderbuffer(width, height int) (renderbufferNative, error) {
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r := c.gl.createRenderbuffer.Invoke()
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if !r.Truthy() {
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return renderbufferNative(js.Null()), errors.New("opengl: createRenderbuffer failed")
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}
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c.bindRenderbuffer(renderbufferNative(r))
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// TODO: Is STENCIL_INDEX8 portable?
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// https://stackoverflow.com/questions/11084961/binding-a-stencil-render-buffer-to-a-frame-buffer-in-opengl
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c.gl.renderbufferStorage.Invoke(gl.RENDERBUFFER, gl.STENCIL_INDEX8, width, height)
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return renderbufferNative(r), nil
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}
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func (c *context) bindRenderbufferImpl(r renderbufferNative) {
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c.gl.bindRenderbuffer.Invoke(gl.RENDERBUFFER, js.Value(r))
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}
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func (c *context) deleteRenderbuffer(r renderbufferNative) {
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if !c.gl.isRenderbuffer.Invoke(js.Value(r)).Bool() {
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return
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}
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if c.lastRenderbuffer.equal(r) {
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c.lastRenderbuffer = renderbufferNative(js.Null())
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}
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c.gl.deleteRenderbuffer.Invoke(js.Value(r))
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}
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func (c *context) newFramebuffer(t textureNative) (framebufferNative, error) {
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f := c.gl.createFramebuffer.Invoke()
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c.bindFramebuffer(framebufferNative(f))
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c.gl.framebufferTexture2D.Invoke(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, js.Value(t), 0)
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if s := c.gl.checkFramebufferStatus.Invoke(gl.FRAMEBUFFER); s.Int() != gl.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) bindStencilBuffer(f framebufferNative, r renderbufferNative) error {
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c.bindFramebuffer(f)
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c.gl.framebufferRenderbuffer.Invoke(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, js.Value(r))
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if s := c.gl.checkFramebufferStatus.Invoke(gl.FRAMEBUFFER); s.Int() != gl.FRAMEBUFFER_COMPLETE {
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return errors.New(fmt.Sprintf("opengl: framebufferRenderbuffer failed: %d", s.Int()))
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}
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return nil
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}
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func (c *context) setViewportImpl(width, height int) {
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c.gl.viewport.Invoke(0, 0, width, height)
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}
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func (c *context) deleteFramebuffer(f framebufferNative) {
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if !c.gl.isFramebuffer.Invoke(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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c.gl.deleteFramebuffer.Invoke(js.Value(f))
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}
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func (c *context) newVertexShader(source string) (shader, error) {
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return c.newShader(gl.VERTEX_SHADER, source)
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}
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func (c *context) newFragmentShader(source string) (shader, error) {
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return c.newShader(gl.FRAGMENT_SHADER, source)
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}
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func (c *context) newShader(shaderType int, source string) (shader, error) {
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s := c.gl.createShader.Invoke(int(shaderType))
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if !s.Truthy() {
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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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c.gl.shaderSource.Invoke(js.Value(s), source)
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c.gl.compileShader.Invoke(js.Value(s))
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if !c.gl.getShaderParameter.Invoke(js.Value(s), gl.COMPILE_STATUS).Bool() {
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log := c.gl.getShaderInfoLog.Invoke(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.gl.deleteShader.Invoke(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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v := c.gl.createProgram.Invoke()
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if !v.Truthy() {
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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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c.gl.attachShader.Invoke(v, js.Value(shader))
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}
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for i, name := range attributes {
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c.gl.bindAttribLocation.Invoke(v, i, name)
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}
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c.gl.linkProgram.Invoke(v)
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if !c.gl.getProgramParameter.Invoke(v, gl.LINK_STATUS).Bool() {
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info := c.gl.getProgramInfoLog.Invoke(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.gl.useProgram.Invoke(p.value)
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}
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func (c *context) deleteProgram(p program) {
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c.locationCache.deleteProgram(p)
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if !c.gl.isProgram.Invoke(p.value).Bool() {
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return
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}
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c.gl.deleteProgram.Invoke(p.value)
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}
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func (c *context) getUniformLocationImpl(p program, location string) uniformLocation {
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return uniformLocation(c.gl.getUniformLocation.Invoke(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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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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c.gl.uniform1i.Invoke(js.Value(l), v)
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return true
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}
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func (c *context) uniforms(p program, location string, v []uint32, typ shaderir.Type) bool {
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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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switch base {
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case shaderir.Float:
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arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
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if c.usesWebGL2() {
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c.gl.uniform1fv.Invoke(js.Value(l), arr, 0, len(v))
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} else {
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c.gl.uniform1fv.Invoke(js.Value(l), arr.Call("subarray", 0, len(v)))
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}
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case shaderir.Int:
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arr := jsutil.TemporaryInt32Array(len(v), uint32sToInt32s(v))
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if c.usesWebGL2() {
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c.gl.uniform1iv.Invoke(js.Value(l), arr, 0, len(v))
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} else {
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c.gl.uniform1iv.Invoke(js.Value(l), arr.Call("subarray", 0, len(v)))
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}
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case shaderir.Vec2:
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arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
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if c.usesWebGL2() {
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c.gl.uniform2fv.Invoke(js.Value(l), arr, 0, len(v))
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} else {
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c.gl.uniform2fv.Invoke(js.Value(l), arr.Call("subarray", 0, len(v)))
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}
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case shaderir.Vec3:
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arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
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if c.usesWebGL2() {
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c.gl.uniform3fv.Invoke(js.Value(l), arr, 0, len(v))
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} else {
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c.gl.uniform3fv.Invoke(js.Value(l), arr.Call("subarray", 0, len(v)))
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}
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case shaderir.Vec4:
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arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
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if c.usesWebGL2() {
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c.gl.uniform4fv.Invoke(js.Value(l), arr, 0, len(v))
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} else {
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c.gl.uniform4fv.Invoke(js.Value(l), arr.Call("subarray", 0, len(v)))
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}
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case shaderir.Mat2:
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arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
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if c.usesWebGL2() {
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c.gl.uniformMatrix2fv.Invoke(js.Value(l), false, arr, 0, len(v))
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} else {
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c.gl.uniformMatrix2fv.Invoke(js.Value(l), false, arr.Call("subarray", 0, len(v)))
|
|
}
|
|
case shaderir.Mat3:
|
|
arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
|
|
if c.usesWebGL2() {
|
|
c.gl.uniformMatrix3fv.Invoke(js.Value(l), false, arr, 0, len(v))
|
|
} else {
|
|
c.gl.uniformMatrix3fv.Invoke(js.Value(l), false, arr.Call("subarray", 0, len(v)))
|
|
}
|
|
case shaderir.Mat4:
|
|
arr := jsutil.TemporaryFloat32Array(len(v), uint32sToFloat32s(v))
|
|
if c.usesWebGL2() {
|
|
c.gl.uniformMatrix4fv.Invoke(js.Value(l), false, arr, 0, len(v))
|
|
} else {
|
|
c.gl.uniformMatrix4fv.Invoke(js.Value(l), false, arr.Call("subarray", 0, len(v)))
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("opengl: unexpected type: %s", typ.String()))
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (c *context) vertexAttribPointer(index int, size int, stride int, offset int) {
|
|
c.gl.vertexAttribPointer.Invoke(index, size, gl.FLOAT, false, stride, offset)
|
|
}
|
|
|
|
func (c *context) enableVertexAttribArray(index int) {
|
|
c.gl.enableVertexAttribArray.Invoke(index)
|
|
}
|
|
|
|
func (c *context) disableVertexAttribArray(index int) {
|
|
c.gl.disableVertexAttribArray.Invoke(index)
|
|
}
|
|
|
|
func (c *context) newArrayBuffer(size int) buffer {
|
|
b := c.gl.createBuffer.Invoke()
|
|
c.gl.bindBuffer.Invoke(gl.ARRAY_BUFFER, js.Value(b))
|
|
c.gl.bufferData.Invoke(gl.ARRAY_BUFFER, size, gl.DYNAMIC_DRAW)
|
|
return buffer(b)
|
|
}
|
|
|
|
func (c *context) newElementArrayBuffer(size int) buffer {
|
|
b := c.gl.createBuffer.Invoke()
|
|
c.gl.bindBuffer.Invoke(gl.ELEMENT_ARRAY_BUFFER, js.Value(b))
|
|
c.gl.bufferData.Invoke(gl.ELEMENT_ARRAY_BUFFER, size, gl.DYNAMIC_DRAW)
|
|
return buffer(b)
|
|
}
|
|
|
|
func (c *context) bindArrayBuffer(b buffer) {
|
|
c.gl.bindBuffer.Invoke(gl.ARRAY_BUFFER, js.Value(b))
|
|
}
|
|
|
|
func (c *context) bindElementArrayBuffer(b buffer) {
|
|
c.gl.bindBuffer.Invoke(gl.ELEMENT_ARRAY_BUFFER, js.Value(b))
|
|
}
|
|
|
|
func (c *context) arrayBufferSubData(data []float32) {
|
|
l := len(data) * 4
|
|
arr := jsutil.TemporaryUint8ArrayFromFloat32Slice(l, data)
|
|
if c.usesWebGL2() {
|
|
c.gl.bufferSubData.Invoke(gl.ARRAY_BUFFER, 0, arr, 0, l)
|
|
} else {
|
|
c.gl.bufferSubData.Invoke(gl.ARRAY_BUFFER, 0, arr.Call("subarray", 0, l))
|
|
}
|
|
}
|
|
|
|
func (c *context) elementArrayBufferSubData(data []uint16) {
|
|
l := len(data) * 2
|
|
arr := jsutil.TemporaryUint8ArrayFromUint16Slice(l, data)
|
|
if c.usesWebGL2() {
|
|
c.gl.bufferSubData.Invoke(gl.ELEMENT_ARRAY_BUFFER, 0, arr, 0, l)
|
|
} else {
|
|
c.gl.bufferSubData.Invoke(gl.ELEMENT_ARRAY_BUFFER, 0, arr.Call("subarray", 0, l))
|
|
}
|
|
}
|
|
|
|
func (c *context) deleteBuffer(b buffer) {
|
|
c.gl.deleteBuffer.Invoke(js.Value(b))
|
|
}
|
|
|
|
func (c *context) drawElements(len int, offsetInBytes int) {
|
|
c.gl.drawElements.Invoke(gl.TRIANGLES, len, gl.UNSIGNED_SHORT, offsetInBytes)
|
|
}
|
|
|
|
func (c *context) maxTextureSizeImpl() int {
|
|
return c.gl.getParameter.Invoke(gl.MAX_TEXTURE_SIZE).Int()
|
|
}
|
|
|
|
func (c *context) flush() {
|
|
c.gl.flush.Invoke()
|
|
}
|
|
|
|
func (c *context) texSubImage2D(t textureNative, args []*graphicsdriver.WritePixelsArgs) {
|
|
c.bindTexture(t)
|
|
for _, a := range args {
|
|
arr := jsutil.TemporaryUint8ArrayFromUint8Slice(len(a.Pixels), a.Pixels)
|
|
if c.usesWebGL2() {
|
|
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
|
|
// GLsizei width, GLsizei height,
|
|
// GLenum format, GLenum type, ArrayBufferView pixels, srcOffset);
|
|
c.gl.texSubImage2D.Invoke(gl.TEXTURE_2D, 0, a.X, a.Y, a.Width, a.Height, gl.RGBA, gl.UNSIGNED_BYTE, arr, 0)
|
|
} else {
|
|
// void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
|
|
// GLsizei width, GLsizei height,
|
|
// GLenum format, GLenum type, ArrayBufferView? pixels);
|
|
c.gl.texSubImage2D.Invoke(gl.TEXTURE_2D, 0, a.X, a.Y, a.Width, a.Height, gl.RGBA, gl.UNSIGNED_BYTE, arr)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *context) enableStencilTest() {
|
|
c.gl.enable.Invoke(gl.STENCIL_TEST)
|
|
}
|
|
|
|
func (c *context) disableStencilTest() {
|
|
c.gl.disable.Invoke(gl.STENCIL_TEST)
|
|
}
|
|
|
|
func (c *context) beginStencilWithEvenOddRule() {
|
|
c.gl.clear.Invoke(gl.STENCIL_BUFFER_BIT)
|
|
c.gl.stencilFunc.Invoke(gl.ALWAYS, 0x00, 0xff)
|
|
c.gl.stencilOp.Invoke(gl.KEEP, gl.KEEP, gl.INVERT)
|
|
c.gl.colorMask.Invoke(false, false, false, false)
|
|
}
|
|
|
|
func (c *context) endStencilWithEvenOddRule() {
|
|
c.gl.stencilFunc.Invoke(gl.NOTEQUAL, 0x00, 0xff)
|
|
c.gl.stencilOp.Invoke(gl.KEEP, gl.KEEP, gl.KEEP)
|
|
c.gl.colorMask.Invoke(true, true, true, true)
|
|
}
|
|
|
|
func (c *context) isES() bool {
|
|
// WebGL is compatible with GLES.
|
|
return true
|
|
}
|