mirror of
https://git.sr.ht/~eliasnaur/gio
synced 2026-07-01 15:45:38 +00:00
Elias Naur
b1ff179aa0
Modern graphics APIs have immutable objects, with mutable data. For example, a texture's dimensions are immutable, while the texture contents is not. Change the GPU API abstraction to match. Clearing a Texture is convenient to do with a plain []byte. Generalize Texture.Upload to take a plain byte slice and introduce a helper function for uploading *image.RGBA data. Add TextureFormatRGBA8, a format for the linear RGB colorspace. Add OpenGL ES 3.1 functions for compute programs. Signed-off-by: Elias Naur <mail@eliasnaur.com>
382 lines
13 KiB
Go
382 lines
13 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package glimpl
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import (
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"errors"
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"strings"
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"syscall/js"
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)
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type Functions struct {
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Ctx js.Value
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EXT_disjoint_timer_query js.Value
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EXT_disjoint_timer_query_webgl2 js.Value
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// Cached reference to the Uint8Array JS type.
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uint8Array js.Value
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// Cached JS arrays.
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arrayBuf js.Value
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int32Buf js.Value
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}
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type Context js.Value
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func NewFunctions(ctx Context) (*Functions, error) {
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f := &Functions{
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Ctx: js.Value(ctx),
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uint8Array: js.Global().Get("Uint8Array"),
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}
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if err := f.Init(); err != nil {
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return nil, err
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}
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return f, nil
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}
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func (f *Functions) Init() error {
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webgl2Class := js.Global().Get("WebGL2RenderingContext")
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iswebgl2 := !webgl2Class.IsUndefined() && f.Ctx.InstanceOf(webgl2Class)
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if !iswebgl2 {
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f.EXT_disjoint_timer_query = f.getExtension("EXT_disjoint_timer_query")
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if f.getExtension("OES_texture_half_float").IsNull() && f.getExtension("OES_texture_float").IsNull() {
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return errors.New("gl: no support for neither OES_texture_half_float nor OES_texture_float")
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}
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if f.getExtension("EXT_sRGB").IsNull() {
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return errors.New("gl: EXT_sRGB not supported")
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}
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} else {
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// WebGL2 extensions.
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f.EXT_disjoint_timer_query_webgl2 = f.getExtension("EXT_disjoint_timer_query_webgl2")
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if f.getExtension("EXT_color_buffer_half_float").IsNull() && f.getExtension("EXT_color_buffer_float").IsNull() {
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return errors.New("gl: no support for neither EXT_color_buffer_half_float nor EXT_color_buffer_float")
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}
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}
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return nil
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}
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func (f *Functions) getExtension(name string) js.Value {
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return f.Ctx.Call("getExtension", name)
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}
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func (f *Functions) ActiveTexture(t Enum) {
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f.Ctx.Call("activeTexture", int(t))
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}
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func (f *Functions) AttachShader(p Program, s Shader) {
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f.Ctx.Call("attachShader", js.Value(p), js.Value(s))
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}
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func (f *Functions) BeginQuery(target Enum, query Query) {
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if !f.EXT_disjoint_timer_query_webgl2.IsNull() {
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f.Ctx.Call("beginQuery", int(target), js.Value(query))
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} else {
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f.EXT_disjoint_timer_query.Call("beginQueryEXT", int(target), js.Value(query))
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}
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}
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func (f *Functions) BindAttribLocation(p Program, a Attrib, name string) {
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f.Ctx.Call("bindAttribLocation", js.Value(p), int(a), name)
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}
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func (f *Functions) BindBuffer(target Enum, b Buffer) {
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f.Ctx.Call("bindBuffer", int(target), js.Value(b))
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}
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func (f *Functions) BindBufferBase(target Enum, index int, b Buffer) {
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f.Ctx.Call("bindBufferBase", int(target), index, js.Value(b))
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}
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func (f *Functions) BindFramebuffer(target Enum, fb Framebuffer) {
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f.Ctx.Call("bindFramebuffer", int(target), js.Value(fb))
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}
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func (f *Functions) BindRenderbuffer(target Enum, rb Renderbuffer) {
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f.Ctx.Call("bindRenderbuffer", int(target), js.Value(rb))
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}
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func (f *Functions) BindTexture(target Enum, t Texture) {
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f.Ctx.Call("bindTexture", int(target), js.Value(t))
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}
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func (f *Functions) BindImageTexture(unit int, t Texture, level int, layered bool, layer int, access, format Enum) {
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panic("not implemented")
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}
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func (f *Functions) BlendEquation(mode Enum) {
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f.Ctx.Call("blendEquation", int(mode))
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}
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func (f *Functions) BlendFunc(sfactor, dfactor Enum) {
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f.Ctx.Call("blendFunc", int(sfactor), int(dfactor))
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}
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func (f *Functions) BlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1 int, mask Enum, filter Enum) {
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panic("not implemented")
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}
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func (f *Functions) BufferData(target Enum, size int, usage Enum) {
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f.Ctx.Call("bufferData", int(target), size, int(usage))
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}
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func (f *Functions) BufferSubData(target Enum, offset int, src []byte) {
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f.Ctx.Call("bufferSubData", int(target), offset, f.byteArrayOf(src))
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}
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func (f *Functions) CheckFramebufferStatus(target Enum) Enum {
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return Enum(f.Ctx.Call("checkFramebufferStatus", int(target)).Int())
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}
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func (f *Functions) Clear(mask Enum) {
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f.Ctx.Call("clear", int(mask))
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}
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func (f *Functions) ClearColor(red, green, blue, alpha float32) {
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f.Ctx.Call("clearColor", red, green, blue, alpha)
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}
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func (f *Functions) ClearDepthf(d float32) {
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f.Ctx.Call("clearDepth", d)
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}
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func (f *Functions) CompileShader(s Shader) {
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f.Ctx.Call("compileShader", js.Value(s))
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}
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func (f *Functions) CreateBuffer() Buffer {
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return Buffer(f.Ctx.Call("createBuffer"))
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}
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func (f *Functions) CreateFramebuffer() Framebuffer {
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return Framebuffer(f.Ctx.Call("createFramebuffer"))
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}
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func (f *Functions) CreateProgram() Program {
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return Program(f.Ctx.Call("createProgram"))
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}
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func (f *Functions) CreateQuery() Query {
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return Query(f.Ctx.Call("createQuery"))
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}
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func (f *Functions) CreateRenderbuffer() Renderbuffer {
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return Renderbuffer(f.Ctx.Call("createRenderbuffer"))
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}
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func (f *Functions) CreateShader(ty Enum) Shader {
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return Shader(f.Ctx.Call("createShader", int(ty)))
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}
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func (f *Functions) CreateTexture() Texture {
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return Texture(f.Ctx.Call("createTexture"))
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}
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func (f *Functions) DeleteBuffer(v Buffer) {
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f.Ctx.Call("deleteBuffer", js.Value(v))
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}
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func (f *Functions) DeleteFramebuffer(v Framebuffer) {
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f.Ctx.Call("deleteFramebuffer", js.Value(v))
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}
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func (f *Functions) DeleteProgram(p Program) {
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f.Ctx.Call("deleteProgram", js.Value(p))
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}
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func (f *Functions) DeleteQuery(query Query) {
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if !f.EXT_disjoint_timer_query_webgl2.IsNull() {
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f.Ctx.Call("deleteQuery", js.Value(query))
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} else {
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f.EXT_disjoint_timer_query.Call("deleteQueryEXT", js.Value(query))
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}
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}
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func (f *Functions) DeleteShader(s Shader) {
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f.Ctx.Call("deleteShader", js.Value(s))
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}
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func (f *Functions) DeleteRenderbuffer(v Renderbuffer) {
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f.Ctx.Call("deleteRenderbuffer", js.Value(v))
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}
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func (f *Functions) DeleteTexture(v Texture) {
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f.Ctx.Call("deleteTexture", js.Value(v))
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}
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func (f *Functions) DepthFunc(fn Enum) {
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f.Ctx.Call("depthFunc", int(fn))
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}
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func (f *Functions) DepthMask(mask bool) {
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f.Ctx.Call("depthMask", mask)
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}
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func (f *Functions) DisableVertexAttribArray(a Attrib) {
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f.Ctx.Call("disableVertexAttribArray", int(a))
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}
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func (f *Functions) Disable(cap Enum) {
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f.Ctx.Call("disable", int(cap))
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}
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func (f *Functions) DrawArrays(mode Enum, first, count int) {
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f.Ctx.Call("drawArrays", int(mode), first, count)
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}
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func (f *Functions) DrawElements(mode Enum, count int, ty Enum, offset int) {
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f.Ctx.Call("drawElements", int(mode), count, int(ty), offset)
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}
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func (f *Functions) DispatchCompute(x, y, z int) {
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panic("not implemented")
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}
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func (f *Functions) Enable(cap Enum) {
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f.Ctx.Call("enable", int(cap))
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}
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func (f *Functions) EnableVertexAttribArray(a Attrib) {
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f.Ctx.Call("enableVertexAttribArray", int(a))
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}
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func (f *Functions) EndQuery(target Enum) {
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if !f.EXT_disjoint_timer_query_webgl2.IsNull() {
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f.Ctx.Call("endQuery", int(target))
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} else {
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f.EXT_disjoint_timer_query.Call("endQueryEXT", int(target))
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}
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}
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func (f *Functions) Finish() {
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f.Ctx.Call("finish")
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}
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func (f *Functions) FramebufferRenderbuffer(target, attachment, renderbuffertarget Enum, renderbuffer Renderbuffer) {
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f.Ctx.Call("framebufferRenderbuffer", int(target), int(attachment), int(renderbuffertarget), js.Value(renderbuffer))
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}
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func (f *Functions) FramebufferTexture2D(target, attachment, texTarget Enum, t Texture, level int) {
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f.Ctx.Call("framebufferTexture2D", int(target), int(attachment), int(texTarget), js.Value(t), level)
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}
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func (f *Functions) GetError() Enum {
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// Avoid slow getError calls. See gio#179.
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return 0
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}
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func (f *Functions) GetRenderbufferParameteri(target, pname Enum) int {
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return paramVal(f.Ctx.Call("getRenderbufferParameteri", int(pname)))
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}
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func (f *Functions) GetFramebufferAttachmentParameteri(target, attachment, pname Enum) int {
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return paramVal(f.Ctx.Call("getFramebufferAttachmentParameter", int(target), int(attachment), int(pname)))
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}
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func (f *Functions) GetBinding(pname Enum) Object {
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return Object(f.Ctx.Call("getParameter", int(pname)))
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}
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func (f *Functions) GetInteger(pname Enum) int {
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return paramVal(f.Ctx.Call("getParameter", int(pname)))
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}
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func (f *Functions) GetProgrami(p Program, pname Enum) int {
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return paramVal(f.Ctx.Call("getProgramParameter", js.Value(p), int(pname)))
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}
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func (f *Functions) GetProgramInfoLog(p Program) string {
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return f.Ctx.Call("getProgramInfoLog", js.Value(p)).String()
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}
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func (f *Functions) GetQueryObjectuiv(query Query, pname Enum) uint {
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if !f.EXT_disjoint_timer_query_webgl2.IsNull() {
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return uint(paramVal(f.Ctx.Call("getQueryParameter", js.Value(query), int(pname))))
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} else {
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return uint(paramVal(f.EXT_disjoint_timer_query.Call("getQueryObjectEXT", js.Value(query), int(pname))))
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}
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}
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func (f *Functions) GetShaderi(s Shader, pname Enum) int {
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return paramVal(f.Ctx.Call("getShaderParameter", js.Value(s), int(pname)))
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}
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func (f *Functions) GetShaderInfoLog(s Shader) string {
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return f.Ctx.Call("getShaderInfoLog", js.Value(s)).String()
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}
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func (f *Functions) GetString(pname Enum) string {
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switch pname {
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case EXTENSIONS:
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extsjs := f.Ctx.Call("getSupportedExtensions")
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var exts []string
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for i := 0; i < extsjs.Length(); i++ {
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exts = append(exts, "GL_"+extsjs.Index(i).String())
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}
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return strings.Join(exts, " ")
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default:
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return f.Ctx.Call("getParameter", int(pname)).String()
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}
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}
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func (f *Functions) GetUniformBlockIndex(p Program, name string) uint {
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return uint(paramVal(f.Ctx.Call("getUniformBlockIndex", js.Value(p), name)))
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}
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func (f *Functions) GetUniformLocation(p Program, name string) Uniform {
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return Uniform(f.Ctx.Call("getUniformLocation", js.Value(p), name))
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}
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func (f *Functions) InvalidateFramebuffer(target, attachment Enum) {
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fn := f.Ctx.Get("invalidateFramebuffer")
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if !fn.IsUndefined() {
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if f.int32Buf.IsUndefined() {
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f.int32Buf = js.Global().Get("Int32Array").New(1)
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}
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f.int32Buf.SetIndex(0, int32(attachment))
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f.Ctx.Call("invalidateFramebuffer", int(target), f.int32Buf)
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}
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}
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func (f *Functions) LinkProgram(p Program) {
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f.Ctx.Call("linkProgram", js.Value(p))
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}
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func (f *Functions) PixelStorei(pname Enum, param int32) {
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f.Ctx.Call("pixelStorei", int(pname), param)
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}
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func (f *Functions) MemoryBarrier(barriers Enum) {
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panic("not implemented")
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}
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func (f *Functions) MapBufferRange(target Enum, offset, length int, access Enum) []byte {
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panic("not implemented")
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}
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func (f *Functions) RenderbufferStorage(target, internalformat Enum, width, height int) {
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f.Ctx.Call("renderbufferStorage", int(target), int(internalformat), width, height)
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}
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func (f *Functions) ReadPixels(x, y, width, height int, format, ty Enum, data []byte) {
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ba := f.byteArrayOf(data)
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f.Ctx.Call("readPixels", x, y, width, height, int(format), int(ty), ba)
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js.CopyBytesToGo(data, ba)
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}
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func (f *Functions) Scissor(x, y, width, height int32) {
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f.Ctx.Call("scissor", x, y, width, height)
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}
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func (f *Functions) ShaderSource(s Shader, src string) {
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f.Ctx.Call("shaderSource", js.Value(s), src)
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}
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func (f *Functions) TexImage2D(target Enum, level int, internalFormat Enum, width, height int, format, ty Enum) {
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f.Ctx.Call("texImage2D", int(target), int(level), int(internalFormat), int(width), int(height), 0, int(format), int(ty), nil)
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}
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func (f *Functions) TexStorage2D(target Enum, levels int, internalFormat Enum, width, height int) {
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f.Ctx.Call("texStorage2D", int(target), levels, int(internalFormat), width, height)
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}
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func (f *Functions) TexSubImage2D(target Enum, level int, x, y, width, height int, format, ty Enum, data []byte) {
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f.Ctx.Call("texSubImage2D", int(target), level, x, y, width, height, int(format), int(ty), f.byteArrayOf(data))
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}
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func (f *Functions) TexParameteri(target, pname Enum, param int) {
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f.Ctx.Call("texParameteri", int(target), int(pname), int(param))
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}
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func (f *Functions) UniformBlockBinding(p Program, uniformBlockIndex uint, uniformBlockBinding uint) {
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f.Ctx.Call("uniformBlockBinding", js.Value(p), int(uniformBlockIndex), int(uniformBlockBinding))
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}
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func (f *Functions) Uniform1f(dst Uniform, v float32) {
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f.Ctx.Call("uniform1f", js.Value(dst), v)
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}
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func (f *Functions) Uniform1i(dst Uniform, v int) {
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f.Ctx.Call("uniform1i", js.Value(dst), v)
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}
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func (f *Functions) Uniform2f(dst Uniform, v0, v1 float32) {
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f.Ctx.Call("uniform2f", js.Value(dst), v0, v1)
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}
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func (f *Functions) Uniform3f(dst Uniform, v0, v1, v2 float32) {
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f.Ctx.Call("uniform3f", js.Value(dst), v0, v1, v2)
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}
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func (f *Functions) Uniform4f(dst Uniform, v0, v1, v2, v3 float32) {
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f.Ctx.Call("uniform4f", js.Value(dst), v0, v1, v2, v3)
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}
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func (f *Functions) UseProgram(p Program) {
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f.Ctx.Call("useProgram", js.Value(p))
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}
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func (f *Functions) UnmapBuffer(target Enum) bool {
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panic("not implemented")
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}
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func (f *Functions) VertexAttribPointer(dst Attrib, size int, ty Enum, normalized bool, stride, offset int) {
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f.Ctx.Call("vertexAttribPointer", int(dst), size, int(ty), normalized, stride, offset)
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}
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func (f *Functions) Viewport(x, y, width, height int) {
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f.Ctx.Call("viewport", x, y, width, height)
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}
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func (f *Functions) byteArrayOf(data []byte) js.Value {
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if len(data) == 0 {
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return js.Null()
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}
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f.resizeByteBuffer(len(data))
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ba := f.uint8Array.New(f.arrayBuf, int(0), int(len(data)))
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js.CopyBytesToJS(ba, data)
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return ba
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}
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func (f *Functions) resizeByteBuffer(n int) {
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if n == 0 {
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return
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}
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if !f.arrayBuf.IsUndefined() && f.arrayBuf.Length() >= n {
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return
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}
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f.arrayBuf = js.Global().Get("ArrayBuffer").New(n)
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}
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func paramVal(v js.Value) int {
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switch v.Type() {
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case js.TypeBoolean:
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if b := v.Bool(); b {
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return 1
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} else {
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return 0
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}
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case js.TypeNumber:
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return v.Int()
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default:
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panic("unknown parameter type")
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}
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}
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