~eliasnaur/gio

2a0b0077da6f4065b5ec1e0989e07975ec1614bc — Elias Naur 6 months ago 7bc18c0
ui/app: (wasm) add checks for required extensions

Signed-off-by: Elias Naur <mail@eliasnaur.com>
2 files changed, 21 insertions(+), 11 deletions(-)

M ui/app/gl_js.go
M ui/app/internal/gl/gl_js.go
M ui/app/gl_js.go => ui/app/gl_js.go +5 -1
@@ 23,15 23,19 @@ func newContext(w *window) (*context, error) {
		"desynchronized":        true,
		"preserveDrawingBuffer": true,
	}
	version := 2
	ctx := w.cnv.Call("getContext", "webgl2", args)
	if ctx == js.Null() {
		version = 1
		ctx = w.cnv.Call("getContext", "webgl", args)
	}
	if ctx == js.Null() {
		return nil, errors.New("app: webgl is not supported")
	}
	f := &gl.Functions{Ctx: ctx}
	f.Init()
	if err := f.Init(version); err != nil {
		return nil, err
	}
	c := &context{
		ctx: ctx,
		cnv: w.cnv,

M ui/app/internal/gl/gl_js.go => ui/app/internal/gl/gl_js.go +16 -10
@@ 3,6 3,7 @@
package gl

import (
	"errors"
	"strings"
	"syscall/js"
)


@@ 17,18 18,23 @@ type Functions struct {
	int32Buf js.Value
}

func (f *Functions) Init() {
	f.EXT_disjoint_timer_query_webgl2 = f.getExtension("EXT_disjoint_timer_query_webgl2")
	if f.EXT_disjoint_timer_query_webgl2 == js.Null() {
func (f *Functions) Init(version int) error {
	if version < 2 {
		f.EXT_disjoint_timer_query = f.getExtension("EXT_disjoint_timer_query")
		if f.getExtension("OES_texture_half_float") == js.Null() && f.getExtension("OES_texture_float") == js.Null() {
			return errors.New("gl: no support for neither OES_texture_half_float nor OES_texture_float")
		}
		if f.getExtension("EXT_sRGB") == js.Null() {
			return errors.New("gl: EXT_sRGB not supported")
		}
	} else {
		// WebGL2 extensions.
		f.EXT_disjoint_timer_query_webgl2 = f.getExtension("EXT_disjoint_timer_query_webgl2")
		if f.getExtension("EXT_color_buffer_half_float") == js.Null() && f.getExtension("EXT_color_buffer_float") == js.Null() {
			return errors.New("gl: no support for neither EXT_color_buffer_half_float nor EXT_color_buffer_float")
		}
	}
	// Enable extensions.
	f.getExtension("OES_texture_half_float")
	f.getExtension("OES_texture_float")
	f.getExtension("EXT_sRGB")
	// WebGL2 extensions
	f.getExtension("EXT_color_buffer_half_float")
	f.getExtension("EXT_color_buffer_float")
	return nil
}

func (f *Functions) getExtension(name string) js.Value {