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gpu/internal/opengl: restore BeginFrame state in EndFrame

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To ease the integration with foreign OpenGL contexts, carefully save the
context state before rendering a frame and restore it afterwards. Gio
rendering can then be mixed with OpenGL code that expects exclusive
control over context state.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-06-10 20:14:32 +02:00
parent 200957f924
commit 9b5e9ae607
9 changed files with 813 additions and 188 deletions
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internal/gl/gl_js.go
+46 -3
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@@ -101,8 +101,8 @@ func (f *Functions) BindVertexArray(a VertexArray) {
func (f *Functions) BlendEquation(mode Enum) {
f.Ctx.Call("blendEquation", int(mode))
}
func (f *Functions) BlendFunc(sfactor, dfactor Enum) {
f.Ctx.Call("blendFunc", int(sfactor), int(dfactor))
func (f *Functions) BlendFuncSeparate(srcRGB, dstRGB, srcA, dstA Enum) {
f.Ctx.Call("blendFunc", int(srcRGB), int(dstRGB), int(srcA), int(dstA))
}
func (f *Functions) BlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1 int, mask Enum, filter Enum) {
panic("not implemented")
@@ -241,11 +241,41 @@ func (f *Functions) GetFramebufferAttachmentParameteri(target, attachment, pname
return paramVal(f.Ctx.Call("getFramebufferAttachmentParameter", int(target), int(attachment), int(pname)))
}
func (f *Functions) GetBinding(pname Enum) Object {
return Object(f.Ctx.Call("getParameter", int(pname)))
obj := f.Ctx.Call("getParameter", int(pname))
if !obj.Truthy() {
return Object{}
}
return Object(obj)
}
func (f *Functions) GetBindingi(pname Enum, idx int) Object {
obj := f.Ctx.Call("getIndexedParameter", int(pname), idx)
if !obj.Truthy() {
return Object{}
}
return Object(obj)
}
func (f *Functions) GetInteger(pname Enum) int {
return paramVal(f.Ctx.Call("getParameter", int(pname)))
}
func (f *Functions) GetFloat(pname Enum) float32 {
return float32(f.Ctx.Call("getParameter", int(pname)).Float())
}
func (f *Functions) GetInteger4(pname Enum) [4]int {
arr := f.Ctx.Call("getParameter", int(pname))
var res [4]int
for i := range res {
res[i] = arr.Index(i).Int()
}
return res
}
func (f *Functions) GetFloat4(pname Enum) [4]float32 {
arr := f.Ctx.Call("getParameter", int(pname))
var res [4]float32
for i := range res {
res[i] = float32(arr.Index(i).Float())
}
return res
}
func (f *Functions) GetProgrami(p Program, pname Enum) int {
return paramVal(f.Ctx.Call("getProgramParameter", js.Value(p), int(pname)))
}
@@ -284,6 +314,19 @@ func (f *Functions) GetUniformBlockIndex(p Program, name string) uint {
func (f *Functions) GetUniformLocation(p Program, name string) Uniform {
return Uniform(f.Ctx.Call("getUniformLocation", js.Value(p), name))
}
func (f *Functions) GetVertexAttrib(index int, pname Enum) int {
return paramVal(f.Ctx.Call("getVertexAttrib", index, int(pname)))
}
func (f *Functions) GetVertexAttribBinding(index int, pname Enum) Object {
obj := f.Ctx.Call("getVertexAttrib", index, int(pname))
if !obj.Truthy() {
return Object{}
}
return Object(obj)
}
func (f *Functions) GetVertexAttribPointer(index int, pname Enum) uintptr {
return uintptr(f.Ctx.Call("getVertexAttribOffset", index, int(pname)).Int())
}
func (f *Functions) InvalidateFramebuffer(target, attachment Enum) {
fn := f.Ctx.Get("invalidateFramebuffer")
if !fn.IsUndefined() {