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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_windows.go
+40 -4
View File
@@ -24,7 +24,7 @@ var (
_glBindTexture = LibGLESv2.NewProc("glBindTexture")
_glBindVertexArray = LibGLESv2.NewProc("glBindVertexArray")
_glBlendEquation = LibGLESv2.NewProc("glBlendEquation")
_glBlendFunc = LibGLESv2.NewProc("glBlendFunc")
_glBlendFuncSeparate = LibGLESv2.NewProc("glBlendFuncSeparate")
_glBufferData = LibGLESv2.NewProc("glBufferData")
_glBufferSubData = LibGLESv2.NewProc("glBufferSubData")
_glCheckFramebufferStatus = LibGLESv2.NewProc("glCheckFramebufferStatus")
@@ -64,8 +64,10 @@ var (
_glGenQueries = LibGLESv2.NewProc("glGenQueries")
_glGetError = LibGLESv2.NewProc("glGetError")
_glGetRenderbufferParameteriv = LibGLESv2.NewProc("glGetRenderbufferParameteriv")
_glGetFloatv = LibGLESv2.NewProc("glGetFloatv")
_glGetFramebufferAttachmentParameteriv = LibGLESv2.NewProc("glGetFramebufferAttachmentParameteriv")
_glGetIntegerv = LibGLESv2.NewProc("glGetIntegerv")
_glGetIntegeri_v = LibGLESv2.NewProc("glGetIntegeri_v")
_glGetProgramiv = LibGLESv2.NewProc("glGetProgramiv")
_glGetProgramInfoLog = LibGLESv2.NewProc("glGetProgramInfoLog")
_glGetQueryObjectuiv = LibGLESv2.NewProc("glGetQueryObjectuiv")
@@ -73,6 +75,8 @@ var (
_glGetShaderInfoLog = LibGLESv2.NewProc("glGetShaderInfoLog")
_glGetString = LibGLESv2.NewProc("glGetString")
_glGetUniformLocation = LibGLESv2.NewProc("glGetUniformLocation")
_glGetVertexAttribiv = LibGLESv2.NewProc("glGetVertexAttribiv")
_glGetVertexAttribPointerv = LibGLESv2.NewProc("glGetVertexAttribPointerv")
_glInvalidateFramebuffer = LibGLESv2.NewProc("glInvalidateFramebuffer")
_glIsEnabled = LibGLESv2.NewProc("glIsEnabled")
_glLinkProgram = LibGLESv2.NewProc("glLinkProgram")
@@ -98,7 +102,9 @@ var (
type Functions struct {
// Query caches.
int32s [100]int32
int32s [100]int32
float32s [100]float32
uintptrs [100]uintptr
}
type Context interface{}
@@ -149,8 +155,8 @@ func (c *Functions) BindVertexArray(a VertexArray) {
func (c *Functions) BlendEquation(mode Enum) {
syscall.Syscall(_glBlendEquation.Addr(), 1, uintptr(mode), 0, 0)
}
func (c *Functions) BlendFunc(sfactor, dfactor Enum) {
syscall.Syscall(_glBlendFunc.Addr(), 2, uintptr(sfactor), uintptr(dfactor), 0)
func (c *Functions) BlendFuncSeparate(srcRGB, dstRGB, srcA, dstA Enum) {
syscall.Syscall6(_glBlendFuncSeparate.Addr(), 4, uintptr(srcRGB), uintptr(dstRGB), uintptr(srcA), uintptr(dstA), 0, 0)
}
func (f *Functions) BlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1 int, mask Enum, filter Enum) {
panic("not implemented")
@@ -299,6 +305,9 @@ func (f *Functions) GetUniformBlockIndex(p Program, name string) uint {
func (c *Functions) GetBinding(pname Enum) Object {
return Object{uint(c.GetInteger(pname))}
}
func (c *Functions) GetBindingi(pname Enum, idx int) Object {
return Object{uint(c.GetIntegeri(pname, idx))}
}
func (c *Functions) GetError() Enum {
e, _, _ := syscall.Syscall(_glGetError.Addr(), 0, 0, 0, 0)
return Enum(e)
@@ -323,6 +332,20 @@ func (c *Functions) GetInteger(pname Enum) int {
syscall.Syscall(_glGetIntegerv.Addr(), 2, uintptr(pname), uintptr(unsafe.Pointer(&c.int32s[0])), 0)
return int(c.int32s[0])
}
func (c *Functions) GetIntegeri(pname Enum, idx int) int {
syscall.Syscall(_glGetIntegeri_v.Addr(), 3, uintptr(pname), uintptr(idx), uintptr(unsafe.Pointer(&c.int32s[0])))
return int(c.int32s[0])
}
func (c *Functions) GetFloat(pname Enum) float32 {
syscall.Syscall(_glGetFloatv.Addr(), 2, uintptr(pname), uintptr(unsafe.Pointer(&c.float32s[0])), 0)
return c.float32s[0]
}
func (c *Functions) GetFloat4(pname Enum) [4]float32 {
syscall.Syscall(_glGetFloatv.Addr(), 2, uintptr(pname), uintptr(unsafe.Pointer(&c.float32s[0])), 0)
var r [4]float32
copy(r[:], c.float32s[:])
return r
}
func (c *Functions) GetProgrami(p Program, pname Enum) int {
syscall.Syscall(_glGetProgramiv.Addr(), 3, uintptr(p.V), uintptr(pname), uintptr(unsafe.Pointer(&c.int32s[0])))
return int(c.int32s[0])
@@ -358,6 +381,19 @@ func (c *Functions) GetUniformLocation(p Program, name string) Uniform {
issue34474KeepAlive(c0)
return Uniform{int(u)}
}
func (c *Functions) GetVertexAttrib(index int, pname Enum) int {
syscall.Syscall(_glGetVertexAttribiv.Addr(), 3, uintptr(index), uintptr(pname), uintptr(unsafe.Pointer(&c.int32s[0])))
return int(c.int32s[0])
}
func (c *Functions) GetVertexAttribBinding(index int, pname Enum) Object {
return Object{uint(c.GetVertexAttrib(index, pname))}
}
func (c *Functions) GetVertexAttribPointer(index int, pname Enum) uintptr {
syscall.Syscall(_glGetVertexAttribPointerv.Addr(), 3, uintptr(index), uintptr(pname), uintptr(unsafe.Pointer(&c.uintptrs[0])))
return c.uintptrs[0]
}
func (c *Functions) InvalidateFramebuffer(target, attachment Enum) {
addr := _glInvalidateFramebuffer.Addr()
if addr == 0 {