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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_unix.go
+74 -9
View File
@@ -42,7 +42,7 @@ typedef struct {
void (*glBindRenderbuffer)(GLenum target, GLuint renderbuffer);
void (*glBindTexture)(GLenum target, GLuint texture);
void (*glBlendEquation)(GLenum mode);
void (*glBlendFunc)(GLenum sfactor, GLenum dfactor);
void (*glBlendFuncSeparate)(GLenum srcRGB, GLenum dstRGB, GLenum srcA, GLenum dstA);
void (*glBufferData)(GLenum target, GLsizeiptr size, const void *data, GLenum usage);
void (*glBufferSubData)(GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
GLenum (*glCheckFramebufferStatus)(GLenum target);
@@ -76,7 +76,9 @@ typedef struct {
void (*glGenTextures)(GLsizei n, GLuint *textures);
GLenum (*glGetError)(void);
void (*glGetFramebufferAttachmentParameteriv)(GLenum target, GLenum attachment, GLenum pname, GLint *params);
void (*glGetFloatv)(GLenum pname, GLfloat *data);
void (*glGetIntegerv)(GLenum pname, GLint *data);
void (*glGetIntegeri_v)(GLenum pname, GLuint idx, GLint *data);
void (*glGetProgramiv)(GLuint program, GLenum pname, GLint *params);
void (*glGetProgramInfoLog)(GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
void (*glGetRenderbufferParameteriv)(GLenum target, GLenum pname, GLint *params);
@@ -84,6 +86,8 @@ typedef struct {
void (*glGetShaderInfoLog)(GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
const GLubyte *(*glGetString)(GLenum name);
GLint (*glGetUniformLocation)(GLuint program, const GLchar *name);
void (*glGetVertexAttribiv)(GLuint index, GLenum pname, GLint *params);
void (*glGetVertexAttribPointerv)(GLuint index, GLenum pname, void **params);
GLboolean (*glIsEnabled)(GLenum cap);
void (*glLinkProgram)(GLuint program);
void (*glPixelStorei)(GLenum pname, GLint param);
@@ -162,8 +166,8 @@ static void glBlendEquation(glFunctions *f, GLenum mode) {
f->glBlendEquation(mode);
}
static void glBlendFunc(glFunctions *f, GLenum sfactor, GLenum dfactor) {
f->glBlendFunc(sfactor, dfactor);
static void glBlendFuncSeparate(glFunctions *f, GLenum srcRGB, GLenum dstRGB, GLenum srcA, GLenum dstA) {
f->glBlendFuncSeparate(srcRGB, dstRGB, srcA, dstA);
}
static void glBufferData(glFunctions *f, GLenum target, GLsizeiptr size, const void *data, GLenum usage) {
@@ -303,6 +307,14 @@ static void glGetIntegerv(glFunctions *f, GLenum pname, GLint *data) {
f->glGetIntegerv(pname, data);
}
static void glGetFloatv(glFunctions *f, GLenum pname, GLfloat *data) {
f->glGetFloatv(pname, data);
}
static void glGetIntegeri_v(glFunctions *f, GLenum pname, GLuint idx, GLint *data) {
f->glGetIntegeri_v(pname, idx, data);
}
static void glGetProgramiv(glFunctions *f, GLuint program, GLenum pname, GLint *params) {
f->glGetProgramiv(program, pname, params);
}
@@ -331,6 +343,17 @@ static GLint glGetUniformLocation(glFunctions *f, GLuint program, const GLchar *
return f->glGetUniformLocation(program, name);
}
static void glGetVertexAttribiv(glFunctions *f, GLuint index, GLenum pname, GLint *data) {
f->glGetVertexAttribiv(index, pname, data);
}
// Return uintptr_t to avoid Cgo pointer check.
static uintptr_t glGetVertexAttribPointerv(glFunctions *f, GLuint index, GLenum pname) {
void *ptrs;
f->glGetVertexAttribPointerv(index, pname, &ptrs);
return (uintptr_t)ptrs;
}
static GLboolean glIsEnabled(glFunctions *f, GLenum cap) {
return f->glIsEnabled(cap);
}
@@ -493,8 +516,9 @@ type Context interface{}
type Functions struct {
// Query caches.
uints [100]C.GLuint
ints [100]C.GLint
uints [100]C.GLuint
ints [100]C.GLint
floats [100]C.GLfloat
f C.glFunctions
}
@@ -571,7 +595,7 @@ func (f *Functions) load(forceES bool) error {
f.f.glBindRenderbuffer = must("glBindRenderbuffer")
f.f.glBindTexture = must("glBindTexture")
f.f.glBlendEquation = must("glBlendEquation")
f.f.glBlendFunc = must("glBlendFunc")
f.f.glBlendFuncSeparate = must("glBlendFuncSeparate")
f.f.glBufferData = must("glBufferData")
f.f.glBufferSubData = must("glBufferSubData")
f.f.glCheckFramebufferStatus = must("glCheckFramebufferStatus")
@@ -606,6 +630,7 @@ func (f *Functions) load(forceES bool) error {
f.f.glGetError = must("glGetError")
f.f.glGetFramebufferAttachmentParameteriv = must("glGetFramebufferAttachmentParameteriv")
f.f.glGetIntegerv = must("glGetIntegerv")
f.f.glGetFloatv = must("glGetFloatv")
f.f.glGetProgramiv = must("glGetProgramiv")
f.f.glGetProgramInfoLog = must("glGetProgramInfoLog")
f.f.glGetRenderbufferParameteriv = must("glGetRenderbufferParameteriv")
@@ -613,6 +638,8 @@ func (f *Functions) load(forceES bool) error {
f.f.glGetShaderInfoLog = must("glGetShaderInfoLog")
f.f.glGetString = must("glGetString")
f.f.glGetUniformLocation = must("glGetUniformLocation")
f.f.glGetVertexAttribiv = must("glGetVertexAttribiv")
f.f.glGetVertexAttribPointerv = must("glGetVertexAttribPointerv")
f.f.glIsEnabled = must("glIsEnabled")
f.f.glLinkProgram = must("glLinkProgram")
f.f.glPixelStorei = must("glPixelStorei")
@@ -634,7 +661,8 @@ func (f *Functions) load(forceES bool) error {
// Extensions and GL ES 3 functions.
f.f.glBindBufferBase = load("glBindBufferBase")
f.f.glBindVertexArray = must("glBindVertexArray")
f.f.glBindVertexArray = load("glBindVertexArray")
f.f.glGetIntegeri_v = load("glGetIntegeri_v")
f.f.glGetUniformBlockIndex = load("glGetUniformBlockIndex")
f.f.glUniformBlockBinding = load("glUniformBlockBinding")
f.f.glInvalidateFramebuffer = load("glInvalidateFramebuffer")
@@ -733,8 +761,8 @@ func (f *Functions) BlendEquation(mode Enum) {
C.glBlendEquation(&f.f, C.GLenum(mode))
}
func (f *Functions) BlendFunc(sfactor, dfactor Enum) {
C.glBlendFunc(&f.f, C.GLenum(sfactor), C.GLenum(dfactor))
func (f *Functions) BlendFuncSeparate(srcRGB, dstRGB, srcA, dstA Enum) {
C.glBlendFuncSeparate(&f.f, C.GLenum(srcRGB), C.GLenum(dstRGB), C.GLenum(srcA), C.GLenum(dstA))
}
func (f *Functions) BlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1 int, mask Enum, filter Enum) {
@@ -917,6 +945,10 @@ 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 (f *Functions) GetError() Enum {
return Enum(C.glGetError(&f.f))
}
@@ -931,6 +963,20 @@ func (f *Functions) GetFramebufferAttachmentParameteri(target, attachment, pname
return int(f.ints[0])
}
func (f *Functions) GetFloat4(pname Enum) [4]float32 {
C.glGetFloatv(&f.f, C.GLenum(pname), &f.floats[0])
var r [4]float32
for i := range r {
r[i] = float32(f.floats[i])
}
return r
}
func (f *Functions) GetFloat(pname Enum) float32 {
C.glGetFloatv(&f.f, C.GLenum(pname), &f.floats[0])
return float32(f.floats[0])
}
func (f *Functions) GetInteger4(pname Enum) [4]int {
C.glGetIntegerv(&f.f, C.GLenum(pname), &f.ints[0])
var r [4]int
@@ -945,6 +991,11 @@ func (f *Functions) GetInteger(pname Enum) int {
return int(f.ints[0])
}
func (f *Functions) GetIntegeri(pname Enum, idx int) int {
C.glGetIntegeri_v(&f.f, C.GLenum(pname), C.GLuint(idx), &f.ints[0])
return int(f.ints[0])
}
func (f *Functions) GetProgrami(p Program, pname Enum) int {
C.glGetProgramiv(&f.f, C.GLuint(p.V), C.GLenum(pname), &f.ints[0])
return int(f.ints[0])
@@ -1023,6 +1074,20 @@ func (f *Functions) GetUniformLocation(p Program, name string) Uniform {
return Uniform{int(C.glGetUniformLocation(&f.f, C.GLuint(p.V), cname))}
}
func (f *Functions) GetVertexAttrib(index int, pname Enum) int {
C.glGetVertexAttribiv(&f.f, C.GLuint(index), C.GLenum(pname), &f.ints[0])
return int(f.ints[0])
}
func (f *Functions) GetVertexAttribBinding(index int, pname Enum) Object {
return Object{uint(f.GetVertexAttrib(index, pname))}
}
func (f *Functions) GetVertexAttribPointer(index int, pname Enum) uintptr {
ptr := C.glGetVertexAttribPointerv(&f.f, C.GLuint(index), C.GLenum(pname))
return uintptr(ptr)
}
func (f *Functions) InvalidateFramebuffer(target, attachment Enum) {
C.glInvalidateFramebuffer(&f.f, C.GLenum(target), C.GLenum(attachment))
}