bool
SharedSurface_IOSurface::ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type, GLvoid* pixels)
{
// Calling glReadPixels when an IOSurface is bound to the current framebuffer
// can cause corruption in following glReadPixel calls (even if they aren't
// reading from an IOSurface).
// We workaround this by copying to a temporary texture, and doing the readback
// from that.
MOZ_ASSERT(mGL->IsCurrent());
ScopedTexture destTex(mGL);
{
ScopedFramebufferForTexture srcFB(mGL, ProdTexture(), ProdTextureTarget());
ScopedBindFramebuffer bindFB(mGL, srcFB.FB());
ScopedBindTexture bindTex(mGL, destTex.Texture());
mGL->raw_fCopyTexImage2D(LOCAL_GL_TEXTURE_2D, 0,
mHasAlpha ? LOCAL_GL_RGBA : LOCAL_GL_RGB,
x, y,
width, height, 0);
}
ScopedFramebufferForTexture destFB(mGL, destTex.Texture());
ScopedBindFramebuffer bindFB(mGL, destFB.FB());
mGL->raw_fReadPixels(0, 0, width, height, format, type, pixels);
return true;
}
bool
SharedSurface_IOSurface::CopyTexImage2D(GLenum target, GLint level, GLenum internalformat,
GLint x, GLint y, GLsizei width, GLsizei height,
GLint border)
{
/* Bug 896693 - OpenGL framebuffers that are backed by IOSurface on OSX expose a bug
* in glCopyTexImage2D --- internalformats GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA
* return the wrong results. To work around, copy framebuffer to a temporary texture
* using GL_RGBA (which works), attach as read framebuffer and glCopyTexImage2D
* instead.
*/
// https://www.opengl.org/sdk/docs/man3/xhtml/glCopyTexImage2D.xml says that width or
// height set to 0 results in a NULL texture. Lets not do any work and punt to
// original glCopyTexImage2D, since the FBO below will fail when trying to attach a
// texture of 0 width or height.
if (width == 0 || height == 0)
return false;
switch (internalformat) {
case LOCAL_GL_ALPHA:
case LOCAL_GL_LUMINANCE:
case LOCAL_GL_LUMINANCE_ALPHA:
break;
default:
return false;
}
MOZ_ASSERT(mGL->IsCurrent());
ScopedTexture destTex(mGL);
{
ScopedBindTexture bindTex(mGL, destTex.Texture());
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MIN_FILTER,
LOCAL_GL_NEAREST);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MAG_FILTER,
LOCAL_GL_NEAREST);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_S,
LOCAL_GL_CLAMP_TO_EDGE);
mGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_T,
LOCAL_GL_CLAMP_TO_EDGE);
mGL->raw_fCopyTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA, x, y, width,
height, 0);
}
ScopedFramebufferForTexture tmpFB(mGL, destTex.Texture(), LOCAL_GL_TEXTURE_2D);
ScopedBindFramebuffer bindFB(mGL, tmpFB.FB());
mGL->raw_fCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
return true;
}
bool
TexUnpackImage::TexOrSubImage(bool isSubImage, bool needsRespec, const char* funcName,
WebGLTexture* tex, TexImageTarget target, GLint level,
const webgl::DriverUnpackInfo* dui, GLint xOffset,
GLint yOffset, GLint zOffset, GLenum* const out_error) const
{
MOZ_ASSERT_IF(needsRespec, !isSubImage);
WebGLContext* webgl = tex->mContext;
gl::GLContext* gl = webgl->GL();
gl->MakeCurrent();
if (needsRespec) {
*out_error = DoTexOrSubImage(isSubImage, gl, target.get(), level, dui, xOffset,
yOffset, zOffset, mWidth, mHeight, mDepth,
nullptr);
if (*out_error)
return false;
}
do {
if (mDepth != 1)
break;
const bool isDstPremult = webgl->mPixelStore_PremultiplyAlpha;
if (mIsSrcPremult != isDstPremult)
break;
if (dui->unpackFormat != LOCAL_GL_RGB && dui->unpackFormat != LOCAL_GL_RGBA)
break;
if (dui->unpackType != LOCAL_GL_UNSIGNED_BYTE)
break;
gl::ScopedFramebuffer scopedFB(gl);
gl::ScopedBindFramebuffer bindFB(gl, scopedFB.FB());
{
gl::GLContext::LocalErrorScope errorScope(*gl);
gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
target.get(), tex->mGLName, level);
if (errorScope.GetError())
break;
}
const GLenum status = gl->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE)
break;
const gfx::IntSize destSize(mWidth, mHeight);
const auto dstOrigin = (webgl->mPixelStore_FlipY ? gl::OriginPos::TopLeft
: gl::OriginPos::BottomLeft);
if (!gl->BlitHelper()->BlitImageToFramebuffer(mImage, destSize, scopedFB.FB(),
dstOrigin))
{
break;
}
// Blitting was successful, so we're done!
*out_error = 0;
return true;
} while (false);
webgl->GenerateWarning("%s: Failed to hit GPU-copy fast-path. Falling back to CPU"
" upload.",
funcName);
const RefPtr<gfx::SourceSurface> surf = mImage->GetAsSourceSurface();
RefPtr<gfx::DataSourceSurface> dataSurf;
if (surf) {
// WARNING: OSX can lose our MakeCurrent here.
dataSurf = surf->GetDataSurface();
}
if (!dataSurf) {
webgl->ErrorOutOfMemory("%s: GetAsSourceSurface or GetDataSurface failed after"
" blit failed for TexUnpackImage.",
funcName);
return false;
}
const TexUnpackSurface surfBlob(webgl, target, mWidth, mHeight, mDepth, dataSurf,
mIsSrcPremult);
return surfBlob.TexOrSubImage(isSubImage, needsRespec, funcName, tex, target, level,
dui, xOffset, yOffset, zOffset, out_error);
}
bool
TexUnpackImage::TexOrSubImage(bool isSubImage, bool needsRespec, const char* funcName,
WebGLTexture* tex, TexImageTarget target, GLint level,
const webgl::DriverUnpackInfo* dui, GLint xOffset,
GLint yOffset, GLint zOffset, const webgl::PackingInfo& pi,
GLenum* const out_error) const
{
MOZ_ASSERT_IF(needsRespec, !isSubImage);
WebGLContext* webgl = tex->mContext;
gl::GLContext* gl = webgl->GL();
gl->MakeCurrent();
if (needsRespec) {
*out_error = DoTexOrSubImage(isSubImage, gl, target.get(), level, dui, xOffset,
yOffset, zOffset, mWidth, mHeight, mDepth,
nullptr);
if (*out_error)
return true;
}
const char* fallbackReason;
do {
if (mDepth != 1) {
fallbackReason = "depth is not 1";
break;
}
if (webgl->mPixelStore_UnpackSkipPixels ||
webgl->mPixelStore_UnpackSkipRows ||
webgl->mPixelStore_UnpackSkipImages)
{
fallbackReason = "non-zero UNPACK_SKIP_* not yet supported";
break;
}
const auto fnHasPremultMismatch = [&]() {
if (mSrcAlphaType == gfxAlphaType::Opaque)
return false;
const bool srcIsPremult = (mSrcAlphaType == gfxAlphaType::Premult);
const auto& dstIsPremult = webgl->mPixelStore_PremultiplyAlpha;
if (srcIsPremult == dstIsPremult)
return false;
if (dstIsPremult) {
fallbackReason = "UNPACK_PREMULTIPLY_ALPHA_WEBGL is not true";
} else {
fallbackReason = "UNPACK_PREMULTIPLY_ALPHA_WEBGL is not false";
}
return true;
};
if (fnHasPremultMismatch())
break;
if (dui->unpackFormat != LOCAL_GL_RGB && dui->unpackFormat != LOCAL_GL_RGBA) {
fallbackReason = "`format` is not RGB or RGBA";
break;
}
if (dui->unpackType != LOCAL_GL_UNSIGNED_BYTE) {
fallbackReason = "`type` is not UNSIGNED_BYTE";
break;
}
gl::ScopedFramebuffer scopedFB(gl);
gl::ScopedBindFramebuffer bindFB(gl, scopedFB.FB());
{
gl::GLContext::LocalErrorScope errorScope(*gl);
gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
target.get(), tex->mGLName, level);
if (errorScope.GetError()) {
fallbackReason = "bug: failed to attach to FB for blit";
break;
}
}
const GLenum status = gl->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
fallbackReason = "bug: failed to confirm FB for blit";
break;
}
const gfx::IntSize destSize(mWidth, mHeight);
const auto dstOrigin = (webgl->mPixelStore_FlipY ? gl::OriginPos::TopLeft
: gl::OriginPos::BottomLeft);
if (!gl->BlitHelper()->BlitImageToFramebuffer(mImage, destSize, scopedFB.FB(),
dstOrigin))
{
fallbackReason = "likely bug: failed to blit";
break;
}
// Blitting was successful, so we're done!
*out_error = 0;
return true;
} while (false);
const nsPrintfCString perfMsg("%s: Failed to hit GPU-copy fast-path: %s (src type %u)",
funcName, fallbackReason, uint32_t(mImage->GetFormat()));
if (webgl->mPixelStore_RequireFastPath) {
webgl->ErrorInvalidOperation("%s", perfMsg.BeginReading());
return false;
}
webgl->GeneratePerfWarning("%s Falling back to CPU upload.",
perfMsg.BeginReading());
const RefPtr<gfx::SourceSurface> surf = mImage->GetAsSourceSurface();
RefPtr<gfx::DataSourceSurface> dataSurf;
if (surf) {
// WARNING: OSX can lose our MakeCurrent here.
dataSurf = surf->GetDataSurface();
}
if (!dataSurf) {
webgl->ErrorOutOfMemory("%s: GetAsSourceSurface or GetDataSurface failed after"
" blit failed for TexUnpackImage.",
funcName);
return false;
}
const TexUnpackSurface surfBlob(webgl, target, mWidth, mHeight, mDepth, dataSurf,
mSrcAlphaType);
return surfBlob.TexOrSubImage(isSubImage, needsRespec, funcName, tex, target, level,
dui, xOffset, yOffset, zOffset, pi, out_error);
}
void
TexUnpackImage::TexOrSubImage(bool isSubImage, bool needsRespec, const char* funcName,
WebGLTexture* tex, TexImageTarget target, GLint level,
const webgl::DriverUnpackInfo* dui, GLint xOffset,
GLint yOffset, GLint zOffset, GLenum* const out_glError)
{
MOZ_ASSERT_IF(needsRespec, !isSubImage);
*out_glError = 0;
WebGLContext* webgl = tex->mContext;
gl::GLContext* gl = webgl->GL();
gl->MakeCurrent();
if (needsRespec) {
GLenum error = DoTexOrSubImage(isSubImage, gl, target.get(), level, dui, xOffset,
yOffset, zOffset, mWidth, mHeight, mDepth,
nullptr);
if (error) {
MOZ_ASSERT(!error);
*out_glError = LOCAL_GL_OUT_OF_MEMORY;
return;
}
}
do {
if (dui->unpackFormat != LOCAL_GL_RGB && dui->unpackFormat != LOCAL_GL_RGBA)
break;
if (dui->unpackType != LOCAL_GL_UNSIGNED_BYTE)
break;
gl::ScopedFramebuffer scopedFB(gl);
gl::ScopedBindFramebuffer bindFB(gl, scopedFB.FB());
{
gl::GLContext::LocalErrorScope errorScope(*gl);
gl->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_COLOR_ATTACHMENT0,
target.get(), tex->mGLName, level);
if (errorScope.GetError())
break;
}
const GLenum status = gl->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE)
break;
gl::OriginPos srcOrigin, dstOrigin;
OriginsForDOM(webgl, &srcOrigin, &dstOrigin);
const gfx::IntSize destSize(mWidth, mHeight);
if (!gl->BlitHelper()->BlitImageToFramebuffer(mImage, destSize, scopedFB.FB(),
dstOrigin))
{
break;
}
return; // Blitting was successful, so we're done!
} while (false);
TexUnpackSurface surfBlob(mImage->GetAsSourceSurface(), mIsAlphaPremult);
surfBlob.TexOrSubImage(isSubImage, needsRespec, funcName, tex, target, level, dui,
xOffset, yOffset, zOffset, out_glError);
}
