void
WebGL2Context::CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
GLintptr readOffset, GLintptr writeOffset,
GLsizeiptr size)
{
if (IsContextLost())
return;
if (!ValidateBufferTarget(readTarget, "copyBufferSubData") ||
!ValidateBufferTarget(writeTarget, "copyBufferSubData"))
{
return;
}
const WebGLRefPtr<WebGLBuffer>& readBufferSlot = GetBufferSlotByTarget(readTarget);
const WebGLRefPtr<WebGLBuffer>& writeBufferSlot = GetBufferSlotByTarget(writeTarget);
if (!readBufferSlot || !writeBufferSlot)
return;
const WebGLBuffer* readBuffer = readBufferSlot.get();
if (!readBuffer)
return ErrorInvalidOperation("copyBufferSubData: No buffer bound to readTarget");
WebGLBuffer* writeBuffer = writeBufferSlot.get();
if (!writeBuffer)
return ErrorInvalidOperation("copyBufferSubData: No buffer bound to writeTarget");
if (!ValidateDataOffsetSize(readOffset, size, readBuffer->ByteLength(),
"copyBufferSubData"))
{
return;
}
if (!ValidateDataOffsetSize(writeOffset, size, writeBuffer->ByteLength(),
"copyBufferSubData"))
{
return;
}
if (readTarget == writeTarget &&
!ValidateDataRanges(readOffset, writeOffset, size, "copyBufferSubData"))
{
return;
}
WebGLBuffer::Kind readType = readBuffer->Content();
WebGLBuffer::Kind writeType = writeBuffer->Content();
if (readType != WebGLBuffer::Kind::Undefined &&
writeType != WebGLBuffer::Kind::Undefined &&
writeType != readType)
{
ErrorInvalidOperation("copyBufferSubData: Can't copy %s data to %s data",
(readType == WebGLBuffer::Kind::OtherData) ? "other" : "element",
(writeType == WebGLBuffer::Kind::OtherData) ? "other" : "element");
return;
}
WebGLContextUnchecked::CopyBufferSubData(readTarget, writeTarget, readOffset,
writeOffset, size);
if (writeType == WebGLBuffer::Kind::Undefined) {
writeBuffer->BindTo(
(readType == WebGLBuffer::Kind::OtherData) ? LOCAL_GL_ARRAY_BUFFER
: LOCAL_GL_ELEMENT_ARRAY_BUFFER);
}
}
void
WebGL2Context::CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
GLintptr readOffset, GLintptr writeOffset,
GLsizeiptr size)
{
const char funcName[] = "copyBufferSubData";
if (IsContextLost())
return;
const auto& readBuffer = ValidateBufferSelection(funcName, readTarget);
if (!readBuffer)
return;
const auto& writeBuffer = ValidateBufferSelection(funcName, writeTarget);
if (!writeBuffer)
return;
if (readBuffer->mNumActiveTFOs ||
writeBuffer->mNumActiveTFOs)
{
ErrorInvalidOperation("%s: Buffer is bound to an active transform feedback"
" object.",
funcName);
return;
}
if (!ValidateNonNegative(funcName, "readOffset", readOffset) ||
!ValidateNonNegative(funcName, "writeOffset", writeOffset) ||
!ValidateNonNegative(funcName, "size", size))
{
return;
}
const auto fnValidateOffsetSize = [&](const char* info, GLintptr offset,
const WebGLBuffer* buffer)
{
const auto neededBytes = CheckedInt<size_t>(offset) + size;
if (!neededBytes.isValid() || neededBytes.value() > buffer->ByteLength()) {
ErrorInvalidValue("%s: Invalid %s range.", funcName, info);
return false;
}
return true;
};
if (!fnValidateOffsetSize("read", readOffset, readBuffer) ||
!fnValidateOffsetSize("write", writeOffset, writeBuffer))
{
return;
}
if (readBuffer == writeBuffer &&
!ValidateDataRanges(readOffset, writeOffset, size, funcName))
{
return;
}
const auto& readType = readBuffer->Content();
const auto& writeType = writeBuffer->Content();
MOZ_ASSERT(readType != WebGLBuffer::Kind::Undefined);
MOZ_ASSERT(writeType != WebGLBuffer::Kind::Undefined);
if (writeType != readType) {
ErrorInvalidOperation("%s: Can't copy %s data to %s data.",
funcName,
(readType == WebGLBuffer::Kind::OtherData) ? "other"
: "element",
(writeType == WebGLBuffer::Kind::OtherData) ? "other"
: "element");
return;
}
gl->MakeCurrent();
gl->fCopyBufferSubData(readTarget, writeTarget, readOffset, writeOffset, size);
}