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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGL2Context.h"
#include "ClientWebGLContext.h"
#include "GLContext.h"
#include "WebGLBuffer.h"
#include "WebGLTransformFeedback.h"
namespace mozilla {
// -------------------------------------------------------------------------
// Buffer objects
void WebGL2Context::CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
uint64_t readOffset, uint64_t writeOffset,
uint64_t size) const {
const FuncScope funcScope(*this, "copyBufferSubData");
if (IsContextLost()) return;
const auto& readBuffer = ValidateBufferSelection(readTarget);
if (!readBuffer) return;
const auto& writeBuffer = ValidateBufferSelection(writeTarget);
if (!writeBuffer) return;
if (!CheckedInt<GLintptr>(readOffset).isValid() ||
!CheckedInt<GLintptr>(writeOffset).isValid() ||
!CheckedInt<GLsizeiptr>(size).isValid())
return ErrorOutOfMemory("offset or size too large for platform.");
const auto fnValidateOffsetSize = [&](const char* info, WebGLintptr offset,
const WebGLBuffer* buffer) {
const auto neededBytes = CheckedInt<uint64_t>(offset) + size;
if (!neededBytes.isValid() || neededBytes.value() > buffer->ByteLength()) {
ErrorInvalidValue("Invalid %s range.", info);
return false;
}
return true;
};
if (!fnValidateOffsetSize("read", readOffset, readBuffer) ||
!fnValidateOffsetSize("write", writeOffset, writeBuffer)) {
return;
}
if (readBuffer == writeBuffer) {
const bool separate =
(readOffset + size <= writeOffset || writeOffset + size <= readOffset);
if (!separate) {
ErrorInvalidValue(
"Ranges [readOffset, readOffset + size) and"
" [writeOffset, writeOffset + size) overlap.");
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(
"Can't copy %s data to %s data.",
(readType == WebGLBuffer::Kind::OtherData) ? "other" : "element",
(writeType == WebGLBuffer::Kind::OtherData) ? "other" : "element");
return;
}
const ScopedLazyBind readBind(gl, readTarget, readBuffer);
const ScopedLazyBind writeBind(gl, writeTarget, writeBuffer);
gl->fCopyBufferSubData(readTarget, writeTarget, readOffset, writeOffset,
size);
writeBuffer->ResetLastUpdateFenceId();
}
bool WebGL2Context::GetBufferSubData(GLenum target, uint64_t srcByteOffset,
const Range<uint8_t>& dest) const {
const FuncScope funcScope(*this, "getBufferSubData");
if (IsContextLost()) return false;
const auto& buffer = ValidateBufferSelection(target);
if (!buffer) return false;
const auto byteLen = dest.length();
if (!buffer->ValidateRange(srcByteOffset, byteLen)) return false;
////
if (!CheckedInt<GLintptr>(srcByteOffset).isValid() ||
!CheckedInt<GLsizeiptr>(byteLen).isValid()) {
ErrorOutOfMemory("offset or size too large for platform.");
return false;
}
const GLsizeiptr glByteLen(byteLen);
////
switch (buffer->mUsage) {
case LOCAL_GL_STATIC_READ:
case LOCAL_GL_STREAM_READ:
case LOCAL_GL_DYNAMIC_READ:
if (mCompletedFenceId < buffer->mLastUpdateFenceId) {
GenerateWarning(
"Reading from a buffer without checking for previous"
" command completion likely causes pipeline stalls."
" Please use FenceSync.");
}
break;
default:
GenerateWarning(
"Reading from a buffer with usage other than *_READ"
" causes pipeline stalls. Copy through a STREAM_READ buffer.");
break;
}
////
const ScopedLazyBind readBind(gl, target, buffer);
if (byteLen) {
const bool isTF = (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER);
GLenum mapTarget = target;
if (isTF) {
gl->fBindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, mEmptyTFO);
gl->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, buffer->mGLName);
mapTarget = LOCAL_GL_ARRAY_BUFFER;
}
const auto mappedBytes = gl->fMapBufferRange(
mapTarget, srcByteOffset, glByteLen, LOCAL_GL_MAP_READ_BIT);
memcpy(dest.begin().get(), mappedBytes, dest.length());
gl->fUnmapBuffer(mapTarget);
if (isTF) {
const GLuint vbo = (mBoundArrayBuffer ? mBoundArrayBuffer->mGLName : 0);
gl->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, vbo);
const GLuint tfo =
(mBoundTransformFeedback ? mBoundTransformFeedback->mGLName : 0);
gl->fBindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, tfo);
}
}
return true;
}
} // namespace mozilla
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