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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "GLContext.h"
#include "WebGLBuffer.h"
#include "WebGLTransformFeedback.h"
namespace mozilla {
// -------------------------------------------------------------------------
// Buffer objects
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 (!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) {
MOZ_ASSERT((CheckedInt<WebGLsizeiptr>(readOffset) + size).isValid());
MOZ_ASSERT((CheckedInt<WebGLsizeiptr>(writeOffset) + size).isValid());
const bool separate = (readOffset + size <= writeOffset ||
writeOffset + size <= readOffset);
if (!separate) {
ErrorInvalidValue("%s: ranges [readOffset, readOffset + size) and"
" [writeOffset, writeOffset + size) overlap",
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();
const ScopedLazyBind readBind(gl, readTarget, readBuffer);
const ScopedLazyBind writeBind(gl, writeTarget, writeBuffer);
gl->fCopyBufferSubData(readTarget, writeTarget, readOffset, writeOffset, size);
}
void
WebGL2Context::GetBufferSubData(GLenum target, GLintptr srcByteOffset,
const dom::ArrayBufferView& dstData, GLuint dstElemOffset,
GLuint dstElemCountOverride)
{
const char funcName[] = "getBufferSubData";
if (IsContextLost())
return;
if (!ValidateNonNegative(funcName, "srcByteOffset", srcByteOffset))
return;
uint8_t* bytes;
size_t byteLen;
if (!ValidateArrayBufferView(funcName, dstData, dstElemOffset, dstElemCountOverride,
&bytes, &byteLen))
{
return;
}
////
const auto& buffer = ValidateBufferSelection(funcName, target);
if (!buffer)
return;
if (!buffer->ValidateRange(funcName, srcByteOffset, byteLen))
return;
////
if (!CheckedInt<GLsizeiptr>(byteLen).isValid()) {
ErrorOutOfMemory("%s: Size too large.", funcName);
return;
}
const GLsizeiptr glByteLen(byteLen);
////
gl->MakeCurrent();
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(bytes, mappedBytes, byteLen);
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);
}
}
}
} // namespace mozilla
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