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Mypal/dom/canvas/WebGLContextBuffers.cpp

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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 "WebGLContext.h"
#include "GLContext.h"
#include "WebGLBuffer.h"
#include "WebGLTransformFeedback.h"
#include "WebGLVertexArray.h"
#include "mozilla/CheckedInt.h"
namespace mozilla {
WebGLRefPtr<WebGLBuffer>*
WebGLContext::ValidateBufferSlot(const char* funcName, GLenum target)
{
WebGLRefPtr<WebGLBuffer>* slot = nullptr;
switch (target) {
case LOCAL_GL_ARRAY_BUFFER:
slot = &mBoundArrayBuffer;
break;
case LOCAL_GL_ELEMENT_ARRAY_BUFFER:
slot = &(mBoundVertexArray->mElementArrayBuffer);
break;
}
if (IsWebGL2()) {
switch (target) {
case LOCAL_GL_COPY_READ_BUFFER:
slot = &mBoundCopyReadBuffer;
break;
case LOCAL_GL_COPY_WRITE_BUFFER:
slot = &mBoundCopyWriteBuffer;
break;
case LOCAL_GL_PIXEL_PACK_BUFFER:
slot = &mBoundPixelPackBuffer;
break;
case LOCAL_GL_PIXEL_UNPACK_BUFFER:
slot = &mBoundPixelUnpackBuffer;
break;
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
slot = &(mBoundTransformFeedback->mGenericBufferBinding);
break;
case LOCAL_GL_UNIFORM_BUFFER:
slot = &mBoundUniformBuffer;
break;
}
}
if (!slot) {
ErrorInvalidEnum("%s: Bad `target`: 0x%04x", funcName, target);
return nullptr;
}
return slot;
}
WebGLBuffer*
WebGLContext::ValidateBufferSelection(const char* funcName, GLenum target)
{
const auto& slot = ValidateBufferSlot(funcName, target);
if (!slot)
return nullptr;
const auto& buffer = *slot;
if (!buffer) {
ErrorInvalidOperation("%s: Buffer for `target` is null.", funcName);
return nullptr;
}
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER) {
if (mBoundTransformFeedback->IsActiveAndNotPaused()) {
ErrorInvalidOperation("%s: Cannot select TRANSFORM_FEEDBACK_BUFFER when"
" transform feedback is active and unpaused.",
funcName);
return nullptr;
}
if (buffer->IsBoundForNonTF()) {
ErrorInvalidOperation("%s: Specified WebGLBuffer is currently bound for"
" non-transform-feedback.",
funcName);
return nullptr;
}
} else {
if (buffer->IsBoundForTF()) {
ErrorInvalidOperation("%s: Specified WebGLBuffer is currently bound for"
" transform feedback.",
funcName);
return nullptr;
}
}
return buffer.get();
}
IndexedBufferBinding*
WebGLContext::ValidateIndexedBufferSlot(const char* funcName, GLenum target, GLuint index)
{
decltype(mIndexedUniformBufferBindings)* bindings;
const char* maxIndexEnum;
switch (target) {
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
bindings = &(mBoundTransformFeedback->mIndexedBindings);
maxIndexEnum = "MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS";
break;
case LOCAL_GL_UNIFORM_BUFFER:
bindings = &mIndexedUniformBufferBindings;
maxIndexEnum = "MAX_UNIFORM_BUFFER_BINDINGS";
break;
default:
ErrorInvalidEnum("%s: Bad `target`: 0x%04x", funcName, target);
return nullptr;
}
if (index >= bindings->size()) {
ErrorInvalidValue("%s: `index` >= %s.", funcName, maxIndexEnum);
return nullptr;
}
return &(*bindings)[index];
}
////////////////////////////////////////
void
WebGLContext::BindBuffer(GLenum target, WebGLBuffer* buffer)
{
const char funcName[] = "bindBuffer";
if (IsContextLost())
return;
if (buffer && !ValidateObject(funcName, *buffer))
return;
const auto& slot = ValidateBufferSlot(funcName, target);
if (!slot)
return;
if (buffer && !buffer->ValidateCanBindToTarget(funcName, target))
return;
gl->MakeCurrent();
gl->fBindBuffer(target, buffer ? buffer->mGLName : 0);
WebGLBuffer::SetSlot(target, buffer, slot);
if (buffer) {
buffer->SetContentAfterBind(target);
}
switch (target) {
case LOCAL_GL_PIXEL_PACK_BUFFER:
case LOCAL_GL_PIXEL_UNPACK_BUFFER:
gl->fBindBuffer(target, 0);
break;
}
}
////////////////////////////////////////
bool
WebGLContext::ValidateIndexedBufferBinding(const char* funcName, GLenum target,
GLuint index,
WebGLRefPtr<WebGLBuffer>** const out_genericBinding,
IndexedBufferBinding** const out_indexedBinding)
{
*out_genericBinding = ValidateBufferSlot(funcName, target);
if (!*out_genericBinding)
return false;
*out_indexedBinding = ValidateIndexedBufferSlot(funcName, target, index);
if (!*out_indexedBinding)
return false;
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER &&
mBoundTransformFeedback->mIsActive)
{
ErrorInvalidOperation("%s: Cannot update indexed buffer bindings on active"
" transform feedback objects.",
funcName);
return false;
}
return true;
}
void
WebGLContext::BindBufferBase(GLenum target, GLuint index, WebGLBuffer* buffer)
{
const char funcName[] = "bindBufferBase";
if (IsContextLost())
return;
if (buffer && !ValidateObject(funcName, *buffer))
return;
WebGLRefPtr<WebGLBuffer>* genericBinding;
IndexedBufferBinding* indexedBinding;
if (!ValidateIndexedBufferBinding(funcName, target, index, &genericBinding,
&indexedBinding))
{
return;
}
if (buffer && !buffer->ValidateCanBindToTarget(funcName, target))
return;
////
gl->MakeCurrent();
gl->fBindBufferBase(target, index, buffer ? buffer->mGLName : 0);
////
WebGLBuffer::SetSlot(target, buffer, genericBinding);
WebGLBuffer::SetSlot(target, buffer, &indexedBinding->mBufferBinding);
indexedBinding->mRangeStart = 0;
indexedBinding->mRangeSize = 0;
if (buffer) {
buffer->SetContentAfterBind(target);
}
}
void
WebGLContext::BindBufferRange(GLenum target, GLuint index, WebGLBuffer* buffer,
WebGLintptr offset, WebGLsizeiptr size)
{
const char funcName[] = "bindBufferRange";
if (IsContextLost())
return;
if (buffer && !ValidateObject(funcName, *buffer))
return;
if (!ValidateNonNegative(funcName, "offset", offset) ||
!ValidateNonNegative(funcName, "size", size))
{
return;
}
WebGLRefPtr<WebGLBuffer>* genericBinding;
IndexedBufferBinding* indexedBinding;
if (!ValidateIndexedBufferBinding(funcName, target, index, &genericBinding,
&indexedBinding))
{
return;
}
if (buffer && !buffer->ValidateCanBindToTarget(funcName, target))
return;
if (buffer && !size) {
ErrorInvalidValue("%s: size must be non-zero for non-null buffer.", funcName);
return;
}
////
gl->MakeCurrent();
switch (target) {
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
if (offset % 4 != 0 || size % 4 != 0) {
ErrorInvalidValue("%s: For %s, `offset` and `size` must be multiples of 4.",
funcName, "TRANSFORM_FEEDBACK_BUFFER");
return;
}
break;
case LOCAL_GL_UNIFORM_BUFFER:
{
GLuint offsetAlignment = 0;
gl->GetUIntegerv(LOCAL_GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &offsetAlignment);
if (offset % offsetAlignment != 0) {
ErrorInvalidValue("%s: For %s, `offset` must be a multiple of %s.",
funcName, "UNIFORM_BUFFER",
"UNIFORM_BUFFER_OFFSET_ALIGNMENT");
return;
}
}
break;
}
////
#ifdef XP_MACOSX
if (buffer && buffer->Content() == WebGLBuffer::Kind::Undefined &&
gl->WorkAroundDriverBugs())
{
// BindBufferRange will fail if the buffer's contents is undefined.
// Bind so driver initializes the buffer.
gl->fBindBuffer(target, buffer->mGLName);
}
#endif
gl->fBindBufferRange(target, index, buffer ? buffer->mGLName : 0, offset, size);
////
WebGLBuffer::SetSlot(target, buffer, genericBinding);
WebGLBuffer::SetSlot(target, buffer, &indexedBinding->mBufferBinding);
indexedBinding->mRangeStart = offset;
indexedBinding->mRangeSize = size;
if (buffer) {
buffer->SetContentAfterBind(target);
}
}
////////////////////////////////////////
void
WebGLContext::BufferDataImpl(GLenum target, size_t dataLen, const uint8_t* data,
GLenum usage)
{
const char funcName[] = "bufferData";
const auto& buffer = ValidateBufferSelection(funcName, target);
if (!buffer)
return;
buffer->BufferData(target, dataLen, data, usage);
}
////
void
WebGLContext::BufferData(GLenum target, WebGLsizeiptr size, GLenum usage)
{
const char funcName[] = "bufferData";
if (IsContextLost())
return;
if (!ValidateNonNegative(funcName, "size", size))
return;
////
const auto checkedSize = CheckedInt<size_t>(size);
if (!checkedSize.isValid())
return ErrorOutOfMemory("%s: Size too large for platform.", funcName);
#if defined(XP_MACOSX)
if (gl->WorkAroundDriverBugs() && size > 1200000000) {
return ErrorOutOfMemory("Allocations larger than 1200000000 fail on MacOS.");
}
#endif
const UniqueBuffer zeroBuffer(calloc(size, 1));
if (!zeroBuffer)
return ErrorOutOfMemory("%s: Failed to allocate zeros.", funcName);
BufferDataImpl(target, size_t(size), (const uint8_t*)zeroBuffer.get(), usage);
}
void
WebGLContext::BufferData(GLenum target, const dom::Nullable<dom::ArrayBuffer>& maybeSrc,
GLenum usage)
{
if (IsContextLost())
return;
if (!ValidateNonNull("bufferData", maybeSrc))
return;
const auto& src = maybeSrc.Value();
src.ComputeLengthAndData();
BufferDataImpl(target, src.LengthAllowShared(), src.DataAllowShared(), usage);
}
void
WebGLContext::BufferData(GLenum target, const dom::ArrayBufferView& src, GLenum usage,
GLuint srcElemOffset, GLuint srcElemCountOverride)
{
const char funcName[] = "bufferData";
if (IsContextLost())
return;
uint8_t* bytes;
size_t byteLen;
if (!ValidateArrayBufferView(funcName, src, srcElemOffset, srcElemCountOverride,
&bytes, &byteLen))
{
return;
}
BufferDataImpl(target, byteLen, bytes, usage);
}
////////////////////////////////////////
void
WebGLContext::BufferSubDataImpl(GLenum target, WebGLsizeiptr dstByteOffset,
size_t dataLen, const uint8_t* data)
{
const char funcName[] = "bufferSubData";
if (!ValidateNonNegative(funcName, "byteOffset", dstByteOffset))
return;
const auto& buffer = ValidateBufferSelection(funcName, target);
if (!buffer)
return;
if (!buffer->ValidateRange(funcName, dstByteOffset, dataLen))
return;
if (!CheckedInt<GLintptr>(dataLen).isValid()) {
ErrorOutOfMemory("%s: Size too large.", funcName);
return;
}
const GLintptr glDataLen(dataLen);
////
MakeContextCurrent();
const ScopedLazyBind lazyBind(gl, target, buffer);
// Warning: Possibly shared memory. See bug 1225033.
gl->fBufferSubData(target, dstByteOffset, glDataLen, data);
// Warning: Possibly shared memory. See bug 1225033.
buffer->ElementArrayCacheBufferSubData(dstByteOffset, data, size_t(glDataLen));
}
void
WebGLContext::BufferSubData(GLenum target, WebGLsizeiptr dstByteOffset,
const dom::ArrayBuffer& src)
{
if (IsContextLost())
return;
src.ComputeLengthAndData();
BufferSubDataImpl(target, dstByteOffset, src.LengthAllowShared(),
src.DataAllowShared());
}
void
WebGLContext::BufferSubData(GLenum target, WebGLsizeiptr dstByteOffset,
const dom::ArrayBufferView& src, GLuint srcElemOffset,
GLuint srcElemCountOverride)
{
const char funcName[] = "bufferSubData";
if (IsContextLost())
return;
uint8_t* bytes;
size_t byteLen;
if (!ValidateArrayBufferView(funcName, src, srcElemOffset, srcElemCountOverride,
&bytes, &byteLen))
{
return;
}
BufferSubDataImpl(target, dstByteOffset, byteLen, bytes);
}
////////////////////////////////////////
already_AddRefed<WebGLBuffer>
WebGLContext::CreateBuffer()
{
if (IsContextLost())
return nullptr;
GLuint buf = 0;
MakeContextCurrent();
gl->fGenBuffers(1, &buf);
RefPtr<WebGLBuffer> globj = new WebGLBuffer(this, buf);
return globj.forget();
}
void
WebGLContext::DeleteBuffer(WebGLBuffer* buffer)
{
if (!ValidateDeleteObject("deleteBuffer", buffer))
return;
////
const auto fnClearIfBuffer = [&](GLenum target, WebGLRefPtr<WebGLBuffer>& bindPoint) {
if (bindPoint == buffer) {
WebGLBuffer::SetSlot(target, nullptr, &bindPoint);
}
};
fnClearIfBuffer(0, mBoundArrayBuffer);
fnClearIfBuffer(0, mBoundVertexArray->mElementArrayBuffer);
for (auto& cur : mBoundVertexArray->mAttribs) {
fnClearIfBuffer(0, cur.mBuf);
}
// WebGL binding points
if (IsWebGL2()) {
fnClearIfBuffer(0, mBoundCopyReadBuffer);
fnClearIfBuffer(0, mBoundCopyWriteBuffer);
fnClearIfBuffer(0, mBoundPixelPackBuffer);
fnClearIfBuffer(0, mBoundPixelUnpackBuffer);
fnClearIfBuffer(0, mBoundUniformBuffer);
fnClearIfBuffer(LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER,
mBoundTransformFeedback->mGenericBufferBinding);
if (!mBoundTransformFeedback->mIsActive) {
for (auto& binding : mBoundTransformFeedback->mIndexedBindings) {
fnClearIfBuffer(LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER,
binding.mBufferBinding);
}
}
for (auto& binding : mIndexedUniformBufferBindings) {
fnClearIfBuffer(0, binding.mBufferBinding);
}
}
////
buffer->RequestDelete();
}
bool
WebGLContext::IsBuffer(WebGLBuffer* buffer)
{
if (!ValidateIsObject("isBuffer", buffer))
return false;
MakeContextCurrent();
return gl->fIsBuffer(buffer->mGLName);
}
} // namespace mozilla
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