gecko-dev/dom/canvas/WebGLContextBuffers.cpp

545 lines
16 KiB
C++

/* -*- 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 "WebGLVertexArray.h"
namespace mozilla {
void
WebGLContext::UpdateBoundBuffer(GLenum target, WebGLBuffer* buffer)
{
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
bufferSlot = buffer;
if (!buffer)
return;
/* https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.1
*
* In the WebGL 2 API, buffers have their WebGL buffer type
* initially set to undefined. Calling bindBuffer, bindBufferRange
* or bindBufferBase with the target argument set to any buffer
* binding point except COPY_READ_BUFFER or COPY_WRITE_BUFFER will
* then set the WebGL buffer type of the buffer being bound
* according to the table above.
*
* Any call to one of these functions which attempts to bind a
* WebGLBuffer that has the element array WebGL buffer type to a
* binding point that falls under other data, or bind a
* WebGLBuffer which has the other data WebGL buffer type to
* ELEMENT_ARRAY_BUFFER will generate an INVALID_OPERATION error,
* and the state of the binding point will remain untouched.
*/
if (target != LOCAL_GL_COPY_READ_BUFFER && target != LOCAL_GL_COPY_WRITE_BUFFER)
buffer->BindTo(target);
}
void
WebGLContext::UpdateBoundBufferIndexed(GLenum target, GLuint index, WebGLBuffer* buffer)
{
UpdateBoundBuffer(target, buffer);
WebGLRefPtr<WebGLBuffer>& bufferIndexSlot =
GetBufferSlotByTargetIndexed(target, index);
bufferIndexSlot = buffer;
}
void
WebGLContext::BindBuffer(GLenum target, WebGLBuffer* buffer)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("bindBuffer", buffer))
return;
// silently ignore a deleted buffer
if (buffer && buffer->IsDeleted())
return;
if (!ValidateBufferTarget(target, "bindBuffer"))
return;
if (!ValidateBufferForTarget(target, buffer, "bindBuffer"))
return;
WebGLContextUnchecked::BindBuffer(target, buffer);
UpdateBoundBuffer(target, buffer);
}
void
WebGLContext::BindBufferBase(GLenum target, GLuint index, WebGLBuffer* buffer)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("bindBufferBase", buffer))
return;
// silently ignore a deleted buffer
if (buffer && buffer->IsDeleted())
return;
// ValidateBufferTarget
switch (target) {
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
if (index >= mGLMaxTransformFeedbackSeparateAttribs)
return ErrorInvalidValue("bindBufferBase: index should be less than "
"MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS");
break;
case LOCAL_GL_UNIFORM_BUFFER:
if (index >= mGLMaxUniformBufferBindings)
return ErrorInvalidValue("bindBufferBase: index should be less than "
"MAX_UNIFORM_BUFFER_BINDINGS");
break;
default:
return ErrorInvalidEnumInfo("bindBufferBase: target", target);
}
if (!ValidateBufferForTarget(target, buffer, "bindBufferBase"))
return;
WebGLContextUnchecked::BindBufferBase(target, index, buffer);
UpdateBoundBufferIndexed(target, index, buffer);
}
void
WebGLContext::BindBufferRange(GLenum target, GLuint index, WebGLBuffer* buffer,
WebGLintptr offset, WebGLsizeiptr size)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("bindBufferRange", buffer))
return;
// silently ignore a deleted buffer
if (buffer && buffer->IsDeleted())
return;
// ValidateBufferTarget
switch (target) {
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
if (index >= mGLMaxTransformFeedbackSeparateAttribs)
return ErrorInvalidValue("bindBufferRange: index should be less than "
"MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS");
break;
case LOCAL_GL_UNIFORM_BUFFER:
if (index >= mGLMaxUniformBufferBindings)
return ErrorInvalidValue("bindBufferRange: index should be less than "
"MAX_UNIFORM_BUFFER_BINDINGS");
break;
default:
return ErrorInvalidEnumInfo("bindBufferRange: target", target);
}
if (!ValidateBufferForTarget(target, buffer, "bindBufferRange"))
return;
WebGLContextUnchecked::BindBufferRange(target, index, buffer, offset, size);
UpdateBoundBufferIndexed(target, index, buffer);
}
void
WebGLContext::BufferData(GLenum target, WebGLsizeiptr size, GLenum usage)
{
if (IsContextLost())
return;
if (!ValidateBufferTarget(target, "bufferData"))
return;
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
if (size < 0)
return ErrorInvalidValue("bufferData: negative size");
if (!ValidateBufferUsageEnum(usage, "bufferData: usage"))
return;
// careful: WebGLsizeiptr is always 64-bit, but GLsizeiptr is like intptr_t.
if (!CheckedInt<GLsizeiptr>(size).isValid())
return ErrorOutOfMemory("bufferData: bad size");
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("bufferData: no buffer bound!");
UniquePtr<uint8_t> zeroBuffer((uint8_t*)calloc(size, 1));
if (!zeroBuffer)
return ErrorOutOfMemory("bufferData: out of memory");
MakeContextCurrent();
InvalidateBufferFetching();
GLenum error = CheckedBufferData(target, size, zeroBuffer.get(), usage);
if (error) {
GenerateWarning("bufferData generated error %s", ErrorName(error));
return;
}
boundBuffer->SetByteLength(size);
if (!boundBuffer->ElementArrayCacheBufferData(nullptr, size)) {
return ErrorOutOfMemory("bufferData: out of memory");
}
}
void
WebGLContext::BufferData(GLenum target,
const dom::Nullable<dom::ArrayBuffer>& maybeData,
GLenum usage)
{
if (IsContextLost())
return;
if (maybeData.IsNull()) {
// see http://www.khronos.org/bugzilla/show_bug.cgi?id=386
return ErrorInvalidValue("bufferData: null object passed");
}
if (!ValidateBufferTarget(target, "bufferData"))
return;
const WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
const dom::ArrayBuffer& data = maybeData.Value();
data.ComputeLengthAndData();
// Careful: data.Length() could conceivably be any uint32_t, but GLsizeiptr
// is like intptr_t.
if (!CheckedInt<GLsizeiptr>(data.Length()).isValid())
return ErrorOutOfMemory("bufferData: bad size");
if (!ValidateBufferUsageEnum(usage, "bufferData: usage"))
return;
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("bufferData: no buffer bound!");
MakeContextCurrent();
InvalidateBufferFetching();
GLenum error = CheckedBufferData(target, data.Length(), data.Data(), usage);
if (error) {
GenerateWarning("bufferData generated error %s", ErrorName(error));
return;
}
boundBuffer->SetByteLength(data.Length());
if (!boundBuffer->ElementArrayCacheBufferData(data.Data(), data.Length()))
return ErrorOutOfMemory("bufferData: out of memory");
}
void
WebGLContext::BufferData(GLenum target, const dom::ArrayBufferView& data,
GLenum usage)
{
if (IsContextLost())
return;
if (!ValidateBufferTarget(target, "bufferData"))
return;
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
if (!ValidateBufferUsageEnum(usage, "bufferData: usage"))
return;
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("bufferData: no buffer bound!");
data.ComputeLengthAndData();
// Careful: data.Length() could conceivably be any uint32_t, but GLsizeiptr
// is like intptr_t.
if (!CheckedInt<GLsizeiptr>(data.Length()).isValid())
return ErrorOutOfMemory("bufferData: bad size");
InvalidateBufferFetching();
MakeContextCurrent();
GLenum error = CheckedBufferData(target, data.Length(), data.Data(), usage);
if (error) {
GenerateWarning("bufferData generated error %s", ErrorName(error));
return;
}
boundBuffer->SetByteLength(data.Length());
if (!boundBuffer->ElementArrayCacheBufferData(data.Data(), data.Length()))
return ErrorOutOfMemory("bufferData: out of memory");
}
void
WebGLContext::BufferSubData(GLenum target, WebGLsizeiptr byteOffset,
const dom::Nullable<dom::ArrayBuffer>& maybeData)
{
if (IsContextLost())
return;
if (maybeData.IsNull()) {
// see http://www.khronos.org/bugzilla/show_bug.cgi?id=386
return;
}
if (!ValidateBufferTarget(target, "bufferSubData"))
return;
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
if (byteOffset < 0)
return ErrorInvalidValue("bufferSubData: negative offset");
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("bufferData: no buffer bound!");
const dom::ArrayBuffer& data = maybeData.Value();
data.ComputeLengthAndData();
CheckedInt<WebGLsizeiptr> checked_neededByteLength =
CheckedInt<WebGLsizeiptr>(byteOffset) + data.Length();
if (!checked_neededByteLength.isValid()) {
ErrorInvalidValue("bufferSubData: Integer overflow computing the needed"
" byte length.");
return;
}
if (checked_neededByteLength.value() > boundBuffer->ByteLength()) {
ErrorInvalidValue("bufferSubData: Not enough data. Operation requires"
" %d bytes, but buffer only has %d bytes.",
checked_neededByteLength.value(),
boundBuffer->ByteLength());
return;
}
boundBuffer->ElementArrayCacheBufferSubData(byteOffset, data.Data(),
data.Length());
MakeContextCurrent();
gl->fBufferSubData(target, byteOffset, data.Length(), data.Data());
}
void
WebGLContext::BufferSubData(GLenum target, WebGLsizeiptr byteOffset,
const dom::ArrayBufferView& data)
{
if (IsContextLost())
return;
if (!ValidateBufferTarget(target, "bufferSubData"))
return;
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
if (byteOffset < 0)
return ErrorInvalidValue("bufferSubData: negative offset");
WebGLBuffer* boundBuffer = bufferSlot.get();
if (!boundBuffer)
return ErrorInvalidOperation("bufferSubData: no buffer bound!");
data.ComputeLengthAndData();
CheckedInt<WebGLsizeiptr> checked_neededByteLength =
CheckedInt<WebGLsizeiptr>(byteOffset) + data.Length();
if (!checked_neededByteLength.isValid()) {
ErrorInvalidValue("bufferSubData: Integer overflow computing the needed"
" byte length.");
return;
}
if (checked_neededByteLength.value() > boundBuffer->ByteLength()) {
ErrorInvalidValue("bufferSubData: Not enough data. Operation requires"
" %d bytes, but buffer only has %d bytes.",
checked_neededByteLength.value(),
boundBuffer->ByteLength());
return;
}
boundBuffer->ElementArrayCacheBufferSubData(byteOffset, data.Data(),
data.Length());
MakeContextCurrent();
gl->fBufferSubData(target, byteOffset, data.Length(), data.Data());
}
already_AddRefed<WebGLBuffer>
WebGLContext::CreateBuffer()
{
if (IsContextLost())
return nullptr;
GLuint buf = 0;
MakeContextCurrent();
gl->fGenBuffers(1, &buf);
nsRefPtr<WebGLBuffer> globj = new WebGLBuffer(this, buf);
return globj.forget();
}
void
WebGLContext::DeleteBuffer(WebGLBuffer* buffer)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("deleteBuffer", buffer))
return;
if (!buffer || buffer->IsDeleted())
return;
if (mBoundArrayBuffer == buffer)
BindBuffer(LOCAL_GL_ARRAY_BUFFER, static_cast<WebGLBuffer*>(nullptr));
if (mBoundVertexArray->mElementArrayBuffer == buffer) {
BindBuffer(LOCAL_GL_ELEMENT_ARRAY_BUFFER,
static_cast<WebGLBuffer*>(nullptr));
}
for (int32_t i = 0; i < mGLMaxVertexAttribs; i++) {
if (mBoundVertexArray->HasAttrib(i) &&
mBoundVertexArray->mAttribs[i].buf == buffer)
{
mBoundVertexArray->mAttribs[i].buf = nullptr;
}
}
buffer->RequestDelete();
}
bool
WebGLContext::IsBuffer(WebGLBuffer* buffer)
{
if (IsContextLost())
return false;
return ValidateObjectAllowDeleted("isBuffer", buffer) &&
!buffer->IsDeleted() &&
buffer->HasEverBeenBound();
}
bool
WebGLContext::ValidateBufferUsageEnum(GLenum target, const char* info)
{
switch (target) {
case LOCAL_GL_STREAM_DRAW:
case LOCAL_GL_STATIC_DRAW:
case LOCAL_GL_DYNAMIC_DRAW:
return true;
default:
break;
}
ErrorInvalidEnumInfo(info, target);
return false;
}
WebGLRefPtr<WebGLBuffer>&
WebGLContext::GetBufferSlotByTarget(GLenum target)
{
/* This function assumes that target has been validated for either
* WebGL1 or WebGL2.
*/
switch (target) {
case LOCAL_GL_ARRAY_BUFFER:
return mBoundArrayBuffer;
case LOCAL_GL_COPY_READ_BUFFER:
return mBoundCopyReadBuffer;
case LOCAL_GL_COPY_WRITE_BUFFER:
return mBoundCopyWriteBuffer;
case LOCAL_GL_ELEMENT_ARRAY_BUFFER:
return mBoundVertexArray->mElementArrayBuffer;
case LOCAL_GL_PIXEL_PACK_BUFFER:
return mBoundPixelPackBuffer;
case LOCAL_GL_PIXEL_UNPACK_BUFFER:
return mBoundPixelUnpackBuffer;
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
return mBoundTransformFeedbackBuffer;
case LOCAL_GL_UNIFORM_BUFFER:
return mBoundUniformBuffer;
default:
MOZ_CRASH("Should not get here.");
}
}
WebGLRefPtr<WebGLBuffer>&
WebGLContext::GetBufferSlotByTargetIndexed(GLenum target, GLuint index)
{
/* This function assumes that target has been validated for either WebGL1 or WebGL. */
switch (target) {
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
MOZ_ASSERT(index < mGLMaxTransformFeedbackSeparateAttribs);
return mBoundTransformFeedbackBuffers[index];
case LOCAL_GL_UNIFORM_BUFFER:
MOZ_ASSERT(index < mGLMaxUniformBufferBindings);
return mBoundUniformBuffers[index];
default:
MOZ_CRASH("Should not get here.");
}
}
GLenum
WebGLContext::CheckedBufferData(GLenum target, GLsizeiptr size,
const GLvoid* data, GLenum usage)
{
#ifdef XP_MACOSX
// bug 790879
if (gl->WorkAroundDriverBugs() &&
int64_t(size) > INT32_MAX) // cast avoids a potential always-true warning on 32bit
{
GenerateWarning("Rejecting valid bufferData call with size %lu to avoid"
" a Mac bug", size);
return LOCAL_GL_INVALID_VALUE;
}
#endif
WebGLRefPtr<WebGLBuffer>& bufferSlot = GetBufferSlotByTarget(target);
WebGLBuffer* boundBuffer = bufferSlot.get();
MOZ_ASSERT(boundBuffer, "No buffer bound for this target.");
bool sizeChanges = uint32_t(size) != boundBuffer->ByteLength();
if (sizeChanges) {
GetAndFlushUnderlyingGLErrors();
gl->fBufferData(target, size, data, usage);
GLenum error = GetAndFlushUnderlyingGLErrors();
return error;
} else {
gl->fBufferData(target, size, data, usage);
return LOCAL_GL_NO_ERROR;
}
}
} // namespace mozilla