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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 "WebGLTransformFeedback.h"
#include "GLContext.h"
#include "mozilla/dom/WebGL2RenderingContextBinding.h"
#include "WebGL2Context.h"
namespace mozilla {
WebGLTransformFeedback::WebGLTransformFeedback(WebGLContext* webgl, GLuint tf)
: WebGLRefCountedObject(webgl)
, mGLName(tf)
, mIndexedBindings(webgl->mGLMaxTransformFeedbackSeparateAttribs)
, mIsPaused(false)
, mIsActive(false)
{
mContext->mTransformFeedbacks.insertBack(this);
}
WebGLTransformFeedback::~WebGLTransformFeedback()
{
DeleteOnce();
}
void
WebGLTransformFeedback::Delete()
{
if (mGLName) {
mContext->MakeContextCurrent();
mContext->gl->fDeleteTransformFeedbacks(1, &mGLName);
}
removeFrom(mContext->mTransformFeedbacks);
}
////////////////////////////////////////
void
WebGLTransformFeedback::BeginTransformFeedback(GLenum primMode)
{
const char funcName[] = "beginTransformFeedback";
if (mIsActive)
return mContext->ErrorInvalidOperation("%s: Already active.", funcName);
switch (primMode) {
case LOCAL_GL_POINTS:
case LOCAL_GL_LINES:
case LOCAL_GL_TRIANGLES:
break;
default:
mContext->ErrorInvalidEnum("%s: `primitiveMode` must be one of POINTS, LINES, or"
" TRIANGLES.",
funcName);
return;
}
const auto& prog = mContext->mCurrentProgram;
if (!prog ||
!prog->IsLinked() ||
!prog->LinkInfo()->componentsPerTFVert.size())
{
mContext->ErrorInvalidOperation("%s: Current program not valid for transform"
" feedback.",
funcName);
return;
}
const auto& linkInfo = prog->LinkInfo();
const auto& componentsPerTFVert = linkInfo->componentsPerTFVert;
size_t minVertCapacity = SIZE_MAX;
for (size_t i = 0; i < componentsPerTFVert.size(); i++) {
const auto& indexedBinding = mIndexedBindings[i];
const auto& componentsPerVert = componentsPerTFVert[i];
const auto& buffer = indexedBinding.mBufferBinding;
if (!buffer) {
mContext->ErrorInvalidOperation("%s: No buffer attached to required transform"
" feedback index %u.",
funcName, (uint32_t)i);
return;
}
const size_t vertCapacity = buffer->ByteLength() / 4 / componentsPerVert;
minVertCapacity = std::min(minVertCapacity, vertCapacity);
}
////
const auto& gl = mContext->gl;
gl->MakeCurrent();
gl->fBeginTransformFeedback(primMode);
////
mIsActive = true;
MOZ_ASSERT(!mIsPaused);
mActive_Program = prog;
mActive_PrimMode = primMode;
mActive_VertPosition = 0;
mActive_VertCapacity = minVertCapacity;
////
mActive_Program->mNumActiveTFOs++;
}
void
WebGLTransformFeedback::EndTransformFeedback()
{
const char funcName[] = "endTransformFeedback";
if (!mIsActive)
return mContext->ErrorInvalidOperation("%s: Not active.", funcName);
////
const auto& gl = mContext->gl;
gl->MakeCurrent();
gl->fEndTransformFeedback();
////
mIsActive = false;
mIsPaused = false;
////
mActive_Program->mNumActiveTFOs--;
}
void
WebGLTransformFeedback::PauseTransformFeedback()
{
const char funcName[] = "pauseTransformFeedback";
if (!mIsActive ||
mIsPaused)
{
mContext->ErrorInvalidOperation("%s: Not active or is paused.", funcName);
return;
}
////
const auto& gl = mContext->gl;
gl->MakeCurrent();
gl->fPauseTransformFeedback();
////
mIsPaused = true;
}
void
WebGLTransformFeedback::ResumeTransformFeedback()
{
const char funcName[] = "resumeTransformFeedback";
if (!mIsPaused)
return mContext->ErrorInvalidOperation("%s: Not paused.", funcName);
if (mContext->mCurrentProgram != mActive_Program) {
mContext->ErrorInvalidOperation("%s: Active program differs from original.",
funcName);
return;
}
////
const auto& gl = mContext->gl;
gl->MakeCurrent();
gl->fResumeTransformFeedback();
////
MOZ_ASSERT(mIsActive);
mIsPaused = false;
}
////////////////////////////////////////
void
WebGLTransformFeedback::AddBufferBindCounts(int8_t addVal) const
{
const GLenum target = LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER;
WebGLBuffer::AddBindCount(target, mGenericBufferBinding.get(), addVal);
for (const auto& binding : mIndexedBindings) {
WebGLBuffer::AddBindCount(target, binding.mBufferBinding.get(), addVal);
}
}
////////////////////////////////////////
JSObject*
WebGLTransformFeedback::WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto)
{
return dom::WebGLTransformFeedbackBinding::Wrap(cx, this, givenProto);
}
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLTransformFeedback, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLTransformFeedback, Release)
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(WebGLTransformFeedback,
mGenericBufferBinding,
mIndexedBindings,
mActive_Program)
} // namespace mozilla
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