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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 "WebGLTransformFeedback.h"
#include "GLContext.h"
#include "mozilla/dom/WebGL2RenderingContextBinding.h"
#include "mozilla/IntegerRange.h"
#include "WebGL2Context.h"
#include "WebGLBuffer.h"
#include "WebGLProgram.h"
namespace mozilla {
WebGLTransformFeedback::WebGLTransformFeedback(WebGLContext* webgl, GLuint tf)
: WebGLContextBoundObject(webgl),
mGLName(tf),
mIndexedBindings(webgl::kMaxTransformFeedbackSeparateAttribs),
mIsPaused(false),
mIsActive(false) {}
WebGLTransformFeedback::~WebGLTransformFeedback() {
if (!mContext) return;
if (mGLName) {
mContext->gl->fDeleteTransformFeedbacks(1, &mGLName);
}
}
////////////////////////////////////////
void WebGLTransformFeedback::BeginTransformFeedback(GLenum primMode) {
if (mIsActive) return mContext->ErrorInvalidOperation("Already active.");
switch (primMode) {
case LOCAL_GL_POINTS:
case LOCAL_GL_LINES:
case LOCAL_GL_TRIANGLES:
break;
default:
mContext->ErrorInvalidEnum(
"`primitiveMode` must be one of POINTS, LINES, or"
" TRIANGLES.");
return;
}
const auto& prog = mContext->mCurrentProgram;
if (!prog || !prog->IsLinked() ||
prog->LinkInfo()->componentsPerTFVert.empty()) {
mContext->ErrorInvalidOperation(
"Current program not valid for transform"
" feedback.");
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(
"No buffer attached to required transform"
" feedback index %u.",
(uint32_t)i);
return;
}
for (const auto iBound : IntegerRange(mIndexedBindings.size())) {
const auto& bound = mIndexedBindings[iBound].mBufferBinding.get();
if (iBound != i && buffer == bound) {
mContext->GenErrorIllegalUse(
LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<uint32_t>(i),
LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER, static_cast<uint32_t>(iBound));
return;
}
}
const size_t vertCapacity = buffer->ByteLength() / 4 / componentsPerVert;
minVertCapacity = std::min(minVertCapacity, vertCapacity);
}
////
const auto& gl = mContext->gl;
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() {
if (!mIsActive) return mContext->ErrorInvalidOperation("Not active.");
////
const auto& gl = mContext->gl;
gl->fEndTransformFeedback();
if (gl->WorkAroundDriverBugs()) {
#ifdef XP_MACOSX
// Multi-threaded GL on mac will generate INVALID_OP in some cases for at
// least BindBufferBase after an EndTransformFeedback if there is not a
// flush between the two. Single-threaded GL does not have this issue. This
// is likely due to not synchronizing client/server state, and erroring in
// BindBufferBase because the client thinks we're still in transform
// feedback.
gl->fFlush();
#endif
}
////
mIsActive = false;
mIsPaused = false;
////
mActive_Program->mNumActiveTFOs--;
}
void WebGLTransformFeedback::PauseTransformFeedback() {
if (!mIsActive || mIsPaused) {
mContext->ErrorInvalidOperation("Not active or is paused.");
return;
}
////
const auto& gl = mContext->gl;
gl->fPauseTransformFeedback();
////
mIsPaused = true;
}
void WebGLTransformFeedback::ResumeTransformFeedback() {
if (!mIsPaused) return mContext->ErrorInvalidOperation("Not paused.");
if (mContext->mCurrentProgram != mActive_Program) {
mContext->ErrorInvalidOperation("Active program differs from original.");
return;
}
////
const auto& gl = mContext->gl;
gl->fResumeTransformFeedback();
////
MOZ_ASSERT(mIsActive);
mIsPaused = false;
}
} // namespace mozilla
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