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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webgl/webgl_transform_feedback.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/blink/renderer/modules/webgl/webgl_buffer.h"
#include "third_party/blink/renderer/modules/webgl/webgl_context_object_support.h"
#include "third_party/blink/renderer/modules/webgl/webgl_program.h"
namespace blink {
WebGLTransformFeedback::WebGLTransformFeedback(
WebGLContextObjectSupport* ctx,
TFType type,
GLint max_transform_feedback_separate_attribs)
: WebGLObject(ctx),
type_(type),
target_(0),
program_(nullptr),
active_(false),
paused_(false) {
if (ctx->IsLost()) {
return;
}
DCHECK_GE(max_transform_feedback_separate_attribs, 0);
bound_indexed_transform_feedback_buffers_.resize(
max_transform_feedback_separate_attribs);
switch (type_) {
case TFType::kDefault:
break;
case TFType::kUser: {
GLuint tf;
ctx->ContextGL()->GenTransformFeedbacks(1, &tf);
SetObject(tf);
break;
}
}
}
WebGLTransformFeedback::~WebGLTransformFeedback() = default;
void WebGLTransformFeedback::DispatchDetached(gpu::gles2::GLES2Interface* gl) {
// Context loss is checked at higher levels.
for (WebGLBuffer* buffer : bound_indexed_transform_feedback_buffers_) {
if (buffer)
buffer->OnDetached(gl);
}
}
void WebGLTransformFeedback::DeleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
switch (type_) {
case TFType::kDefault:
break;
case TFType::kUser:
gl->DeleteTransformFeedbacks(1, &Object());
break;
}
// Member<> objects must not be accessed during the destruction,
// since they could have been already finalized.
// The finalizers of these objects will handle their detachment
// by themselves.
if (!DestructionInProgress())
DispatchDetached(gl);
}
void WebGLTransformFeedback::SetTarget(GLenum target) {
if (target_)
return;
if (target == GL_TRANSFORM_FEEDBACK)
target_ = target;
}
void WebGLTransformFeedback::SetProgram(WebGLProgram* program) {
program_ = program;
program_link_count_ = program->LinkCount();
}
bool WebGLTransformFeedback::ValidateProgramForResume(
WebGLProgram* program) const {
return program && program_ == program &&
program->LinkCount() == program_link_count_;
}
bool WebGLTransformFeedback::SetBoundIndexedTransformFeedbackBuffer(
GLuint index,
WebGLBuffer* buffer) {
if (index >= bound_indexed_transform_feedback_buffers_.size())
return false;
if (buffer)
buffer->OnAttached();
if (bound_indexed_transform_feedback_buffers_[index]) {
bound_indexed_transform_feedback_buffers_[index]->OnDetached(
Context()->ContextGL());
}
bound_indexed_transform_feedback_buffers_[index] = buffer;
return true;
}
bool WebGLTransformFeedback::GetBoundIndexedTransformFeedbackBuffer(
GLuint index,
WebGLBuffer** outBuffer) const {
if (index >= bound_indexed_transform_feedback_buffers_.size())
return false;
*outBuffer = bound_indexed_transform_feedback_buffers_[index].Get();
return true;
}
bool WebGLTransformFeedback::HasEnoughBuffers(GLuint num_required) const {
if (num_required > bound_indexed_transform_feedback_buffers_.size())
return false;
for (GLuint i = 0; i < num_required; i++) {
if (!bound_indexed_transform_feedback_buffers_[i])
return false;
}
return true;
}
bool WebGLTransformFeedback::UsesBuffer(WebGLBuffer* buffer) {
for (WebGLBuffer* feedback_buffer :
bound_indexed_transform_feedback_buffers_) {
if (feedback_buffer == buffer)
return true;
}
return false;
}
void WebGLTransformFeedback::UnbindBuffer(WebGLBuffer* buffer) {
for (wtf_size_t i = 0; i < bound_indexed_transform_feedback_buffers_.size();
++i) {
if (bound_indexed_transform_feedback_buffers_[i] == buffer) {
bound_indexed_transform_feedback_buffers_[i]->OnDetached(
Context()->ContextGL());
bound_indexed_transform_feedback_buffers_[i] = nullptr;
}
}
}
void WebGLTransformFeedback::Trace(Visitor* visitor) const {
visitor->Trace(bound_indexed_transform_feedback_buffers_);
visitor->Trace(program_);
WebGLObject::Trace(visitor);
}
} // namespace blink
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