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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/transform_feedback_manager.h"
#include "base/numerics/checked_math.h"
#include "gpu/command_buffer/service/buffer_manager.h"
#include "ui/gl/gl_version_info.h"
namespace gpu {
namespace gles2 {
TransformFeedback::TransformFeedback(TransformFeedbackManager* manager,
GLuint client_id,
GLuint service_id)
: IndexedBufferBindingHost(
manager->max_transform_feedback_separate_attribs(),
GL_TRANSFORM_FEEDBACK_BUFFER,
manager->needs_emulation(),
false),
manager_(manager),
client_id_(client_id),
service_id_(service_id),
has_been_bound_(false),
active_(false),
paused_(false),
primitive_mode_(GL_NONE),
vertices_drawn_(0) {
DCHECK_LE(0u, client_id);
DCHECK_LT(0u, service_id);
}
TransformFeedback::~TransformFeedback() {
if (!manager_->lost_context()) {
if (active_)
glEndTransformFeedback();
glDeleteTransformFeedbacks(1, &service_id_);
}
}
void TransformFeedback::DoBindTransformFeedback(
GLenum target,
TransformFeedback* last_bound_transform_feedback,
Buffer* bound_transform_feedback_buffer) {
DCHECK_LT(0u, service_id_);
glBindTransformFeedback(target, service_id_);
// GL drivers differ on whether GL_TRANSFORM_FEEDBACK_BUFFER is changed
// when calling glBindTransformFeedback. To make them consistent, we
// explicitly bind the buffer we think should be bound here.
if (bound_transform_feedback_buffer &&
!bound_transform_feedback_buffer->IsDeleted()) {
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER,
bound_transform_feedback_buffer->service_id());
} else {
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, 0);
}
has_been_bound_ = true;
if (active_ && !paused_) {
// This could only happen during virtual context switching.
// Otherwise the validation should generate a GL error without calling
// into this function.
glResumeTransformFeedback();
}
if (last_bound_transform_feedback != this) {
if (last_bound_transform_feedback) {
last_bound_transform_feedback->SetIsBound(false);
}
SetIsBound(true);
}
}
void TransformFeedback::DoBeginTransformFeedback(GLenum primitive_mode) {
DCHECK(!active_);
DCHECK(primitive_mode == GL_POINTS ||
primitive_mode == GL_LINES ||
primitive_mode == GL_TRIANGLES);
glBeginTransformFeedback(primitive_mode);
active_ = true;
primitive_mode_ = primitive_mode;
vertices_drawn_ = 0;
}
void TransformFeedback::DoEndTransformFeedback() {
DCHECK(active_);
glEndTransformFeedback();
active_ = false;
paused_ = false;
}
void TransformFeedback::DoPauseTransformFeedback() {
DCHECK(active_ && !paused_);
glPauseTransformFeedback();
paused_ = true;
}
void TransformFeedback::DoResumeTransformFeedback() {
DCHECK(active_ && paused_);
glResumeTransformFeedback();
paused_ = false;
}
bool TransformFeedback::GetVerticesNeededForDraw(GLenum mode,
GLsizei count,
GLsizei primcount,
GLsizei pending_vertices_drawn,
GLsizei* vertices_out) const {
// Transform feedback only outputs complete primitives, so we need to round
// down to the nearest complete primitive before multiplying by the number of
// instances.
base::CheckedNumeric<GLsizei> checked_vertices =
vertices_drawn_ + pending_vertices_drawn;
base::CheckedNumeric<GLsizei> checked_count = count;
base::CheckedNumeric<GLsizei> checked_primcount = primcount;
switch (mode) {
case GL_TRIANGLES:
checked_vertices +=
checked_primcount * (checked_count - checked_count % 3);
break;
case GL_LINES:
checked_vertices +=
checked_primcount * (checked_count - checked_count % 2);
break;
default:
NOTREACHED();
case GL_POINTS:
checked_vertices += checked_primcount * checked_count;
}
// Note that the use of GLsizei limits us to 32-bit numbers of vertices. If
// the command buffer is upgraded to allow 64-bit buffer sizes then this
// should be expanded to 64 bits as well.
*vertices_out = checked_vertices.ValueOrDefault(0);
return checked_vertices.IsValid();
}
void TransformFeedback::OnVerticesDrawn(GLsizei vertices_drawn) {
if (active_ && !paused_) {
vertices_drawn_ = vertices_drawn;
}
}
TransformFeedbackManager::TransformFeedbackManager(
GLuint max_transform_feedback_separate_attribs,
bool needs_emulation)
: max_transform_feedback_separate_attribs_(
max_transform_feedback_separate_attribs),
needs_emulation_(needs_emulation),
lost_context_(false) {
DCHECK(needs_emulation);
}
TransformFeedbackManager::~TransformFeedbackManager() {
DCHECK(transform_feedbacks_.empty());
}
void TransformFeedbackManager::Destroy() {
transform_feedbacks_.clear();
}
TransformFeedback* TransformFeedbackManager::CreateTransformFeedback(
GLuint client_id, GLuint service_id) {
scoped_refptr<TransformFeedback> transform_feedback(
new TransformFeedback(this, client_id, service_id));
auto result = transform_feedbacks_.insert(
std::make_pair(client_id, transform_feedback));
DCHECK(result.second);
return result.first->second.get();
}
TransformFeedback* TransformFeedbackManager::GetTransformFeedback(
GLuint client_id) {
if (client_id == 0) {
return nullptr;
}
auto it = transform_feedbacks_.find(client_id);
return it != transform_feedbacks_.end() ? it->second.get() : nullptr;
}
void TransformFeedbackManager::RemoveTransformFeedback(GLuint client_id) {
if (client_id) {
transform_feedbacks_.erase(client_id);
}
}
} // namespace gles2
} // namespace gpu
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