/* -*- 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 "WebGL2Context.h"

#include "WebGLActiveInfo.h"

#include "WebGLProgram.h"

#include "WebGLTransformFeedback.h"

#include "GLContext.h"

namespace mozilla {

// -------------------------------------------------------------------------

// Transform Feedback

already_AddRefed<WebGLTransformFeedback>

WebGL2Context::CreateTransformFeedback()

{

    const FuncScope funcScope(*this, "createTransformFeedback");

    if (IsContextLost())

        return nullptr;

    GLuint tf = 0;

    gl->fGenTransformFeedbacks(1, &tf);

    RefPtr<WebGLTransformFeedback> ret = new WebGLTransformFeedback(this, tf);

    return ret.forget();

}

void

WebGL2Context::DeleteTransformFeedback(WebGLTransformFeedback* tf)

{

    const FuncScope funcScope(*this, "deleteTransformFeedback");

    if (!ValidateDeleteObject(tf))

        return;

    if (tf->mIsActive) {

        ErrorInvalidOperation("Cannot delete active transform feedbacks.");

        return;

    }

    if (mBoundTransformFeedback == tf) {

        BindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, nullptr);

    }

    tf->RequestDelete();

}

bool

WebGL2Context::IsTransformFeedback(const WebGLTransformFeedback* const obj)

{

    const FuncScope funcScope(*this, "isTransformFeedback");

    if (!ValidateIsObject(obj))

        return false;

    return gl->fIsTransformFeedback(obj->mGLName);

}

void

WebGL2Context::BindTransformFeedback(GLenum target, WebGLTransformFeedback* tf)

{

    const FuncScope funcScope(*this, "bindTransformFeedback");

    if (IsContextLost())

        return;

    if (target != LOCAL_GL_TRANSFORM_FEEDBACK)

        return ErrorInvalidEnum("`target` must be TRANSFORM_FEEDBACK.");

    if (tf && !ValidateObject("tf", *tf))

        return;

    if (mBoundTransformFeedback->mIsActive &&

        !mBoundTransformFeedback->mIsPaused)

    {

        ErrorInvalidOperation("Currently bound transform feedback is active and not"

                              " paused.");

        return;

    }

    ////

    if (mBoundTransformFeedback) {

        mBoundTransformFeedback->AddBufferBindCounts(-1);

    }

    mBoundTransformFeedback = (tf ? tf : mDefaultTransformFeedback);

    gl->fBindTransformFeedback(target, mBoundTransformFeedback->mGLName);

    if (mBoundTransformFeedback) {

        mBoundTransformFeedback->AddBufferBindCounts(+1);

    }

}

void

WebGL2Context::BeginTransformFeedback(GLenum primMode)

{

    const FuncScope funcScope(*this, "beginTransformFeedback");

    if (IsContextLost())

        return;

    mBoundTransformFeedback->BeginTransformFeedback(primMode);

}

void

WebGL2Context::EndTransformFeedback()

{

    const FuncScope funcScope(*this, "endTransformFeedback");

    if (IsContextLost())

        return;

    mBoundTransformFeedback->EndTransformFeedback();

}

void

WebGL2Context::PauseTransformFeedback()

{

    const FuncScope funcScope(*this, "pauseTransformFeedback");

    if (IsContextLost())

        return;

    mBoundTransformFeedback->PauseTransformFeedback();

}

void

WebGL2Context::ResumeTransformFeedback()

{

    const FuncScope funcScope(*this, "resumeTransformFeedback");

    if (IsContextLost())

        return;

    mBoundTransformFeedback->ResumeTransformFeedback();

}

void

WebGL2Context::TransformFeedbackVaryings(WebGLProgram& program,

                                         const dom::Sequence<nsString>& varyings,

                                         GLenum bufferMode)

{

    const FuncScope funcScope(*this, "transformFeedbackVaryings");

    if (IsContextLost())

        return;

    if (!ValidateObject("program", program))

        return;

    program.TransformFeedbackVaryings(varyings, bufferMode);

}

already_AddRefed<WebGLActiveInfo>

WebGL2Context::GetTransformFeedbackVarying(const WebGLProgram& program, GLuint index)

{

    const FuncScope funcScope(*this, "getTransformFeedbackVarying");

    if (IsContextLost())

        return nullptr;

    if (!ValidateObject("program", program))

        return nullptr;

    return program.GetTransformFeedbackVarying(index);

}

} // namespace mozilla