//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// RenderbufferGL.cpp: Implements the class methods for RenderbufferGL.

#include "libANGLE/renderer/gl/RenderbufferGL.h"

#include "common/debug.h"
#include "libANGLE/Caps.h"
#include "libANGLE/Context.h"
#include "libANGLE/angletypes.h"
#include "libANGLE/renderer/gl/BlitGL.h"
#include "libANGLE/renderer/gl/ContextGL.h"
#include "libANGLE/renderer/gl/FunctionsGL.h"
#include "libANGLE/renderer/gl/ImageGL.h"
#include "libANGLE/renderer/gl/StateManagerGL.h"
#include "libANGLE/renderer/gl/formatutilsgl.h"
#include "libANGLE/renderer/gl/renderergl_utils.h"
#include "platform/autogen/FeaturesGL_autogen.h"

namespace rx
{
RenderbufferGL::RenderbufferGL(const gl::RenderbufferState &state, GLuint id)
    : RenderbufferImpl(state), mRenderbufferID(id)
{}

RenderbufferGL::~RenderbufferGL()
{
    ASSERT(mRenderbufferID == 0);
}

void RenderbufferGL::onDestroy(const gl::Context *context)
{
    StateManagerGL *stateManager = GetStateManagerGL(context);
    stateManager->deleteRenderbuffer(mRenderbufferID);
    mRenderbufferID = 0;
}

angle::Result RenderbufferGL::setStorage(const gl::Context *context,
                                         GLenum internalformat,
                                         GLsizei width,
                                         GLsizei height)
{
    const FunctionsGL *functions      = GetFunctionsGL(context);
    StateManagerGL *stateManager      = GetStateManagerGL(context);
    const angle::FeaturesGL &features = GetFeaturesGL(context);

    if (features.reattachFboDepthStencilOnReallocation.enabled)
    {
        onStateChange(angle::SubjectMessage::ObjectReallocated);
    }

    stateManager->bindRenderbuffer(GL_RENDERBUFFER, mRenderbufferID);

    nativegl::RenderbufferFormat renderbufferFormat =
        nativegl::GetRenderbufferFormat(functions, features, internalformat);
    ANGLE_GL_TRY_ALWAYS_CHECK(
        context, functions->renderbufferStorage(GL_RENDERBUFFER, renderbufferFormat.internalFormat,
                                                width, height));

    mNativeInternalFormat = renderbufferFormat.internalFormat;

    return angle::Result::Continue;
}

angle::Result RenderbufferGL::setStorageMultisample(const gl::Context *context,
                                                    GLsizei samples,
                                                    GLenum internalformat,
                                                    GLsizei width,
                                                    GLsizei height,
                                                    gl::MultisamplingMode mode)
{
    const FunctionsGL *functions      = GetFunctionsGL(context);
    StateManagerGL *stateManager      = GetStateManagerGL(context);
    const angle::FeaturesGL &features = GetFeaturesGL(context);

    if (features.reattachFboDepthStencilOnReallocation.enabled)
    {
        onStateChange(angle::SubjectMessage::ObjectReallocated);
    }

    stateManager->bindRenderbuffer(GL_RENDERBUFFER, mRenderbufferID);

    nativegl::RenderbufferFormat renderbufferFormat =
        nativegl::GetRenderbufferFormat(functions, features, internalformat);
    if (mode == gl::MultisamplingMode::Regular)
    {
        ANGLE_GL_TRY_ALWAYS_CHECK(context, functions->renderbufferStorageMultisample(
                                               GL_RENDERBUFFER, samples,
                                               renderbufferFormat.internalFormat, width, height));
    }
    else
    {
        ASSERT(mode == gl::MultisamplingMode::MultisampledRenderToTexture);

        if (functions->renderbufferStorageMultisampleEXT)
        {
            ANGLE_GL_TRY_ALWAYS_CHECK(
                context,
                functions->renderbufferStorageMultisampleEXT(
                    GL_RENDERBUFFER, samples, renderbufferFormat.internalFormat, width, height));
        }
        else
        {
            ASSERT(functions->renderbufferStorageMultisampleIMG);
            ANGLE_GL_TRY_ALWAYS_CHECK(
                context,
                functions->renderbufferStorageMultisampleIMG(
                    GL_RENDERBUFFER, samples, renderbufferFormat.internalFormat, width, height));
        }
    }

    mNativeInternalFormat = renderbufferFormat.internalFormat;

    return angle::Result::Continue;
}

angle::Result RenderbufferGL::setStorageEGLImageTarget(const gl::Context *context,
                                                       egl::Image *image)
{
    ImageGL *imageGL = GetImplAs<ImageGL>(image);
    return imageGL->setRenderbufferStorage(context, this, &mNativeInternalFormat);
}

GLuint RenderbufferGL::getRenderbufferID() const
{
    return mRenderbufferID;
}

angle::Result RenderbufferGL::initializeContents(const gl::Context *context,
                                                 GLenum binding,
                                                 const gl::ImageIndex &imageIndex)
{
    BlitGL *blitter = GetBlitGL(context);
    return blitter->clearRenderbuffer(context, this, mNativeInternalFormat);
}

GLenum RenderbufferGL::getNativeInternalFormat() const
{
    return mNativeInternalFormat;
}

}  // namespace rx