AtomicGameEngine/Source/Atomic/Graphics/OpenGL/OGLRenderSurface.cpp

//
// Copyright (c) 2008-2015 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "../../Precompiled.h"

#include "../../Graphics/Camera.h"
#include "../../Graphics/Graphics.h"
#include "../../Graphics/GraphicsImpl.h"
#include "../../Graphics/Renderer.h"
#include "../../Graphics/RenderSurface.h"
#include "../../Graphics/Texture.h"

#include "../../DebugNew.h"

#ifdef GL_ES_VERSION_2_0
#define GL_RENDERBUFFER_EXT GL_RENDERBUFFER
#define glGenRenderbuffersEXT glGenRenderbuffers
#define glBindRenderbufferEXT glBindRenderbuffer
#define glRenderbufferStorageEXT glRenderbufferStorage
#define glDeleteRenderbuffersEXT glDeleteRenderbuffers
#endif

namespace Atomic
{

RenderSurface::RenderSurface(Texture* parentTexture) :
    parentTexture_(parentTexture),
    target_(GL_TEXTURE_2D),
    renderBuffer_(0),
    updateMode_(SURFACE_UPDATEVISIBLE),
    updateQueued_(false)
{
}

RenderSurface::~RenderSurface()
{
    Release();
}

void RenderSurface::SetNumViewports(unsigned num)
{
    viewports_.Resize(num);
}

void RenderSurface::SetViewport(unsigned index, Viewport* viewport)
{
    if (index >= viewports_.Size())
        viewports_.Resize(index + 1);

    viewports_[index] = viewport;
}

void RenderSurface::SetUpdateMode(RenderSurfaceUpdateMode mode)
{
    updateMode_ = mode;
}

void RenderSurface::SetLinkedRenderTarget(RenderSurface* renderTarget)
{
    if (renderTarget != this)
        linkedRenderTarget_ = renderTarget;
}

void RenderSurface::SetLinkedDepthStencil(RenderSurface* depthStencil)
{
    if (depthStencil != this)
        linkedDepthStencil_ = depthStencil;
}

void RenderSurface::QueueUpdate()
{
    if (!updateQueued_)
    {
        bool hasValidView = false;

        // Verify that there is at least 1 non-null viewport, as otherwise Renderer will not accept the surface and the update flag
        // will be left on
        for (unsigned i = 0; i < viewports_.Size(); ++i)
        {
            if (viewports_[i])
            {
                hasValidView = true;
                break;
            }
        }

        if (hasValidView)
        {
            Renderer* renderer = parentTexture_->GetSubsystem<Renderer>();
            if (renderer)
                renderer->QueueRenderSurface(this);

            updateQueued_ = true;
        }
    }
}

bool RenderSurface::CreateRenderBuffer(unsigned width, unsigned height, unsigned format)
{
    Graphics* graphics = parentTexture_->GetGraphics();
    if (!graphics)
        return false;

    Release();

    glGenRenderbuffersEXT(1, &renderBuffer_);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, renderBuffer_);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, format, width, height);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
    return true;
}

void RenderSurface::OnDeviceLost()
{
    Graphics* graphics = parentTexture_->GetGraphics();
    if (!graphics)
        return;

    for (unsigned i = 0; i < MAX_RENDERTARGETS; ++i)
    {
        if (graphics->GetRenderTarget(i) == this)
            graphics->ResetRenderTarget(i);
    }

    if (graphics->GetDepthStencil() == this)
        graphics->ResetDepthStencil();

    // Clean up also from non-active FBOs
    graphics->CleanupRenderSurface(this);

    renderBuffer_ = 0;
}

void RenderSurface::Release()
{
    Graphics* graphics = parentTexture_->GetGraphics();
    if (!graphics)
        return;

    if (!graphics->IsDeviceLost())
    {
        for (unsigned i = 0; i < MAX_RENDERTARGETS; ++i)
        {
            if (graphics->GetRenderTarget(i) == this)
                graphics->ResetRenderTarget(i);
        }

        if (graphics->GetDepthStencil() == this)
            graphics->ResetDepthStencil();

        // Clean up also from non-active FBOs
        graphics->CleanupRenderSurface(this);

        if (renderBuffer_)
            glDeleteRenderbuffersEXT(1, &renderBuffer_);
    }

    renderBuffer_ = 0;
}

int RenderSurface::GetWidth() const
{
    return parentTexture_->GetWidth();
}

int RenderSurface::GetHeight() const
{
    return parentTexture_->GetHeight();
}

TextureUsage RenderSurface::GetUsage() const
{
    return parentTexture_->GetUsage();
}

Viewport* RenderSurface::GetViewport(unsigned index) const
{
    return index < viewports_.Size() ? viewports_[index] : (Viewport*)0;
}

void RenderSurface::SetTarget(unsigned target)
{
    target_ = target;
}

void RenderSurface::WasUpdated()
{
    updateQueued_ = false;
}

}