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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#pragma once
#include <memory>
#include <utility>
namespace basegfx
{
class B2IVector;
}
namespace canvas
{
struct ISurface;
struct Vertex
{
float r,g,b,a;
float u,v;
float x,y,z;
};
/** Output module interface for backend render implementations.
Implement this interface for each operating system- or
library-specific rendering backend, which needs coupling with
the canvas rendering framework (which can be shared between
all backend implementations).
*/
struct IRenderModule
{
/** Type of primitive passed to the render module via
pushVertex()
*/
enum class PrimitiveType
{
Unknown,
Triangle,
Quad
};
virtual ~IRenderModule() {}
/// Lock rendermodule against concurrent access
virtual void lock() const = 0;
/// Unlock rendermodule for concurrent access
virtual void unlock() const = 0;
/** Maximal size of VRAM pages available
This is typically the maximum texture size of the
hardware, or some arbitrary limit if the backend is
software.
*/
virtual ::basegfx::B2IVector getPageSize() = 0;
/** Create a (possibly hardware-accelerated) surface
@return a pointer to a surface, which is an abstraction of
a piece of (possibly hardware-accelerated) texture memory.
*/
virtual std::shared_ptr<ISurface> createSurface( const ::basegfx::B2IVector& surfaceSize ) = 0;
/** Begin rendering the given primitive.
Each beginPrimitive() call must be matched with an
endPrimitive() call.
*/
virtual void beginPrimitive( PrimitiveType eType ) = 0;
/** Finish rendering a primitive.
Each beginPrimitive() call must be matched with an
endPrimitive() call.
*/
virtual void endPrimitive() = 0;
/** Add given vertex to current primitive
After issuing a beginPrimitive(), each pushVertex() adds a
vertex to the active primitive.
*/
virtual void pushVertex( const Vertex& vertex ) = 0;
/** Query error status
@returns true, if an error occurred during primitive
construction.
*/
virtual bool isError() = 0;
};
/// Little RAII wrapper for guarding access to IRenderModule interface
class RenderModuleGuard
{
public:
explicit RenderModuleGuard( std::shared_ptr<IRenderModule> xRenderModule ) :
mpRenderModule(std::move( xRenderModule ))
{
mpRenderModule->lock();
}
~RenderModuleGuard()
{
mpRenderModule->unlock();
}
RenderModuleGuard(const RenderModuleGuard&) = delete;
RenderModuleGuard& operator=( const RenderModuleGuard& ) = delete;
private:
const std::shared_ptr<IRenderModule> mpRenderModule;
};
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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