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      1 #ifndef _GLUCONTEXTINFO_HPP
      2 #define _GLUCONTEXTINFO_HPP
      3 /*-------------------------------------------------------------------------
      4  * drawElements Quality Program OpenGL ES Utilities
      5  * ------------------------------------------------
      6  *
      7  * Copyright 2014 The Android Open Source Project
      8  *
      9  * Licensed under the Apache License, Version 2.0 (the "License");
     10  * you may not use this file except in compliance with the License.
     11  * You may obtain a copy of the License at
     12  *
     13  *      http://www.apache.org/licenses/LICENSE-2.0
     14  *
     15  * Unless required by applicable law or agreed to in writing, software
     16  * distributed under the License is distributed on an "AS IS" BASIS,
     17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     18  * See the License for the specific language governing permissions and
     19  * limitations under the License.
     20  *
     21  *//*!
     22  * \file
     23  * \brief Context Info Class.
     24  *//*--------------------------------------------------------------------*/
     25 
     26 #include "gluDefs.hpp"
     27 
     28 #include <vector>
     29 #include <string>
     30 #include <set>
     31 
     32 namespace glu
     33 {
     34 
     35 class RenderContext;
     36 
     37 template <typename T, class ComputeValue>
     38 class CachedValue
     39 {
     40 public:
     41 	CachedValue (ComputeValue compute = ComputeValue(), const T& defaultValue = T())
     42 		: m_compute		(compute)
     43 		, m_value		(defaultValue)
     44 		, m_isComputed	(false)
     45 	{
     46 	}
     47 
     48 	const T& getValue (const RenderContext& context) const
     49 	{
     50 		if (!m_isComputed)
     51 		{
     52 			m_value			= m_compute(context);
     53 			m_isComputed	= true;
     54 		}
     55 		return m_value;
     56 	}
     57 
     58 private:
     59 	ComputeValue	m_compute;
     60 	mutable T		m_value;
     61 	mutable bool	m_isComputed;
     62 };
     63 
     64 class GetExtensions
     65 {
     66 public:
     67 	std::vector<std::string> operator() (const RenderContext& context) const;
     68 };
     69 
     70 class GetCompressedTextureFormats
     71 {
     72 public:
     73 	std::set<int> operator() (const RenderContext& context) const;
     74 };
     75 
     76 typedef CachedValue<std::vector<std::string>, GetExtensions>	ExtensionList;
     77 typedef CachedValue<std::set<int>, GetCompressedTextureFormats>	CompressedTextureFormats;
     78 
     79 /*--------------------------------------------------------------------*//*!
     80  * \brief Context information & limit query.
     81  *//*--------------------------------------------------------------------*/
     82 class ContextInfo
     83 {
     84 public:
     85 	virtual										~ContextInfo						(void);
     86 
     87 	virtual int									getInt								(int param) const;
     88 	virtual bool								getBool								(int param) const;
     89 	virtual const char*							getString							(int param) const;
     90 
     91 	virtual bool								isVertexUniformLoopSupported		(void) const { return true; }
     92 	virtual bool								isVertexDynamicLoopSupported		(void) const { return true; }
     93 	virtual bool								isFragmentHighPrecisionSupported	(void) const { return true; }
     94 	virtual bool								isFragmentUniformLoopSupported		(void) const { return true; }
     95 	virtual bool								isFragmentDynamicLoopSupported		(void) const { return true; }
     96 
     97 	virtual bool								isCompressedTextureFormatSupported	(int format) const;
     98 
     99 	const std::vector<std::string>&				getExtensions						(void) const { return m_extensions.getValue(m_context); }
    100 	bool										isExtensionSupported				(const char* extName) const;
    101 
    102 	static ContextInfo*							create								(const RenderContext& context);
    103 
    104 protected:
    105 												ContextInfo							(const RenderContext& context);
    106 
    107 	const RenderContext&						m_context;
    108 
    109 private:
    110 												ContextInfo							(const ContextInfo& other);
    111 	ContextInfo&								operator=							(const ContextInfo& other);
    112 
    113 	ExtensionList								m_extensions;
    114 	CompressedTextureFormats					m_compressedTextureFormats;
    115 };
    116 
    117 } // glu
    118 
    119 #endif // _GLUCONTEXTINFO_HPP
    120