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      1 /*
      2  * Copyright 2012 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 
      9 #ifndef GrGLContextInfo_DEFINED
     10 #define GrGLContextInfo_DEFINED
     11 
     12 #include "gl/GrGLInterface.h"
     13 #include "GrGLCaps.h"
     14 #include "GrGLSL.h"
     15 #include "GrGLUtil.h"
     16 
     17 #include "SkString.h"
     18 
     19 /**
     20  * Encapsulates information about an OpenGL context including the GrGLInterface
     21  * used to make GL calls, the OpenGL version, the GrGLBinding type of the
     22  * context, and GLSL version.
     23  */
     24 class GrGLContextInfo {
     25 public:
     26 
     27     /**
     28      * Default constructor, creates an uninitialized GrGLContextInfo
     29      */
     30     GrGLContextInfo();
     31 
     32     /**
     33      * Creates a GrGLContextInfo from a GrGLInterface and the currently
     34      * bound OpenGL context accessible by the GrGLInterface.
     35      */
     36     explicit GrGLContextInfo(const GrGLInterface* interface);
     37 
     38     /**
     39      * Copies a GrGLContextInfo
     40      */
     41     GrGLContextInfo(const GrGLContextInfo& ctx);
     42 
     43     ~GrGLContextInfo();
     44 
     45     /**
     46      * Copies a GrGLContextInfo
     47      */
     48     GrGLContextInfo& operator = (const GrGLContextInfo& ctx);
     49 
     50     /**
     51      * Initializes a GrGLContextInfo from a GrGLInterface and the currently
     52      * bound OpenGL context accessible by the GrGLInterface.
     53      */
     54     bool initialize(const GrGLInterface* interface);
     55     bool isInitialized() const;
     56 
     57     const GrGLInterface* interface() const { return fInterface; }
     58     GrGLBinding binding() const { return fBindingInUse; }
     59     GrGLVersion version() const { return fGLVersion; }
     60     GrGLSLGeneration glslGeneration() const { return fGLSLGeneration; }
     61     GrGLVendor vendor() const { return fVendor; }
     62     const GrGLCaps& caps() const { return fGLCaps; }
     63     GrGLCaps& caps() { return fGLCaps; }
     64 
     65     /**
     66      * Checks for extension support using a cached copy of the GL_EXTENSIONS
     67      * string.
     68      */
     69     bool hasExtension(const char* ext) const {
     70         if (!this->isInitialized()) {
     71             return false;
     72         }
     73         return GrGLHasExtensionFromString(ext, fExtensionString.c_str());
     74     }
     75 
     76 private:
     77     void reset();
     78 
     79     const GrGLInterface* fInterface;
     80     GrGLBinding          fBindingInUse;
     81     GrGLVersion          fGLVersion;
     82     GrGLSLGeneration     fGLSLGeneration;
     83     GrGLVendor           fVendor;
     84     SkString             fExtensionString;
     85     GrGLCaps             fGLCaps;
     86 };
     87 
     88 #endif
     89