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contextCaps.h
1 //
2 // Copyright 2018 Pixar
3 //
4 // Licensed under the Apache License, Version 2.0 (the "Apache License")
5 // with the following modification; you may not use this file except in
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24 #ifndef GLF_CONTEXT_CAPS_H
25 #define GLF_CONTEXT_CAPS_H
26 
27 #include "pxr/pxr.h"
28 #include "pxr/imaging/glf/api.h"
29 #include "pxr/base/tf/singleton.h"
30 
31 #include <boost/noncopyable.hpp>
32 
33 PXR_NAMESPACE_OPEN_SCOPE
34 
35 
59 class GlfContextCaps : boost::noncopyable {
60 public:
61 
66  GLF_API
67  static void InitInstance();
68 
72  GLF_API
73  static const GlfContextCaps &GetInstance();
74 
75 
76 
77  // GL version
78  int glVersion; // 400 (4.0), 410 (4.1), ...
79 
80  // Whether or not we are running with core profile
81  bool coreProfile;
82 
83  // Max constants
84  int maxArrayTextureLayers;
85  int maxUniformBlockSize;
86  int maxShaderStorageBlockSize;
87  int maxTextureBufferSize;
88  int uniformBufferOffsetAlignment;
89 
90  // GL extensions (ordered by version)
91  bool arrayTexturesEnabled; // EXT_texture_array (3.0)
92  bool shaderStorageBufferEnabled; // ARB_shader_storage_buffer_object (4.3)
93  bool bufferStorageEnabled; // ARB_buffer_storage (4.4)
94  bool directStateAccessEnabled; // ARB_direct_state_access (4.5)
95  bool multiDrawIndirectEnabled; // ARB_multi_draw_indirect (4.5)
96 
97  bool bindlessTextureEnabled; // ARB_bindless_texture
98  bool bindlessBufferEnabled; // NV_shader_buffer_load
99 
100  // GLSL version and extensions
101  int glslVersion; // 400, 410, ...
102  bool explicitUniformLocation; // ARB_explicit_uniform_location (4.3)
103  bool shadingLanguage420pack; // ARB_shading_language_420pack (4.2)
104  bool shaderDrawParametersEnabled; // ARB_shader_draw_parameters (4.5)
105 
106  // workarounds for driver issues
107  bool copyBufferEnabled;
108 
109  bool floatingPointBuffersEnabled;
110 
111 private:
112  void _LoadCaps();
113  GlfContextCaps();
114  ~GlfContextCaps() = default;
115 
116  friend class TfSingleton<GlfContextCaps>;
117 };
118 
119 GLF_API_TEMPLATE_CLASS(TfSingleton<GlfContextCaps>);
120 
121 PXR_NAMESPACE_CLOSE_SCOPE
122 
123 #endif // GLF_CONTEXT_CAPS_H
124 
Manage a single instance of an object (see.
Definition: singleton.h:122
This class is intended to be a cache of the capabilites (resource limits and features) of the underly...
Definition: contextCaps.h:59
static GLF_API const GlfContextCaps & GetInstance()
GetInstance() returns the filled capabilities structure.
static GLF_API void InitInstance()
InitInstance queries the GL context for its capabilities.