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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
      6 #define GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
      7 
      8 #include <set>
      9 #include <string>
     10 #include "base/containers/hash_tables.h"
     11 #include "base/memory/ref_counted.h"
     12 #include "base/sys_info.h"
     13 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
     14 #include "gpu/command_buffer/service/gles2_cmd_validation.h"
     15 #include "gpu/config/gpu_driver_bug_workaround_type.h"
     16 #include "gpu/gpu_export.h"
     17 
     18 class CommandLine;
     19 
     20 namespace gpu {
     21 namespace gles2 {
     22 
     23 // FeatureInfo records the features that are available for a ContextGroup.
     24 class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
     25  public:
     26   struct FeatureFlags {
     27     FeatureFlags();
     28 
     29     bool chromium_framebuffer_multisample;
     30     // Use glBlitFramebuffer() and glRenderbufferStorageMultisample() with
     31     // GL_EXT_framebuffer_multisample-style semantics, since they are exposed
     32     // as core GL functions on this implementation.
     33     bool use_core_framebuffer_multisample;
     34     bool multisampled_render_to_texture;
     35     // Use the IMG GLenum values and functions rather than EXT.
     36     bool use_img_for_multisampled_render_to_texture;
     37     bool oes_standard_derivatives;
     38     bool oes_egl_image_external;
     39     bool oes_depth24;
     40     bool oes_compressed_etc1_rgb8_texture;
     41     bool packed_depth24_stencil8;
     42     bool npot_ok;
     43     bool enable_texture_float_linear;
     44     bool enable_texture_half_float_linear;
     45     bool chromium_stream_texture;
     46     bool angle_translated_shader_source;
     47     bool angle_pack_reverse_row_order;
     48     bool arb_texture_rectangle;
     49     bool angle_instanced_arrays;
     50     bool occlusion_query_boolean;
     51     bool use_arb_occlusion_query2_for_occlusion_query_boolean;
     52     bool use_arb_occlusion_query_for_occlusion_query_boolean;
     53     bool native_vertex_array_object;
     54     bool ext_texture_format_bgra8888;
     55     bool enable_shader_name_hashing;
     56     bool enable_samplers;
     57     bool ext_draw_buffers;
     58     bool ext_frag_depth;
     59     bool use_async_readpixels;
     60     bool map_buffer_range;
     61     bool ext_discard_framebuffer;
     62     bool angle_depth_texture;
     63     bool is_angle;
     64     bool is_swiftshader;
     65     bool angle_texture_usage;
     66     bool ext_texture_storage;
     67   };
     68 
     69   struct Workarounds {
     70     Workarounds();
     71 
     72 #define GPU_OP(type, name) bool name;
     73     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
     74 #undef GPU_OP
     75 
     76     // Note: 0 here means use driver limit.
     77     GLint max_texture_size;
     78     GLint max_cube_map_texture_size;
     79   };
     80 
     81   // Constructor with workarounds taken from the current process's CommandLine
     82   FeatureInfo();
     83 
     84   // Constructor with workarounds taken from |command_line|
     85   FeatureInfo(const CommandLine& command_line);
     86 
     87   // Initializes the feature information. Needs a current GL context.
     88   bool Initialize();
     89   bool Initialize(const DisallowedFeatures& disallowed_features);
     90 
     91   const Validators* validators() const {
     92     return &validators_;
     93   }
     94 
     95   const ValueValidator<GLenum>& GetTextureFormatValidator(GLenum format) {
     96     return texture_format_validators_[format];
     97   }
     98 
     99   const std::string& extensions() const {
    100     return extensions_;
    101   }
    102 
    103   const FeatureFlags& feature_flags() const {
    104     return feature_flags_;
    105   }
    106 
    107   const Workarounds& workarounds() const {
    108     return workarounds_;
    109   }
    110 
    111  private:
    112   friend class base::RefCounted<FeatureInfo>;
    113   friend class BufferManagerClientSideArraysTest;
    114   friend class GLES2DecoderTestBase;
    115 
    116   typedef base::hash_map<GLenum, ValueValidator<GLenum> > ValidatorMap;
    117   ValidatorMap texture_format_validators_;
    118 
    119   ~FeatureInfo();
    120 
    121   void AddExtensionString(const std::string& str);
    122   void InitializeBasicState(const CommandLine& command_line);
    123   void InitializeFeatures();
    124 
    125   Validators validators_;
    126 
    127   DisallowedFeatures disallowed_features_;
    128 
    129   // The extensions string returned by glGetString(GL_EXTENSIONS);
    130   std::string extensions_;
    131 
    132   // Flags for some features
    133   FeatureFlags feature_flags_;
    134 
    135   // Flags for Workarounds.
    136   Workarounds workarounds_;
    137 
    138   DISALLOW_COPY_AND_ASSIGN(FeatureInfo);
    139 };
    140 
    141 }  // namespace gles2
    142 }  // namespace gpu
    143 
    144 #endif  // GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
    145