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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 namespace base {
     19 class CommandLine;
     20 }
     21 
     22 namespace gpu {
     23 namespace gles2 {
     24 
     25 // FeatureInfo records the features that are available for a ContextGroup.
     26 class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
     27  public:
     28   struct FeatureFlags {
     29     FeatureFlags();
     30 
     31     bool chromium_color_buffer_float_rgba;
     32     bool chromium_color_buffer_float_rgb;
     33     bool chromium_framebuffer_multisample;
     34     bool chromium_sync_query;
     35     // Use glBlitFramebuffer() and glRenderbufferStorageMultisample() with
     36     // GL_EXT_framebuffer_multisample-style semantics, since they are exposed
     37     // as core GL functions on this implementation.
     38     bool use_core_framebuffer_multisample;
     39     bool multisampled_render_to_texture;
     40     // Use the IMG GLenum values and functions rather than EXT.
     41     bool use_img_for_multisampled_render_to_texture;
     42     bool oes_standard_derivatives;
     43     bool oes_egl_image_external;
     44     bool oes_depth24;
     45     bool oes_compressed_etc1_rgb8_texture;
     46     bool packed_depth24_stencil8;
     47     bool npot_ok;
     48     bool enable_texture_float_linear;
     49     bool enable_texture_half_float_linear;
     50     bool angle_translated_shader_source;
     51     bool angle_pack_reverse_row_order;
     52     bool arb_texture_rectangle;
     53     bool angle_instanced_arrays;
     54     bool occlusion_query_boolean;
     55     bool use_arb_occlusion_query2_for_occlusion_query_boolean;
     56     bool use_arb_occlusion_query_for_occlusion_query_boolean;
     57     bool native_vertex_array_object;
     58     bool ext_texture_format_bgra8888;
     59     bool enable_shader_name_hashing;
     60     bool enable_samplers;
     61     bool ext_draw_buffers;
     62     bool ext_frag_depth;
     63     bool ext_shader_texture_lod;
     64     bool use_async_readpixels;
     65     bool map_buffer_range;
     66     bool ext_discard_framebuffer;
     67     bool angle_depth_texture;
     68     bool is_angle;
     69     bool is_swiftshader;
     70     bool angle_texture_usage;
     71     bool ext_texture_storage;
     72   };
     73 
     74   struct Workarounds {
     75     Workarounds();
     76 
     77 #define GPU_OP(type, name) bool name;
     78     GPU_DRIVER_BUG_WORKAROUNDS(GPU_OP)
     79 #undef GPU_OP
     80 
     81     // Note: 0 here means use driver limit.
     82     GLint max_texture_size;
     83     GLint max_cube_map_texture_size;
     84     GLint max_fragment_uniform_vectors;
     85     GLint max_varying_vectors;
     86     GLint max_vertex_uniform_vectors;
     87   };
     88 
     89   // Constructor with workarounds taken from the current process's CommandLine
     90   FeatureInfo();
     91 
     92   // Constructor with workarounds taken from |command_line|
     93   FeatureInfo(const base::CommandLine& command_line);
     94 
     95   // Initializes the feature information. Needs a current GL context.
     96   bool Initialize();
     97   bool Initialize(const DisallowedFeatures& disallowed_features);
     98 
     99   const Validators* validators() const {
    100     return &validators_;
    101   }
    102 
    103   const ValueValidator<GLenum>& GetTextureFormatValidator(GLenum format) {
    104     return texture_format_validators_[format];
    105   }
    106 
    107   const std::string& extensions() const {
    108     return extensions_;
    109   }
    110 
    111   const FeatureFlags& feature_flags() const {
    112     return feature_flags_;
    113   }
    114 
    115   const Workarounds& workarounds() const {
    116     return workarounds_;
    117   }
    118 
    119  private:
    120   friend class base::RefCounted<FeatureInfo>;
    121   friend class BufferManagerClientSideArraysTest;
    122 
    123   typedef base::hash_map<GLenum, ValueValidator<GLenum> > ValidatorMap;
    124   ValidatorMap texture_format_validators_;
    125 
    126   ~FeatureInfo();
    127 
    128   void AddExtensionString(const std::string& str);
    129   void InitializeBasicState(const base::CommandLine& command_line);
    130   void InitializeFeatures();
    131 
    132   Validators validators_;
    133 
    134   DisallowedFeatures disallowed_features_;
    135 
    136   // The extensions string returned by glGetString(GL_EXTENSIONS);
    137   std::string extensions_;
    138 
    139   // Flags for some features
    140   FeatureFlags feature_flags_;
    141 
    142   // Flags for Workarounds.
    143   Workarounds workarounds_;
    144 
    145   DISALLOW_COPY_AND_ASSIGN(FeatureInfo);
    146 };
    147 
    148 }  // namespace gles2
    149 }  // namespace gpu
    150 
    151 #endif  // GPU_COMMAND_BUFFER_SERVICE_FEATURE_INFO_H_
    152