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//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

#ifndef LIBANGLE_CAPS_H_
#define LIBANGLE_CAPS_H_

#include "angle_gl.h"
#include "libANGLE/angletypes.h"

#include <map>
#include <set>
#include <string>
#include <vector>
#include <array>

namespace gl
{

typedef std::set<GLuint> SupportedSampleSet;

struct TextureCaps
{
    TextureCaps();

    // Supports for basic texturing: glTexImage, glTexSubImage, etc
    bool texturable;

    // Support for linear or anisotropic filtering
    bool filterable;

    // Support for being used as a framebuffer attachment or renderbuffer format
    bool renderable;

    // Set of supported sample counts, only guaranteed to be valid in ES3.
    SupportedSampleSet sampleCounts;

    // Get the maximum number of samples supported
    GLuint getMaxSamples() const;

    // Get the number of supported samples that is at least as many as requested.  Returns 0 if
    // there are no sample counts available
    GLuint getNearestSamples(GLuint requestedSamples) const;
};

class TextureCapsMap
{
  public:
    typedef std::map<GLenum, TextureCaps>::const_iterator const_iterator;

    void insert(GLenum internalFormat, const TextureCaps &caps);
    void remove(GLenum internalFormat);
    void clear();

    const TextureCaps &get(GLenum internalFormat) const;

    const_iterator begin() const;
    const_iterator end() const;

    size_t size() const;

  private:
    typedef std::map<GLenum, TextureCaps> InternalFormatToCapsMap;
    InternalFormatToCapsMap mCapsMap;
};

struct Extensions
{
    Extensions();

    // Generate a vector of supported extension strings
    std::vector<std::string> getStrings() const;

    // Set all texture related extension support based on the supported textures.
    // Determines support for:
    // GL_OES_packed_depth_stencil
    // GL_OES_rgb8_rgba8
    // GL_EXT_texture_format_BGRA8888
    // GL_EXT_color_buffer_half_float,
    // GL_OES_texture_half_float, GL_OES_texture_half_float_linear
    // GL_OES_texture_float, GL_OES_texture_float_linear
    // GL_EXT_texture_rg
    // GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt3,
    // GL_ANGLE_texture_compression_dxt5
    // GL_KHR_texture_compression_astc_hdr, GL_KHR_texture_compression_astc_ldr
    // GL_OES_compressed_ETC1_RGB8_texture
    // GL_EXT_sRGB
    // GL_ANGLE_depth_texture, GL_OES_depth32
    // GL_EXT_color_buffer_float
    // GL_EXT_texture_norm16
    void setTextureExtensionSupport(const TextureCapsMap &textureCaps);

    // ES2 Extension support

    // GL_OES_element_index_uint
    bool elementIndexUint;

    // GL_OES_packed_depth_stencil
    bool packedDepthStencil;

    // GL_OES_get_program_binary
    bool getProgramBinary;

    // GL_OES_rgb8_rgba8
    // Implies that TextureCaps for GL_RGB8 and GL_RGBA8 exist
    bool rgb8rgba8;

    // GL_EXT_texture_format_BGRA8888
    // Implies that TextureCaps for GL_BGRA8 exist
    bool textureFormatBGRA8888;

    // GL_EXT_read_format_bgra
    bool readFormatBGRA;

    // GL_NV_pixel_buffer_object
    bool pixelBufferObject;

    // GL_OES_mapbuffer and GL_EXT_map_buffer_range
    bool mapBuffer;
    bool mapBufferRange;

    // GL_EXT_color_buffer_half_float
    // Together with GL_OES_texture_half_float in a GLES 2.0 context, implies that half-float
    // textures are renderable.
    bool colorBufferHalfFloat;

    // GL_OES_texture_half_float and GL_OES_texture_half_float_linear
    // Implies that TextureCaps for GL_RGB16F, GL_RGBA16F, GL_ALPHA32F_EXT, GL_LUMINANCE32F_EXT and
    // GL_LUMINANCE_ALPHA32F_EXT exist
    bool textureHalfFloat;
    bool textureHalfFloatLinear;

    // GL_OES_texture_float and GL_OES_texture_float_linear
    // Implies that TextureCaps for GL_RGB32F, GL_RGBA32F, GL_ALPHA16F_EXT, GL_LUMINANCE16F_EXT and
    // GL_LUMINANCE_ALPHA16F_EXT exist
    bool textureFloat;
    bool textureFloatLinear;

    // GL_EXT_texture_rg
    // Implies that TextureCaps for GL_R8, GL_RG8 (and floating point R/RG texture formats if floating point extensions
    // are also present) exist
    bool textureRG;

    // GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt3 and GL_ANGLE_texture_compression_dxt5
    // Implies that TextureCaps for GL_COMPRESSED_RGB_S3TC_DXT1_EXT, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
    // GL_COMPRESSED_RGBA_S3TC_DXT3_ANGLE and GL_COMPRESSED_RGBA_S3TC_DXT5_ANGLE
    bool textureCompressionDXT1;
    bool textureCompressionDXT3;
    bool textureCompressionDXT5;

    // GL_KHR_texture_compression_astc_hdr
    bool textureCompressionASTCHDR;

    // GL_KHR_texture_compression_astc_ldr
    bool textureCompressionASTCLDR;

    // GL_OES_compressed_ETC1_RGB8_texture
    // Implies that TextureCaps for GL_ETC1_RGB8_OES exist
    bool compressedETC1RGB8Texture;

    // GL_EXT_sRGB
    // Implies that TextureCaps for GL_SRGB8_ALPHA8 and GL_SRGB8 exist
    // TODO: Don't advertise this extension in ES3
    bool sRGB;

    // GL_ANGLE_depth_texture
    bool depthTextures;

    // GL_OES_depth32
    // Allows DEPTH_COMPONENT32_OES as a valid Renderbuffer format.
    bool depth32;

    // GL_EXT_texture_storage
    bool textureStorage;

    // GL_OES_texture_npot
    bool textureNPOT;

    // GL_EXT_draw_buffers
    bool drawBuffers;

    // GL_EXT_texture_filter_anisotropic
    bool textureFilterAnisotropic;
    GLfloat maxTextureAnisotropy;

    // GL_EXT_occlusion_query_boolean
    bool occlusionQueryBoolean;

    // GL_NV_fence
    bool fence;

    // GL_ANGLE_timer_query
    bool timerQuery;

    // GL_EXT_disjoint_timer_query
    bool disjointTimerQuery;
    GLuint queryCounterBitsTimeElapsed;
    GLuint queryCounterBitsTimestamp;

    // GL_EXT_robustness
    bool robustness;

    // GL_EXT_blend_minmax
    bool blendMinMax;

    // GL_ANGLE_framebuffer_blit
    bool framebufferBlit;

    // GL_ANGLE_framebuffer_multisample
    bool framebufferMultisample;

    // GL_ANGLE_instanced_arrays
    bool instancedArrays;

    // GL_ANGLE_pack_reverse_row_order
    bool packReverseRowOrder;

    // GL_OES_standard_derivatives
    bool standardDerivatives;

    // GL_EXT_shader_texture_lod
    bool shaderTextureLOD;

    // GL_EXT_shader_framebuffer_fetch
    bool shaderFramebufferFetch;

    // GL_ARM_shader_framebuffer_fetch
    bool ARMshaderFramebufferFetch;

    // GL_NV_shader_framebuffer_fetch
    bool NVshaderFramebufferFetch;

    // GL_EXT_frag_depth
    bool fragDepth;

    // GL_ANGLE_texture_usage
    bool textureUsage;

    // GL_ANGLE_translated_shader_source
    bool translatedShaderSource;

    // GL_OES_fbo_render_mipmap
    bool fboRenderMipmap;

    // GL_EXT_discard_framebuffer
    bool discardFramebuffer;

    // EXT_debug_marker
    bool debugMarker;

    // GL_OES_EGL_image
    bool eglImage;

    // GL_OES_EGL_image_external
    bool eglImageExternal;

    // GL_OES_EGL_image_external_essl3
    bool eglImageExternalEssl3;

    // NV_EGL_stream_consumer_external
    bool eglStreamConsumerExternal;

    // EXT_unpack_subimage
    bool unpackSubimage;

    // NV_pack_subimage
    bool packSubimage;

    // GL_OES_vertex_array_object
    bool vertexArrayObject;

    // GL_KHR_debug
    bool debug;
    GLuint maxDebugMessageLength;
    GLuint maxDebugLoggedMessages;
    GLuint maxDebugGroupStackDepth;
    GLuint maxLabelLength;

    // KHR_no_error
    bool noError;

    // GL_ANGLE_lossy_etc_decode
    bool lossyETCDecode;

    // GL_CHROMIUM_bind_uniform_location
    bool bindUniformLocation;

    // GL_CHROMIUM_sync_query
    bool syncQuery;

    // GL_CHROMIUM_copy_texture
    bool copyTexture;

    // GL_CHROMIUM_copy_compressed_texture
    bool copyCompressedTexture;

    // GL_ANGLE_webgl_compatibility
    bool webglCompatibility;

    // GL_CHROMIUM_bind_generates_resource
    bool bindGeneratesResource;

    // GL_ANGLE_robust_client_memory
    bool robustClientMemory;

    // GL_EXT_texture_sRGB_decode
    bool textureSRGBDecode;

    // GL_EXT_sRGB_write_control
    bool sRGBWriteControl;

    // ES3 Extension support

    // GL_EXT_color_buffer_float
    bool colorBufferFloat;

    // GL_EXT_multisample_compatibility.
    // written against ES 3.1 but can apply to earlier versions.
    bool multisampleCompatibility;

    // GL_CHROMIUM_framebuffer_mixed_samples
    bool framebufferMixedSamples;

    // GL_EXT_texture_norm16
    // written against ES 3.1 but can apply to ES 3.0 as well.
    bool textureNorm16;

    // GL_CHROMIUM_path_rendering
    bool pathRendering;
};

struct ExtensionInfo
{
    // If this extension can be enabled with glEnableExtension (GL_ANGLE_webgl_compatibility)
    bool Enableable = false;

    // Pointer to a boolean member of the Extensions struct
    typedef bool(Extensions::*ExtensionBool);
    ExtensionBool ExtensionsMember = nullptr;
};

using ExtensionInfoMap = std::map<std::string, ExtensionInfo>;
const ExtensionInfoMap &GetExtensionInfoMap();

struct Limitations
{
    Limitations();

    // Renderer doesn't support gl_FrontFacing in fragment shaders
    bool noFrontFacingSupport;

    // Renderer doesn't support GL_SAMPLE_ALPHA_TO_COVERAGE
    bool noSampleAlphaToCoverageSupport;

    // In glVertexAttribDivisorANGLE, attribute zero must have a zero divisor
    bool attributeZeroRequiresZeroDivisorInEXT;

    // Unable to support different values for front and back faces for stencil refs and masks
    bool noSeparateStencilRefsAndMasks;

    // Renderer doesn't support non-constant indexing loops in fragment shader
    bool shadersRequireIndexedLoopValidation;

    // Renderer doesn't support Simultaneous use of GL_CONSTANT_ALPHA/GL_ONE_MINUS_CONSTANT_ALPHA
    // and GL_CONSTANT_COLOR/GL_ONE_MINUS_CONSTANT_COLOR blend functions.
    bool noSimultaneousConstantColorAndAlphaBlendFunc;
};

struct TypePrecision
{
    TypePrecision();

    void setIEEEFloat();
    void setTwosComplementInt(unsigned int bits);
    void setSimulatedInt(unsigned int range);

    void get(GLint *returnRange, GLint *returnPrecision) const;

    GLint range[2];
    GLint precision;
};

struct Caps
{
    Caps();

    // ES 3.1 (April 29, 2015) 20.39: implementation dependent values
    GLuint64 maxElementIndex;
    GLuint max3DTextureSize;
    GLuint max2DTextureSize;
    GLuint maxArrayTextureLayers;
    GLfloat maxLODBias;
    GLuint maxCubeMapTextureSize;
    GLuint maxRenderbufferSize;
    GLfloat minAliasedPointSize;
    GLfloat maxAliasedPointSize;
    GLfloat minAliasedLineWidth;
    GLfloat maxAliasedLineWidth;

    // ES 3.1 (April 29, 2015) 20.40: implementation dependent values (cont.)
    GLuint maxDrawBuffers;
    GLuint maxFramebufferWidth;
    GLuint maxFramebufferHeight;
    GLuint maxFramebufferSamples;
    GLuint maxColorAttachments;
    GLuint maxViewportWidth;
    GLuint maxViewportHeight;
    GLuint maxSampleMaskWords;
    GLuint maxColorTextureSamples;
    GLuint maxDepthTextureSamples;
    GLuint maxIntegerSamples;
    GLuint64 maxServerWaitTimeout;

    // ES 3.1 (April 29, 2015) Table 20.41: Implementation dependent values (cont.)
    GLint maxVertexAttribRelativeOffset;
    GLint maxVertexAttribBindings;
    GLint maxVertexAttribStride;
    GLuint maxElementsIndices;
    GLuint maxElementsVertices;
    std::vector<GLenum> compressedTextureFormats;
    std::vector<GLenum> programBinaryFormats;
    std::vector<GLenum> shaderBinaryFormats;
    TypePrecision vertexHighpFloat;
    TypePrecision vertexMediumpFloat;
    TypePrecision vertexLowpFloat;
    TypePrecision vertexHighpInt;
    TypePrecision vertexMediumpInt;
    TypePrecision vertexLowpInt;
    TypePrecision fragmentHighpFloat;
    TypePrecision fragmentMediumpFloat;
    TypePrecision fragmentLowpFloat;
    TypePrecision fragmentHighpInt;
    TypePrecision fragmentMediumpInt;
    TypePrecision fragmentLowpInt;

    // ES 3.1 (April 29, 2015) Table 20.43: Implementation dependent Vertex shader limits
    GLuint maxVertexAttributes;
    GLuint maxVertexUniformComponents;
    GLuint maxVertexUniformVectors;
    GLuint maxVertexUniformBlocks;
    GLuint maxVertexOutputComponents;
    GLuint maxVertexTextureImageUnits;
    GLuint maxVertexAtomicCounterBuffers;
    GLuint maxVertexAtomicCounters;
    GLuint maxVertexImageUniforms;
    GLuint maxVertexShaderStorageBlocks;

    // ES 3.1 (April 29, 2015) Table 20.44: Implementation dependent Fragment shader limits
    GLuint maxFragmentUniformComponents;
    GLuint maxFragmentUniformVectors;
    GLuint maxFragmentUniformBlocks;
    GLuint maxFragmentInputComponents;
    GLuint maxTextureImageUnits;
    GLuint maxFragmentAtomicCounterBuffers;
    GLuint maxFragmentAtomicCounters;
    GLuint maxFragmentImageUniforms;
    GLuint maxFragmentShaderStorageBlocks;
    GLint minProgramTextureGatherOffset;
    GLuint maxProgramTextureGatherOffset;
    GLint minProgramTexelOffset;
    GLint maxProgramTexelOffset;

    // ES 3.1 (April 29, 2015) Table 20.45: implementation dependent compute shader limits
    std::array<GLuint, 3> maxComputeWorkGroupCount;
    std::array<GLuint, 3> maxComputeWorkGroupSize;
    GLuint maxComputeWorkGroupInvocations;
    GLuint maxComputeUniformBlocks;
    GLuint maxComputeTextureImageUnits;
    GLuint maxComputeSharedMemorySize;
    GLuint maxComputeUniformComponents;
    GLuint maxComputeAtomicCounterBuffers;
    GLuint maxComputeAtomicCounters;
    GLuint maxComputeImageUniforms;
    GLuint maxCombinedComputeUniformComponents;
    GLuint maxComputeShaderStorageBlocks;

    // ES 3.1 (April 29, 2015) Table 20.46: implementation dependent aggregate shader limits
    GLuint maxUniformBufferBindings;
    GLuint64 maxUniformBlockSize;
    GLuint uniformBufferOffsetAlignment;
    GLuint maxCombinedUniformBlocks;
    GLuint64 maxCombinedVertexUniformComponents;
    GLuint64 maxCombinedFragmentUniformComponents;
    GLuint maxVaryingComponents;
    GLuint maxVaryingVectors;
    GLuint maxCombinedTextureImageUnits;
    GLuint maxCombinedShaderOutputResources;

    // ES 3.1 (April 29, 2015) Table 20.47: implementation dependent aggregate shader limits (cont.)
    GLuint maxUniformLocations;
    GLuint maxAtomicCounterBufferBindings;
    GLuint maxAtomicCounterBufferSize;
    GLuint maxCombinedAtomicCounterBuffers;
    GLuint maxCombinedAtomicCounters;
    GLuint maxImageUnits;
    GLuint maxCombinedImageUniforms;
    GLuint maxShaderStorageBufferBindings;
    GLuint64 maxShaderStorageBlockSize;
    GLuint maxCombinedShaderStorageBlocks;
    GLuint shaderStorageBufferOffsetAlignment;

    // ES 3.1 (April 29, 2015) Table 20.48: implementation dependent transform feedback limits
    GLuint maxTransformFeedbackInterleavedComponents;
    GLuint maxTransformFeedbackSeparateAttributes;
    GLuint maxTransformFeedbackSeparateComponents;

    // ES 3.1 (April 29, 2015) Table 20.49: Framebuffer Dependent Values
    GLuint maxSamples;
};

}

namespace egl
{

struct Caps
{
    Caps();

    // Support for NPOT surfaces
    bool textureNPOT;
};

struct DisplayExtensions
{
    DisplayExtensions();

    // Generate a vector of supported extension strings
    std::vector<std::string> getStrings() const;

    // EGL_EXT_create_context_robustness
    bool createContextRobustness;

    // EGL_ANGLE_d3d_share_handle_client_buffer
    bool d3dShareHandleClientBuffer;

    // EGL_ANGLE_d3d_texture_client_buffer
    bool d3dTextureClientBuffer;

    // EGL_ANGLE_surface_d3d_texture_2d_share_handle
    bool surfaceD3DTexture2DShareHandle;

    // EGL_ANGLE_query_surface_pointer
    bool querySurfacePointer;

    // EGL_ANGLE_window_fixed_size
    bool windowFixedSize;

    // EGL_ANGLE_keyed_mutex
    bool keyedMutex;

    // EGL_ANGLE_surface_orientation
    bool surfaceOrientation;

    // EGL_NV_post_sub_buffer
    bool postSubBuffer;

    // EGL_KHR_create_context
    bool createContext;

    // EGL_EXT_device_query
    bool deviceQuery;

    // EGL_KHR_image
    bool image;

    // EGL_KHR_image_base
    bool imageBase;

    // EGL_KHR_image_pixmap
    bool imagePixmap;

    // EGL_KHR_gl_texture_2D_image
    bool glTexture2DImage;

    // EGL_KHR_gl_texture_cubemap_image
    bool glTextureCubemapImage;

    // EGL_KHR_gl_texture_3D_image
    bool glTexture3DImage;

    // EGL_KHR_gl_renderbuffer_image
    bool glRenderbufferImage;

    // EGL_KHR_get_all_proc_addresses
    bool getAllProcAddresses;

    // EGL_ANGLE_flexible_surface_compatibility
    bool flexibleSurfaceCompatibility;

    // EGL_ANGLE_direct_composition
    bool directComposition;

    // KHR_create_context_no_error
    bool createContextNoError;

    // EGL_KHR_stream
    bool stream;

    // EGL_KHR_stream_consumer_gltexture
    bool streamConsumerGLTexture;

    // EGL_NV_stream_consumer_gltexture_yuv
    bool streamConsumerGLTextureYUV;

    // EGL_ANGLE_stream_producer_d3d_texture_nv12
    bool streamProducerD3DTextureNV12;

    // EGL_ANGLE_create_context_webgl_compatibility
    bool createContextWebGLCompatibility;

    // EGL_CHROMIUM_create_context_bind_generates_resource
    bool createContextBindGeneratesResource;

    // EGL_EXT_swap_buffers_with_damage
    bool swapBuffersWithDamage;
};

struct DeviceExtensions
{
    DeviceExtensions();

    // Generate a vector of supported extension strings
    std::vector<std::string> getStrings() const;

    // EGL_ANGLE_device_d3d
    bool deviceD3D;
};

struct ClientExtensions
{
    ClientExtensions();

    // Generate a vector of supported extension strings
    std::vector<std::string> getStrings() const;

    // EGL_EXT_client_extensions
    bool clientExtensions;

    // EGL_EXT_platform_base
    bool platformBase;

    // EGL_EXT_platform_device
    bool platformDevice;

    // EGL_ANGLE_platform_angle
    bool platformANGLE;

    // EGL_ANGLE_platform_angle_d3d
    bool platformANGLED3D;

    // EGL_ANGLE_platform_angle_opengl
    bool platformANGLEOpenGL;

    // EGL_ANGLE_platform_angle_null
    bool platformANGLENULL;

    // EGL_ANGLE_device_creation
    bool deviceCreation;

    // EGL_ANGLE_device_creation_d3d11
    bool deviceCreationD3D11;

    // EGL_ANGLE_x11_visual
    bool x11Visual;

    // EGL_ANGLE_experimental_present_path
    bool experimentalPresentPath;

    // EGL_KHR_client_get_all_proc_addresses
    bool clientGetAllProcAddresses;
};

}

#endif // LIBANGLE_CAPS_H_