src/libANGLE/Caps.h

//
// 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/Version.h"
#include "libANGLE/angletypes.h"
#include "libANGLE/renderer/Format.h"

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

namespace gl
{

struct Extensions;

typedef std::set<GLuint> SupportedSampleSet;

struct TextureCaps
{
    TextureCaps();
    TextureCaps(const TextureCaps &other);
    ~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, i.e. glFramebufferTexture2D
    bool textureAttachment;

    // Support for being used as a renderbuffer format, i.e. glFramebufferRenderbuffer
    bool renderbuffer;

    // 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;
};

TextureCaps GenerateMinimumTextureCaps(GLenum internalFormat,
                                       const Version &clientVersion,
                                       const Extensions &extensions);

class TextureCapsMap final : angle::NonCopyable
{
  public:
    TextureCapsMap();
    ~TextureCapsMap();

    // These methods are deprecated. Please use angle::Format for new features.
    void insert(GLenum internalFormat, const TextureCaps &caps);
    const TextureCaps &get(GLenum internalFormat) const;

    void clear();

    // Prefer using angle::Format methods.
    const TextureCaps &get(angle::FormatID formatID) const;
    void set(angle::FormatID formatID, const TextureCaps &caps);

  private:
    TextureCaps &get(angle::FormatID formatID);

    // Indexed by angle::FormatID
    std::array<TextureCaps, angle::kNumANGLEFormats> mFormatData;
};

void InitMinimumTextureCapsMap(const Version &clientVersion,
                               const Extensions &extensions,
                               TextureCapsMap *capsMap);

// Returns true if all the formats required to support GL_CHROMIUM_compressed_texture_etc are
// present. Does not determine if they are natively supported without decompression.
bool DetermineCompressedTextureETCSupport(const TextureCapsMap &textureCaps);

struct Extensions
{
    Extensions();
    Extensions(const Extensions &other);

    // 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
    // GL_EXT_texture_compression_bptc
    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 exist 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_EXT_texture_compression_s3tc_srgb
    // Implies that TextureCaps exist for GL_COMPRESSED_SRGB_S3TC_DXT1_EXT,
    // GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, and
    // GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
    bool textureCompressionS3TCsRGB;

    // GL_KHR_texture_compression_astc_hdr
    bool textureCompressionASTCHDR;

    // GL_KHR_texture_compression_astc_ldr
    bool textureCompressionASTCLDR;

    // GL_EXT_texture_compression_bptc
    bool textureCompressionBPTC;

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

    // OES_compressed_ETC2_RGB8_texture
    bool compressedETC2RGB8Texture;

    // OES_compressed_ETC2_sRGB8_texture
    bool compressedETC2sRGB8Texture;

    // OES_compressed_ETC2_punchthroughA_RGBA8_texture
    bool compressedETC2PunchthroughARGB8Texture;

    // OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture
    bool compressedETC2PunchthroughAsRGB8AlphaTexture;

    // OES_compressed_ETC2_RGBA8_texture
    bool compressedETC2RGBA8Texture;

    // OES_compressed_ETC2_sRGB8_alpha8_texture
    bool compressedETC2sRGB8Alpha8Texture;

    // OES_compressed_EAC_R11_unsigned_texture
    bool compressedEACR11UnsignedTexture;

    // OES_compressed_EAC_R11_signed_texture
    bool compressedEACR11SignedTexture;

    // OES_compressed_EAC_RG11_unsigned_texture
    bool compressedEACRG11UnsignedTexture;

    // OES_compressed_EAC_RG11_signed_texture
    bool compressedEACRG11SignedTexture;

    // GL_CHROMIUM_compressed_texture_etc
    // ONLY exposed if ETC texture formats are natively supported without decompression
    // Backends should enable this extension explicitly. It is not enabled with
    // setTextureExtensionSupport, use DetermineCompressedTextureETCSupport to check if all of the
    // individual formats required to support this extension are available.
    bool compressedTextureETC;

    // 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_EXT_disjoint_timer_query
    bool disjointTimerQuery;
    GLuint queryCounterBitsTimeElapsed;
    GLuint queryCounterBitsTimestamp;

    // GL_EXT_robustness
    bool robustness;

    // GL_KHR_robust_buffer_access_behavior
    bool robustBufferAccessBehavior;

    // GL_EXT_blend_minmax
    bool blendMinMax;

    // GL_ANGLE_framebuffer_blit
    bool framebufferBlit;

    // GL_ANGLE_framebuffer_multisample
    bool framebufferMultisample;

    // GL_ANGLE_instanced_arrays
    bool instancedArraysANGLE;
    // GL_EXT_instanced_arrays
    bool instancedArraysEXT;
    // Any version of the instanced arrays extension
    bool instancedArraysAny() const { return (instancedArraysANGLE || instancedArraysEXT); }

    // GL_ANGLE_pack_reverse_row_order
    bool packReverseRowOrder;

    // GL_OES_standard_derivatives
    bool standardDerivatives;

    // GL_EXT_shader_texture_lod
    bool shaderTextureLOD;

    // GL_EXT_frag_depth
    bool fragDepth;

    // OVR_multiview2
    bool multiview2;
    GLuint maxViews;

    // 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;

    // GL_OES_EGL_sync
    bool eglSync;

    // GL_EXT_memory_object
    bool memoryObject;

    // GL_EXT_memory_object_fd
    bool memoryObjectFd;

    // GL_EXT_semaphore
    bool semaphore;

    // GL_EXT_semaphore_fd
    bool semaphoreFd;

    // 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_copy_texture_3d
    bool copyTexture3d;

    // GL_ANGLE_webgl_compatibility
    bool webglCompatibility;

    // GL_ANGLE_request_extension
    bool requestExtension;

    // GL_CHROMIUM_bind_generates_resource
    bool bindGeneratesResource;

    // GL_ANGLE_robust_client_memory
    bool robustClientMemory;

    // GL_OES_texture_border_clamp
    bool textureBorderClamp;

    // GL_EXT_texture_sRGB_decode
    bool textureSRGBDecode;

    // GL_EXT_sRGB_write_control
    bool sRGBWriteControl;

    // GL_CHROMIUM_color_buffer_float_rgb
    bool colorBufferFloatRGB;

    // GL_CHROMIUM_color_buffer_float_rgba
    bool colorBufferFloatRGBA;

    // 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;

    // GL_OES_surfaceless_context
    bool surfacelessContext;

    // GL_ANGLE_client_arrays
    bool clientArrays;

    // GL_ANGLE_robust_resource_initialization
    bool robustResourceInitialization;

    // GL_ANGLE_program_cache_control
    bool programCacheControl;

    // GL_ANGLE_texture_rectangle
    bool textureRectangle;

    // GL_EXT_geometry_shader
    bool geometryShader;

    // GLES1 emulation: GLES1 extensions
    // GL_OES_point_size_array
    bool pointSizeArray;
    // GL_OES_texture_cube_map
    bool textureCubeMap;
    // GL_OES_point_sprite
    bool pointSprite;
    // GL_OES_draw_texture
    bool drawTexture;

    // EGL_ANGLE_explicit_context GL subextensions
    // GL_ANGLE_explicit_context_gles1
    bool explicitContextGles1;
    // GL_ANGLE_explicit_context
    bool explicitContext;

    // GL_KHR_parallel_shader_compile
    bool parallelShaderCompile;

    // GL_OES_texture_storage_multisample_2d_array
    bool textureStorageMultisample2DArray;

    // GL_ANGLE_multiview_multisample
    bool multiviewMultisample;

    // GL_EXT_blend_func_extended
    bool blendFuncExtended;
    GLuint maxDualSourceDrawBuffers;

    // GL_EXT_float_blend
    bool floatBlend;

    // GL_ANGLE_memory_size
    bool memorySize;

    // GL_ANGLE_texture_multisample
    bool textureMultisample;

    // GL_ANGLE_multi_draw
    bool multiDraw;

    // GL_ANGLE_provoking_vertex
    bool provokingVertex = false;

    // GL_CHROMIUM_lose_context
    bool loseContextCHROMIUM = false;
};

struct ExtensionInfo
{
    // If this extension can be enabled with glRequestExtension (GL_ANGLE_request_extension)
    bool Requestable = 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;

    // D3D9 does not support flexible varying register packing.
    bool noFlexibleVaryingPacking;

    // D3D does not support having multiple transform feedback outputs go to the same buffer.
    bool noDoubleBoundTransformFeedbackBuffers;
};

struct TypePrecision
{
    TypePrecision();
    TypePrecision(const TypePrecision &other);

    void setIEEEFloat();
    void setTwosComplementInt(unsigned int bits);
    void setSimulatedFloat(unsigned int range, unsigned int precision);
    void setSimulatedInt(unsigned int range);

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

    std::array<GLint, 2> range;
    GLint precision;
};

struct Caps
{
    Caps();
    Caps(const Caps &other);
    ~Caps();

    // ES 3.1 (April 29, 2015) 20.39: implementation dependent values
    GLuint64 maxElementIndex;
    GLuint max3DTextureSize;
    GLuint max2DTextureSize;
    GLuint maxRectangleTextureSize;
    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;
    GLuint 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;

    // Implementation dependent limits required on all shader types.
    // TODO(jiawei.shao@intel.com): organize all such limits into ShaderMap.
    // ES 3.1 (April 29, 2015) Table 20.43: Implementation dependent Vertex shader limits
    // ES 3.1 (April 29, 2015) Table 20.44: Implementation dependent Fragment shader limits
    // ES 3.1 (April 29, 2015) Table 20.45: implementation dependent compute shader limits
    // GL_EXT_geometry_shader (May 31, 2016) Table 20.43gs: Implementation dependent geometry shader
    // limits
    // GL_EXT_geometry_shader (May 31, 2016) Table 20.46: Implementation dependent aggregate shader
    // limits
    ShaderMap<GLuint> maxShaderUniformBlocks;
    ShaderMap<GLuint> maxShaderTextureImageUnits;
    ShaderMap<GLuint> maxShaderStorageBlocks;
    ShaderMap<GLuint> maxShaderUniformComponents;
    ShaderMap<GLuint> maxShaderAtomicCounterBuffers;
    ShaderMap<GLuint> maxShaderAtomicCounters;
    ShaderMap<GLuint> maxShaderImageUniforms;
    // Note that we can query MAX_COMPUTE_UNIFORM_COMPONENTS and MAX_GEOMETRY_UNIFORM_COMPONENTS_EXT
    // by GetIntegerv, but we can only use GetInteger64v on MAX_VERTEX_UNIFORM_COMPONENTS and
    // MAX_FRAGMENT_UNIFORM_COMPONENTS. Currently we use GLuint64 to store all these values so that
    // we can put them together into one ShaderMap.
    ShaderMap<GLuint64> maxCombinedShaderUniformComponents;

    // ES 3.1 (April 29, 2015) Table 20.43: Implementation dependent Vertex shader limits
    GLuint maxVertexAttributes;
    GLuint maxVertexUniformVectors;
    GLuint maxVertexOutputComponents;

    // ES 3.1 (April 29, 2015) Table 20.44: Implementation dependent Fragment shader limits
    GLuint maxFragmentUniformVectors;
    GLuint maxFragmentInputComponents;
    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 maxComputeSharedMemorySize;

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

    // GL_EXT_geometry_shader (May 31, 2016) Table 20.40: Implementation-Dependent Values (cont.)
    GLuint maxFramebufferLayers;
    GLuint layerProvokingVertex;

    // GL_EXT_geometry_shader (May 31, 2016) Table 20.43gs: Implementation dependent geometry shader
    // limits
    GLuint maxGeometryInputComponents;
    GLuint maxGeometryOutputComponents;
    GLuint maxGeometryOutputVertices;
    GLuint maxGeometryTotalOutputComponents;
    GLuint maxGeometryShaderInvocations;

    GLuint subPixelBits;

    // GLES1 emulation: Caps for ES 1.1. Taken from Table 6.20 / 6.22 in the OpenGL ES 1.1 spec.
    GLuint maxMultitextureUnits;
    GLuint maxClipPlanes;
    GLuint maxLights;
    static constexpr int GlobalMatrixStackDepth = 16;
    GLuint maxModelviewMatrixStackDepth;
    GLuint maxProjectionMatrixStackDepth;
    GLuint maxTextureMatrixStackDepth;
    GLfloat minSmoothPointSize;
    GLfloat maxSmoothPointSize;
    GLfloat minSmoothLineWidth;
    GLfloat maxSmoothLineWidth;
};

Caps GenerateMinimumCaps(const Version &clientVersion, const Extensions &extensions);
}  // namespace gl

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;

    // EGL_ANGLE_windows_ui_composition
    bool windowsUIComposition;

    // 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
    bool streamProducerD3DTexture;

    // EGL_KHR_fence_sync
    bool fenceSync;

    // EGL_KHR_wait_sync
    bool waitSync;

    // EGL_ANGLE_create_context_webgl_compatibility
    bool createContextWebGLCompatibility;

    // EGL_CHROMIUM_create_context_bind_generates_resource
    bool createContextBindGeneratesResource;

    // EGL_CHROMIUM_get_sync_values
    bool getSyncValues;

    // EGL_KHR_swap_buffers_with_damage
    bool swapBuffersWithDamage;

    // EGL_EXT_pixel_format_float
    bool pixelFormatFloat;

    // EGL_KHR_surfaceless_context
    bool surfacelessContext;

    // EGL_ANGLE_display_texture_share_group
    bool displayTextureShareGroup;

    // EGL_ANGLE_create_context_client_arrays
    bool createContextClientArrays;

    // EGL_ANGLE_program_cache_control
    bool programCacheControl;

    // EGL_ANGLE_robust_resource_initialization
    bool robustResourceInitialization;

    // EGL_ANGLE_iosurface_client_buffer
    bool iosurfaceClientBuffer;

    // EGL_ANGLE_create_context_extensions_enabled
    bool createContextExtensionsEnabled;

    // EGL_ANDROID_presentation_time
    bool presentationTime;

    // EGL_ANDROID_blob_cache
    bool blobCache;

    // EGL_ANDROID_image_native_buffer
    bool imageNativeBuffer;

    // EGL_ANDROID_get_frame_timestamps
    bool getFrameTimestamps;

    // EGL_ANDROID_recordable
    bool recordable;

    // EGL_ANGLE_power_preference
    bool powerPreference;
};

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();
    ClientExtensions(const ClientExtensions &other);

    // 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_platform_angle_vulkan
    bool platformANGLEVulkan;

    // EGL_ANGLE_platform_angle_context_virtualization
    bool platformANGLEContextVirtualization;

    // 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;

    // EGL_KHR_debug
    bool debug;

    // EGL_ANGLE_explicit_context
    bool explicitContext;
};

}  // namespace egl

#endif  // LIBANGLE_CAPS_H_