src/libGLESv2/Caps.h

#ifndef LIBGLESV2_CAPS_H
#define LIBGLESV2_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.
//

#include <GLES2/gl2.h>
#include <GLES3/gl3.h>

#include <set>
#include <unordered_map>
#include <vector>
#include <string>

namespace gl
{

struct TextureCaps
{
    TextureCaps();

    bool texture2D;
    bool textureCubeMap;
    bool texture3D;
    bool texture2DArray;
    bool filtering;
    bool colorRendering;
    bool depthRendering;
    bool stencilRendering;

    std::set<GLuint> sampleCounts;
};

class TextureCapsMap
{
  public:
    void insert(GLenum internalFormat, const TextureCaps &caps);
    void remove(GLenum internalFormat);

    const TextureCaps &get(GLenum internalFormat) const;

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

struct Extensions
{
    Extensions();

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

    // Set all texture related extension support based on the supported textures.
    // Determines support for:
    // GL_OES_rgb8_rgba8
    // GL_EXT_texture_format_BGRA8888
    // 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_ANGLE_depth_texture
    // GL_EXT_color_buffer_float
    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_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_ANGLE_depth_texture
    bool depthTextures;

    // 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_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_frag_depth
    bool fragDepth;

    // GL_ANGLE_texture_usage
    bool textureUsage;

    // GL_ANGLE_translated_shader_source
    bool translatedShaderSource;

    // ES3 Extension support

    // GL_EXT_color_buffer_float
    bool colorBufferFloat;
};

struct Caps
{
    Caps();

    // Texture format support
    TextureCapsMap textureCaps;

    // Extension support
    Extensions extensions;
};

}

#endif // LIBGLESV2_CAPS_H