YiCapabilities.h

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// © You i Labs Inc. 2000-2017. All rights reserved.
#ifndef _YI_CAPABILITIES_H_
#define _YI_CAPABILITIES_H_

#include "framework/YiPredef.h"
#include "utility/YiString.h"

static const int32_t YI_MAX_GL_STRING_SIZE = 256;

struct SYI_CAPS
{
    SYI_CAPS() :
        bFrameBufferObjects(false),
        bStandardDerivatives(false),
        bCompressedEtc1RGB8Texture(false),
        bTextureFormatBGRA8888(false),
        bTextureNPOT(false),
        bMipmapNPOT(true),
        bMipmapNPOTWithGoodQuality(true),
        bDepthTextures(false),
        bPackedDepthStencil(false),
        nMaxTextureSize(0),
        nVertAttributes(0),
        nVertUniformVectors(0),
        nFragUniformVectors(0),
        nVaryingVectors(0),
        nCombinedTextureImageUnits(0),
        nVertTextureImageUnits(0),
        nFragTextureImageUnits(0),
        nSizeRedBits(0),
        nSizeGreenBits(0),
        nSizeBlueBits(0),
        nSizeAlphaBits(0),
        nSizeDepthBits(0),
        nSizeStencilBits(0)
    {}

    CYIString extensions;
    CYIString vendor;
    CYIString renderer;
    CYIString openglVersion;
    CYIString shadingLanguageVersion;

    bool bFrameBufferObjects; //True if FBOs are supported, false otherwise.
    bool bStandardDerivatives; //True if Standard Derivatives are supported, false otherwise.

    //Texture caps & limits
    bool bCompressedEtc1RGB8Texture; //implements GL_OES_compressed_ETC1_RGB8_texture extension.
    bool bTextureFormatBGRA8888; //implements GL_EXT_texture_format_BGRA8888 extension.
    bool bTextureNPOT; //implements GL_OES_texture_npot extension.
    bool bMipmapNPOT; //can use NPOT mipmaps.
    bool bMipmapNPOTWithGoodQuality; //generates proper NPOT mipmaps.
    bool bDepthTextures; //implements GL_OES_depth_texture extension
    bool bPackedDepthStencil; //implements GL_OES_packed_depth_stencil
    int32_t nMaxTextureSize; //this is a single value representing the largest square texture size.

    //Shader Limits
    int32_t nVertAttributes;
    int32_t nVertUniformVectors;
    int32_t nFragUniformVectors;
    int32_t nVaryingVectors;
    int32_t nCombinedTextureImageUnits;
    int32_t nVertTextureImageUnits;
    int32_t nFragTextureImageUnits;

    //General caps
    int32_t nSizeRedBits;
    int32_t nSizeGreenBits;
    int32_t nSizeBlueBits;
    int32_t nSizeAlphaBits;
    int32_t nSizeDepthBits;
    int32_t nSizeStencilBits;
};

class CYICapabilitiesPriv;

class CYICapabilities
{
public:
    CYICapabilities(void);
    virtual ~CYICapabilities(void);

    void InitCapabilities();
    const SYI_CAPS *GetDeviceCapabilities() const;
    const SYI_CAPS *GetAPICapabilities() const; //Minimum caps imposed by underlying rendering API spec.

    CYIString GetCapsReport() const;
    void LogCapsReport(const CYIString &filename) const;

private:
    CYICapabilitiesPriv *m_pPriv;

    YI_DISALLOW_COPY_AND_ASSIGN(CYICapabilities)
};

#endif // _YI_CAPABILITIES_H_