Configuration parameters API

VGErrorCode vgConfigSetMZT(VGConfigMzt config,
                           VGfloat value);

VGfloat vgConfigGetMZT(VGConfigMzt config);

typedef enum {
    //
    // [READ-ONLY]
    //
    /*
        The maximum number of different threads that can "work"
        (e.g. create surfaces, draw paths, etc) concurrently.
    */
    VG_CONFIG_MAX_CURRENT_THREADS_MZT,
    /*
        The maximum dimension allowed for drawing surfaces, in pixels. This is
        the maximum valid value that can be specified as 'width' and 'height'
        for the vgPrivSurfaceCreateMZT and vgPrivSurfaceResizeMZT functions.
    */
    VG_CONFIG_MAX_SURFACE_DIMENSION_MZT,
    //
    //
    // [Geometry]
    //
    /*
        Used by AmanithVG geometric kernel to approximate curves with straight
        line segments (flattening). Valid range is [0; 100], where 100
        represents the best quality.
    */
    VG_CONFIG_CURVES_QUALITY_MZT,
    /*
        Used by radial gradient paints, only in non-shader pipelines
        (AmanithVG GLE only). Valid range is [0; 100], where 100 represents
        the best quality.
    */
    VG_CONFIG_RADIAL_GRADIENTS_QUALITY_MZT,
    /*
        Used by conical gradient paints, only in non-shader pipelines
        (AmanithVG GLE only). If VG_MZT_conical_gradient extension is not
        available, this parameter has no effects. Valid range is [0; 100]
        where 100 represents the best quality.
    */
    VG_CONFIG_CONICAL_GRADIENTS_QUALITY_MZT,
    //
    //
    // [Memory]
    //
    /*
        Number of OpenVG calls (handles creation / destruction and drawing
        functions) to be done before to recover / retrieve unused memory.
        Must be a positive number. If 0 is specified, unused memory will
        never be recovered from internal structures and memory pools.
    */
    VG_CONFIG_CALLS_BEFORE_MEMORY_RECOVERY_MZT,
    //
    //
    // [OpenGL] / [OpenGL ES] - AmanithVG GLE only
    //
    /*
        Avoid the use of GL_EXT_texture_rectangle or GL_ARB_texture_rectangle
        extension, even if supported by the GL Graphic System. Valid values
        are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_RECT_TEXTURES_DISABLED_MZT,
    /*
        Avoid the use of GL_ARB_texture_mirrored_repeat extension, even
        if supported by the GL Graphic System. Valid values are VG_FALSE
        and VG_TRUE
    */
    VG_CONFIG_FORCE_MIRRORED_REPEAT_DISABLED_MZT,
    /*
        Avoid the use of GL_ARB_texture_border_clamp extension, even
        if supported by the GL Graphic System. Valid values are VG_FALSE
        and VG_TRUE
    */
    VG_CONFIG_FORCE_CLAMP_TO_BORDER_DISABLED_MZT,
    /*
        Avoid the use of GL_EXT_blend_minmax extension, even if supported
        by the GL Graphic System. Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_BLEND_MIN_MAX_DISABLED_MZT,
    /*
        Avoid the use of GL_EXT_texture_env_dot3 or GL_ARB_texture_env_dot3 extension,
        even if supported by the GL Graphic System.
        WARNING: setting this parameter as true will compromise the correct
        drawing of images in stencil image mode.
        Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_DOT3_DISABLED_MZT,
    /*
        Avoid the use of Vertex Buffer Objects (VBO), even if supported by
        the GL Graphic System. Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_VBO_DISABLED_MZT,
    /*
        Force the maximum number of texture units that AmanithVG can use.
        Valid values are 1, 2, 3, 4 (AmanithVG uses no more than 4 texture
        units; at least 2 texture units are always required to implement the
        whole OpenVG features set).
    */
    VG_CONFIG_MAX_PERMITTED_TEXTURE_UNITS_MZT,
    /*
        Force the maximum texture size that AmanithVG can use.
        Valid values are 0 (autodetect), 64, 128, 256, 512, 1024, 2048,
        4096, 8192. Other values will be ignored.
    */
    VG_CONFIG_MAX_TEXTURE_SIZE_MZT,
    /*
        When both depth and stencil buffers are available on the GL
        context, it forces the specified buffer to be unused by AmanithVG.
        Valid values are defined by the VGBuffersDisabledMzt enum type.
        Other values will be ignored.
    */
    VG_CONFIG_FORCE_BUFFERS_DISABLED_MZT,
    /*
        Suppose depth and stencil buffers to be persistent after a swapBuffers
        call. Please note that, while on desktop platforms persistent buffers
        are common, the same is not so common on embedded (OpenGL ES) platforms.
        WARNING: setting this parameter as true on GL Graphic System with
        non-persistent buffers, will compromise a correct rendering on some specific
        OpenVG features.
        Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_SUPPOSE_PERSISTENT_BUFFERS_MZT,
    /*
        Avoid the use of GL scissor feature, even if supported by the GL
        Graphic System.
        WARNING: this parameter is provided to address compatibility
        issues; setting this parameter as true when the stencil buffer is
        not available to AmanithVG, will compromise a correct rendering on
        some specific OpenVG features. Furthermore it will have a negative
        impact on performance. Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_SCISSOR_DISABLED_MZT,
    /*
        Avoid the use of GL color masking feature, even if supported by the
        GL Graphic System.
        WARNING: this parameter is provided to address compatibility issues;
        setting this parameter as true will compromise a correct rendering
        on some specific OpenVG features. Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_COLOR_MASKING_DISABLED_MZT,
    /*
        Force the use of mipmaps on gradient textures.
        Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_MIPMAPS_ON_GRADIENTS_MZT,
    /*
        Force dithering on gradient textures, when the drawing surface is
        configured to have less than 8bit per color component (e.g.RGB565).
        Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_DITHERING_ON_GRADIENTS_MZT,
    /*
        Force dithering on image textures, when the drawing surface is
        configured to have less than 8bit per color component (e.g.RGB565).
        Valid values are VG_FALSE and VG_TRUE
    */
    VG_CONFIG_FORCE_DITHERING_ON_IMAGES_MZT,
    /*
        If VG_TRUE, it forces GL_RGBA texture format even for opaque
        paint / images. If VG_FALSE, GL_RGB texture format for opaque
        paint / images will be used.

    */
    VG_CONFIG_FORCE_RGBA_TEXTURES_MZT,
    /*
        If different than VG_FORCE_IMAGE_TEXTURE_BORDERS_NONE_MZT, it forces
        the upload of VGImage textures with an additional filled border. If
        VG_FORCE_IMAGE_TEXTURE_BORDERS_NONE_MZT, images are uploaded without
        additional borders.
        Negative values are treated as VG_FORCE_IMAGE_TEXTURE_BORDERS_WHOLE_MZT.
        WARNING: this parameter is provided to address compatibility issues
        related to u-v coordinates generation throught the GL_TEXTURE
        matrix, on not conformant GL Graphic System. By setting this parameter
        as VG_FORCE_IMAGE_TEXTURE_BORDERS_WHOLE_MZT or to a positive number, it
        will require additional memory and could impact on performance (when
        drawing images for the first time).
        Valid values are defined by the VGForceImageTextureBordersMzt enum type.
    */
    VG_CONFIG_FORCE_IMAGE_TEXTURE_BORDERS_MZT,
    /*
        In conjunction with VG_CONFIG_FORCE_IMAGE_TEXTURE_BORDERS_MZT
        parameter, it specifies how VGImage texture borders must be filled.
        If VG_TEXTURE_BORDER_MODE_CLEAR_MZT, borders are filled with a
        transparent black; if VG_TEXTURE_BORDER_MODE_COPY_MZT, borders are
        filled by duplicating pixels on image edges; if
        VG_TEXTURE_BORDER_MODE_COPY_ZERO_ALPHA_MZT, borders are filled by
        duplicating pixels on image edges and overriding their alpha value
        with 0.
        Valid values are defined by the VGImageTextureBordersModeMzt enum type.
    */
    VG_CONFIG_IMAGE_TEXTURE_BORDERS_MODE_MZT,
    /*
        Standard deviation factor for Gaussian blur filter. It represents
        the factor by which the sigma value is multiplied to obtain the
        amplitude (of the Gaussian function) to be taken for the blur.
        Must be a positive number. The default value of 3.0 guarantees a
        coverage of the Gaussian curve equal to 99.7%
    */
    VG_CONFIG_FILTER_GAUSSIAN_SIGMA_FACTOR_MZT
} VGConfigMzt;

typedef enum {
    // The defaul value (no buffers disabled).
    VG_BUFFERS_DISABLED_NONE_MZT,
    // When both depth and stencil buffers are available on the GL context, it
    // forces the depth buffer to be unused by AmanithVG GLE.
    VG_BUFFERS_DISABLED_DEPTH_MZT,
    // When both depth and stencil buffers are available on the GL context, it
    // forces the stencil buffer to be unused by AmanithVG GLE.
    VG_BUFFERS_DISABLED_STENCIL_MZT
} VGBuffersDisabledMzt;

typedef enum {
    VG_FORCE_IMAGE_TEXTURE_BORDERS_NONE_MZT,
    VG_FORCE_IMAGE_TEXTURE_BORDERS_WHOLE_MZT,
} VGForceImageTextureBordersMzt;

typedef enum {
    // Borders are filled with a transparent black.
    VG_TEXTURE_BORDER_MODE_CLEAR_MZT,
    // Borders are filled by duplicating pixels on image edges.
    VG_TEXTURE_BORDER_MODE_COPY_MZT,
    // Borders are filled by duplicating pixels on image edges and
    // overriding their alpha value with 0.
    VG_TEXTURE_BORDER_MODE_COPY_ZERO_ALPHA_MZT
} VGImageTextureBordersModeMzt;