Forums | NoesisGUI

struct DeviceCaps
{
    // Offset in pixel units from top-left corner to center of pixel
    float centerPixelOffset = 0.0f;

    // When this flag is enabled the device works in 'Linear' mode. All internal textures and
    // offscreens are created in 'sRGB' format. In this mode, the device also expects colors
    // (like the ones in the vertex buffer) in 'sRGB' format. It also indicates that the device
    // writes to the render target in linear space
    bool linearRendering = false;

    // This flag is enabled to indicate that the device supports LCD subpixel rendering. Extra
    // shaders and dual source blending are needed for this feature
    bool subpixelRendering = false;

    // Indicates whether the device clip space depth values range from 0 to 1
    bool depthRangeZeroToOne = true;

    // Whether the device clip space Y values are inverted (increase from top (-1) to bottom (1))
    bool clipSpaceYInverted = false;
};

bool depthRangeZeroToOne = true;
bool clipSpaceYInverted = false;

        /// <summary>Indicates whether the device clip space depth values range from 0 to 1</summary>
        [MarshalAs(UnmanagedType.U1)]
        public bool DepthRangeZeroToOne;

        /// <summary>Whether the device clip space Y values are inverted (increase from top (-1) to bottom (1))</summary>
        [MarshalAs(UnmanagedType.U1)]
        public bool ClipSpaceYInverted;

void VGLContext::SetViewport(const Rect& rect, bool flipY)
{
    mViewport = rect;
    mViewportFlipY = flipY;

    if (IsZero(rect.width) || IsZero(rect.height))
    {
        mBias = Matrix4::Identity();
    }
    else
    {
        float sx = 2.0f / rect.width;
        float sy = 2.0f / rect.height;

        float dx = -sx * rect.x - 1.0f;
        float dy = -sy * rect.y - 1.0f;
        float s = !mClipSpaceYInverted ? (flipY ? -1.0f : 1.0f) : (flipY ? 1.0f : -1.0f);

        float sz = mDepthRangeZeroToOne ? 1.0f : 2.0f;
        float dz = mDepthRangeZeroToOne ? 0.0f : -1.0f;

        mBias = Matrix4
        (
              sx,    0.0f, 0.0f, 0.0f,
            0.0f,  sy * s, 0.0f, 0.0f,
            0.0f,    0.0f,   sz, 0.0f,
              dx,  dy * s,   dz, 1.0f
        );
    }

    mVisibleBox = AABBox2(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
    mBiasHash = GetHashCode(mBias);

    if (mHasProjection)
    {
        mProjectionMatrixBias = mProjectionMatrix * mBias;
        mProjectionHash = GetHashCode(mProjectionMatrixBias);
    }
    else
    {
        mProjectionMatrixBias = mBias;
        mProjectionHash = mBiasHash;
    }
}