Function screenSpaceQuad

src/render/RenderSystem.cpp:143–200

}

void screenSpaceQuad(float _textureWidth, float _textureHeight, float _width = 1.0f, float _height = 1.0f)
{
    if (bgfx::getAvailTransientVertexBuffer(3, Meshes::WorldStaticMeshVertex::ms_decl))
    {
        const bgfx::Caps* caps = bgfx::getCaps();
        const bgfx::RendererType::Enum renderer = bgfx::getRendererType();
        float _texelHalf = bgfx::RendererType::Direct3D9 == renderer ? 0.5f : 0.0f;

        bgfx::TransientVertexBuffer vb;
        bgfx::allocTransientVertexBuffer(&vb, 3, Meshes::WorldStaticMeshVertex::ms_decl);
        Meshes::WorldStaticMeshVertex* vertex = (Meshes::WorldStaticMeshVertex*)vb.data;

        const float minx = -_width;
        const float maxx = _width;
        const float miny = 0.0f;
        const float maxy = _height * 2.0f;

        const float texelHalfW = _texelHalf / _textureWidth;
        const float texelHalfH = _texelHalf / _textureHeight;
        const float minu = -1.0f + texelHalfW;
        const float maxu = 1.0f + texelHalfH;

        const float zz = 0.0f;

        float minv = texelHalfH;
        float maxv = 2.0f + texelHalfH;

        if (caps->originBottomLeft)
        {
            float temp = minv;
            minv = maxv;
            maxv = temp;

            minv -= 1.0f;
            maxv -= 1.0f;
        }

        vertex[0].Position.x = minx;
        vertex[0].Position.y = miny;
        vertex[0].Position.z = zz;
        vertex[0].TexCoord.x = minu;
        vertex[0].TexCoord.y = minv;

        vertex[1].Position.x = maxx;
        vertex[1].Position.y = miny;
        vertex[1].Position.z = zz;
        vertex[1].TexCoord.x = maxu;
        vertex[1].TexCoord.y = minv;

        vertex[2].Position.x = maxx;
        vertex[2].Position.y = maxy;
        vertex[2].Position.z = zz;
        vertex[2].TexCoord.x = maxu;
        vertex[2].TexCoord.y = maxv;

        bgfx::setVertexBuffer(0, &vb);
    }
}