viewer_drawer_uniforms.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2026                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
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 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_BGFX_DRAWERS_UNIFORMS_VIEWER_DRAWER_UNIFORMS_H
#define VCL_BGFX_DRAWERS_UNIFORMS_VIEWER_DRAWER_UNIFORMS_H
 
#include <vclib/bgfx/uniform.h>
#include <vclib/render/settings/pbr_viewer_settings.h>
 
namespace vcl {
 
class ViewerDrawerUniforms
{
    using enum PBRViewerSettings::ToneMapping;
 
    static inline std::array<float, 4> sData = {
        1.0,                             // exposure
        std::bit_cast<float>(ACES_HILL), // tone mapping
        0.0,                             // specular mip levels
        0.0                              // unused
    };
 
    static inline Uniform sDataUniform;
 
public:
    ViewerDrawerUniforms() = default;
 
    static void setExposure(float exposure) { sData[0] = exposure; }
 
    static void setToneMapping(PBRViewerSettings::ToneMapping tm)
    {
        sData[1] = std::bit_cast<float>(tm);
    }
 
    static void setSpecularMipsLevels(uint8_t specMips)
    {
        sData[2] = std::bit_cast<float>(uint(specMips));
    }
 
    static void bind()
    {
        // lazy initialization
        // to avoid creating uniforms before bgfx is initialized
        if (!sDataUniform.isValid())
            sDataUniform =
                Uniform("u_viewerSettingsPack", bgfx::UniformType::Vec4);
        sDataUniform.bind(sData.data());
    }
};
 
} // namespace vcl
 
#endif // VCL_BGFX_DRAWERS_UNIFORMS_VIEWER_DRAWER_UNIFORMS_H