drawable_mesh_uniforms.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
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#ifndef VCL_BGFX_DRAWABLE_UNIFORMS_DRAWABLE_MESH_UNIFORMS_H
#define VCL_BGFX_DRAWABLE_UNIFORMS_DRAWABLE_MESH_UNIFORMS_H
 
#include <vclib/bgfx/uniform.h>
#include <vclib/mesh.h>
 
namespace vcl {
 
class DrawableMeshUniforms
{
    float mMeshColor[4] = {0.5, 0.5, 0.5, 1.0};
 
    float mMeshData[4] = {
        0.0, // as uint: first chunk primitive id drawn
        0.0,
        0.0,
        0.0};
 
    Uniform mMeshColorUniform = Uniform("u_meshColor", bgfx::UniformType::Vec4);
    Uniform mMeshDataUniform  = Uniform("u_meshData", bgfx::UniformType::Vec4);
 
public:
    DrawableMeshUniforms() = default;
 
    const float* currentMeshColor() const { return mMeshColor; }
 
    template<MeshConcept MeshType>
    void update(const MeshType& m)
    {
        if constexpr (HasColor<MeshType>) {
            mMeshColor[0] = m.color().redF();
            mMeshColor[1] = m.color().greenF();
            mMeshColor[2] = m.color().blueF();
            mMeshColor[3] = m.color().alphaF();
        }
    }
 
    void updateFirstChunkIndex(uint firstChunkIndex)
    {
        mMeshData[0] = Uniform::uintBitsToFloat(firstChunkIndex);
    }
 
    void bind() const
    {
        mMeshColorUniform.bind(mMeshColor);
        mMeshDataUniform.bind(mMeshData);
    }
};
 
} // namespace vcl
 
#endif // VCL_BGFX_DRAWABLE_UNIFORMS_DRAWABLE_MESH_UNIFORMS_H