PbrVariantPlan.h

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#pragma once
 
#include <array>
#include <cstdint>
#include <limits>
 
#include "common/Result.h"
#include "graphics/PbrSurface.h"
 
namespace eve::graphics::webgpu {
 
enum PbrFragmentResourceFlag : std::uint32_t {
    PbrEnvironment = 1u << 0,
    PbrShadows     = 1u << 1,
    PbrExtras      = 1u << 2,
    PbrColors      = 1u << 3,
    PbrFadeNoise   = 1u << 4,
};
 
enum PbrVertexResourceFlag : std::uint32_t {
    PbrVertexField = 1u << 0,
    PbrMotionField = 1u << 1,
    PbrMotionNoise = 1u << 2,
};
 
struct PbrVariantLimits {
    std::uint32_t sampledTexturesPerStage = 17;
    std::uint32_t samplersPerStage        = 16;
};
 
struct PbrVariantPlan {
    static constexpr std::uint32_t NoSampler = std::numeric_limits<std::uint32_t>::max();
 
    std::uint32_t canonicalTextureMask = 0;
    std::uint32_t detailTextureMask    = 0;
    std::uint32_t fragmentFlags        = 0;
    std::uint32_t vertexFlags          = 0;
    std::uint32_t fragmentTextures     = 0;
    std::uint32_t fragmentSamplers     = 0;
    std::uint32_t vertexTextures       = 0;
    std::uint32_t vertexSamplers       = 0;
    std::array<std::uint32_t, 11> canonicalSamplerRepresentatives{
        NoSampler, NoSampler, NoSampler, NoSampler, NoSampler, NoSampler,
        NoSampler, NoSampler, NoSampler, NoSampler, NoSampler};
    std::array<std::uint32_t, 3> detailSamplerRepresentatives{NoSampler, NoSampler, NoSampler};
 
    bool operator==(const PbrVariantPlan&) const = default;
};
 
[[nodiscard]] Result<PbrVariantPlan> planPbrVariant(const PbrSurface& surface, bool environment, bool shadows,
                                                    const PbrVariantLimits& limits = {});
 
}  // namespace eve::graphics::webgpu