GraphicsFoliage.cpp

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#include <array>
#include <cstdint>
#include "graphics/Graphics.h"
#include "graphics/Material.h"
#include "image/ImageData.h"
 
namespace eve::graphics {
Result<void> Graphics::configureFoliageWind(Material* material, float directionX, float directionZ, float strength,
                                            float bending, float bendingSpeed, float branch, float branchSpeed,
                                            float flutter, float flutterSpeed, float fadeDistance, float bendFactor) {
    if (!material)
        return Result<void>::failure(Diagnostic::error(DiagnosticCode::InvalidArgument, "null foliage material", {}, {},
                                                       "graphics.foliage.wind"));
    if (!foliageWindMotionTexture_) {
        std::array<uint16_t, 9 * 4> neutral{};
        for (size_t layer = 0; layer < 9; ++layer) {
            neutral[layer * 4]     = 0x3c00;  // 1.0
            neutral[layer * 4 + 2] = 0x3800;  // 0.5
        }
        auto uploaded = newTextureArrayRgba16f(1, 1, 9, neutral);
        if (!uploaded) return Result<void>::failure(uploaded.status());
        foliageWindMotionTexture_ = uploaded.value();
    }
    if (!foliageWindNoiseTexture_) {
        image::ImageData noise(4, 4, "RGBA8");
        for (int y = 0; y < 4; ++y) {
            for (int x = 0; x < 4; ++x) {
                const float value = float((x * 73 + y * 151 + x * y * 29 + 37) & 255) / 255.f;
                noise.setPixel(x, y, image::ImageData::Colorf{value, 1.f - value, .5f, 1.f});
            }
        }
        foliageWindNoiseTexture_ = newTextureFromImageData(&noise, true, true);
        if (!foliageWindNoiseTexture_)
            return Result<void>::failure(Diagnostic::error(DiagnosticCode::Failed, "foliage noise upload failed", {},
                                                           {}, "graphics.foliage.wind"));
    }
    return material->setFoliageWind(foliageWindMotionTexture_, foliageWindNoiseTexture_, directionX, directionZ,
                                    strength, bending, bendingSpeed, branch, branchSpeed, flutter, flutterSpeed,
                                    fadeDistance, bendFactor);
}
}  // namespace eve::graphics