Method UpdateShadowMapLitState

engine/PoseidonGL33/EngineGL33_Shaders.cpp:1032–1072

}

void EngineGL33::UpdateShadowMapLitState()
{
    // PS UBO: shadowCtl c2 {enable, 0, darkness, texelSize}; cascadeVP[4] c8-c23;
    // cascadeSplits c24 (per-tier select distance: a camera 3D radius for the first
    // omniCount omni tiers, a far eye-depth for frustum tiers); cascadeCtl c25
    // {count, fadeRange, biasBase, omniCount}; camFwd c26. Disabled default keeps
    // count 0 / darkness 1.0 (no change), so the gate is doubly safe.
    float ctl[4] = {0.0f, 0.0f, 1.0f, 0.0f};
    float splits[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    float cascadeCtl[4] = {0.0f, 0.0f, 0.0f, 0.0f};
    float camFwd[4] = {0.0f, 0.0f, 1.0f, 0.0f};
    if (_shadowTuning.enabled && _shadowMapActive && _shadowMapTex && _shadowCascades > 0)
    {
        ctl[0] = 1.0f; // enable the per-fragment shadow test
        // Lit-colour multiplier where shadowed, faded toward 1.0 (no shadow) as the
        // sun sets: full darkness in daylight, none at night. _shadowSunFactor is 1
        // by day, 0 at night (Scene drives it from the sun's NightEffect).
        ctl[2] = 1.0f - _shadowSunFactor * (1.0f - _shadowTuning.darkness);
        ctl[3] = (_shadowMapRes > 0) ? (1.0f / static_cast<float>(_shadowMapRes)) : 0.0f; // PCF texel size
        cascadeCtl[0] = static_cast<float>(_shadowCascades);
        cascadeCtl[1] = _shadowTuning.fadeRange;
        cascadeCtl[2] = _shadowTuning.biasBase;
        cascadeCtl[3] = static_cast<float>(_shadowOmniCount); // leading omni (distance-selected) tiers
        for (int i = 0; i < _shadowCascades && i < 4; i++)
        {
            splits[i] = _shadowSplits[i];
        }
        camFwd[0] = _shadowCamFwd[0];
        camFwd[1] = _shadowCamFwd[1];
        camFwd[2] = _shadowCamFwd[2];
        memcpy(s_psShadow + 8 * 4, _shadowMapVP, sizeof(float) * 16 * _shadowCascades);
        GL33Bind::ActiveUnit(2);
        glBindTexture(GL_TEXTURE_2D_ARRAY, _shadowMapTex);
        GL33Bind::ActiveUnit(0);
    }
    memcpy(s_psShadow + 2 * 4, ctl, 16);
    memcpy(s_psShadow + 24 * 4, splits, 16);
    memcpy(s_psShadow + 25 * 4, cascadeCtl, 16);
    memcpy(s_psShadow + 26 * 4, camFwd, 16);
    FlushPSConstants();
}

void EngineGL33::UploadVSViewConstants(const FrameState& frame)
{